@import "tailwindcss";
@layer base, components, utilities;


/* ── Font: Heming (self-hosted variable monospace) ──────────── */
@font-face {
  font-family: "Heming";
  src: url("/fonts/Heming-Variable.woff2") format("woff2-variations"),
       url("/fonts/Heming-Variable.ttf") format("truetype-variations");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* ── Font & Typography Declarations (Claude lookalike) ────── */
:root {
  --font-serif-claude: var(--font-newsreader), "Newsreader", "Source Serif 4", "Charter", "Merriweather", Georgia, serif;
  --font-sans-claude: var(--font-sans), "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --font-mono-claude: var(--font-mono), "JetBrains Mono", monospace;
}

/* ── Theme: Dark (Claude Warm Dark: Deep Charcoal & Terracotta) ─ */
:root,
[data-theme="dark"] {
  --bg-base:        #1A1917;  /* Warm charcoal */
  --bg-surface:     #22211E;
  --bg-card:        #2A2925;
  --bg-card-hover:  #33312C;
  --border:         #3A3832;
  --border-light:   #494740;

  --accent-1:       #D97757;  /* Claude signature terracotta */
  --accent-2:       #E0886A;
  --accent-hover:   #C86A4C;
  --accent-success: #48BB78;
  --accent-warn:    #ED8936;
  --accent-danger:  #F56565;

  --text-primary:   #F5F4EE;  /* Warm ivory */
  --text-secondary: #B8B4A8;  /* Muted warm stone */
  --text-muted:     #827E74;

  --btn-primary-bg:   #D97757;
  --btn-primary-text: #FFFFFF;
  --btn-success-text: #FFFFFF;
  --badge-bg-alpha:   0.12;
  --diagram-bg:       #1A1917;

  --badge-blue-bg:    rgba(217, 119, 87, 0.12);
  --badge-blue-text:  #E0886A;
  --badge-green-bg:   rgba(72, 187, 120, 0.12);
  --badge-green-text: #48BB78;
  --badge-red-bg:     rgba(245, 101, 101, 0.12);
  --badge-red-text:   #F56565;

  --feedback-error-bg:    rgba(245, 101, 101, 0.08);
  --feedback-error-border:rgba(245, 101, 101, 0.25);
  --feedback-success-bg:  rgba(72, 187, 120, 0.08);
  --feedback-success-border: rgba(72, 187, 120, 0.25);
  --feedback-info-bg:     rgba(217, 119, 87, 0.06);
  --feedback-info-border: rgba(217, 119, 87, 0.2);

  --mcq-hover-bg:     rgba(255, 255, 255, 0.03);
  --mcq-correct-bg:   rgba(72, 187, 120, 0.1);
  --mcq-correct-border: rgba(72, 187, 120, 0.35);
  --mcq-wrong-bg:     rgba(245, 101, 101, 0.1);
  --mcq-wrong-border: rgba(245, 101, 101, 0.35);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

/* ── Theme: Light (Claude Warm Ivory Parchment & Terracotta) ── */
[data-theme="light"] {
  --bg-base:        #FAF9F5;  /* Claude signature warm cream paper */
  --bg-surface:     #F3F1EC;
  --bg-card:        #FFFFFF;
  --bg-card-hover:  #F7F5F0;
  --border:         #E8E5DE;
  --border-light:   #DFDBD2;

  --accent-1:       #D97757;  /* Claude terracotta */
  --accent-2:       #C86A4C;
  --accent-hover:   #BA5C3E;
  --accent-success: #2F855A;
  --accent-warn:    #DD6B20;
  --accent-danger:  #C53030;

  --text-primary:   #2C2825;  /* Warm charcoal */
  --text-secondary: #615C55;  /* Warm muted stone */
  --text-muted:     #8F8A81;

  --btn-primary-bg:   #D97757;
  --btn-primary-text: #FFFFFF;
  --btn-success-text: #FFFFFF;
  --badge-bg-alpha:   0.08;
  --diagram-bg:       #F3F1EC;

  --badge-blue-bg:    rgba(217, 119, 87, 0.08);
  --badge-blue-text:  #C86A4C;
  --badge-green-bg:   rgba(47, 133, 90, 0.08);
  --badge-green-text: #2F855A;
  --badge-red-bg:     rgba(197, 48, 48, 0.08);
  --badge-red-text:   #C53030;

  --feedback-error-bg:    rgba(197, 48, 48, 0.05);
  --feedback-error-border:rgba(197, 48, 48, 0.2);
  --feedback-success-bg:  rgba(47, 133, 90, 0.05);
  --feedback-success-border: rgba(47, 133, 90, 0.2);
  --feedback-info-bg:     rgba(217, 119, 87, 0.04);
  --feedback-info-border: rgba(217, 119, 87, 0.15);

