/* ═══════════════════════════════════════════════════════════════════
   TimetableAI — Classic Professional Theme
   Palette: Slate white · Indigo blue · Warm grays
   ═══════════════════════════════════════════════════════════════════ */

/* ─── RESET & BASE ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

:root {
  /* Backgrounds */
  --bg:        #f0f2f5;
  --surface:   #ffffff;
  --surface-2: #f8f9fb;
  --surface-3: #eef0f4;

  /* Borders */
  --border:    #e2e6ed;
  --border-2:  #c9d0db;

  /* Text */
  --text:      #1a2035;
  --text-2:    #4a5568;
  --text-3:    #9aa5b4;

  /* Brand */
  --primary:   #3d5af1;
  --primary-dk:#2a44d4;
  --primary-lt:#eef1fe;
  --accent:    #e8a020;
  --accent-lt: #fdf3e3;

  /* States */
  --success:   #059669;
  --success-lt:#ecfdf5;
  --danger:    #dc2626;
  --danger-lt: #fef2f2;
  --warning:   #d97706;
  --warning-lt:#fffbeb;

  /* Lab color */
  --lab:       #7c3aed;
  --lab-lt:    #f5f3ff;

  /* Fonts */
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  /* Layout */
  --nav-h:     60px;
  --radius:    10px;
  --radius-sm: 6px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.04);
  --shadow:    0 4px 12px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.05);
  --shadow-lg: 0 20px 48px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Playfair+Display:wght@600;700&family=JetBrains+Mono:wght@400;500&display=swap');

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  font-size: 14px;
}

::selection { background: rgba(61,90,241,0.15); }
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--surface-2); }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }

/* ─── NAVBAR ────────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  z-index: 1000;
}

.nav-left { display: flex; align-items: center; gap: 12px; }
.logo-icon { flex-shrink: 0; }
.logo-text {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}
.accent { color: var(--primary); }

.nav-center { display: flex; align-items: center; }
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  border-radius: 20px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-2);
}
.status-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--border-2);
}
.status-pill[data-status="idle"]    .status-dot { background: var(--border-2); }
.status-pill[data-status="running"] .status-dot { background: var(--accent); animation: pulse-dot 1s infinite; }
.status-pill[data-status="done"]    .status-dot { background: var(--success); }
.status-pill[data-status="error"]   .status-dot { background: var(--danger); }
.elapsed { font-size: 0.72rem; color: var(--primary); font-family: var(--font-mono); }

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.nav-right { display: flex; align-items: center; gap: 10px; }
.version-label {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-3);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 4px;
}
.shortcut-pill {
  display: inline-flex; align-items: center; gap: 3px;
  padding: 4px 10px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--surface-2);
  color: var(--text-2); font-size: 0.7rem; cursor: pointer;
  transition: var(--transition);
}
.shortcut-pill:hover { border-color: var(--primary); color: var(--primary); }
.shortcut-pill kbd {
  font-family: var(--font-mono); font-size: 0.65rem;
  padding: 1px 4px; background: var(--surface-3); border-radius: 3px;
}

/* ─── CONTAINER ─────────────────────────────────────────────────── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 36px) 24px 80px;
}

/* ─── PAGE HEADER ────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}
.page-header-icon {
  width: 48px; height: 48px;
  background: var(--primary-lt);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
}
.page-header-text h1 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 4px;
}
.page-header-text p {
  color: var(--text-2);
  font-size: 0.88rem;
}

/* ─── SECTION CARD ───────────────────────────────────────────────── */
.section-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  overflow: hidden;
}
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.section-title-group {
  display: flex; align-items: center; gap: 12px;
}
.section-badge {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--primary-lt);
  color: var(--primary);
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--font-mono);
  display: flex; align-items: center; justify-content: center;
}
.section-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}
.section-subtitle {
  font-size: 0.75rem;
  color: var(--text-3);
  margin-top: 1px;
}
.section-body { padding: 20px 24px; }

