static/style.css

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  --bg: #060b17;
  --text: #f4f7ff;
  --panel: #0b1328;
  --panel-alt: #101a33;
  --border: #1d2a44;
  --border-strong: #2d3d5f;
  --muted: #98a3b8;
  --muted-2: #667085;
  --surface: #081123;
  --accent: #2563ff;
  --accent-2: #6aa3ff;
  --success: #38d996;
  --success-bg: #0d3028;
  --key-next: #39ff7a;
  --key-next-2: #7dff9e;
  --brand-navy: #06122b;
  --brand-ink: #f7faff;
}

body.light {
  --bg: #f4f6fb;
  --text: #07142d;
  --panel: #ffffff;
  --panel-alt: #edf2fb;
  --border: #d8deea;
  --border-strong: #c2cbda;
  --muted: #626b7c;
  --muted-2: #8790a0;
  --surface: #f8faff;
  --accent: #2563ff;
  --accent-2: #4d83ff;
  --success: #16945f;
  --success-bg: #def7eb;
  --key-next: #22e062;
  --key-next-2: #5dff8c;
  --brand-navy: #06122b;
  --brand-ink: #07142d;
}

body {
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 92%, #10295f), var(--bg) 42%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: clip;
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .8rem 2rem;
  margin: -2rem calc(50% - 50vw) 1.5rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  box-shadow: 0 12px 34px rgba(0,0,0,.18);
}
header[hidden],
body.practice-mode #app-header,
body:has(#play-screen.active) #app-header {
  display: none !important;
}
.brand-home {
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 0;
  font: inherit;
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -.01em;
  cursor: pointer;
}
.brand-word > span { color: var(--accent); }
.brand-home:hover,
.brand-home:focus-visible { color: var(--accent); outline: none; }
.brand-mark {
  width: 2.35rem;
  height: 2.35rem;
  color: var(--accent);
  overflow: visible;
  flex: 0 0 auto;
}
.brand-mark-ring {
  fill: none;
  stroke: currentColor;
  stroke-width: 5;
  stroke-linecap: square;
  stroke-dasharray: 5 7;
  opacity: .92;
  transform-origin: 25px 38px;
  transform: rotate(-18deg);
}
.brand-mark-note {
  fill: var(--brand-ink);
  filter: drop-shadow(0 5px 10px rgba(0,0,0,.24));
}
body:not(.light) .brand-mark-note {
  fill: #f7faff;
}
.brand-mark-arrow {
  fill: var(--accent);
}
.midi-badge {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  border: 1px solid var(--border-strong);
  background: var(--panel);
  border-radius: 999px;
  padding: .35rem .75rem;
  font-size: .78rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.midi-badge-dot {
  width: .6rem;
  height: .6rem;
  border-radius: 50%;
  background: #888;
  box-shadow: 0 0 0 0 rgba(0,0,0,0);
  flex-shrink: 0;
}
.midi-badge-connected .midi-badge-dot {
  background: #22c55e;
  box-shadow: 0 0 6px rgba(34,197,94,.7);
}
.midi-badge-disconnected .midi-badge-dot {
  background: #ef4444;
}
.midi-badge-unsupported .midi-badge-dot {
  background: #888;
}

.theme-toggle {
  border: 1px solid var(--border-strong);
  background: var(--panel);
  color: var(--text);
  border-radius: 999px;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  line-height: 1;
  cursor: pointer;
}

.theme-icon {
  position: relative;
  width: 15px;
  height: 15px;
  display: inline-block;
  border-radius: 50%;
}

.theme-icon::before,
.theme-icon::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.theme-toggle[data-icon="sun"] .theme-icon {
  background: #fff;
  box-shadow:
    0 -8px 0 -6px #fff,
    0 8px 0 -6px #fff,
    8px 0 0 -6px #fff,
    -8px 0 0 -6px #fff,
    5.7px 5.7px 0 -6px #fff,
    -5.7px 5.7px 0 -6px #fff,
    5.7px -5.7px 0 -6px #fff,
    -5.7px -5.7px 0 -6px #fff;
}

.theme-toggle[data-icon="moon"] .theme-icon {
  background: #111318;
  border-radius: 50%;
  box-shadow: none;
}

.theme-toggle[data-icon="moon"] .theme-icon::after {
  inset: 0 0 0 5px;
  border-radius: 50%;
  background: var(--panel);
}

.top-nav-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: .75rem;
}

.nav-auth-user {
  align-items: center;
  gap: .65rem;
  color: var(--muted);
  font-size: .82rem;
  min-width: 0;
}

.nav-auth-user span {
  max-width: min(34vw, 260px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-logout-btn {
  padding: .38rem .72rem;
  border-radius: 999px;
  font-size: .78rem;
}

.nav-signin-btn,
.nav-library-btn {
  border-radius: 999px;
  padding: .48rem .9rem;
  font-size: .82rem;
}

.landing-page,
.library-page,
#auth-panel {
  display: none;
}

body.landing-route .landing-page,
body.library-route .library-page {
  display: block;
}

body.signin-route #auth-panel {
  display: grid;
}

.auth-panel {
  margin: 0 0 1.75rem;
}

body.auth-mode {
  height: 100vh;
  overflow: hidden;
}

body.auth-mode #list-screen {
  height: 100vh;
  max-width: none;
  box-sizing: border-box;
  overflow: hidden;
}

body.auth-mode #auth-panel {
  min-height: 0;
  height: calc(100vh - 7rem);
  margin: 0;
  display: grid !important;
  place-items: center;
  overflow: auto;
}

.auth-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  max-width: 520px;
}

body.auth-mode .auth-card {
  width: min(720px, calc(100vw - 3rem));
  max-width: none;
  border-radius: 14px;
  padding: 1.65rem 1.8rem 1.8rem;
  box-shadow: 0 24px 80px rgba(0,0,0,.26);
}

.auth-card h3 {
  font-size: 1rem;
  margin-bottom: .3rem;
}

body.auth-mode .auth-card h3 {
  font-size: 1.35rem;
}

.auth-copy {
  font-size: .82rem;
  color: var(--muted);
  line-height: 1.45;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  margin-top: .8rem;
}

.google-signin-btn {
  width: 100%;
  justify-content: center;
  gap: .6rem;
  border: 1px solid var(--border-strong);
  background: color-mix(in srgb, var(--surface) 88%, white 12%);
  color: var(--text);
}

.google-signin-btn:hover {
  border-color: var(--accent);
}

.google-signin-btn span {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: #2563ff;
  font-weight: 900;
  font-size: .8rem;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: .75rem;
  color: var(--muted);
  font-size: .74rem;
  text-transform: uppercase;
  letter-spacing: .12em;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  height: 1px;
  background: var(--border);
  flex: 1;
}

.auth-form input {
  width: 100%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: .7rem .8rem;
  font-size: .9rem;
}

body.auth-mode .auth-form input {
  padding: .95rem 1rem;
  font-size: 1rem;
}

.auth-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .65rem;
  align-items: stretch;
}

.auth-actions .btn {
  width: 100%;
  min-height: 42px;
  justify-content: center;
  white-space: normal;
  text-align: center;
}

.guest-signin-btn {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border-strong));
  color: var(--accent-2);
}

body.auth-mode .auth-actions .btn {
  padding: .72rem 1rem;
  font-size: .92rem;
}

@media (max-width: 620px) {
  .auth-actions {
    grid-template-columns: 1fr;
  }
}

.auth-status {
  min-height: 1.1rem;
  font-size: .8rem;
  color: var(--muted);
}

body.auth-mode .library-header,
body.auth-mode .score-grid-toolbar,
body.auth-mode .score-grid {
  display: none;
}

.landing-page {
  padding: clamp(2rem, 6vw, 5rem) 0 2rem;
}

.landing-hero {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(320px, .75fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  min-height: min(620px, calc(100vh - 10rem));
}

.landing-copy {
  max-width: 660px;
}

.landing-kicker {
  color: var(--accent-2);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.landing-kicker:empty {
  display: none;
}

.landing-copy h1 {
  font-size: clamp(3rem, 8vw, 6.8rem);
  line-height: 1.02;
  letter-spacing: 0;
  font-weight: 900;
  max-width: 800px;
}

.landing-copy > p:not(.landing-kicker) {
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.25rem);
  line-height: 1.55;
  margin-top: 1.25rem;
  max-width: 590px;
}

.landing-actions {
  display: flex;
  align-items: center;
  gap: .85rem;
  margin-top: 1.8rem;
  flex-wrap: wrap;
}

.landing-actions .btn {
  min-height: 46px;
  padding-inline: 1.15rem;
  border-radius: 999px;
}