  --mcq-hover-bg:     rgba(0, 0, 0, 0.02);
  --mcq-correct-bg:   rgba(47, 133, 90, 0.06);
  --mcq-correct-border: rgba(47, 133, 90, 0.25);
  --mcq-wrong-bg:     rgba(197, 48, 48, 0.06);
  --mcq-wrong-border: rgba(197, 48, 48, 0.25);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --card-shadow: 0 2px 14px rgba(44, 40, 37, 0.08), 0 1px 3px rgba(44, 40, 37, 0.04);
}

/* ── Base Reset ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

@layer base {
  body {
    background: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-sans-claude);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.65;
    letter-spacing: -0.01em;
  }
}

/* ── Theme transition for all elements ─────────────────────── */
*, *::before, *::after {
  transition-property: background-color, border-color, color, box-shadow;
  transition-duration: 0.15s;
  transition-timing-function: ease;
}
/* Exclude elements that shouldn't transition (spinners, animations) */
.spinner, .fade-up, .progress-bar-fill {
  transition: none;
}

/* ── Typography (Claude Editorial Serif for Headings) ─────── */
h1 {
  font-family: var(--font-serif-claude);
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

h2 {
  font-family: var(--font-serif-claude);
  font-size: 1.65rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

h3 {
  font-family: var(--font-serif-claude);
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

p, li { color: var(--text-secondary); }

/* ── Gradient Text ─────────────────────────────────────────── */
.grad-text {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Badge-New ─────────────────────────────────────────────── */
.badge-new {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.badge-new-pill {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.65rem;
  text-transform: uppercase;
}

/* ── Terminal Component ────────────────────────────────────── */
.terminal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--card-shadow);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.terminal:focus-within {
  border-color: var(--accent-1);
}
.terminal-header {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  padding: 0 1.25rem;
  border-bottom: 1px solid var(--border);
  height: 42px;
  background: var(--bg-surface);
}
.terminal-tab {
  height: 100%;
  display: flex;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: inherit;
  cursor: pointer;
  position: relative;
  transition: color 0.15s ease;
  letter-spacing: 0.02em;
  text-transform: capitalize;
}
.terminal-tab:hover {
  color: var(--text-primary);
}
.terminal-tab.active {
  color: var(--text-primary);
  font-weight: 600;
}
.terminal-tab.active::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-1);
  border-radius: 2px 2px 0 0;
}
.terminal-content {
  padding: 1.25rem;
  min-height: 120px;
}
.terminal-body {
  padding: 1rem 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 80px;
  background: var(--bg-card);
}
.terminal-prompt {
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.85rem;
  width: 100%;
}
.terminal-input {
  background: transparent;
  border: none;
  font-family: inherit;
  color: var(--text-primary);
  outline: none;
  flex: 1;
  font-size: 0.95rem;
}
.terminal-input::placeholder {
  color: var(--text-muted);
}

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}
.card:hover { border-color: var(--border-light); background: var(--bg-card-hover); }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn:hover  { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}
.btn-primary:hover { opacity: 0.9; }

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--text-primary); }

/* ── Inputs ────────────────────────────────────────────────── */
.input {
  width: 100%;
  background: var(--bg-base);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  outline: none;
  transition: border-color 0.15s ease;
}
.input:focus { border-color: var(--text-muted); }
.input::placeholder { color: var(--text-muted); }

.textarea {
  width: 100%;
  background: var(--bg-base);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.75rem;
  outline: none;
  resize: vertical;
  line-height: 1.6;
  transition: border-color 0.15s ease;
}
.textarea:focus { border-color: var(--text-muted); }
.textarea::placeholder { color: var(--text-muted); }

.input-terminal {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1.1rem;
  outline: none;
  padding: 0.5rem 0;
}
.input-terminal::placeholder { color: var(--text-muted); }

/* ── Labels ────────────────────────────────────────────────── */
.form-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Feedback Box ──────────────────────────────────────────── */
.feedback-box {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  line-height: 1.55;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  background: var(--bg-base);
}
.feedback-box.error {
  background: var(--feedback-error-bg);
  border-color: var(--feedback-error-border);
  color: var(--accent-danger);
}
.feedback-box.success {
  background: var(--feedback-success-bg);
  border-color: var(--feedback-success-border);
  color: var(--accent-success);
}
.feedback-box.info {
  background: var(--feedback-info-bg);
  border-color: var(--feedback-info-border);
  color: var(--text-secondary);
}

/* ── Badge ─────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  background: var(--border);
  color: var(--text-secondary);
}
.badge-blue {
  background: var(--badge-blue-bg);
  color: var(--badge-blue-text);
}
.badge-green {
  background: var(--badge-green-bg);
  color: var(--badge-green-text);
}
.badge-red {
  background: var(--badge-red-bg);
  color: var(--badge-red-text);
}

