/* ── 科技漸層活潑 theme ───────────────────────────────────────────────── */
:root {
  --bg: #08080d;
  --bg-soft: #0f0f17;
  --card: rgba(22, 22, 33, 0.66);
  --card-brd: rgba(255, 255, 255, 0.08);
  --txt: #f4f4f8;
  --txt-dim: #a3a3b8;
  --txt-faint: #6c6c82;

  --accent: #d97757;        /* Claude orange */
  --c-purple: #7c3aed;
  --c-blue: #2563eb;
  --c-cyan: #06b6d4;
  --c-pink: #ec4899;

  --grad-brand: linear-gradient(120deg, #f97316, #ec4899 45%, #7c3aed 75%, #2563eb);
  --radius: 16px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
  --maxw: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Noto Sans TC", "Space Grotesk", system-ui, sans-serif;
  background: var(--bg);
  color: var(--txt);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  overflow-x: hidden;
}

h1, h2, h3, .hero__title { font-family: "Space Grotesk", "Noto Sans TC", sans-serif; }

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

/* ── Buttons ──────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 0.4em;
  font-weight: 700; font-size: 0.92rem;
  padding: 0.6rem 1.15rem; border: none; border-radius: 999px;
  cursor: pointer; transition: transform 0.15s ease, box-shadow 0.2s ease, opacity 0.2s;
}
.btn:hover { transform: translateY(-2px); }
.btn--sub { background: rgba(255, 255, 255, 0.1); color: var(--txt); }
.btn--sub:hover { background: rgba(255, 255, 255, 0.18); }
.btn--cta {
  background: var(--grad-brand); color: #fff;
  box-shadow: 0 8px 26px rgba(236, 72, 153, 0.4);
  font-size: 1rem; padding: 0.75rem 1.6rem;
}
.btn--cta:hover { box-shadow: 0 12px 34px rgba(124, 58, 237, 0.5); }

/* ── Topbar ───────────────────────────────────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(8, 8, 13, 0.7);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--card-brd);
}
.topbar__brand { display: flex; align-items: center; gap: 0.55rem; font-weight: 700; letter-spacing: 0.3px; }
.topbar__dot { width: 11px; height: 11px; border-radius: 50%; background: var(--grad-brand); box-shadow: 0 0 14px rgba(236,72,153,.8); }

/* ── Hero ─────────────────────────────────────────────────────────────── */
.hero { position: relative; overflow: hidden; padding: clamp(2.5rem, 7vw, 5.5rem) clamp(1rem, 4vw, 2.5rem); }
.hero__bg { position: absolute; inset: 0; z-index: 0; filter: blur(60px); opacity: 0.6; }
.blob { position: absolute; border-radius: 50%; mix-blend-mode: screen; animation: float 16s ease-in-out infinite; }
.blob--1 { width: 420px; height: 420px; background: var(--c-purple); top: -120px; left: -60px; }
.blob--2 { width: 360px; height: 360px; background: var(--c-blue); top: -40px; right: -40px; animation-delay: -5s; }
.blob--3 { width: 320px; height: 320px; background: var(--accent); bottom: -160px; left: 35%; animation-delay: -9s; }
@keyframes float { 0%,100% { transform: translate(0,0) scale(1); } 33% { transform: translate(40px,30px) scale(1.1); } 66% { transform: translate(-30px,20px) scale(0.95); } }