.landing-score-preview {
  border: 1px solid var(--border);
  border-radius: 18px;
  background:
    radial-gradient(circle at 30% 15%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 38%),
    linear-gradient(180deg, color-mix(in srgb, var(--panel) 96%, white 4%), var(--surface));
  box-shadow: 0 24px 80px rgba(0,0,0,.28);
  padding: 1.1rem;
  min-height: 360px;
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 1rem;
  overflow: hidden;
}

.preview-staff {
  position: relative;
  min-height: 260px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  border: 1px solid var(--border);
  overflow: hidden;
}

.preview-staff span {
  position: absolute;
  left: 7%;
  right: 7%;
  height: 1px;
  background: color-mix(in srgb, var(--text) 46%, transparent);
}

.preview-staff span:nth-child(1) { top: 34%; }
.preview-staff span:nth-child(2) { top: 40%; }
.preview-staff span:nth-child(3) { top: 46%; }
.preview-staff span:nth-child(4) { top: 52%; }
.preview-staff span:nth-child(5) { top: 58%; }

.preview-staff i {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: 1.45rem;
  height: .95rem;
  border-radius: 50%;
  background: var(--text);
  transform: rotate(-16deg);
  box-shadow: 0 -3.1rem 0 -.18rem color-mix(in srgb, var(--text) 95%, transparent);
}

.preview-staff b {
  position: absolute;
  top: 22%;
  bottom: 22%;
  left: 63%;
  width: 3px;
  border-radius: 999px;
  background: var(--success);
  box-shadow: 0 0 22px color-mix(in srgb, var(--success) 65%, transparent);
}

.preview-keyboard {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: .35rem;
  height: 76px;
}

.preview-keyboard span {
  border-radius: 0 0 10px 10px;
  background: linear-gradient(180deg, #fff, #e8e5dc);
  border: 1px solid rgba(255,255,255,.18);
  box-shadow: inset 0 -10px 18px rgba(0,0,0,.12);
}

.preview-keyboard .active {
  background: linear-gradient(180deg, var(--key-next), color-mix(in srgb, var(--key-next) 72%, #0f8f45));
  box-shadow: 0 0 24px color-mix(in srgb, var(--key-next) 52%, transparent);
}

.landing-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.landing-feature-grid article {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--panel) 80%, transparent);
  padding: 1rem;
}

.landing-feature-grid h3 {
  font-size: .95rem;
  margin-bottom: .45rem;
}

.landing-feature-grid p {
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.5;
}

.landing-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  margin-top: 2rem;
  color: var(--muted);
  font-size: .82rem;
}

.github-footer-link {
  color: var(--text);
  width: 1.55rem;
  height: 1.55rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  opacity: .82;
  transition: color .15s ease, opacity .15s ease, transform .15s ease;
}

.github-footer-link svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

.github-footer-link:hover,
.github-footer-link:focus-visible {
  color: var(--accent);
  opacity: 1;
  transform: translateY(-1px);
  outline: none;
}

.guest-banner {
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 1.25rem;
  padding: .8rem .95rem;
  border: 1px solid color-mix(in srgb, var(--accent) 42%, var(--border));
  border-radius: 10px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 12%, transparent), transparent 55%),
    var(--panel);
  box-shadow: 0 14px 40px rgba(0,0,0,.16);
}

.guest-banner strong {
  display: block;
  font-size: .9rem;
}

.guest-banner span {
  display: block;
  margin-top: .15rem;
  color: var(--muted);
  font-size: .8rem;
}

.guest-banner-actions {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  flex-shrink: 0;
}

@media (max-width: 720px) {
  .guest-banner {
    align-items: flex-start;
    flex-direction: column;
  }
}

.modal-section h4 {
  font-size: .88rem;
  color: var(--text);
  margin-bottom: .25rem;
}

.modal-copy {
  font-size: .8rem;
  color: var(--muted);
  line-height: 1.45;
}

.upload-divider {
  height: 1px;
  background: var(--border);
  margin: 1rem 0;
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.upload-form input[type="text"],
.upload-form input[type="file"] {
  width: 100%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: .7rem .8rem;
  font-size: .9rem;
}

.file-input-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.file-dropzone {
  border: 1px dashed color-mix(in srgb, var(--border-strong) 85%, var(--accent));
  background: color-mix(in srgb, var(--surface) 88%, var(--accent) 12%);
  border-radius: 8px;
  padding: 1rem;
  cursor: pointer;
  transition: border-color .15s, background .15s, box-shadow .15s;
}

.file-dropzone:hover,
.file-dropzone:focus-visible,
.file-dropzone.drag-over {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--surface) 76%, var(--accent) 24%);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
  outline: none;
}

.file-dropzone-title {
  color: var(--text);
  font-weight: 800;
  font-size: .95rem;
}

.file-dropzone-copy,
.file-dropzone-selection {
  margin-top: .25rem;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.35;
}

.file-dropzone-selection {
  color: var(--text);
  font-weight: 900;
}

.upload-actions {
  display: flex;
  align-items: center;
  gap: .75rem;
  min-width: 0;
}

.import-status {
  display: block;
  margin-top: .55rem;
  font-size: .8rem;
  color: var(--muted);
}

.import-status[hidden] {
  display: none;
}

.import-progress {
  flex: 1;
  min-width: 12rem;
  display: grid;
  gap: .35rem;
  padding: .45rem .55rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface) 90%, var(--accent) 10%);
}

.import-progress[hidden] {
  display: none;
}

.import-progress-track {
  position: relative;
  height: .45rem;
  overflow: hidden;
  border-radius: 999px;
  background: color-mix(in srgb, var(--border) 70%, transparent);
}

.import-progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .25s ease;
}

.import-progress.active .import-progress-fill::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.32), transparent);
  animation: import-progress-sheen 1.15s linear infinite;
}

.import-progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  color: var(--muted);
  font-size: .76rem;
  font-weight: 900;
}

@keyframes import-progress-sheen {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

@media (max-width: 620px) {
  .upload-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .import-progress {
    min-width: 0;
  }
}

/* ── Screens ── */
.screen { display: none; padding: 2rem; max-width: 960px; margin: 0 auto; }
.screen.active { display: block; }
#list-screen { max-width: min(1180px, calc(100% - 2rem)); }
#play-screen { max-width: min(1800px, calc(100% - 2rem)); }
@media (min-width: 1400px) {
  #play-screen { padding: 2rem 3rem; }
}

/* ── Library header ── */
.library-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.25rem;
  margin: .2rem 0 1.35rem;
}

.library-header h2 {
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.04;
  letter-spacing: 0;
  font-weight: 900;
}

.library-header p {
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.45;
  margin-top: .7rem;
  max-width: 620px;
}

@media (max-width: 720px) {
  header {
    padding: .75rem 1rem;
  }
  .brand-home {
    font-size: 1.05rem;
  }
  .brand-mark {
    width: 2rem;
    height: 2rem;
  }
  .library-header {
    align-items: flex-start;
    flex-direction: column;
  }
  .top-nav-actions {
    gap: .5rem;
  }
  .nav-auth-user span {
    max-width: 34vw;
  }
  .landing-page {
    padding-top: 2rem;
  }
  .landing-hero {
    grid-template-columns: 1fr;
    min-height: 0;
  }
  .landing-score-preview {
    min-height: 280px;
  }
  .landing-feature-grid {
    grid-template-columns: 1fr;
  }
}

/* ── Score grid ── */
.score-grid {
  --score-grid-columns: 3;
  display: grid;
  grid-template-columns: repeat(var(--score-grid-columns), minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.score-grid-empty {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .85rem;
  padding: 4rem 1.5rem;
  text-align: center;
  color: var(--muted);
  border: 2px dashed var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--panel) 60%, transparent);
}
.score-grid-empty h3 {
  margin: 0;
  color: var(--text);
  font-size: 1.15rem;
}
.score-grid-empty p {
  margin: 0;
  font-size: .95rem;
}

.score-grid-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: .6rem;
  margin-top: .75rem;
}
.score-grid-toolbar label {
  font-size: .82rem;
  color: var(--muted);
}
.score-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: .9rem;
  transition: border-color .15s, transform .15s;
  cursor: pointer;
}
.score-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.score-card h3 { font-size: 1.05rem; margin-bottom: .4rem; }
.score-card small { color: var(--muted); font-size: .8rem; }
.score-card-meta {
  min-width: 0;
}
.score-card-skeleton {
  pointer-events: none;
}
.score-card-skeleton .score-preview,
.score-card-skeleton h3,
.score-card-skeleton small {
  position: relative;
  overflow: hidden;
}
.score-card-skeleton h3,
.score-card-skeleton small {
  display: block;
  border-radius: 999px;
  background: color-mix(in srgb, var(--muted-2) 18%, transparent);
}
.score-card-skeleton h3 {
  width: 72%;
  height: 1rem;
}
.score-card-skeleton small {
  width: 48%;
  height: .72rem;
}
.score-card-skeleton .score-preview::before,
.score-card-skeleton h3::before,
.score-card-skeleton small::before {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, color-mix(in srgb, white 14%, transparent), transparent);
  animation: score-skeleton-sheen 1.15s ease-in-out infinite;
}

