/* ============================================================
   style.css — Custom CSS for Timetable Creator
   (Complements Tailwind CSS utilities)
   ============================================================ */

/* ── Google Font ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── Theme Variables ─────────────────────────────────────── */
:root {
  --c-bg:          #0f0f1a;
  --c-bg2:         #14142a;
  --c-surface:     #1e1e38;
  --c-surface2:    #252545;
  --c-border:      rgba(255,255,255,0.09);
  --c-text:        #e2e8f0;
  --c-text2:       #94a3b8;
  --c-text3:       #64748b;
  --c-primary:     #6366f1;
  --c-primary-h:   #818cf8;
  --c-accent:      #06b6d4;
  --c-success:     #10b981;
  --c-warning:     #f59e0b;
  --c-danger:      #f43f5e;
  --glass-bg:      rgba(255,255,255,0.04);
  --glass-border:  rgba(255,255,255,0.10);
  --shadow-lg:     0 20px 60px rgba(0,0,0,0.5);
  --shadow-md:     0 8px 32px rgba(0,0,0,0.4);
  --shadow-sm:     0 2px 12px rgba(0,0,0,0.3);
  --radius-xl:     1.25rem;
  --radius-lg:     1rem;
  --radius-md:     0.625rem;
  --radius-sm:     0.375rem;
  --transition:    all 0.25s cubic-bezier(.4,0,.2,1);
}

html:not(.dark) {
  --c-bg:          #f0f4ff;
  --c-bg2:         #e8eeff;
  --c-surface:     #ffffff;
  --c-surface2:    #f8faff;
  --c-border:      rgba(99,102,241,0.12);
  --c-text:        #0f172a;
  --c-text2:       #475569;
  --c-text3:       #94a3b8;
  --glass-bg:      rgba(255,255,255,0.75);
  --glass-border:  rgba(99,102,241,0.15);
  --shadow-lg:     0 20px 60px rgba(99,102,241,0.15);
  --shadow-md:     0 8px 32px rgba(99,102,241,0.10);
  --shadow-sm:     0 2px 12px rgba(99,102,241,0.08);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}

::selection { background: rgba(99,102,241,0.35); color: #fff; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--c-bg2); }
::-webkit-scrollbar-thumb { background: var(--c-primary); border-radius: 99px; }

/* ── Typography ──────────────────────────────────────────── */
h1,h2,h3,h4,h5,h6 { line-height: 1.2; font-weight: 700; }

/* ── GLASS CARD ──────────────────────────────────────────── */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

/* ── GRADIENT TEXT ───────────────────────────────────────── */
.gradient-text {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(99,102,241,0.4);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}
.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity 0.25s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(99,102,241,0.55); }
.btn-primary:hover::after { opacity: 1; }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.3rem;
  background: var(--glass-bg);
  color: var(--c-text);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-secondary:hover {
  background: var(--c-surface2);
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  background: rgba(244,63,94,0.15);
  color: #f43f5e;
  border: 1px solid rgba(244,63,94,0.25);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}
.btn-danger:hover { background: rgba(244,63,94,0.25); }

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: var(--glass-bg);
  color: var(--c-text2);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.85rem;
}
.btn-icon:hover { background: var(--c-surface2); color: var(--c-primary); border-color: var(--c-primary); }
.btn-icon:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── STICKY HEADER ───────────────────────────────────────── */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

.nav-link {
  color: var(--c-text2);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}
.nav-link:hover, .nav-link.active { color: var(--c-primary); }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: var(--c-primary);
  border-radius: 99px;
}

/* ── HERO ────────────────────────────────────────────────── */
.hero-gradient {
  background: radial-gradient(ellipse at 60% 0%, rgba(99,102,241,0.2) 0%, transparent 60%),
              radial-gradient(ellipse at 10% 80%, rgba(139,92,246,0.15) 0%, transparent 50%),
              var(--c-bg);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 1rem;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.25);
  border-radius: 99px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-primary-h);
  margin-bottom: 1.5rem;
}

.hero-demo-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* ── FEATURE CARDS ───────────────────────────────────────── */
.feature-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, #6366f1, #8b5cf6);
  transform: scaleX(0);
  transition: transform 0.3s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(99,102,241,0.3); }
.feature-card:hover::before { transform: scaleX(1); }

.feature-icon-wrap {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

/* ── BUILDER SECTION ─────────────────────────────────────── */
#builder-section {
  background: var(--c-bg2);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.builder-layout {
  display: flex;
  flex: 1;
  gap: 0;
  height: calc(100vh - 64px);
  overflow: hidden;
}

