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

:root {
  --bg:        #f5f5f7;
  --surface:   #ffffff;
  --border:    #e0e0e5;
  --text-1:    #1d1d1f;
  --text-2:    #6e6e73;
  --text-3:    #aeaeb2;
  --accent:    #4a4a8a;
  --accent-lt: #eeeef8;
  --radius:    16px;
  --radius-sm: 10px;
  --shadow:    0 2px 16px rgba(0,0,0,0.07);
  --shadow-hv: 0 8px 32px rgba(0,0,0,0.13);
  --nav-h:     58px;
  --font:      'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Semester colors */
  --sem1:      #4a6cf7;
  --sem1-lt:   #eef1fe;
  --sem2:      #0d9488;
  --sem2-lt:   #ecfdf5;
  --sem3:      #d97706;
  --sem3-lt:   #fffbeb;
  --sem4:      #e11d48;
  --sem4-lt:   #fff1f2;
  --sem5:      #7c3aed;
  --sem5-lt:   #f3f0ff;
  --sem6:      #0891b2;
  --sem6-lt:   #ecfeff;
}

/* ── DARK MODE ── */
[data-theme="dark"] {
  --bg:        #0a0a0f;
  --surface:   #16161b;
  --border:    #27272a;
  --text-1:    #fafafa;
  --text-2:    #a1a1aa;
  --text-3:    #52525b;
  --accent:    #8b8bda;
  --accent-lt: #1e1e3a;
  --shadow:    0 2px 16px rgba(0,0,0,0.3);
  --shadow-hv: 0 8px 32px rgba(0,0,0,0.45);

  --sem1-lt:   #1a1f3a;
  --sem2-lt:   #0f2a25;
  --sem3-lt:   #2a1f0a;
  --sem4-lt:   #2a0f18;
  --sem5-lt:   #1f162e;
  --sem6-lt:   #0f252a;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-1);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

a { text-decoration: none; color: inherit; }

/* ── PAGE TRANSITIONS ── */
body {
  opacity: 1;
  transition: opacity 0.2s ease, background 0.3s ease, color 0.3s ease;
}

body.fade-out {
  opacity: 0;
}

/* ── NAV ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(245,245,247,0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .nav {
  background: rgba(10,10,15,0.82);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.3px;
  color: var(--text-1);
}
.nav-logo span {
  color: var(--accent);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-telegram {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-lt);
  padding: 7px 15px;
  border-radius: 999px;
  transition: background 0.2s, transform 0.15s;
}
.nav-telegram:hover {
  background: #ddddf2;
  transform: translateY(-1px);
}

[data-theme="dark"] .nav-telegram:hover {
  background: #2a2a4a;
}

/* ── DARK MODE TOGGLE ── */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
  color: var(--text-2);
  flex-shrink: 0;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  color: var(--accent);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform 0.3s ease;
}

.theme-toggle:hover svg {
  transform: rotate(20deg);
}

.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: none; }

/* ── HERO ── */
.hero {
  padding: 80px 24px 50px;
  text-align: center;
  background: linear-gradient(135deg, #eef0ff 0%, #f5f5f7 40%, #fef0f5 70%, #f0f5fe 100%);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  transition: background 0.3s ease;
}

[data-theme="dark"] .hero {
  background: linear-gradient(135deg, #0d0d1a 0%, #0a0a0f 40%, #150a10 70%, #0a0f15 100%);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-inner {
  max-width: 640px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 700;
  letter-spacing: -1.5px;
  line-height: 1.08;
  color: var(--text-1);
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 17px;
  font-weight: 400;
  color: var(--text-2);
  line-height: 1.6;
}

/* ── HERO STATS ── */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.hero-stat {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
}

.hero-stat-num {
  font-weight: 700;
  color: var(--text-1);
  font-size: 18px;
}

.hero-stat-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-3);
}

/* ── SEARCH BAR ── */
.search-wrap {
  max-width: 480px;
  margin: 28px auto 0;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 12px 18px 12px 44px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-1);
  font-family: var(--font);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.3s;
}

.search-input::placeholder {
  color: var(--text-3);
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74,74,138,0.1);
}

[data-theme="dark"] .search-input:focus {
  box-shadow: 0 0 0 3px rgba(139,139,218,0.15);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  pointer-events: none;
  transition: color 0.2s;
}

.search-input:focus ~ .search-icon {
  color: var(--accent);
}

.search-kbd {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-3);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 5px;
  pointer-events: none;
  transition: opacity 0.2s;
}

.search-input:focus ~ .search-kbd {
  opacity: 0;
}

/* ── SEMESTER TABS ── */
.semester-tabs {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 24px 0;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.sem-tab {
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font);
}

.sem-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.sem-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── MAIN ── */
.main {
  padding: 28px 24px 80px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

/* ── NO RESULTS ── */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-3);
  font-size: 15px;
  display: none;
}