@keyframes score-skeleton-sheen {
  to { transform: translateX(100%); }
}

.guest-demo-card {
  min-height: 300px;
  justify-content: space-between;
}

.guest-demo-card.primary {
  border-color: color-mix(in srgb, var(--accent) 58%, var(--border));
  box-shadow: 0 18px 50px rgba(37, 99, 255, .16);
}

.guest-demo-preview {
  min-height: 128px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background:
    radial-gradient(circle at 82% 20%, color-mix(in srgb, var(--accent) 35%, transparent), transparent 30%),
    linear-gradient(135deg, color-mix(in srgb, var(--surface) 92%, white 8%), var(--panel-alt));
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: .9rem;
  overflow: hidden;
}

.guest-demo-preview span,
.guest-demo-kicker {
  color: var(--accent-2);
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
}

.guest-demo-preview strong {
  color: var(--text);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: .9;
  letter-spacing: -.04em;
}

.guest-card-action {
  justify-content: center;
}
.score-preview {
  position: relative;
  aspect-ratio: 960 / 1240;
  overflow: hidden;
  border-radius: 8px;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  --preview-scale: 0.22;
}
.score-preview-frame {
  display: block;
  width: 960px;
  height: 1240px;
  border: none;
  background: #fff;
  transform: scale(var(--preview-scale));
  transform-origin: top left;
  pointer-events: none;
}
.score-preview.empty {
  display: flex;
  align-items: center;
  justify-content: center;
}
.score-preview-lite {
  display: grid;
  place-items: center;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--panel-alt) 92%, white 8%), var(--panel)),
    var(--panel-alt);
}
.score-preview-loading::after {
  content: "";
  position: absolute;
  right: .65rem;
  bottom: .65rem;
  width: .55rem;
  height: .55rem;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
  opacity: .76;
}
.score-preview-lines {
  position: absolute;
  inset: 20% 10%;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 13px,
    color-mix(in srgb, var(--muted-2) 34%, transparent) 14px,
    transparent 15px,
    transparent 28px
  );
  opacity: .55;
}
.score-preview-lite span {
  position: relative;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--accent) 18%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--border));
  color: var(--accent);
  font-weight: 800;
  font-size: 1.35rem;
}
.score-preview-empty {
  color: var(--muted-2);
  font-size: .85rem;
}
.score-card-actions {
  position: absolute;
  top: .55rem;
  right: .55rem;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: .25rem;
}
.delete-btn,
.rename-btn {
  flex-shrink: 0; background: color-mix(in srgb, var(--bg) 86%, transparent); border: none; color: var(--muted);
  font-size: 1rem; cursor: pointer; padding: .25rem .4rem; border-radius: 4px;
  transition: color .15s, background .15s;
}
.delete-btn:hover { color: #e05c5c; background: #2a1a1a; }
.rename-btn:hover { color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--bg)); }

@media (max-width: 1100px) {
  .score-grid {
    grid-template-columns: repeat(min(var(--score-grid-columns), 3), minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .score-grid {
    grid-template-columns: repeat(min(var(--score-grid-columns), 2), minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .score-grid {
    grid-template-columns: 1fr;
  }

  .score-grid-toolbar {
    justify-content: flex-start;
  }
}

/* ── Play screen ── */
#play-screen h2 { font-size: 1.1rem; color: #aaa; margin-bottom: 1.5rem; }

.play-shell {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.play-shell[data-sidebar="collapsed"] {
  grid-template-columns: 58px minmax(0, 1fr);
}

.play-content {
  min-width: 0;
}

.play-sidebar {
  position: sticky;
  top: 1.5rem;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1rem;
  max-height: calc(100vh - 3rem);
  overflow: hidden;
  transition: padding .14s ease, width .14s ease;
}

.play-sidebar-footer {
  margin-top: auto;
  padding-top: .75rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .65rem;
}

.sidebar-brand-home {
  min-width: 0;
  appearance: none;
  border: 0;
  box-shadow: none !important;
  background: transparent;
  color: var(--text);
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font: inherit;
  font-size: .92rem;
  font-weight: 850;
  letter-spacing: -.01em;
  cursor: pointer;
}

.sidebar-brand-dot {
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-navy), color-mix(in srgb, var(--accent) 55%, var(--brand-navy)));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .78rem;
  font-weight: 900;
  line-height: 1;
  box-shadow: 0 5px 14px color-mix(in srgb, var(--accent) 22%, transparent);
  flex: 0 0 auto;
}

.sidebar-brand-word {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-brand-word > span {
  color: var(--accent);
}

.sidebar-brand-home:hover,
.sidebar-brand-home:focus-visible {
  color: var(--accent);
  outline: none;
}

.sidebar-brand-home:focus-visible .sidebar-brand-dot {
  box-shadow:
    0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent),
    0 5px 14px color-mix(in srgb, var(--accent) 22%, transparent);
}

.sidebar-theme-toggle {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  padding: 0;
  font-size: .82rem;
}

.sidebar-footer-actions {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  flex: 0 0 auto;
}

.sidebar-account-menu {
  position: relative;
  flex: 0 0 auto;
}

.sidebar-account-btn {
  width: 30px;
  height: 30px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: color-mix(in srgb, var(--surface) 82%, var(--accent) 18%);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .72rem;
  font-weight: 850;
  cursor: pointer;
}

.sidebar-account-btn:hover,
.sidebar-account-btn:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.sidebar-account-popover {
  position: absolute;
  right: 0;
  bottom: calc(100% + .55rem);
  z-index: 20;
  width: 220px;
  padding: .85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: 0 18px 52px rgba(0,0,0,.35);
}

.sidebar-account-popover::after {
  content: "";
  position: absolute;
  right: 11px;
  bottom: -6px;
  width: 10px;
  height: 10px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transform: rotate(45deg);
}

.sidebar-account-eyebrow,
.sidebar-account-popover strong,
.sidebar-account-popover span {
  display: block;
}

.sidebar-account-eyebrow {
  color: var(--accent-2);
  font-size: .66rem;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: .35rem;
}

.sidebar-account-popover strong {
  color: var(--text);
  font-size: .86rem;
  line-height: 1.25;
  word-break: break-word;
}

.sidebar-account-popover #sidebar-account-detail {
  margin-top: .25rem;
  color: var(--muted);
  font-size: .74rem;
  line-height: 1.35;
}

.sidebar-account-popover .btn {
  width: 100%;
  justify-content: center;
  margin-top: .75rem;
  padding: .42rem .6rem;
  font-size: .74rem;
}

.play-sidebar-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .6rem;
  margin-bottom: .9rem;
}

.play-sidebar-copy {
  min-width: 0;
  flex: 1;
}

.play-sidebar-header h3 {
  font-size: .92rem;
  color: var(--text);
  margin-bottom: .3rem;
}

.play-sidebar-header p {
  font-size: .76rem;
  color: var(--muted);
  line-height: 1.45;
}

.play-sidebar-toggle {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: .95rem;
  line-height: 1;
  transition: border-color .12s ease, color .12s ease, background .12s ease;
}

.play-sidebar-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.play-piece-list {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  max-height: calc(100vh - 8rem);
  overflow: auto;
  padding-right: .2rem;
}

.play-guest-banner {
  margin-top: .75rem;
  padding: .75rem;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
}

.play-guest-banner strong,
.play-guest-banner span {
  display: block;
}

.play-guest-banner strong {
  font-size: .78rem;
}

.play-guest-banner span {
  margin-top: .2rem;
  color: var(--muted);
  font-size: .72rem;
  line-height: 1.35;
}

.play-guest-banner div {
  display: grid;
  grid-template-columns: 1fr;
  gap: .45rem;
  margin-top: .65rem;
}

.play-guest-banner .btn {
  width: 100%;
  justify-content: center;
  padding: .42rem .55rem;
  font-size: .72rem;
}

.play-piece-item {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: .7rem .8rem;
  cursor: pointer;
  transition: border-color .12s ease, background .12s ease, transform .12s ease;
}

.play-piece-item:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
}

.play-piece-item.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--surface));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 18%, transparent);
}