/* ── SIDEBAR ─────────────────────────────────────────────── */
#sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  overflow-y: auto;
  transition: transform 0.3s cubic-bezier(.4,0,.2,1);
  display: flex;
  flex-direction: column;
  gap: 0;
  z-index: 50;
}

.sidebar-section {
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--c-border);
}
.sidebar-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text3);
  margin-bottom: 0.75rem;
}

/* Day toggles */
.day-toggle-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}
.day-btn {
  padding: 0.3rem 0.1rem;
  font-size: 0.62rem;
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--c-border);
  background: var(--c-bg2);
  color: var(--c-text3);
  cursor: pointer;
  transition: var(--transition);
}
.day-btn.active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}
.day-btn:hover:not(.active) {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

/* Period list */
.period-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.4rem;
}
.period-time-input {
  flex: 1;
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  color: var(--c-text);
  font-size: 0.75rem;
  padding: 0.3rem 0.5rem;
  min-width: 0;
  font-family: 'Inter', sans-serif;
}
.period-time-input:focus { outline: none; border-color: var(--c-primary); }
.period-sep { color: var(--c-text3); font-size: 0.75rem; }
.period-delete-btn {
  background: none;
  border: none;
  color: var(--c-danger);
  cursor: pointer;
  padding: 0.2rem;
  font-size: 0.9rem;
  opacity: 0.6;
  transition: opacity 0.2s;
}
.period-delete-btn:hover { opacity: 1; }

/* Stats */
.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}
.stat-item {
  background: var(--c-bg2);
  border-radius: var(--radius-md);
  padding: 0.6rem;
  text-align: center;
}
.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-primary);
  line-height: 1;
}
.stat-key {
  font-size: 0.65rem;
  color: var(--c-text3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

/* Conflict badge */
.conflict-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  background: rgba(244,63,94,0.15);
  border: 1px solid rgba(244,63,94,0.3);
  border-radius: 99px;
  font-size: 0.75rem;
  color: #f43f5e;
  font-weight: 600;
}

/* ── GRID AREA ───────────────────────────────────────────── */
.grid-area {
  flex: 1;
  overflow: auto;
  padding: 1.5rem;
  background: var(--c-bg2);
}

/* ── TIMETABLE TABLE ─────────────────────────────────────── */
.tt-grid-wrapper {
  background: var(--c-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--c-border);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  min-width: 700px;
}

.tt-title-bar {
  padding: 0.75rem 1.25rem;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
}

.tt-scroll-wrap { overflow-x: auto; }

.tt-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: auto;
}

/* Header row */
.tt-day-hdr, .tt-time-hdr {
  padding: 0.75rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-text2);
  background: var(--c-surface2);
  border-bottom: 1px solid var(--c-border);
  white-space: nowrap;
}
.tt-time-hdr { min-width: 90px; text-align: center; }
.tt-day-hdr  { text-align: center; min-width: 130px; }

.day-abbr { display: none; }
.day-full  { display: inline; }

/* Time cells */
.tt-time-cell {
  padding: 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--c-text3);
  text-align: center;
  background: var(--c-surface2);
  border-right: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  vertical-align: middle;
  white-space: nowrap;
  min-width: 90px;
}
.time-end {
  display: block;
  font-size: 0.65rem;
  color: var(--c-text3);
  opacity: 0.7;
}

/* Data cells */
.tt-cell {
  padding: 0.3rem;
  border-right: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  vertical-align: top;
  min-width: 130px;
  height: 80px;
  position: relative;
  transition: background 0.15s;
}
.tt-cell:last-child { border-right: none; }
.tt-table tr:last-child .tt-cell { border-bottom: none; }

.tt-cell.drag-over {
  background: rgba(99,102,241,0.12);
  border: 2px dashed var(--c-primary);
}
.tt-cell.search-highlight {
  background: rgba(6,182,212,0.1);
  outline: 2px solid rgba(6,182,212,0.4);
  outline-offset: -2px;
}

/* Empty cell slot */
.empty-cell {
  width: 100%;
  height: 100%;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text3);
  font-size: 1rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  opacity: 0.3;
}
.empty-cell:hover {
  opacity: 1;
  background: rgba(99,102,241,0.08);
  color: var(--c-primary);
}

/* Entry card */
.entry-card {
  width: 100%;
  min-height: 68px;
  padding: 0.45rem 0.55rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  user-select: none;
}
.entry-card:hover { transform: scale(1.02); box-shadow: 0 4px 16px rgba(0,0,0,0.3); z-index: 2; }
.entry-card.dragging { opacity: 0.5; transform: scale(0.97); }
.entry-card.conflict {
  outline: 2px solid #f43f5e;
  outline-offset: 1px;
  animation: conflict-pulse 1.5s infinite;
}