/* ── MCQ Options ───────────────────────────────────────────── */
.mcq-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.825rem;
  cursor: pointer;
  margin-bottom: 0.4rem;
  transition: all 0.15s ease;
  line-height: 1.5;
}
.mcq-option:hover {
  background: var(--mcq-hover-bg);
  border-color: var(--border-light);
}
.mcq-option.disabled {
  cursor: default;
  pointer-events: none;
  opacity: 0.7;
}
.mcq-option.correct {
  background: var(--mcq-correct-bg);
  border-color: var(--mcq-correct-border);
  opacity: 1;
}
.mcq-option.wrong {
  background: var(--mcq-wrong-bg);
  border-color: var(--mcq-wrong-border);
  opacity: 1;
}

/* ── Learner Card ──────────────────────────────────────────── */
.learner-card {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}
.learner-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}
.learner-card.selected {
  border-color: var(--text-primary);
  background: rgba(255,255,255,0.04);
}

/* ── Progress Bar ──────────────────────────────────────────── */
.progress-bar-bg {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--accent-1);
  border-radius: 3px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Main Layout ───────────────────────────────────────────── */
.main-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.sidebar {
  width: 224px;
  min-height: 100vh;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 0.75rem;
  gap: 0.2rem;
  position: fixed;
  top: 0; left: 0;
}
.sidebar-logo {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 1.75rem;
  padding: 0 0.5rem;
  letter-spacing: -0.03em;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 300;
  color: var(--text-muted);
  text-decoration: none;
  cursor: pointer;
}
.nav-item:hover   { background: var(--bg-card); color: var(--text-secondary); }
.nav-item.active  { background: rgba(128,128,128,0.08); color: var(--text-primary); }

.page-content {
  margin-left: 224px;
  padding: 2.5rem;
  min-height: 100vh;
}

/* ── Drop Zone ─────────────────────────────────────────────── */
.drop-zone {
  border: 1px dashed var(--border-light);
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s ease;
}
.drop-zone:hover, .drop-zone.dragging {
  border-color: var(--text-muted);
  background: rgba(128,128,128,0.03);
}

/* ── Spinner ───────────────────────────────────────────────── */
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  width: 18px; height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--text-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

/* ── Fade In ───────────────────────────────────────────────── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(15px); } to { opacity: 1; transform: translateY(0); } }
.fade-up { animation: fadeUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both; }

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Hero Styles ───────────────────────────────────────────── */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hero-announcement {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.35rem 0.8rem;
  border-radius: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.hero-announcement a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.hero-announcement a:hover {
  color: var(--text-primary);
}

/* ── Theme Toggle ──────────────────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  width: 100%;
  transition: all 0.15s ease;
}
.theme-toggle:hover {
  background: var(--bg-card);
  border-color: var(--border-light);
}

/* ── Streaming / generation animations ────────────────────────── */

/* Section streams in from slightly below */
@keyframes sectionStream {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0);    }
}
.section-stream {
  animation: sectionStream 0.38s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Diagram card pops in from slightly smaller + invisible */
@keyframes diagramPop {
  from { opacity: 0; transform: scale(0.93) translateY(10px); }
  to   { opacity: 1; transform: scale(1)    translateY(0);    }
}
.diagram-pop {
  animation: diagramPop 0.42s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

/* Inline diagram insertion — expands from 0 height */
@keyframes expandIn {
  from { max-height: 0;    opacity: 0; }
  to   { max-height: 700px; opacity: 1; }
}
.diagram-expand {
  animation: expandIn 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
  overflow: hidden;
}

/* Popover scales in from selection point */
@keyframes popoverIn {
  from { opacity: 0; transform: translateX(-50%) scale(0.88) translateY(-4px); }
  to   { opacity: 1; transform: translateX(-50%) scale(1)    translateY(0);    }
}
.popover-animated {
  animation: popoverIn 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

/* Toast fly-up in */
@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(16px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0);    }
}
/* Toast fade out */
@keyframes toastOut {
  from { opacity: 1; transform: translateX(-50%) translateY(0); }
  to   { opacity: 0; transform: translateX(-50%) translateY(8px); }
}
.toast-in  { animation: toastIn  0.28s cubic-bezier(0.22, 1, 0.36, 1) both; }
.toast-out { animation: toastOut 0.22s cubic-bezier(0.4, 0, 1, 1)    both; }

/* Typewriter cursor on streaming text */
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0; } }
.typewriter-cursor::after {
  content: "▍";
  display: inline-block;
  margin-left: 2px;
  animation: blink 0.9s step-end infinite;
  color: var(--text-muted);
  font-size: 0.85em;
}

/* Skeleton shimmer for loading placeholders */
@keyframes shimmer {
  from { background-position: -600px 0; }
  to   { background-position:  600px 0; }
}
.skeleton {
  background: linear-gradient(
    90deg,
    rgba(128,128,128,0.06) 25%,
    rgba(128,128,128,0.14) 50%,
    rgba(128,128,128,0.06) 75%
  );
  background-size: 600px 100%;
  animation: shimmer 1.6s ease-in-out infinite;
  border-radius: 6px;
}