:root {
  --page-bg: #040711;
  --surface: rgba(10, 14, 29, 0.9);
  --surface-strong: rgba(8, 11, 24, 0.96);
  --surface-soft: rgba(12, 17, 34, 0.75);
  --text: #f7f9ff;
  --muted: #a6b0d6;
  --line: rgba(102, 189, 255, 0.18);
  --line-strong: rgba(90, 225, 255, 0.36);
  --cyan: #57ebff;
  --violet: #8c6cff;
  --pink: #ff4fbf;
  --youtube: #ff1744;
  --header-height: 112px;
  --mouse-x: 50%;
  --mouse-y: 50%;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-width: 320px;
  min-height: 100%;
  background: radial-gradient(circle at top, #0d1430 0%, #060914 38%, #040711 100%);
}

html {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  color: var(--text);
  overflow-x: hidden;
}

body::before {
  position: fixed;
  inset: 0;
  content: "";
  pointer-events: none;
  background-image:
    linear-gradient(rgba(86, 214, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(86, 214, 255, 0.03) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.75), rgba(0,0,0,.22) 45%, transparent);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 14px;
  left: 14px;
  padding: 10px 14px;
  border: 1px solid var(--cyan);
  border-radius: 12px;
  background: #07101f;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 180ms ease;
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: var(--header-height);
  border-bottom: 1px solid rgba(91, 222, 255, 0.22);
  background:
    radial-gradient(circle at var(--mouse-x) var(--mouse-y), rgba(94, 88, 255, 0.14), transparent 24%),
    linear-gradient(90deg, rgba(6, 9, 20, 0.95), rgba(8, 12, 28, 0.95));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 14px 44px rgba(0, 0, 0, 0.35);
}

.site-header::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image:
    linear-gradient(rgba(94, 224, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(94, 224, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(90deg, rgba(0,0,0,.65), rgba(0,0,0,.25) 60%, transparent 96%);
  pointer-events: none;
}

.header-art {
  position: absolute;
  top: 50%;
  right: -2%;
  z-index: 0;
  width: min(72vw, 1120px);
  max-height: 190%;
  opacity: .92;
  pointer-events: none;
  transform: translate3d(0,-50%,0) scale(1.03);
  transform-origin: 75% 50%;
  transition: transform 220ms ease-out;
}

body.pointer-active .header-art {
  transform: translate3d(var(--art-shift-x,0), calc(-50% + var(--art-shift-y,0)), 0) scale(1.03);
}

.header-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: min(100%, 1700px);
  margin: 0 auto;
  padding: 18px clamp(18px, 3vw, 52px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 72px;
  height: 72px;
  filter: drop-shadow(0 0 18px rgba(78, 235, 255, 0.34));
  transition: transform 200ms ease, filter 200ms ease;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  display: block;
}

.brand:hover .brand-mark,
.brand:focus-visible .brand-mark {
  transform: translateY(-2px) scale(1.03);
  filter: drop-shadow(0 0 24px rgba(78, 235, 255, 0.48));
}

.brand-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 5px;
}

.brand-name {
  font-size: clamp(1.8rem, 2.8vw, 2.75rem);
  font-weight: 900;
  line-height: .95;
  letter-spacing: -.06em;
  white-space: nowrap;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.4);
}

.brand-name span {
  color: transparent;
  background: linear-gradient(135deg, var(--cyan), var(--violet) 45%, var(--pink));
  background-clip: text;
  -webkit-background-clip: text;
}

.brand-tagline {
  color: var(--muted);
  font-size: clamp(.58rem, .84vw, .78rem);
  font-weight: 760;
  letter-spacing: .16em;
  white-space: nowrap;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.language-switcher {
  display: inline-flex;
  padding: 3px;
  border: 1px solid rgba(120, 189, 255, .24);
  border-radius: 14px;
  background: rgba(7, 11, 24, 0.82);
  box-shadow: inset 0 1px rgba(255,255,255,.05), 0 10px 22px rgba(0,0,0,.22);
}

.language-button {
  min-width: 40px;
  min-height: 36px;
  padding: 0 12px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: #d7def8;
  font-weight: 800;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}

.language-button:hover,
.language-button:focus-visible { background: rgba(255,255,255,.06); outline: none; }
.language-button.is-active { color: #fff; background: linear-gradient(135deg, rgba(45,98,169,.7), rgba(86,53,171,.7)); }