/* ─── ITEM LIST (for courses/rooms) ─────────────────────────────── */
.item-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
  min-height: 40px;
}
.item-list:empty::before {
  content: 'No items added yet.';
  font-size: 0.82rem;
  color: var(--text-3);
  font-style: italic;
  padding: 8px 0;
  display: block;
}
.item-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
  border-left: 3px solid var(--border-2);
}
.item-row:hover {
  border-color: var(--border-2);
  box-shadow: var(--shadow-sm);
}
.item-row.item-theory { border-left-color: var(--primary); }
.item-row.item-lab    { border-left-color: var(--lab); }
.item-row.item-room   { border-left-color: var(--success); }

.item-row-content { flex: 1; min-width: 0; }
.item-row-title {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.item-row-meta {
  font-size: 0.73rem;
  color: var(--text-3);
  margin-top: 1px;
}

.item-row-badge {
  font-size: 0.6rem; font-weight: 700;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 7px; border-radius: 10px;
  white-space: nowrap; flex-shrink: 0;
}
.badge-theory { background: var(--primary-lt);  color: var(--primary); }
.badge-lab    { background: var(--lab-lt);       color: var(--lab); }
.badge-room   { background: var(--success-lt);   color: var(--success); }
.badge-labroom{ background: var(--warning-lt);   color: var(--warning); }

.item-row-actions {
  display: flex; gap: 4px; flex-shrink: 0;
}

/* ─── INLINE ADD AREA ────────────────────────────────────────────── */
.add-area {
  border: 1.5px dashed var(--border-2);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--text-3);
  font-size: 0.82rem;
  transition: var(--transition);
  background: transparent;
  width: 100%;
  text-align: left;
  margin-top: 4px;
}
.add-area:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-lt);
}
.add-area svg { flex-shrink: 0; }

/* ─── BUTTONS ────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-dk); border-color: var(--primary-dk); }

.btn-secondary {
  background: var(--surface);
  color: var(--text-2);
  border-color: var(--border-2);
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-lt); }

.btn-danger {
  background: var(--danger-lt);
  color: var(--danger);
  border-color: transparent;
}
.btn-danger:hover { background: #fee2e2; }

.btn-ghost {
  background: transparent;
  color: var(--text-3);
  border-color: transparent;
  padding: 5px 8px;
}
.btn-ghost:hover { color: var(--danger); background: var(--danger-lt); }

.btn-sm { padding: 5px 12px; font-size: 0.78rem; }
.btn-icon {
  padding: 5px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-3);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex; align-items: center;
}
.btn-icon:hover { color: var(--danger); background: var(--danger-lt); border-color: #fecaca; }
.btn-icon-edit:hover { color: var(--primary); background: var(--primary-lt); border-color: #c7d2fe; }

.btn-run-main {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; max-width: 380px;
  margin: 32px auto 0;
  padding: 14px 32px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(61,90,241,0.35);
}
.btn-run-main:hover {
  background: var(--primary-dk);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(61,90,241,0.4);
}
.btn-run-main:active { transform: scale(0.98); }
.btn-run-main:disabled { opacity: 0.55; pointer-events: none; cursor: not-allowed; }
.btn-primary__text, .btn-primary__loader { display: inline-flex; align-items: center; gap: 8px; }
.spinner { animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── DAYS TOGGLE ────────────────────────────────────────────────── */
.days-grid {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.day-toggle {
  padding: 7px 16px;
  border-radius: 20px;
  border: 1.5px solid var(--border-2);
  background: var(--surface);
  color: var(--text-2);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
}
.day-toggle:hover { border-color: var(--primary); color: var(--primary); }
.day-toggle.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(61,90,241,0.3);
}

/* ─── TIME SLOTS LIST ────────────────────────────────────────────── */
.slots-container {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-bottom: 10px;
}
.slot-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px;
  border-radius: 20px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-2);
  font-weight: 500;
}
.slot-tag button {
  background: none; border: none; cursor: pointer;
  color: var(--text-3); line-height: 1; padding: 0;
  font-size: 0.85rem; display: flex; align-items: center;
  transition: var(--transition);
}
.slot-tag button:hover { color: var(--danger); }
.slot-add-inline {
  display: flex; gap: 6px; align-items: center;
}
.slot-add-inline input {
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  width: 80px;
  outline: none;
  transition: var(--transition);
  background: var(--surface);
  color: var(--text);
}
.slot-add-inline input:focus { border-color: var(--primary); }