.play-piece-item:disabled {
  cursor: default;
  opacity: 1;
}

.play-piece-title {
  display: block;
  font-size: .86rem;
  font-weight: 700;
  color: var(--text);
}

.play-piece-slug {
  display: block;
  margin-top: .2rem;
  font-size: .72rem;
  color: var(--muted);
  word-break: break-word;
}

.play-shell[data-sidebar="collapsed"] .play-sidebar {
  padding: .75rem .45rem;
}

.play-shell[data-sidebar="collapsed"] .play-sidebar-header {
  margin-bottom: 0;
  justify-content: center;
}

.play-shell[data-sidebar="collapsed"] .play-sidebar-copy,
.play-shell[data-sidebar="collapsed"] .play-piece-list,
.play-shell[data-sidebar="collapsed"] .play-guest-banner,
.play-shell[data-sidebar="collapsed"] .sidebar-brand-word,
.play-shell[data-sidebar="collapsed"] .sidebar-footer-actions,
.play-shell[data-sidebar="collapsed"] .sidebar-theme-toggle {
  display: none;
}

.play-shell[data-sidebar="collapsed"] .play-sidebar-footer {
  justify-content: center;
  border-top: 0;
  padding-top: .75rem;
}

.play-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.play-bottom {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
  align-items: stretch;
}

.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.controls-top {
  width: min(430px, 100%);
  margin-left: auto;
}

/* BPM + controls */
.controls { background: var(--panel); border-radius: 10px; padding: 1.25rem; }
.controls label { font-size: .85rem; color: var(--muted); display: block; margin-bottom: .4rem; }
.tempo-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.bpm-row { display: flex; align-items: center; gap: .75rem; }
.tempo-actions {
  display: flex;
  align-items: center;
  gap: .6rem;
  flex-shrink: 0;
}
.latency-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: .75rem;
  margin-top: .85rem;
}
.latency-row label {
  margin: 0;
  white-space: nowrap;
}
.latency-row input[type="range"] {
  width: 100%;
}
.latency-row span {
  font-size: .82rem;
  color: var(--muted);
  min-width: 58px;
  text-align: right;
}
.bpm-row input {
  width: 90px; padding: .45rem .7rem; border-radius: 6px;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text);
  font-size: 1rem;
}
.btn {
  padding: .5rem 1.2rem; border-radius: 6px; border: none;
  font-size: .9rem; font-weight: 600; cursor: pointer; transition: opacity .15s;
}
.btn:hover { opacity: .85; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-danger  { background: #e05c5c; color: #fff; }
.btn-ghost   { background: var(--border); color: var(--text); }

/* Status panel */
.status-panel {
  background: var(--panel);
  border-radius: 10px;
  padding: 1.25rem;
  height: 100%;
}
.status-row { display: flex; justify-content: space-between; margin-bottom: .6rem; font-size: .85rem; color: var(--muted); }
.status-val { color: var(--text); font-weight: 600; }
#next-note-display {
  font-size: 3rem; font-weight: 700; text-align: center;
  color: var(--accent); margin-top: .5rem; letter-spacing: .05em;
}

/* ── Input mode ── */
.input-mode-section {
  background: var(--panel); border-radius: 10px; padding: 1.25rem; margin-top: 1rem; margin-bottom: 1.5rem;
}
.input-mode-section h4 {
  font-size: .85rem;
  color: var(--muted);
  margin-bottom: .75rem;
}
.input-mode-tabs { display: flex; gap: .5rem; margin-bottom: .75rem; }
.mode-tab {
  padding: .4rem 1rem; border-radius: 6px; border: 1px solid var(--border-strong);
  background: var(--surface); color: var(--muted); font-size: .85rem; cursor: pointer; transition: all .15s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .35rem;
}
.mode-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.beta-badge {
  border: 1px solid color-mix(in srgb, currentColor 42%, transparent);
  border-radius: 999px;
  padding: .08rem .32rem;
  font-size: .58rem;
  line-height: 1.1;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .04em;
  opacity: .82;
}
.mic-row { display: flex; align-items: center; gap: .6rem; }
.mic-status-text {
  font-size: .85rem;
  color: var(--muted);
}
.mic-note-display {
  margin-left: auto;
  color: var(--accent);
  font-size: .85rem;
  font-weight: 700;
  min-width: 4rem;
  text-align: right;
}
.mic-device-row,
.mic-gate-row {
  margin-top: .65rem;
}
.mic-device-row label,
.mic-gate-row label {
  width: 92px;
  color: var(--muted);
  font-size: .8rem;
  flex-shrink: 0;
}
.mic-device-row select,
.mic-gate-row input {
  flex: 1;
  min-width: 0;
}
.mic-gate-row span {
  width: 36px;
  color: var(--muted);
  font-size: .8rem;
  text-align: right;
}
.mic-status-dot {
  width: 10px; height: 10px; border-radius: 50%; background: #333; flex-shrink: 0;
  transition: background .2s;
}
.mic-status-dot.active  { background: #5aaa60; box-shadow: 0 0 6px #5aaa60; }
.mic-status-dot.hearing { background: #7c6af7; box-shadow: 0 0 8px #7c6af7; }

.level-meter-wrap { width: 100%; }
.mic-calibration-meter { margin-top: .75rem; }
.level-meter-track {
  position: relative; width: 100%; height: 28px;
  background: var(--surface); border-radius: 6px; overflow: visible;
  border: 1px solid var(--border);
}
.level-meter-fill {
  position: absolute; left: 0; top: 0; height: 100%;
  width: 0%; border-radius: 6px;
  background: linear-gradient(to right, #2a7a35, #5aaa60);
  transition: width 0.04s linear;
}
.level-meter-fill.active {
  background: linear-gradient(to right, #5040b0, #7c6af7);
}
.level-meter-peak {
  position: absolute; top: 4px; width: 3px; height: 20px;
  background: #fff; border-radius: 2px; opacity: 0.7;
  transition: left 0.05s;
}
.level-meter-gate {
  position: absolute; top: 0; width: 2px; height: 100%;
  background: #e05c5c;
}
.level-gate-label {
  position: absolute; top: 50%; transform: translateY(-50%);
  font-size: 10px; color: #e05c5c; white-space: nowrap; pointer-events: none;
}

.mic-calibration-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .55rem;
  margin-top: .8rem;
  padding: .75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
}
.mic-latency-btn {
  min-width: 0;
}
.mic-latency-round,
.mic-latency-prompt,
.mic-latency-result,
.mic-latency-samples {
  grid-column: 1 / -1;
}
.mic-latency-round {
  color: var(--muted);
  font-size: .72rem;
  min-height: 1rem;
}
.mic-latency-prompt {
  display: grid;
  place-items: center;
  min-height: 72px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  text-align: center;
}
.mic-latency-result {
  min-height: 1.2rem;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.35;
}
.mic-latency-samples {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  min-height: 1.6rem;
}
.mic-latency-sample {
  display: inline-flex;
  align-items: center;
  min-height: 1.45rem;
  padding: .16rem .42rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: .7rem;
  white-space: nowrap;
}
.mic-latency-sample.good {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.mic-follower-panel {
  margin-top: .75rem;
  padding: .75rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
}
.mic-follower-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .45rem;
}
.mic-follower-stats span {
  min-width: 0;
  padding: .45rem .5rem;
  border-radius: 8px;
  background: var(--panel);
  border: 1px solid var(--border);
}
.mic-follower-stats b {
  display: block;
  color: var(--muted);
  font-size: .62rem;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.mic-follower-stats strong {
  display: block;
  margin-top: .18rem;
  color: var(--text);
  font-size: .82rem;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mic-chroma-strip {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: .25rem;
  height: 48px;
  margin-top: .65rem;
  align-items: end;
}
.mic-chroma-cell {
  position: relative;
  display: flex;
  align-items: end;
  justify-content: center;
  height: 100%;
  min-width: 0;
  border-radius: 7px;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--border);
}
.mic-chroma-cell span {
  width: 100%;
  min-height: 2px;
  border-radius: 7px 7px 0 0;
  background: linear-gradient(180deg, var(--accent), color-mix(in srgb, var(--accent) 54%, transparent));
}
.mic-chroma-cell em {
  position: absolute;
  bottom: 3px;
  left: 0;
  right: 0;
  color: var(--muted);
  font-size: .55rem;
  font-style: normal;
  text-align: center;
}
.mic-candidates {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  min-height: 1.4rem;
  margin-top: .6rem;
  color: var(--muted);
  font-size: .72rem;
  line-height: 1.35;
}
.mic-candidates span {
  display: flex;
  justify-content: space-between;
  gap: .5rem;
}
.mic-candidates strong { color: var(--text); }