.main-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 11px 15px;
  border: 1px solid rgba(137, 210, 255, 0.26);
  border-radius: 14px;
  text-decoration: none;
  color: #f7f9ff;
  font-size: .78rem;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: .08em;
  background: linear-gradient(135deg, rgba(14,24,48,.86), rgba(17,12,40,.74));
  box-shadow: 0 14px 30px rgba(0,0,0,.24), inset 0 1px rgba(255,255,255,.06);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  outline: none;
  transform: translateY(-2px);
  border-color: rgba(88, 230, 255, 0.68);
  box-shadow: 0 16px 34px rgba(0,0,0,.28), 0 0 18px rgba(80,232,255,.1), inset 0 1px rgba(255,255,255,.08);
}

.nav-link--youtube {
  background: linear-gradient(135deg, rgba(255,30,72,.96), rgba(201,0,66,.88));
  border-color: rgba(255,142,165,.42);
}

.nav-link--youtube:hover,
.nav-link--youtube:focus-visible {
  border-color: rgba(255,180,194,.6);
  box-shadow: 0 16px 34px rgba(124,0,33,.45), 0 0 24px rgba(255,55,92,.2), inset 0 1px rgba(255,255,255,.1);
}

.nav-link svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-link--youtube .youtube-icon { fill: #fff; stroke: none; }
.nav-link--youtube .youtube-play { fill: #ff1744; }
.external-arrow { line-height: 1; transition: transform 180ms ease; }
.nav-link:hover .external-arrow,
.nav-link:focus-visible .external-arrow { transform: translate(2px,-2px); }

.header-line {
  position: absolute;
  right: 0; left: 0; bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 22%, var(--violet) 54%, var(--pink) 80%, transparent);
  opacity: .82;
}

.page-main {
  width: min(100%, 1700px);
  margin: 0 auto;
  padding: 18px clamp(16px, 2.4vw, 40px) 28px;
}

.youtube-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(320px, .95fr);
  gap: 18px;
  align-items: start;
}

.player-panel,
.playlist-panel {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(12, 17, 35, 0.96), rgba(7, 11, 24, 0.94));
  box-shadow: 0 20px 48px rgba(0,0,0,.28), inset 0 1px rgba(255,255,255,.03);
}

.player-panel {
  padding: 18px;
}

.panel-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.panel-heading h1 {
  margin: 6px 0 8px;
  font-size: clamp(1.25rem, 1.8vw, 1.8rem);
  line-height: 1.15;
}

.panel-heading p {
  max-width: 68ch;
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.panel-kicker,
.playlist-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #dfe8ff;
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff476f;
  box-shadow: 0 0 12px rgba(255, 71, 111, 0.8);
}

.youtube-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 154, 180, .36);
  background: linear-gradient(135deg, rgba(255,30,72,.98), rgba(200,0,62,.92));
  color: #fff;
  text-decoration: none;
  font-weight: 850;
  box-shadow: 0 16px 36px rgba(122,0,30,.44), inset 0 1px rgba(255,255,255,.08);
  transition: transform 180ms ease, box-shadow 180ms ease;
  white-space: nowrap;
}

.youtube-cta:hover,
.youtube-cta:focus-visible {
  outline: none;
  transform: translateY(-2px);
  box-shadow: 0 18px 40px rgba(122,0,30,.5), 0 0 24px rgba(255,40,88,.22), inset 0 1px rgba(255,255,255,.12);
}

.youtube-cta svg { width: 20px; height: 20px; fill: #fff; }
.youtube-cta .youtube-play { fill: #ff1744; }
.cta-short { display: none; }

.player-shell {
  position: relative;
}

.player-badge {
  position: absolute;
  z-index: 2;
  top: 12px;
  left: 12px;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 999px;
  background: rgba(6, 10, 20, 0.8);
  color: #edf1ff;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 12px 26px rgba(0,0,0,.28);
}

.player-viewport {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  border: 1px solid rgba(94, 190, 255, 0.12);
  background: #000;
  aspect-ratio: 16 / 9;
}

.youtube-frame {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.playlist-panel {
  padding: 16px;
}

.playlist-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.playlist-head h2 {
  margin: 6px 0 0;
  font-size: 1.2rem;
}

.playlist-link {
  color: var(--cyan);
  text-decoration: none;
  font-weight: 700;
}

.playlist-link:hover,
.playlist-link:focus-visible { text-decoration: underline; outline: none; }