.entry-subject { font-size: 0.78rem; font-weight: 700; line-height: 1.2; margin-bottom: 2px; }
.entry-meta    { font-size: 0.65rem; opacity: 0.85; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.entry-notes   { font-size: 0.6rem; opacity: 0.7; margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.entry-delete {
  position: absolute;
  top: 3px; right: 3px;
  width: 18px; height: 18px;
  background: rgba(0,0,0,0.25);
  border: none;
  border-radius: 50%;
  color: inherit;
  font-size: 0.65rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
}
.entry-card:hover .entry-delete { opacity: 1; }
.entry-delete:hover { background: rgba(244,63,94,0.7); color: #fff; }

/* ── MODAL ───────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 200;
  backdrop-filter: blur(4px);
}

.modal-box {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  opacity: 0;
  z-index: 210;
  background: var(--c-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 500px;
  max-height: 92vh;
  overflow-y: auto;
  transition: transform 0.25s cubic-bezier(.34,1.56,.64,1), opacity 0.2s;
}
.modal-box.modal-visible {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--c-border);
}

.modal-body { padding: 1.5rem; }
.modal-footer {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--c-border);
}

/* Form inputs */
.form-group { margin-bottom: 1rem; }
.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-text2);
  margin-bottom: 0.4rem;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.6rem 0.85rem;
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  color: var(--c-text);
  font-size: 0.875rem;
  font-family: 'Inter', sans-serif;
  transition: border-color 0.2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-textarea { resize: vertical; min-height: 80px; }
.form-select option { background: var(--c-surface); }

.form-error { font-size: 0.75rem; color: var(--c-danger); margin-top: 0.25rem; min-height: 1rem; }

/* Two-column form grid */
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

/* Color palette */
.color-palette-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.color-swatch {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  border: 2px solid transparent;
}
.color-swatch:hover { transform: scale(1.15); }
.color-swatch.selected {
  border-color: #fff;
  box-shadow: 0 0 0 2px var(--c-primary), 0 4px 8px rgba(0,0,0,0.3);
  transform: scale(1.1);
}

.color-preview-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
#color-preview {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--c-border);
  flex-shrink: 0;
  transition: background 0.2s;
}

/* ── TOAST NOTIFICATIONS ─────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  background: var(--c-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-text);
  pointer-events: auto;
  opacity: 0;
  transform: translateX(100%);
  transition: opacity 0.3s, transform 0.3s;
  max-width: 320px;
  min-width: 200px;
}
.toast.toast-show { opacity: 1; transform: translateX(0); }
.toast-success { border-left: 3px solid var(--c-success); }
.toast-error   { border-left: 3px solid var(--c-danger); }
.toast-info    { border-left: 3px solid var(--c-primary); }
.toast-warning { border-left: 3px solid var(--c-warning); }
.toast-success .fa { color: var(--c-success); }
.toast-error   .fa { color: var(--c-danger); }
.toast-info    .fa { color: var(--c-primary); }
.toast-warning .fa { color: var(--c-warning); }
.toast-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--c-text3);
  cursor: pointer;
  font-size: 0.75rem;
  padding: 0.1rem 0.2rem;
}

/* ── TEMPLATE CARDS ──────────────────────────────────────── */
.template-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.template-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99,102,241,0.4);
}
.template-card-header {
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}
.template-card-body { padding: 1.25rem; }
.template-card-name { font-weight: 700; font-size: 1rem; margin-bottom: 0.35rem; }
.template-card-desc { font-size: 0.8rem; color: var(--c-text2); line-height: 1.5; }

/* ── FAQ ─────────────────────────────────────────────────── */
.faq-item {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: rgba(99,102,241,0.3); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.25rem;
  background: var(--glass-bg);
  border: none;
  color: var(--c-text);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  text-align: left;
  transition: background 0.2s;
}
.faq-question:hover { background: var(--c-surface2); }
.faq-icon { transition: transform 0.25s; color: var(--c-primary); flex-shrink: 0; }
.faq-answer {
  padding: 0 1.25rem 1.1rem;
  font-size: 0.875rem;
  color: var(--c-text2);
  line-height: 1.7;
  background: var(--glass-bg);
}

/* ── SECTION HEADINGS ────────────────────────────────────── */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.9rem;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-primary-h);
  margin-bottom: 1rem;
}

/* ── SCROLL ANIMATIONS ───────────────────────────────────── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.animate-in { opacity: 1; transform: translateY(0); }