.no-results.visible {
  display: block;
}

.no-results-icon {
  font-size: 40px;
  margin-bottom: 12px;
}

/* ── SEMESTER SECTION ── */
.semester-section {
  margin-bottom: 56px;
}

.semester-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

/* ── SCROLL ANIMATIONS ── */
.fade-in-up {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── PLAYLIST CARDS (Homepage) ── */
.playlist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.playlist-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, background 0.25s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
}

.playlist-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
  border-radius: var(--radius) var(--radius) 0 0;
}

.playlist-card:hover::before {
  transform: scaleX(1);
}

.playlist-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hv);
  border-color: transparent;
}

/* Semester-specific card top bar colors */
.playlist-card[data-sem="1"]::before { background: var(--sem1); }
.playlist-card[data-sem="2"]::before { background: var(--sem2); }
.playlist-card[data-sem="3"]::before { background: var(--sem3); }
.playlist-card[data-sem="4"]::before { background: var(--sem4); }
.playlist-card[data-sem="5"]::before { background: var(--sem5); }
.playlist-card[data-sem="6"]::before { background: var(--sem6); }

.playlist-card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  width: fit-content;
  transition: background 0.3s, color 0.3s;
}

/* Semester-specific tag colors */
.playlist-card-tag[data-sem="1"] { color: var(--sem1); background: var(--sem1-lt); }
.playlist-card-tag[data-sem="2"] { color: var(--sem2); background: var(--sem2-lt); }
.playlist-card-tag[data-sem="3"] { color: var(--sem3); background: var(--sem3-lt); }
.playlist-card-tag[data-sem="4"] { color: var(--sem4); background: var(--sem4-lt); }
.playlist-card-tag[data-sem="5"] { color: var(--sem5); background: var(--sem5-lt); }
.playlist-card-tag[data-sem="6"] { color: var(--sem6); background: var(--sem6-lt); }

.playlist-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.4;
  letter-spacing: -0.2px;
}

.playlist-card-meta {
  font-size: 13px;
  color: var(--text-2);
  margin-top: auto;
  padding-top: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}


.playlist-card-arrow {
  font-size: 13px;
  color: var(--text-3);
  transition: color 0.2s, transform 0.2s;
}
.playlist-card:hover .playlist-card-arrow {
  color: var(--accent);
  transform: translateX(4px);
}

/* ── PLAYLIST PAGE HERO ── */
.playlist-hero {
  padding: 48px 24px 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
  transition: border-color 0.3s;
}

.back-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 20px;
  transition: opacity 0.15s;
}
.back-link:hover { opacity: 0.7; }

.playlist-title {
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1.15;
  margin: 8px 0 12px;
}

.playlist-count {
  font-size: 14px;
  color: var(--text-2);
}

/* ── VIDEO GRID ── */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

/* ── VIDEO CARD ── */
.video-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, background 0.3s;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hv);
  border-color: transparent;
}

.video-thumb-wrap {
  display: block;
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #000;
  cursor: pointer;
}

.video-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease, opacity 0.4s ease;
  opacity: 0;
}

.video-thumb-wrap img.loaded {
  opacity: 1;
}

.video-card:hover .video-thumb-wrap img {
  transform: scale(1.03);
}

/* ── SKELETON LOADING ── */
.skeleton-thumb {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--border) 25%, var(--bg) 50%, var(--border) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease infinite;
}

.skeleton-thumb.hidden {
  display: none;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.25);
  opacity: 0;
  transition: opacity 0.2s;
}

.video-card:hover .play-btn { opacity: 1; }

.play-btn svg {
  width: 48px;
  height: 48px;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.4));
}

.video-info {
  padding: 18px 18px 16px;
}

.video-number {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 6px;
}

.video-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.45;
  letter-spacing: -0.1px;
  margin-bottom: 14px;
}

/* ── NOTES-ONLY THUMBNAIL ── */
.notes-only-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent-lt);
  text-decoration: none;
  width: 100%;
  height: 100%;
  aspect-ratio: 16/9;
  transition: background 0.2s;
}

.notes-only-thumb:hover {
  background: #ddddf2;
}

[data-theme="dark"] .notes-only-thumb:hover {
  background: #2a2a4a;
}

.notes-only-thumb svg {
  width: 32px;
  height: 32px;
  color: var(--accent);
}

.notes-only-thumb span {
  color: var(--accent);
  font-weight: 600;
  font-size: 14px;
}

/* ── PDF BUTTON ── */
.pdf-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-lt);
  border: none;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  text-decoration: none;
  font-family: var(--font);
}

.pdf-btn:hover {
  background: #ddddf2;
  transform: translateY(-1px);
}

[data-theme="dark"] .pdf-btn:hover {
  background: #2a2a4a;
}

.pdf-btn svg {
  flex-shrink: 0;
}

/* ── BACK TO TOP ── */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 90;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.2s, border-color 0.2s, color 0.2s;
  box-shadow: var(--shadow);
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

/* ── FOOTER ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  transition: border-color 0.3s;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-2);
}