.playlist-status,
.playlist-error {
  padding: 14px 16px;
  border: 1px dashed rgba(107, 154, 255, 0.22);
  border-radius: 16px;
  background: rgba(12, 18, 36, 0.58);
  color: var(--muted);
  line-height: 1.5;
}

.playlist-error p { margin: 0; }

.playlist-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: min(74vh, 860px);
  margin: 0;
  padding: 0;
  list-style: none;
  overflow: auto;
}

.playlist-item { list-style: none; }

.playlist-button {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 12px;
  width: 100%;
  padding: 8px;
  border: 1px solid rgba(114, 157, 255, 0.14);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(17, 23, 44, 0.95), rgba(10, 15, 30, 0.95));
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.playlist-button:hover,
.playlist-button:focus-visible {
  outline: none;
  transform: translateY(-2px);
  border-color: rgba(90, 225, 255, 0.42);
  box-shadow: 0 18px 34px rgba(0,0,0,.22), 0 0 18px rgba(80,232,255,.08);
}

.playlist-button.is-active {
  border-color: rgba(255, 79, 121, 0.52);
  background: linear-gradient(180deg, rgba(34, 20, 40, 0.96), rgba(13, 15, 32, 0.96));
  box-shadow: 0 18px 34px rgba(0,0,0,.22), 0 0 22px rgba(255,59,108,.1);
}

.playlist-thumb {
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, rgba(45,63,111,.9), rgba(16,21,38,.9));
}

.playlist-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.playlist-thumb::after {
  position: absolute;
  inset: auto auto 8px 8px;
  width: 28px;
  height: 20px;
  content: "";
  border-radius: 8px;
  background: rgba(255, 22, 63, 0.96);
  box-shadow: 0 8px 14px rgba(110,0,30,.35);
}

.playlist-thumb::before {
  position: absolute;
  z-index: 1;
  left: 18px;
  bottom: 14px;
  content: "";
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid #fff;
}

.playlist-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 7px;
}

.playlist-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: #d5ddff;
  font-size: .68rem;
  font-weight: 780;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.playlist-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding: 0 8px;
  border-radius: 999px;
  background: rgba(93, 234, 255, 0.12);
  color: var(--cyan);
}

.playlist-button.is-active .playlist-index {
  background: rgba(255, 62, 104, 0.16);
  color: #ff8dab;
}

.playlist-date {
  color: var(--muted);
}

.playlist-title {
  display: -webkit-box;
  overflow: hidden;
  color: #f7f9ff;
  font-size: .98rem;
  font-weight: 760;
  line-height: 1.35;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.playlist-note {
  display: -webkit-box;
  overflow: hidden;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.45;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.is-hidden { display: none !important; }

@media (max-width: 1200px) {
  .youtube-layout {
    grid-template-columns: 1fr;
  }

  .playlist-list {
    max-height: none;
  }
}

@media (max-width: 760px) {
  :root { --header-height: 92px; }
  .header-inner {
    padding: 14px 14px;
    gap: 14px;
  }
  .header-art {
    right: -34%;
    width: 160vw;
    opacity: .72;
  }
  .brand-mark { width: 58px; height: 58px; }
  .brand-name { font-size: clamp(1.35rem, 6vw, 1.88rem); }
  .brand-tagline { font-size: .52rem; letter-spacing: .1em; max-width: 42vw; overflow: hidden; text-overflow: ellipsis; }
  .header-controls { gap: 8px; }
  .main-nav { gap: 8px; }
  .nav-link {
    min-width: 44px;
    justify-content: center;
    padding: 10px 12px;
  }
  .nav-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .external-arrow { display: none; }
  .panel-toolbar {
    flex-direction: column;
    align-items: stretch;
  }
  .youtube-cta {
    justify-content: center;
  }
  .cta-full { display: none; }
  .cta-short { display: inline; }
  .playlist-button {
    grid-template-columns: 116px minmax(0, 1fr);
  }
}

@media (max-width: 520px) {
  .brand-tagline { display: none; }
  .page-main { padding-left: 12px; padding-right: 12px; }
  .player-panel, .playlist-panel { border-radius: 20px; }
  .player-panel, .playlist-panel { padding: 14px; }
  .player-badge { top: 10px; left: 10px; font-size: .62rem; }
  .playlist-head { flex-direction: column; }
  .playlist-button {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}