/* Keyboard viz */
.play-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  align-items: start;
}
@media (min-width: 1500px) {
  .play-main {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .play-main .keyboard-section,
  .play-main .sheet-section {
    margin-bottom: 0;
  }
}
.keyboard-section { background: var(--panel); border-radius: 10px; padding: 1.25rem; margin-bottom: 1.5rem; }
.mini-keyboard-panel {
  display: block;
}
.keyboard-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .55rem;
  margin-bottom: .75rem;
}
.keyboard-heading-main {
  display: flex;
  align-items: center;
  gap: .55rem;
}
.keyboard-section h4 { font-size: .85rem; color: var(--muted); margin-bottom: 0; }
.keyboard-view-toggle {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .2rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
}
.keyboard-view-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: .74rem;
  font-weight: 700;
  padding: .32rem .8rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background .12s ease, color .12s ease;
}
.keyboard-view-btn.active {
  background: var(--accent);
  color: #fff;
}
.keyboard-view-btn:hover:not(.active) {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--text);
}
.help-tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--muted);
  font-size: .72rem;
  font-weight: 700;
  cursor: help;
}
.help-tip-popup {
  position: absolute;
  left: 50%;
  top: calc(100% + 10px);
  transform: translateX(-50%);
  width: max-content;
  max-width: 260px;
  padding: .6rem .75rem;
  border-radius: 8px;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: .76rem;
  line-height: 1.45;
  box-shadow: 0 10px 24px rgba(0,0,0,.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity .12s ease;
  z-index: 20;
  white-space: normal;
}
.help-tip:hover .help-tip-popup,
.help-tip:focus .help-tip-popup,
.help-tip:focus-within .help-tip-popup {
  opacity: 1;
}
.piano-stage {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: linear-gradient(to bottom, color-mix(in srgb, var(--panel-alt) 60%, transparent), var(--panel));
  overflow: hidden;
}

.keyboard-loading {
  position: absolute;
  inset: 0;
  z-index: 8;
  place-items: center;
  background:
    radial-gradient(ellipse at 50% 65%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 48%),
    color-mix(in srgb, var(--panel) 86%, transparent);
  color: var(--muted);
  font-size: .92rem;
  font-weight: 750;
  letter-spacing: .01em;
}
.keyboard-loading.error {
  color: #f0c35a;
}
.note-highway {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: .2rem;
  height: 210px;
  padding: .65rem .65rem 0;
  background:
    radial-gradient(ellipse at 50% 105%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 42%),
    linear-gradient(to bottom, color-mix(in srgb, var(--panel-alt) 95%, var(--accent) 5%), color-mix(in srgb, var(--surface) 84%, #000 16%)),
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent 31px,
      color-mix(in srgb, var(--border) 42%, transparent) 32px
    );
  border-bottom: 1px solid var(--border);
  box-shadow: inset 0 16px 32px rgba(0,0,0,.18);
  isolation: isolate;
}
.note-highway::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(to right, color-mix(in srgb, var(--accent) 10%, transparent), transparent 14%, transparent 86%, color-mix(in srgb, var(--accent) 10%, transparent)),
    linear-gradient(to bottom, rgba(255,255,255,.06), transparent 24%, transparent 72%, rgba(255,255,255,.05));
  opacity: .75;
  z-index: 0;
}
.note-lane {
  position: relative;
  z-index: 1;
  border-left: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  border-right: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: linear-gradient(to bottom, transparent, color-mix(in srgb, var(--surface) 35%, transparent));
}
.note-lane.black {
  background: linear-gradient(to bottom, color-mix(in srgb, var(--panel-alt) 92%, transparent), color-mix(in srgb, var(--panel-alt) 65%, transparent));
}
.note-lane-label {
  position: absolute;
  top: .35rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: .68rem;
  font-weight: 700;
  color: var(--muted);
  pointer-events: none;
  white-space: nowrap;
}
.note-hit-line {
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 6px;
  height: 4px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--accent) 68%, white);
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 32%, transparent);
  z-index: 2;
}
.note-bar {
  position: absolute;
  z-index: 3;
  left: 8px;
  right: 8px;
  border-radius: 6px;
  background: linear-gradient(to bottom, color-mix(in srgb, var(--accent) 88%, white), var(--accent));
  border: 1px solid color-mix(in srgb, var(--accent) 52%, white);
  box-shadow: 0 6px 14px color-mix(in srgb, var(--accent) 28%, transparent);
}
.note-bar.current {
  background: linear-gradient(to bottom, color-mix(in srgb, var(--success) 90%, white), var(--success));
  border-color: color-mix(in srgb, var(--success) 55%, white);
  box-shadow: 0 6px 16px color-mix(in srgb, var(--success) 30%, transparent);
}
.kb-layout {
  padding: 0 .65rem .65rem;
}
.kb-layout.hidden,
.reference-keyboard-panel.hidden,
.mini-keyboard-panel.hidden {
  display: none;
}
.keyboard-section[data-layout-mode="full"] .mini-keyboard-panel {
  display: none !important;
}
.keyboard-section[data-layout-mode="mini"] .reference-keyboard-panel {
  display: none !important;
}
.kb-row {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: .3rem;
  align-items: end;
}
.kb-key-wrap {
  position: relative;
  min-width: 0;
  padding-top: 0;
}
.kb-key {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 120px;
  border-radius: 0 0 10px 10px;
  background: linear-gradient(to bottom, #fffefb, #ebe6d9);
  border: 1px solid color-mix(in srgb, var(--border-strong) 90%, #fff);
  font-size: .75rem;
  line-height: 1.3;
  transition: background .1s, border-color .1s;
  user-select: none;
  padding-top: 1.8rem;
  color: #1b1b20;
  cursor: pointer;
}
.kb-key-white {
  height: 120px;
  border-radius: 0 0 10px 10px;
  background: linear-gradient(to bottom, #fffefb, #ebe6d9);
  border: 1px solid color-mix(in srgb, var(--border-strong) 90%, #fff);
  color: #1b1b20;
}
.kb-key .key-char { font-weight: 700; font-size: .9rem; }
.kb-key .note-name { color: #6f6b62; font-size: .65rem; }
.kb-key-black {
  position: absolute;
  top: 0;
  right: -22%;
  width: 58%;
  height: 78px;
  border-radius: 0 0 8px 8px;
  background: linear-gradient(to bottom, #343642, #0f1015);
  border: 1px solid #0a0b10;
  color: #fff;
  padding-top: 1rem;
  z-index: 3;
}
.kb-key-black .note-name { color: #b6bbc8; }
.kb-key-black.active { background: linear-gradient(to bottom, color-mix(in srgb, var(--accent) 70%, #fff), var(--accent)); border-color: var(--accent-2); }
.kb-key-black.next { background: linear-gradient(to bottom, var(--key-next-2), var(--key-next)); border-color: var(--key-next); box-shadow: 0 0 14px color-mix(in srgb, var(--key-next) 65%, transparent), 0 0 28px color-mix(in srgb, var(--key-next) 35%, transparent); color: #052a10; }
.kb-key-white.active { background: linear-gradient(to bottom, color-mix(in srgb, var(--accent) 28%, white), color-mix(in srgb, var(--accent) 18%, #ebe6d9)); border-color: var(--accent-2); }
.kb-key-white.next { background: linear-gradient(to bottom, var(--key-next-2), var(--key-next)); border-color: var(--key-next); box-shadow: 0 0 14px color-mix(in srgb, var(--key-next) 65%, transparent), 0 0 28px color-mix(in srgb, var(--key-next) 35%, transparent); color: #052a10; }
.reference-keyboard-panel {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}
.full-note-highway {
  position: relative;
  height: 210px;
  margin-bottom: .7rem;
  border-radius: 10px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 50% 105%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 40%),
    linear-gradient(to bottom, color-mix(in srgb, var(--panel-alt) 96%, var(--accent) 4%), color-mix(in srgb, var(--surface) 82%, #000 18%)),
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent 31px,
      color-mix(in srgb, var(--border) 38%, transparent) 32px
    ),
    repeating-linear-gradient(
      to right,
      color-mix(in srgb, var(--border) 42%, transparent) 0,
      color-mix(in srgb, var(--border) 42%, transparent) 1px,
      transparent 1px,
      transparent calc(100% / 52)
    );
  border: 1px solid var(--border);
  box-shadow: inset 0 16px 34px rgba(0,0,0,.2);
}
.full-note-highway::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(to right, color-mix(in srgb, var(--accent) 10%, transparent), transparent 12%, transparent 88%, color-mix(in srgb, var(--accent) 10%, transparent)),
    linear-gradient(to bottom, rgba(255,255,255,.06), transparent 25%, transparent 72%, rgba(255,255,255,.05));
  opacity: .72;
}
.full-note-hit-line {
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 8px;
  height: 4px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--accent) 68%, white);
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 32%, transparent);
  z-index: 2;
}
.full-note-bar {
  position: absolute;
  z-index: 3;
  border-radius: 6px;
  background: linear-gradient(to bottom, color-mix(in srgb, var(--accent) 88%, white), var(--accent));
  border: 1px solid color-mix(in srgb, var(--accent) 52%, white);
  box-shadow: 0 6px 14px color-mix(in srgb, var(--accent) 28%, transparent);
}
.full-note-bar.current {
  background: linear-gradient(to bottom, color-mix(in srgb, var(--success) 90%, white), var(--success));
  border-color: color-mix(in srgb, var(--success) 55%, white);
  box-shadow: 0 6px 16px color-mix(in srgb, var(--success) 30%, transparent);
}
.reference-keyboard-shell {
  overflow: hidden;
  padding: .25rem 0 .15rem;
}
.reference-keyboard {
  --ref-white-width: calc(100% / 52);
  --ref-black-width: calc(var(--ref-white-width) * 0.62);
  --ref-black-offset: calc(var(--ref-black-width) / 2);
  width: 100%;
  min-width: 0;
  height: 174px;
  position: relative;
  border-radius: 12px;
  background: linear-gradient(to bottom, color-mix(in srgb, var(--surface) 92%, #fff), color-mix(in srgb, var(--surface) 88%, #000));
  border: 1px solid var(--border-strong);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.03), 0 10px 24px rgba(0,0,0,.08);
}
.reference-whites {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: stretch;
}
.reference-blacks {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.ref-key {
  box-sizing: border-box;
  user-select: none;
  cursor: pointer;
  transition: background .12s ease, border-color .12s ease, box-shadow .12s ease, transform .12s ease;
}
.ref-key-black { pointer-events: auto; }
.ref-key-note {
  display: block;
  white-space: nowrap;
  letter-spacing: -.01em;
}
.ref-key-white {
  width: var(--ref-white-width);
  min-width: var(--ref-white-width);
  height: 100%;
  border-right: 1px solid color-mix(in srgb, var(--border-strong) 88%, #fff);
  border-bottom-left-radius: 8px;
  border-bottom-right-radius: 8px;
  background: linear-gradient(to bottom, #fffefb, #e7e1d4);
  color: #20232b;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0 1px .55rem;
  font-size: .46rem;
  text-align: center;
  overflow: hidden;
}
.ref-key-white .ref-key-note {
  color: #656458;
  transform: scale(.96);
  transform-origin: center bottom;
}
.ref-key-black {
  position: absolute;
  top: 0;
  width: var(--ref-black-width);
  height: 108px;
  border-radius: 0 0 6px 6px;
  background: linear-gradient(to bottom, #383b46, #11131a);
  border: 1px solid #090a0f;
  color: #f4f6fb;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0 0 .42rem;
  font-size: .38rem;
  text-align: center;
  z-index: 4;
  box-shadow: 0 4px 12px rgba(0,0,0,.38);
  overflow: hidden;
}
.ref-key-black .ref-key-note {
  color: #c6cad7;
  transform: scale(.96);
  transform-origin: center bottom;
}
.ref-key-white.active {
  background: linear-gradient(to bottom, color-mix(in srgb, var(--accent) 28%, white), color-mix(in srgb, var(--accent) 18%, #ebe6d9));
  border-color: var(--accent-2);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent-2) 35%, transparent);
}
.ref-key-white.next {
  background: linear-gradient(to bottom, var(--key-next-2), var(--key-next));
  border-color: var(--key-next);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--key-next) 50%, transparent),
              0 0 14px color-mix(in srgb, var(--key-next) 65%, transparent),
              0 0 28px color-mix(in srgb, var(--key-next) 35%, transparent);
  color: #052a10;
}
.ref-key-black.active {
  background: linear-gradient(to bottom, color-mix(in srgb, var(--accent) 70%, #fff), var(--accent));
  border-color: var(--accent-2);
  box-shadow: 0 6px 14px color-mix(in srgb, var(--accent) 26%, transparent);
}
.ref-key-black.next {
  background: linear-gradient(to bottom, var(--key-next-2), var(--key-next));
  border-color: var(--key-next);
  box-shadow: 0 0 14px color-mix(in srgb, var(--key-next) 65%, transparent),
              0 0 28px color-mix(in srgb, var(--key-next) 40%, transparent);
  color: #052a10;
}