/* ─── BATCH TAGS ─────────────────────────────────────────────────── */
.batch-tags {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-bottom: 10px;
}
.batch-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 14px;
  border-radius: 20px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-2);
  font-weight: 500;
}
.batch-tag button {
  background: none; border: none; cursor: pointer;
  color: var(--text-3); line-height: 1; padding: 0;
  display: flex; align-items: center; transition: var(--transition);
}
.batch-tag button:hover { color: var(--danger); }
.batch-add-inline {
  display: flex; gap: 6px; align-items: center;
}
.batch-add-inline input {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.82rem;
  width: 120px;
  outline: none;
  transition: var(--transition);
  background: var(--surface);
  color: var(--text);
}
.batch-add-inline input:focus { border-color: var(--primary); }

/* ─── FORM CONTROLS (global) ─────────────────────────────────────── */
.form-group { margin-bottom: 16px; }
.form-group:last-child { margin-bottom: 0; }
.form-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-hint { font-size: 0.72rem; color: var(--text-3); margin-top: 4px; }
.form-input, .form-select {
  width: 100%;
  padding: 9px 12px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.85rem;
  outline: none;
  transition: var(--transition);
}
.form-input:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(61,90,241,0.1);
}
.form-input::placeholder { color: var(--text-3); }
.form-select {
  appearance: none; -webkit-appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4' stroke='%239aa5b4' stroke-width='2' stroke-linecap='round' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 32px;
}
.form-select option { background: var(--surface); color: var(--text); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }

/* ─── GA ACCORDION ───────────────────────────────────────────────── */
.accordion { border: none; }
.accordion-trigger {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; padding: 10px 0;
  font-family: var(--font-body); font-size: 0.85rem; font-weight: 600;
  color: var(--text-2); cursor: pointer; list-style: none; transition: var(--transition);
  background: none; border: none; text-align: left;
}
.accordion-trigger:hover { color: var(--primary); }
.accordion-trigger::-webkit-details-marker { display: none; }
.accordion-arrow { transition: transform 250ms ease; color: var(--text-3); }
details[open] .accordion-arrow { transform: rotate(180deg); color: var(--primary); }
.accordion-body { padding-top: 14px; animation: fadeDown 200ms ease; }
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── CONSTRAINTS SECTION ────────────────────────────────────────── */
.constraints-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.constraint-chips {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.constraint-chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--success-lt);
  border: 1px solid #a7f3d0;
  color: var(--success);
  font-size: 0.72rem;
  font-weight: 600;
}

/* ─── HERO STATE ─────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 72px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.hero-visual { margin-bottom: 24px; opacity: 0.6; animation: float 4s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.dna-dot { animation: dna-glow 3s ease-in-out infinite alternate; }
.d1, .d5, .d9  { animation-delay: 0s; }
.d2, .d6, .d10 { animation-delay: 0.4s; }
.d3, .d7       { animation-delay: 0.8s; }
.d4, .d8       { animation-delay: 1.2s; }
@keyframes dna-glow { 0% { opacity: 0.3; } 100% { opacity: 1; } }
.hero-title {
  font-family: var(--font-display);
  font-size: 2rem; font-weight: 700; color: var(--text);
  margin-bottom: 10px;
}
.hero-sub { color: var(--text-2); font-size: 0.93rem; max-width: 380px; margin: 0 auto 24px; }
.hero-pills { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; }
.pill {
  padding: 5px 14px; border-radius: 20px;
  border: 1px solid var(--border);
  font-size: 0.75rem; color: var(--text-2);
  background: var(--surface-2);
}