/* ── ANIMATIONS ──────────────────────────────────────────── */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-10px); }
}
@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(99,102,241,0.4); }
  70% { transform: scale(1); box-shadow: 0 0 0 12px rgba(99,102,241,0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(99,102,241,0); }
}
@keyframes shimmer {
  0% { background-position: -500px 0; }
  100% { background-position: 500px 0; }
}
@keyframes conflict-pulse {
  0%, 100% { outline-color: #f43f5e; }
  50%       { outline-color: transparent; }
}
@keyframes gradient-shift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.float-anim   { animation: float 4s ease-in-out infinite; }
.pulse-anim   { animation: pulse-ring 2.5s cubic-bezier(.455,.03,.515,.955) infinite; }

/* ── SHARE MODAL ─────────────────────────────────────────── */
#share-url-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  color: var(--c-text);
  font-size: 0.8rem;
  font-family: monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── EXPORT SPINNER ──────────────────────────────────────── */
#export-spinner {
  position: fixed;
  inset: 0;
  z-index: 9998;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1rem;
  backdrop-filter: blur(4px);
}
.spinner-ring {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255,255,255,0.15);
  border-top-color: var(--c-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── MOBILE SIDEBAR ──────────────────────────────────────── */
@media (max-width: 768px) {
  .builder-layout { overflow: visible; height: auto; }

  #sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    transform: translateX(-100%);
    z-index: 300;
    box-shadow: var(--shadow-lg);
    width: 85%;
    max-width: 300px;
  }
  #sidebar.sidebar-open { transform: translateX(0); }

  #sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 299;
    backdrop-filter: blur(2px);
  }

  .grid-area { padding: 1rem 0.5rem; overflow-x: auto; }
  .tt-grid-wrapper { min-width: 0; }
  .day-full { display: none; }
  .day-abbr { display: inline; }
  .tt-cell { min-width: 85px; height: 70px; }
  .form-grid-2 { grid-template-columns: 1fr; }
}

/* ── PRINT STYLES ────────────────────────────────────────── */
@media print {
  body > *:not(#timetable-capture-area):not(#builder-section) { display: none !important; }
  #site-header, #sidebar, .grid-area > *:not(#timetable-grid) { display: none !important; }
  #timetable-capture-area { box-shadow: none !important; border: 1px solid #ddd !important; }

  .tt-table { border-collapse: collapse; }
  .tt-cell, .tt-time-cell, .tt-day-hdr, .tt-time-hdr { border: 1px solid #e2e8f0 !important; }
  .entry-card { box-shadow: none !important; }
  .entry-delete { display: none !important; }
  .empty-cell { display: none !important; }

  * { color-adjust: exact; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}

/* ── HERO MINI TIMETABLE DEMO ────────────────────────────── */
.mini-demo-table { width: 100%; border-collapse: collapse; font-size: 0.72rem; }
.mini-demo-table th {
  padding: 0.4rem 0.5rem;
  background: rgba(99,102,241,0.15);
  color: #a5b4fc;
  font-weight: 600;
  font-size: 0.65rem;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.mini-demo-table td {
  padding: 0.3rem;
  border: 1px solid rgba(255,255,255,0.06);
  height: 48px;
  vertical-align: top;
}
.mini-entry {
  border-radius: 5px;
  padding: 0.25rem 0.4rem;
  font-size: 0.65rem;
  font-weight: 600;
  color: #fff;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* ── KEYBOARD SHORTCUT LIST ──────────────────────────────── */
.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--c-border);
}
.shortcut-row:last-child { border-bottom: none; }
kbd {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  font-size: 0.72rem;
  font-family: monospace;
  color: var(--c-primary);
}

/* ── FOOTER ──────────────────────────────────────────────── */
footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
}
.footer-link { color: var(--c-text2); text-decoration: none; font-size: 0.85rem; transition: color 0.2s; }
.footer-link:hover { color: var(--c-primary); }
.social-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text2);
  transition: var(--transition);
  text-decoration: none;
  font-size: 0.9rem;
}
.social-icon:hover { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }

/* ── INPUT in header search ──────────────────────────────── */
.search-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.search-input-wrap .fa {
  position: absolute;
  left: 0.7rem;
  color: var(--c-text3);
  font-size: 0.8rem;
}
#search-input {
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 0.45rem 0.8rem 0.45rem 2rem;
  color: var(--c-text);
  font-size: 0.8rem;
  font-family: 'Inter', sans-serif;
  width: 180px;
  transition: width 0.3s, border-color 0.2s;
}
#search-input:focus { outline: none; border-color: var(--c-primary); width: 220px; }