/* Part picker */
.part-picker {
  background: var(--panel);
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 0;
  height: 100%;
}
.part-picker h4 { font-size: .85rem; color: var(--muted); margin-bottom: .75rem; }
.part-buttons { display: flex; flex-direction: column; gap: .5rem; }
.part-row { display: flex; align-items: center; gap: .5rem; }
.part-btn {
  padding: .45rem 1rem; border-radius: 6px; border: 1px solid var(--border-strong);
  background: var(--surface); color: var(--muted); font-size: .85rem; cursor: pointer;
  transition: all .15s;
  display: flex;
  align-items: center;
}
.part-btn:hover { border-color: var(--accent); color: var(--text); }
.part-btn.selected { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

.part-name {
  min-width: 0;
  overflow-wrap: anywhere;
}

.instr-select {
  padding: .35rem .6rem; border-radius: 6px; border: 1px solid var(--border-strong);
  background: var(--surface); color: var(--muted); font-size: .8rem; cursor: pointer;
}
.instr-select:focus { outline: none; border-color: var(--accent); }

/* Progress bar */
.progress-bar { background: var(--border); border-radius: 99px; height: 6px; margin-bottom: 1.5rem; overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); border-radius: 99px; transition: width .3s; }

/* Sheet music */
.sheet-section { background: var(--panel); border-radius: 10px; overflow: hidden; }
.sheet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .55rem 1rem .55rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.sheet-title-row {
  display: flex;
  align-items: center;
  gap: .65rem;
}
.sheet-section h4 { font-size: .85rem; color: var(--muted); padding: 0; border: none; }
.sheet-status-badge {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: .22rem .55rem;
  font-size: .72rem;
  color: var(--muted);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  white-space: nowrap;
}
.sheet-status-badge[data-state="ok"] {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border-strong));
}
.sheet-status-badge[data-state="warning"] {
  color: #f0c35a;
  border-color: rgba(240, 195, 90, .35);
  background: rgba(184, 128, 0, .12);
}
.sheet-toolbar {
  display: flex;
  align-items: center;
  gap: .3rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.sheet-fingering-progress {
  padding: .75rem 1.25rem .2rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
  background: color-mix(in srgb, var(--panel) 92%, var(--surface));
}
.sheet-fingering-progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  margin-bottom: .45rem;
  font-size: .78rem;
  color: var(--muted);
}
.sheet-fingering-progress-bar {
  height: 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--border) 78%, transparent);
  overflow: hidden;
}
.sheet-fingering-progress-fill {
  width: 0%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 82%, white), var(--accent));
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 28%, transparent);
  transition: width .28s cubic-bezier(.22, 1, .36, 1);
}
.sheet-action-btn {
  background: var(--panel-alt);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: .32rem .7rem;
  font-size: .76rem;
  cursor: pointer;
  line-height: 1;
  white-space: nowrap;
}
.sheet-action-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}
.sheet-action-btn[data-active="true"] {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}
.sheet-action-btn:disabled {
  opacity: .5;
  cursor: default;
}
.sheet-display-toggle {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .18rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}
.sheet-display-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: .28rem .62rem;
  font-size: .74rem;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
}
.sheet-display-btn.active {
  background: var(--accent);
  color: #fff;
}
.sheet-display-btn:hover:not(.active) {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.sheet-tool-btn {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: .25rem .55rem;
  font-size: .85rem;
  cursor: pointer;
  line-height: 1;
  min-width: 28px;
}
.sheet-tool-btn:hover { border-color: var(--accent); color: var(--accent); }
.sheet-zoom-label {
  font-size: .78rem;
  color: var(--muted);
  min-width: 3.1rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.sheet-viewer {
  position: relative;
  width: 100%;
  height: 500px;
  overflow: auto;
  scrollbar-gutter: stable both-edges;
  background: var(--panel-alt);
}
.sheet-content-wrap {
  transform-origin: top left;
  transition: transform .18s ease;
  width: 100%;
  padding-right: .65rem;
  padding-bottom: .65rem;
}
#sheet-frame { width: 100%; height: 500px; border: none; display: block; background: #fff; }
.sheet-placeholder { padding: 2rem; text-align: center; color: var(--muted-2); font-size: .9rem; }
.sheet-musicxml-fallback {
  display: none;
  min-height: 500px;
  padding: 1rem;
  background: #181824;
  color: #f2efe8;
  border-radius: 0;
  overflow: visible;
}
.sheet-musicxml-fallback[data-theme="light"],
body.light .sheet-musicxml-fallback {
  background: #fff;
  color: #111318;
}
.sheet-musicxml-fallback[data-theme="dark"],
body:not(.light) .sheet-musicxml-fallback {
  background: #181824;
  color: #f2efe8;
}
.sheet-musicxml-fallback svg {
  color: currentColor !important;
}
.sheet-musicxml-fallback[data-theme="dark"] svg :is(path, ellipse, polygon, polyline, line, text, tspan, use):not(.accompy-measure-highlight),
body:not(.light) .sheet-musicxml-fallback svg :is(path, ellipse, polygon, polyline, line, text, tspan, use):not(.accompy-measure-highlight) {
  fill: #f2efe8 !important;
  stroke: #f2efe8 !important;
}
.sheet-musicxml-fallback[data-theme="dark"] svg rect:not(.accompy-measure-highlight),
body:not(.light) .sheet-musicxml-fallback svg rect:not(.accompy-measure-highlight) {
  fill: #f2efe8 !important;
  stroke: #f2efe8 !important;
}
.sheet-musicxml-fallback[data-theme="dark"] svg [fill="none"],
body:not(.light) .sheet-musicxml-fallback svg [fill="none"] {
  fill: none !important;
}
.sheet-musicxml-fallback[data-theme="dark"] svg [stroke="none"],
body:not(.light) .sheet-musicxml-fallback svg [stroke="none"] {
  stroke: none !important;
}
.sheet-musicxml-fallback[data-theme="dark"] svg rect[fill="white"],
.sheet-musicxml-fallback[data-theme="dark"] svg rect[fill="#ffffff"],
.sheet-musicxml-fallback[data-theme="dark"] svg rect[fill="#FFF"],
.sheet-musicxml-fallback[data-theme="dark"] svg rect[fill="#fff"],
body:not(.light) .sheet-musicxml-fallback svg rect[fill="white"],
body:not(.light) .sheet-musicxml-fallback svg rect[fill="#ffffff"],
body:not(.light) .sheet-musicxml-fallback svg rect[fill="#FFF"],
body:not(.light) .sheet-musicxml-fallback svg rect[fill="#fff"] {
  fill: #181824 !important;
  stroke: #181824 !important;
}