/* ─── SKELETON ───────────────────────────────────────────────────── */
.skeleton-section { padding: 24px 0; }
.skeleton-status { text-align: center; margin-bottom: 24px; }
.skeleton-evolving {
  font-size: 0.85rem; color: var(--primary);
  animation: pulse-text 1.4s ease-in-out infinite;
}
@keyframes pulse-text { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.skeleton-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px; margin-bottom: 14px;
}
.skeleton-card, .skeleton-grid, .skeleton-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative; overflow: hidden;
}
.skeleton-card { height: 96px; }
.skeleton-grid  { height: 280px; margin-bottom: 14px; }
.skeleton-block { height: 180px; }
.skeleton-card::after, .skeleton-grid::after, .skeleton-block::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(0,0,0,0.04) 50%, transparent 100%);
  animation: shimmer 1.6s ease-in-out infinite;
}
@keyframes shimmer { 0% { transform: translateX(-100%); } 100% { transform: translateX(100%); } }
.skeleton-row-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* ─── RESULTS ────────────────────────────────────────────────────── */
.results { padding-bottom: 40px; }
.anim-section { opacity: 0; transform: translateY(10px); }
.anim-section.anim-enter { animation: slideUp 350ms ease forwards; }
@keyframes slideUp { to { opacity: 1; transform: translateY(0); } }

/* ─── STAT CARDS ─────────────────────────────────────────────────── */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px; margin-bottom: 20px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
  transition: var(--transition);
}
.stat-card:hover { box-shadow: var(--shadow); }
.stat-card::before {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 3px; background: var(--primary);
  transform: scaleX(0); transform-origin: left;
  transition: transform 350ms ease;
}
.stat-card:hover::before { transform: scaleX(1); }
.stat-card__label {
  font-size: 0.65rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--text-3); margin-bottom: 6px;
}
.stat-card__value {
  font-family: var(--font-mono);
  font-size: 1.9rem; font-weight: 700;
  color: var(--text); line-height: 1.2;
}
.stat-card__icon {
  position: absolute; bottom: 10px; right: 14px;
  font-size: 1.8rem; opacity: 0.07;
  pointer-events: none;
}

/* ─── RESULT PANELS ──────────────────────────────────────────────── */
.result-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  overflow: hidden;
}
.result-panel-header {
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
  flex-wrap: wrap; gap: 10px;
}
.result-panel-title {
  font-size: 0.93rem; font-weight: 700;
  color: var(--text);
}
.result-panel-body { padding: 0; }

/* ─── VIEW TABS ──────────────────────────────────────────────────── */
.view-tabs {
  display: flex; gap: 0;
  border-bottom: 1px solid var(--border);
  padding: 0 22px;
  background: var(--surface);
}
.view-tab {
  padding: 10px 18px;
  border: none; border-bottom: 2.5px solid transparent;
  background: transparent;
  color: var(--text-3);
  font-family: var(--font-body); font-size: 0.82rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
  margin-bottom: -1px;
}
.view-tab:hover { color: var(--text-2); }
.view-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* ─── ENTITY PILLS ───────────────────────────────────────────────── */
.entity-selector { padding: 14px 22px 0; }
.entity-pills { display: flex; flex-wrap: wrap; gap: 6px; }
.entity-pill {
  padding: 5px 14px; border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: 0.78rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
}
.entity-pill:hover { border-color: var(--primary); color: var(--primary); }
.entity-pill.active {
  background: var(--primary); border-color: var(--primary);
  color: #fff; box-shadow: 0 2px 6px rgba(61,90,241,0.25);
}

/* ─── TIMETABLE GRID ─────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; padding: 16px 22px 22px; }
.timetable {
  width: 100%; border-collapse: collapse;
  font-size: 0.78rem; min-width: 600px;
}
.timetable th {
  padding: 9px 12px; text-align: center;
  font-weight: 700; font-size: 0.68rem;
  text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  position: sticky; top: 0; z-index: 2;
  white-space: nowrap;
}
.timetable td {
  padding: 6px 8px;
  border: 1px solid var(--border);
  vertical-align: top; min-width: 100px;
}
.timetable tr:hover td { background: rgba(61,90,241,0.02); }
.th-time, .td-time {
  background: var(--surface-3) !important;
  font-family: var(--font-mono);
  font-size: 0.72rem; font-weight: 600;
  color: var(--primary) !important;
  white-space: nowrap;
  position: sticky; left: 0; z-index: 3;
  min-width: 68px;
}
.cell-empty { color: var(--text-3); font-size: 0.7rem; text-align: center; height: 36px; }
.cell-continuation { background: rgba(124,58,237,0.03); }

