:root {
  --bg: #020617;
  --panel: rgba(15, 23, 42, 0.75);
  --border: rgba(255, 255, 255, 0.08);
  --accent: #f59e0b;
  --accent-soft: rgba(245, 158, 11, 0.15);
  --text: #cbd5f5;
  --muted: #7b8399;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at 20% 20%, rgba(245, 158, 11, 0.08), transparent 25%),
              radial-gradient(circle at 80% 10%, rgba(59, 130, 246, 0.08), transparent 30%),
              radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.06), transparent 35%),
              var(--bg);
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
}

.hero {
  padding: 72px 16px 56px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(140deg, rgba(245, 158, 11, 0.08), rgba(15, 23, 42, 0.85));
}

.hero__inner {
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
}

.pill {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 12px 0 8px;
  font-size: clamp(32px, 8vw, 64px);
  letter-spacing: -0.02em;
  color: #e5e7eb;
}

.hero__logo {
  margin: 12px auto 8px;
  max-width: 520px;
}

.hero__logo img {
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 16px 32px rgba(0, 0, 0, 0.4));
}

.accent {
  color: var(--accent);
}

.accent-alt {
  color: #fbbf24;
  font-style: italic;
}

.tagline {
  margin: 0;
  color: var(--muted);
}

.meta {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 96px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}

.intro {
  display: grid;
  gap: 16px;
}

.lead {
  margin: 0;
  line-height: 1.6;
  color: #e5e7eb;
}

.small {
  color: var(--muted);
  font-size: 13px;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.section-head h3 {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.note {
  color: var(--muted);
  font-size: 12px;
}

.concept {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.concept__summary {
  font-size: 24px;
  font-weight: 600;
  color: #e5e7eb;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.concept__summary::-webkit-details-marker {
  display: none;
}

.concept__summary::after {
  content: "+";
  font-size: 20px;
  color: var(--muted);
  transition: transform 0.2s ease, color 0.2s ease;
}

.concept[open] .concept__summary::after {
  content: "–";
  color: #e5e7eb;
}

.concept__body {
  margin-top: 6px;
}

.faq {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.02);
}

.faq-question {
  margin: 0;
  font-size: 18px;
  color: #e5e7eb;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "+";
  font-size: 18px;
  color: var(--muted);
  transition: transform 0.2s ease, color 0.2s ease;
}

.faq-item[open] .faq-question::after {
  content: "–";
  color: #e5e7eb;
}

.faq-answer {
  color: var(--text);
  line-height: 1.6;
}

.faq-answer ol {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.faq-answer li {
  color: #d2d7e6;
}

.track-list {
  display: grid;
  gap: 12px;
}

.track {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.track__cover {
  width: 96px;
  height: 96px;
  border-radius: 8px;
  overflow: hidden;
  background: #0f172a;
  border: 1px solid var(--border);
}

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

.track__title {
  margin: 0;
  font-size: 18px;
  color: #e5e7eb;
}

.track__subtitle {
  margin: 2px 0 8px;
  color: var(--accent);
  font-size: 14px;
}

.track__desc {
  margin: 0 0 8px;
  color: var(--muted);
  line-height: 1.4;
  font-size: 14px;
}

.track__meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 12px;
}

.track__actions {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 8px;
}

.btn {
  padding: 8px 12px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
}

.btn.secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
}

.btn:hover {
  transform: translateY(-1px);
}

.footer {
  padding: 24px 16px 32px;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.llm-manifesto {
  max-width: 820px;
  margin: 16px auto 0;
  opacity: 0.6;
}

.llm-manifesto__title {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.llm-manifesto__text {
  margin: 0;
  font-size: 12px;
  line-height: 1.5;
  color: #b7bdcf;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.player {
  position: fixed;
  bottom: 12px;
  left: 12px;
  right: 12px;
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  background: rgba(2, 6, 23, 0.85);
  border: 1px solid var(--border);
  align-items: center;
  backdrop-filter: blur(8px);
}

.player.hidden {
  display: none;
}

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

.cover {
  width: 56px;
  height: 56px;
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: 8px;
  background-size: cover;
  background-position: center;
}

.player__title {
  font-weight: 600;
}

.player__subtitle {
  color: var(--muted);
  font-size: 12px;
}

.player__controls button {
  background: var(--panel);
  border: 1px solid var(--border);
  color: #fff;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
}

.player__controls button:hover {
  border-color: var(--accent);
}

.player__progress {
  display: grid;
  grid-template-columns: 50px 1fr 50px;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}

input[type="range"] {
  width: 100%;
}

.chat {
  position: fixed;
  bottom: 110px;
  right: 16px;
  z-index: 20;
}

.chat__toggle {
  padding: 10px 14px;
  background: var(--accent);
  color: #0f172a;
  border: none;
  border-radius: 20px;
  cursor: pointer;
  font-weight: 700;
}

.chat__window {
  width: min(360px, 90vw);
  height: 520px;
  background: rgba(2, 6, 23, 0.95);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.chat__window.hidden {
  display: none;
}

.chat__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.chat__title {
  font-weight: 600;
}

.chat__subtitle {
  color: var(--muted);
  font-size: 12px;
}

.chat__log {
  padding: 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chat__spinner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--muted);
}

.chat__spinner.hidden {
  display: none;
}

.spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.chat__bubble {
  padding: 10px 12px;
  border-radius: 10px;
  max-width: 85%;
  line-height: 1.4;
}

.chat__bubble.user {
  align-self: flex-end;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: #fff;
}

.chat__bubble.bot {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text);
}

.chat__form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
}

.chat__form input {
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  color: #fff;
}

.chat__form button {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #0f172a;
  cursor: pointer;
}

@media (max-width: 640px) {
  .track {
    grid-template-columns: 1fr;
  }

  .player {
    grid-template-columns: 1fr;
  }
}