/* Back button row */
.top-row { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; }
.top-row h2 { margin: 0; }

@media (max-width: 900px) {
  .play-shell {
    grid-template-columns: 1fr;
  }

  .play-sidebar {
    position: static;
    max-height: none;
  }

  .play-piece-list {
    max-height: 220px;
  }

  .play-header,
  .play-bottom {
    grid-template-columns: 1fr;
    display: grid;
  }

  .tempo-row {
    flex-direction: column;
    align-items: stretch;
  }

  .tempo-actions {
    justify-content: flex-start;
  }

  .latency-row {
    grid-template-columns: 1fr;
  }

  .latency-row span {
    text-align: left;
  }

  .keyboard-heading {
    flex-direction: column;
    align-items: flex-start;
  }

}

/* ── Practice workspace refactor ── */
#play-screen {
  height: calc(100vh - 70px);
  overflow: hidden;
}

body.practice-mode #play-screen {
  height: 100vh;
  max-width: 100%;
  padding: 1rem;
}

body:has(#play-screen.active) #play-screen {
  height: 100vh;
  max-width: 100%;
  padding: .25rem;
}

#play-screen h2 {
  margin: 0;
  color: var(--text);
}

.play-shell {
  grid-template-columns: 260px 12px minmax(0, 1fr);
  column-gap: .5rem;
  row-gap: 1rem;
  align-items: stretch;
  height: 100%;
  min-height: 0;
}

.play-shell[data-sidebar="collapsed"] {
  grid-template-columns: 58px 12px minmax(0, 1fr);
}

.play-sidebar {
  position: relative;
  top: auto;
  height: 100%;
  max-height: none;
  border-radius: 8px;
}

.play-piece-list {
  max-height: none;
  min-height: 0;
}

.play-content {
  display: grid;
  grid-template-rows: 4px minmax(0, 1fr);
  gap: .35rem;
  min-height: 0;
}

.progress-bar {
  margin-bottom: 0;
  height: 5px;
}

.practice-area {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 12px 320px;
  column-gap: .5rem;
  row-gap: 1rem;
  min-height: 0;
  overflow: hidden;
}

.layout-splitter {
  position: relative;
  min-width: 12px;
  cursor: col-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
}

.layout-splitter::before {
  content: "";
  position: absolute;
  top: .5rem;
  bottom: .5rem;
  left: 50%;
  width: 1px;
  background: var(--border);
}

.layout-splitter span {
  position: relative;
  width: 5px;
  height: 54px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--border-strong) 82%, var(--surface));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--surface) 75%, transparent);
}

.layout-splitter:hover span,
.layout-splitter:focus-visible span,
body.layout-resizing .layout-splitter span {
  background: color-mix(in srgb, var(--accent) 72%, white);
}

body.layout-resizing {
  cursor: col-resize;
  user-select: none;
}

.practice-workspace {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr) 12px minmax(0, 1fr);
  gap: 0;
}

.practice-area .sheet-section {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.sheet-header {
  flex-shrink: 0;
}

.sheet-viewer {
  flex: 1;
  min-height: 0;
  height: auto;
}

.sheet-content-wrap {
  height: 100%;
  min-height: 100%;
}

#sheet-frame {
  display: block;
  height: 100%;
  min-height: 0;
}

.sheet-musicxml-fallback {
  height: 100%;
  min-height: 100%;
  overflow: auto;
}

.practice-splitter {
  position: relative;
  min-height: 12px;
  cursor: row-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
}

.practice-splitter::before {
  content: "";
  position: absolute;
  left: .5rem;
  right: .5rem;
  top: 50%;
  height: 1px;
  background: var(--border);
}

.practice-splitter span {
  position: relative;
  width: 54px;
  height: 5px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--border-strong) 82%, var(--surface));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--surface) 75%, transparent);
}

.practice-splitter:hover span,
.practice-splitter:focus-visible span,
body.practice-resizing .practice-splitter span {
  background: color-mix(in srgb, var(--accent) 72%, white);
}

body.practice-resizing {
  cursor: row-resize;
  user-select: none;
}

.practice-panel {
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  overflow: auto;
  scrollbar-gutter: stable;
  padding-right: .65rem;
  margin-right: -.65rem;
}

.practice-card {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  padding: .9rem;
}

.practice-card h4,
.practice-card h5 {
  margin: 0 0 .75rem;
  font-size: .78rem;
  color: var(--muted);
  letter-spacing: 0;
}

.practice-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  margin-bottom: .75rem;
}

.practice-card-header h4 {
  margin: 0;
}

.guest-tips-card ul {
  display: grid;
  gap: .55rem;
  list-style: none;
}

.guest-tips-card li {
  position: relative;
  padding-left: 1rem;
  color: var(--text);
  font-size: .82rem;
  line-height: 1.4;
}

.guest-tips-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .48rem;
  width: .38rem;
  height: .38rem;
  border-radius: 50%;
  background: var(--accent);
}

.guest-annotation-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .45rem;
  margin-top: .8rem;
}

.guest-annotation-actions .btn {
  justify-content: center;
  padding: .46rem .55rem;
  font-size: .72rem;
}

.guest-annotation-list {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-top: .65rem;
}

.guest-annotation-list span,
.guest-annotation-list small {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  padding: .28rem .48rem;
  font-size: .7rem;
}

.practice-pill {
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: .18rem .55rem;
  color: var(--muted);
  font-size: .72rem;
  background: var(--surface);
}

.next-note-card {
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--border));
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  padding: .85rem;
  text-align: center;
  margin-bottom: .75rem;
}

.next-note-card > span {
  display: block;
  color: var(--muted);
  font-size: .76rem;
  margin-bottom: .35rem;
}

.practice-panel .status-panel {
  background: transparent;
  border-radius: 0;
  padding: 0;
  height: auto;
}

