frontend/src/pages/Setup.css

.setup-shell {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg-base);
}

.setup-bar {
  height: 64px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.setup-bar__left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.setup-back-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.setup-back-btn:hover {
  background: var(--surface);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.2);
}

.setup-bar__brand {
  display: flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-display); font-weight: 600; font-size: var(--text-lg);
  text-decoration: none; color: var(--text-primary); cursor: pointer;
}
.setup-bar__step {
  font-size: var(--text-sm); color: var(--text-muted); font-weight: 500;
}

.setup-body {
  flex: 1;
  display: grid;
  grid-template-columns: 280px 1fr;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  padding: var(--space-8) var(--space-6);
  gap: var(--space-8);
}

.setup-aside {
  position: sticky;
  top: calc(56px + var(--space-8));
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.setup-aside__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.setup-aside__sub {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}
.setup-aside__tip {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--amber-glow);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--radius-lg);
  font-size: var(--text-xs);
  color: var(--amber-600);
  line-height: 1.55;
}
.setup-aside__tip svg { flex-shrink: 0; margin-top: 1px; }

.setup-nav { display: flex; flex-direction: column; gap: var(--space-1); }
.setup-nav__item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  text-align: left;
  transition: all var(--dur-fast) var(--ease-out);
}
.setup-nav__item:hover { background: var(--bg-surface); color: var(--text-primary); }
.setup-nav__item.active { background: var(--ascent-blue-glow-strong); color: var(--ascent-blue-700); }
.setup-nav__dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--stone-400); flex-shrink: 0;
}
.setup-nav__dot[data-done="true"] { background: var(--success); }

.setup-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.setup-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.setup-section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex; align-items: center; gap: var(--space-3);
}
.setup-section__tag {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px var(--space-2);
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
}
.setup-section__note {
  font-size: var(--text-sm); color: var(--text-secondary);
  margin-top: calc(-1 * var(--space-4));
}

.setup-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.level-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-1);
  padding: var(--space-4);
  background: var(--bg-elevated);
  border: 1.5px solid var(--border-medium);
  border-radius: var(--radius-lg);
  text-align: left;
  transition: all var(--dur-fast) var(--ease-out);
}
.level-btn:hover { border-color: var(--primary); }
.level-btn--active { border-color: var(--primary); background: var(--ascent-blue-glow-strong); }
.level-btn__name { font-weight: 600; font-size: var(--text-base); color: var(--text-primary); }
.level-btn__desc { font-size: var(--text-xs); color: var(--text-secondary); line-height: 1.4; }
.level-btn--active .level-btn__name { color: var(--ascent-blue-700); }

.dropzone {
  border: 2px dashed var(--border-medium);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  cursor: pointer;
  transition: all var(--dur-base) var(--ease-out);
  display: flex; flex-direction: column; align-items: center; gap: var(--space-3);
  background: var(--bg-surface);
  user-select: none;
}
.dropzone:hover, .dropzone--drag { border-color: var(--primary); background: var(--ascent-blue-glow); }
.dropzone--done { border-color: var(--success); border-style: solid; background: var(--success-glow); }
.dropzone__icon {
  width: 44px; height: 44px; color: var(--text-muted);
}
.dropzone__icon--done { color: var(--success); }
.dropzone__icon svg { width: 100%; height: 100%; }
.dropzone__name  { font-weight: 600; font-size: var(--text-base); word-break: break-all; }
.dropzone__label { font-size: var(--text-base); color: var(--text-secondary); }
.dropzone__label span { color: var(--primary); text-decoration: underline; }
.dropzone__sub   { font-size: var(--text-xs); color: var(--text-muted); }

.setup-error {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-4);
  background: var(--danger-glow);
  border: 1px solid rgba(220,38,38,0.2);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--danger-dark);
  line-height: 1.5;
}
.setup-error svg { flex-shrink: 0; margin-top: 1px; }

.setup-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
}

/* ── Responsive ─────────────────────────────────────────────── */

/* Tablet */
@media (max-width: 960px) {
  .setup-body { grid-template-columns: 220px 1fr; gap: var(--space-6); padding: var(--space-6) var(--space-4); }
  .level-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Mobile */
@media (max-width: 768px) {
  .setup-body { grid-template-columns: 1fr; padding: var(--space-5) var(--space-4); gap: var(--space-5); }
  .setup-aside { position: static; }
  /* Horizontal nav with wrapping */
  .setup-nav { flex-direction: row; flex-wrap: wrap; }
  .setup-nav__item { flex: 1; min-width: 100px; justify-content: center; }
  /* Collapse 2-col rows to 1 */
  .setup-row { grid-template-columns: 1fr; }
  /* Level grid: 2-col on tablet, 1-col on phone */
  .level-grid { grid-template-columns: repeat(2, 1fr); }
  /* Dropzone: less padding */
  .dropzone { padding: var(--space-6) var(--space-4); }
  /* Actions: stack buttons */
  .setup-actions { flex-wrap: wrap; }
  .setup-actions .btn-primary,
  .setup-actions .btn-secondary { flex: 1; justify-content: center; }
}

/* Small phone */
@media (max-width: 480px) {
  .level-grid { grid-template-columns: 1fr; }
  .setup-bar { padding: 0 var(--space-4); }
  .setup-section__title { font-size: var(--text-xl); }
}