/* ─── SESSION CHIPS ──────────────────────────────────────────────── */
.chip {
  position: relative;
  display: block; padding: 6px 8px; margin: 2px 0;
  border-radius: var(--radius-sm); border-left: 3px solid currentColor;
  font-size: 0.72rem; font-weight: 500;
  transition: var(--transition); cursor: default;
}
.chip:hover { filter: brightness(0.95); }
.chip-name {
  display: block; font-weight: 700;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 130px;
}
.chip-sub {
  display: block; font-size: 0.62rem; opacity: 0.8;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 130px;
}
.chip-lab-badge {
  position: absolute; top: 3px; right: 4px;
  font-size: 0.48rem; font-family: var(--font-mono); font-weight: 800;
  letter-spacing: 0.06em; padding: 1px 4px; border-radius: 3px;
  background: var(--lab-lt); color: var(--lab); border: 1px solid #ddd6fe;
}

/* ─── DETAIL TABLE ───────────────────────────────────────────────── */
.filter-wrap { flex-shrink: 0; }
.filter-input {
  padding: 7px 12px; background: var(--surface);
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-size: 0.82rem; outline: none;
  width: 200px; transition: var(--transition);
}
.filter-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(61,90,241,0.08); }
.detail-table { width: 100%; border-collapse: collapse; font-size: 0.81rem; }
.detail-table th {
  padding: 10px 14px; text-align: left;
  font-size: 0.68rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-2);
  background: var(--surface-2); border-bottom: 2px solid var(--border);
  cursor: pointer; user-select: none; transition: var(--transition);
}
.detail-table th:hover { color: var(--primary); }
.detail-table th.sort-asc::after  { content: ' ↑'; color: var(--primary); }
.detail-table th.sort-desc::after { content: ' ↓'; color: var(--primary); }
.detail-table td {
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  color: var(--text); transition: var(--transition);
}
.detail-table tbody tr { border-left: 3px solid transparent; transition: var(--transition); }
.detail-table tbody tr:hover { border-left-color: var(--primary); }
.detail-table tbody tr:hover td { background: rgba(61,90,241,0.02); }

/* ─── TYPE BADGES ────────────────────────────────────────────────── */
.type-badge {
  display: inline-block; padding: 2px 9px; border-radius: 10px;
  font-size: 0.62rem; font-weight: 700;
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.04em;
}
.type-badge--theory { background: var(--primary-lt); color: var(--primary); }
.type-badge--lab    { background: var(--lab-lt);      color: var(--lab); }

/* ─── VIOLATIONS ─────────────────────────────────────────────────── */
.violations-list {
  list-style: none; display: flex; flex-direction: column; gap: 6px;
  padding: 16px 22px; max-height: 260px; overflow-y: auto;
}
.violation-item {
  padding: 9px 14px;
  background: var(--danger-lt); border: 1px solid #fecaca;
  border-left: 3px solid var(--danger);
  border-radius: var(--radius-sm);
  font-size: 0.8rem; color: var(--text); line-height: 1.5;
}

/* ─── TWO-COL ────────────────────────────────────────────────────── */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.two-col .result-panel { margin-bottom: 0; }
.chart-wrap {
  padding: 16px 22px 22px;
  background: var(--surface-2);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  height: 260px;
  position: relative;
}
.chart-wrap canvas { width: 100% !important; height: 100% !important; display: block; }

/* ─── CONFIG GRID OUTPUT ─────────────────────────────────────────── */
.config-grid-output { padding: 16px 22px 22px; display: flex; flex-wrap: wrap; gap: 8px; }
.cfg-item {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 20px;
  background: var(--surface-2); border: 1px solid var(--border);
  font-size: 0.75rem;
}
.cfg-key { color: var(--text-2); font-weight: 500; }
.cfg-val { font-family: var(--font-mono); font-weight: 700; color: var(--primary); }