.practice-panel .status-row {
  margin-bottom: .55rem;
}

.practice-panel .status-row:last-child {
  margin-bottom: 0;
}

#next-note-display {
  margin-top: 0;
  font-size: 2.55rem;
  line-height: 1;
}

.upgrade-toast {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 80;
  width: min(360px, calc(100vw - 2rem));
  border: 1px solid color-mix(in srgb, var(--accent) 42%, var(--border));
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  padding: 1rem;
  box-shadow: 0 24px 80px rgba(0,0,0,.34);
}

.upgrade-toast strong {
  display: block;
  font-size: .98rem;
  margin-bottom: .35rem;
}

.upgrade-toast p {
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.45;
  padding-right: 1.25rem;
}

.upgrade-toast-actions {
  display: flex;
  gap: .55rem;
  margin-top: .85rem;
}

.upgrade-toast-close {
  position: absolute;
  top: .55rem;
  right: .55rem;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: .85rem;
}

.setup-control-block {
  display: grid;
  gap: .35rem;
  margin-bottom: .75rem;
}

.setup-control-block label,
.setup-card .latency-row label {
  color: var(--muted);
  font-size: .76rem;
  font-weight: 700;
}

.setup-control-block .bpm-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: .5rem;
}

.setup-control-block .bpm-row input {
  width: 100%;
  min-width: 0;
}

.setup-control-block .bpm-row span,
.setup-card .latency-row span {
  color: var(--muted);
  font-size: .76rem;
}

.setup-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .5rem;
  margin: 0 0 .8rem;
}

.setup-actions .btn {
  justify-content: center;
}

.setup-card .latency-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 42px;
  align-items: center;
  gap: .5rem;
  margin: 0 0 .85rem;
}

.adaptive-tempo-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  margin: 0 0 .9rem;
  padding: .65rem .7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
}

.adaptive-tempo-label {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
}

.setup-card {
  overflow: visible;
  position: relative;
  z-index: 5;
}

.adaptive-tempo-row .help-tip-popup,
.follow-mode-row .help-tip-popup {
  left: 0;
  right: auto;
  top: calc(100% + 8px);
  transform: none;
  width: 230px;
  max-width: min(230px, calc(100vw - 3rem));
  z-index: 80;
}

.switch-toggle {
  position: relative;
  width: 42px;
  height: 24px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  cursor: pointer;
  transition: background .16s ease, border-color .16s ease;
}

.switch-toggle span {
  position: absolute;
  left: 3px;
  top: 3px;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: var(--muted);
  transition: transform .16s ease, background .16s ease;
}

.switch-toggle.active {
  background: color-mix(in srgb, var(--accent) 28%, var(--surface));
  border-color: var(--accent);
}

.switch-toggle.active span {
  transform: translateX(18px);
  background: var(--accent);
}

.mixer-controls,
.output-controls {
  display: grid;
  gap: .5rem;
  margin: 0 0 .9rem;
  padding: .7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
}

.mixer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
}

.mixer-row,
.output-row {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr) 42px;
  align-items: center;
  gap: .55rem;
  margin: 0;
  color: var(--muted);
  font-size: .78rem;
}

.output-row {
  grid-template-columns: 104px minmax(0, 1fr);
}

.output-routing-status {
  min-height: 1rem;
  color: var(--muted);
  font-size: .72rem;
  line-height: 1.3;
}

.mixer-row input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.mixer-row strong {
  color: var(--text);
  font-size: .76rem;
  text-align: right;
}

.setup-card .part-picker,
.input-mode-section {
  margin: 0;
  height: auto;
  background: transparent;
  border-radius: 0;
  padding: 0;
}

.setup-card .part-picker h5 {
  margin-bottom: .55rem;
}

.part-buttons {
  gap: .45rem;
}

.part-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(110px, .8fr);
}

.part-btn {
  width: 100%;
  text-align: left;
}

.accompaniment-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  margin-top: .75rem;
  padding-top: .75rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .8rem;
}

.accompaniment-row strong {
  color: var(--text);
  font-size: .8rem;
}

.practice-panel .input-mode-section h4 {
  margin-bottom: .65rem;
}

.practice-panel .input-mode-tabs {
  margin-bottom: .65rem;
}

.practice-panel .mode-tab {
  flex: 1;
  padding: .42rem .55rem;
  white-space: nowrap;
}

.keyboard-section {
  min-height: 0;
  margin-bottom: 0;
  padding: .55rem .7rem .7rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.keyboard-heading {
  flex-shrink: 0;
  margin-bottom: .5rem;
  gap: .6rem;
}

.keyboard-section h4 {
  font-size: .78rem;
}

.keyboard-view-toggle {
  flex-wrap: wrap;
}

.keyboard-view-btn {
  white-space: nowrap;
}

.piano-stage {
  position: relative;
  border-radius: 8px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.mini-keyboard-panel {
  min-height: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.note-highway {
  height: 110px;
  min-height: 80px;
  flex: 1;
}

.kb-layout {
  padding: .5rem;
  flex-shrink: 0;
}

.kb-key {
  height: 92px;
  padding-top: 1.25rem;
}

.kb-key-white {
  height: 92px;
}

.kb-key-black {
  height: 58px;
  padding-top: .65rem;
}

.reference-keyboard-panel {
  margin-top: 0;
  padding: 0;
  border-top: 0;
  min-height: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.full-note-highway {
  flex: 1;
  min-height: 72px;
  margin-bottom: .55rem;
}

.reference-keyboard-shell {
  flex-shrink: 0;
  height: clamp(72px, 18vh, 118px);
  padding: 0;
}

.reference-keyboard {
  height: 100%;
  border-radius: 8px;
}

.ref-key-white {
  padding-bottom: .2rem;
  font-size: 0;
}

.ref-key-black {
  height: 58%;
  padding-bottom: .12rem;
  font-size: 0;
}

@media (max-width: 1180px) {
  #play-screen {
    height: auto;
    overflow: visible;
  }

  .play-shell {
    grid-template-columns: 220px 12px minmax(0, 1fr);
    align-items: start;
  }

  .practice-area {
    grid-template-columns: 1fr !important;
  }

  .panel-splitter {
    display: none;
  }

  .practice-panel {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    padding-right: 0;
    margin-right: 0;
  }
}

@media (max-width: 900px) {
  .play-shell,
  .play-shell[data-sidebar="collapsed"] {
    grid-template-columns: 1fr !important;
    height: auto;
  }

  .shell-splitter {
    display: none;
  }

  .practice-workspace {
    grid-template-rows: minmax(420px, 1fr) 12px minmax(260px, .7fr);
  }

  .practice-panel {
    grid-template-columns: 1fr;
  }

  #sheet-frame,
  .sheet-musicxml-fallback {
    min-height: 100%;
  }

  .setup-card .latency-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .setup-card .latency-row span {
    text-align: left;
  }
}

/* ── Modal ── */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,.65);
  display: flex; align-items: center; justify-content: center; z-index: 100;
}
.modal {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  width: min(600px, 94vw); max-height: 80vh; display: flex; flex-direction: column;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.25rem; border-bottom: 1px solid #2a2a38;
}
.modal-header h3 { font-size: 1rem; }
.modal-close {
  background: none; border: none; color: #aaa; font-size: 1.1rem;
  cursor: pointer; padding: .2rem .5rem; border-radius: 4px;
}
.modal-close:hover { background: #2a2a38; }
.modal-body { padding: 1rem 1.25rem; overflow-y: auto; }
.confirm-modal { max-width: 420px; }
.confirm-modal-message { margin: 0 0 1.25rem; color: var(--text); font-size: .95rem; line-height: 1.45; }
.confirm-modal-actions { display: flex; justify-content: flex-end; gap: .6rem; }

.search-row {
  display: flex; align-items: center; gap: .5rem; margin-bottom: .75rem;
}
.search-row input {
  flex: 1; padding: .55rem .9rem; border-radius: 8px;
  border: 1px solid #3a3a50; background: #0f0f13; color: #e8e8f0;
  font-size: .95rem;
}
.search-hint { color: #555; font-size: .85rem; text-align: center; padding: 1rem 0; }

.search-results { display: flex; flex-direction: column; gap: .4rem; }
.result-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: .6rem .85rem; background: #0f0f13; border-radius: 8px;
  border: 1px solid #2a2a38;
}
.result-item .result-info { min-width: 0; }
.result-item .result-path { font-size: .8rem; color: #888; margin-top: .15rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.result-item .result-name { font-size: .9rem; font-weight: 500; }
.result-item .btn { flex-shrink: 0; font-size: .8rem; padding: .35rem .8rem; }
.result-item.adding { opacity: .6; pointer-events: none; }
.result-item.done { border-color: #5aaa60; }

/* Responsive */
@media (max-width: 640px) {
  .play-top { grid-template-columns: 1fr; }
}