.footer-inner a {
  color: var(--accent);
  font-weight: 500;
  transition: opacity 0.15s;
}
.footer-inner a:hover { opacity: 0.7; }

/* ── RESPONSIVE ── */
@media (max-width: 700px) {
  .hero { padding: 60px 20px 40px; }
  .playlist-grid { grid-template-columns: 1fr; gap: 10px; }
  .video-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
  .hero-stats { gap: 12px; }
  .semester-tabs { padding: 16px 20px 0; }
  .sem-tab { padding: 6px 12px; font-size: 12px; }
  .search-kbd { display: none; }
  .back-to-top { bottom: 18px; right: 18px; width: 38px; height: 38px; }
  .playlist-card { padding: 16px 18px; gap: 6px; }
  .playlist-card-title { font-size: 14px; }
  .playlist-card-tag { font-size: 10px; padding: 3px 8px; }
  .playlist-card-meta { font-size: 12px; }
  .playlist-card-arrow { font-size: 12px; }
  .semester-section { margin-bottom: 36px; }
}

/* ── NEW FEATURES (SEARCH HIGHLIGHTS) ── */
mark {
  background: rgba(74, 108, 247, 0.2);
  color: var(--text-1);
  padding: 0 2px;
  border-radius: 3px;
}
[data-theme="dark"] mark {
  background: rgba(139, 139, 218, 0.3);
  color: var(--text-1);
}

/* ── NEW FEATURES (PROGRESS TRACKING) ── */
.progress-wrap {
  margin-top: 10px;
}
.progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 4px;
}
.progress-fill {
  height: 100%;
  background: var(--sem1);
  width: 0%;
  transition: width 0.4s ease;
}
[data-sem="2"] .progress-fill { background: var(--sem2); }
[data-sem="3"] .progress-fill { background: var(--sem3); }
[data-sem="4"] .progress-fill { background: var(--sem4); }
[data-sem="5"] .progress-fill { background: var(--sem5); }
[data-sem="6"] .progress-fill { background: var(--sem6); }

.progress-text {
  font-size: 11px;
  color: var(--text-3);
  font-weight: 500;
}

.video-checkbox-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
}
.video-checkbox {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--text-3);
  border-radius: 4px;
  outline: none;
  cursor: pointer;
  display: grid;
  place-content: center;
  transition: all 0.2s;
}
.video-checkbox::before {
  content: "";
  width: 10px;
  height: 10px;
  transform: scale(0);
  box-shadow: inset 1em 1em white;
  transform-origin: center;
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
  transition: 120ms transform ease-in-out;
}
.video-checkbox:checked {
  background-color: var(--sem2);
  border-color: var(--sem2);
}
.video-checkbox:checked::before {
  transform: scale(1);
}
.video-checkbox-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
}
.video-checkbox:checked ~ .video-checkbox-label {
  color: var(--text-1);
}

/* ── NEW FEATURES (SHARE BUTTON) ── */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-1);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 12px;
}
.share-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── VIEW TRANSITIONS ── */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.3s;
}

/* ── NEW FEATURES (SYLLABUS) ── */
.syllabus-section {
  margin-bottom: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.syllabus-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  font-family: var(--font);
  cursor: pointer;
  padding: 4px 0;
}

.syllabus-toggle-btn .chevron {
  transition: transform 0.3s ease;
  color: var(--text-3);
}

.syllabus-toggle-btn.expanded .chevron {
  transform: rotate(180deg);
}

.syllabus-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, margin-top 0.4s ease, opacity 0.4s ease;
  opacity: 0;
}

.syllabus-content.expanded {
  max-height: 2000px; /* arbitrary large value to fit content */
  margin-top: 20px;
  opacity: 1;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.syllabus-unit {
  margin-bottom: 20px;
}

.syllabus-unit:last-child {
  margin-bottom: 0;
}

.syllabus-unit-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 8px;
  line-height: 1.4;
}

.syllabus-topics {
  list-style-type: disc;
  padding-left: 20px;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.6;
}

.syllabus-topics li {
  margin-bottom: 4px;
}

/* ── PWA INSTALL BANNER ── */
.install-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  transform: translateY(100%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 0 16px 16px;
  pointer-events: none;
}

.install-banner.visible {
  transform: translateY(0);
  pointer-events: auto;
}

.install-banner-content {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow-hv);
  max-width: 480px;
  margin: 0 auto;
}

.install-banner-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 14px;
}

.install-banner-text strong {
  color: var(--text-1);
  font-weight: 600;
}

.install-banner-text span {
  color: var(--text-2);
  font-size: 13px;
}

.install-banner-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 18px;
  border-radius: 999px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
  white-space: nowrap;
}

.install-banner-btn:hover {
  opacity: 0.85;
}

.install-banner-close {
  background: none;
  border: none;
  font-size: 22px;
  color: var(--text-3);
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color 0.2s;
}

.install-banner-close:hover {
  color: var(--text-1);
}

.install-banner-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.install-banner-icon svg {
  display: block;
}