/* ─── GOOGLE SHEETS SECTION ──────────────────────────────────────── */
.sheets-info-box {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 16px; margin-bottom: 16px;
  background: var(--primary-lt);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius-sm);
}
.sheets-info-icon { color: var(--primary); flex-shrink: 0; }
.sheets-info-title { font-size: 0.8rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.sheets-info-title strong { color: var(--primary); }
.email-box {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--border-2);
  border-radius: var(--radius-sm); padding: 6px 12px;
}
.email-box code {
  font-family: var(--font-mono); font-size: 0.67rem;
  color: var(--primary); word-break: break-all; flex: 1; user-select: all;
}
.sheets-guide {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 14px; margin-bottom: 16px;
}
.guide-title { font-size: 0.73rem; font-weight: 700; color: var(--text-2); margin-bottom: 6px; }
.guide-steps {
  font-size: 0.73rem; color: var(--text-2); padding-left: 16px;
  line-height: 1.8; margin: 0;
}
.input-hint { display: block; font-size: 0.7rem; color: var(--text-3); margin-top: 4px; }
.input-shake { animation: inputShake 0.5s ease; border-color: var(--danger) !important; }
@keyframes inputShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}

/* ─── MODAL ──────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.3);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  animation: overlayIn 150ms ease;
}
@keyframes overlayIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%; max-width: 500px;
  animation: modalIn 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.92) translateY(12px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.modal-title { font-weight: 700; font-size: 0.95rem; color: var(--text); }
.modal-close {
  background: none; border: none; cursor: pointer;
  color: var(--text-3); padding: 4px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center;
  transition: var(--transition);
  font-size: 1.2rem; line-height: 1;
}
.modal-close:hover { color: var(--danger); background: var(--danger-lt); }

.modal-body { padding: 22px 22px 8px; }
.modal-footer {
  display: flex; justify-content: flex-end; gap: 8px;
  padding: 14px 22px 20px;
}

/* ─── TOAST ──────────────────────────────────────────────────────── */
#toast-container {
  position: fixed; top: calc(var(--nav-h) + 12px); right: 16px;
  z-index: 9999; display: flex; flex-direction: column; gap: 8px; max-width: 380px;
}
.toast {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 12px 14px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: 0.8rem; color: var(--text);
  animation: toastIn 250ms ease; position: relative; overflow: hidden;
  box-shadow: var(--shadow);
}
.toast--success { border-left: 3px solid var(--success); }
.toast--error   { border-left: 3px solid var(--danger);  }
.toast--info    { border-left: 3px solid var(--primary); }
.toast-icon { font-weight: 700; flex-shrink: 0; width: 16px; text-align: center; }
.toast--success .toast-icon { color: var(--success); }
.toast--error   .toast-icon { color: var(--danger); }
.toast--info    .toast-icon { color: var(--primary); }
.toast-msg { flex: 1; line-height: 1.4; }
.toast-close {
  background: none; border: none; color: var(--text-3); font-size: 1.1rem;
  cursor: pointer; padding: 0 4px; line-height: 1; transition: var(--transition);
}
.toast-close:hover { color: var(--text); }
.toast-progress {
  position: absolute; bottom: 0; left: 0;
  height: 2px; background: var(--primary);
  animation: toast-timer 5s linear forwards;
}
.toast--error .toast-progress { background: var(--danger); }
@keyframes toastIn { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: none; } }
@keyframes toast-timer { from { width: 100%; } to { width: 0; } }
.toast--out { animation: toastOut 250ms ease forwards; }
@keyframes toastOut { to { opacity: 0; transform: translateX(30px); } }

/* ─── FOOTER ─────────────────────────────────────────────────────── */
.footer {
  text-align: center; padding: 32px 20px;
  color: var(--text-3); font-size: 0.75rem;
  border-top: 1px solid var(--border); margin-top: 32px;
}

/* ─── FOCUS ──────────────────────────────────────────────────────── */
*:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ─── RESPONSIVE ─────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
  .skeleton-stats { grid-template-columns: repeat(2, 1fr); }
  .skeleton-row-pair { grid-template-columns: 1fr; }
  .constraints-grid { grid-template-columns: 1fr; }
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .container { padding-left: 14px; padding-right: 14px; }
  .navbar { padding: 0 16px; }
  .version-label { display: none; }
  .shortcut-pill { display: none; }
  .stats-bar { grid-template-columns: 1fr 1fr; }
  .page-header-text h1 { font-size: 1.35rem; }
  .view-tabs { overflow-x: auto; flex-wrap: nowrap; }
  .entity-pills { gap: 5px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}