.hero__inner {
  position: relative; z-index: 1;
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; gap: clamp(1.25rem, 4vw, 2.75rem); flex-wrap: wrap;
}
.hero__avatar {
  width: clamp(96px, 16vw, 150px); height: clamp(96px, 16vw, 150px);
  border-radius: 50%; object-fit: cover; flex-shrink: 0;
  border: 3px solid transparent;
  background: var(--grad-brand) border-box;
  box-shadow: 0 0 0 4px rgba(8,8,13,.9), 0 12px 40px rgba(124,58,237,.35);
}
.hero__avatar:not([src]) { visibility: hidden; }
.hero__title { font-size: clamp(2rem, 6vw, 3.4rem); font-weight: 700; line-height: 1.05; }
.hero__tagline { color: var(--txt-dim); font-size: clamp(1rem, 2.5vw, 1.25rem); margin-top: 0.5rem; }
.hero__stats { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1.1rem 0 1.4rem; }
.stat {
  display: inline-flex; align-items: baseline; gap: 0.4em;
  background: rgba(255,255,255,0.06); border: 1px solid var(--card-brd);
  padding: 0.4rem 0.85rem; border-radius: 999px; font-size: 0.85rem; color: var(--txt-dim);
}
.stat b { color: var(--txt); font-size: 1rem; }

/* ── Controls ─────────────────────────────────────────────────────────── */
.controls {
  position: sticky; top: 56px; z-index: 30;
  background: rgba(8, 8, 13, 0.72); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--card-brd);
}
.controls__inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; gap: 0.85rem; align-items: center; flex-wrap: wrap;
  padding: 0.8rem clamp(1rem, 4vw, 2.5rem);
}
.search { position: relative; flex: 1; min-width: 200px; }
.search__icon { position: absolute; left: 0.85rem; top: 50%; transform: translateY(-50%); width: 18px; height: 18px; color: var(--txt-faint); }
.search input {
  width: 100%; padding: 0.65rem 1rem 0.65rem 2.55rem;
  background: rgba(255,255,255,0.05); border: 1px solid var(--card-brd);
  border-radius: 999px; color: var(--txt); font: inherit; font-size: 0.95rem;
}
.search input:focus { outline: none; border-color: var(--c-purple); box-shadow: 0 0 0 3px rgba(124,58,237,.25); }
.sort { display: flex; background: rgba(255,255,255,0.05); border: 1px solid var(--card-brd); border-radius: 999px; padding: 3px; }
.sort__btn { border: none; background: transparent; color: var(--txt-dim); font: inherit; font-weight: 600; padding: 0.45rem 1.05rem; border-radius: 999px; cursor: pointer; transition: 0.2s; }
.sort__btn.is-active { background: var(--grad-brand); color: #fff; }

/* ── Grid ─────────────────────────────────────────────────────────────── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1rem, 4vw, 2.5rem) 3rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 1.4rem; }

.card {
  position: relative; background: var(--card); border: 1px solid var(--card-brd);
  border-radius: var(--radius); overflow: hidden; cursor: pointer;
  backdrop-filter: blur(8px);
  transition: transform 0.22s ease, box-shadow 0.25s ease, border-color 0.25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(124,58,237,.55); }
.card__thumbwrap { position: relative; aspect-ratio: 16/9; overflow: hidden; background: var(--bg-soft); }
.card__thumb { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.card:hover .card__thumb { transform: scale(1.06); }
.card__play {
  position: absolute; inset: 0; display: grid; place-items: center;
  opacity: 0; transition: opacity 0.25s; background: rgba(8,8,13,0.25);
}
.card:hover .card__play { opacity: 1; }
.card__play span {
  width: 56px; height: 56px; border-radius: 50%; display: grid; place-items: center;
  background: var(--grad-brand); color: #fff; font-size: 1.3rem; padding-left: 4px;
  box-shadow: 0 6px 20px rgba(236,72,153,.5);
}
.card__body { padding: 0.85rem 1rem 1.05rem; }
.card__title { font-size: 0.98rem; font-weight: 700; line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card__meta { margin-top: 0.5rem; color: var(--txt-faint); font-size: 0.8rem; display: flex; gap: 0.6rem; flex-wrap: wrap; }

/* ── Status / fallback ────────────────────────────────────────────────── */
.status { color: var(--txt-dim); text-align: center; padding: 2rem 1rem; font-size: 0.95rem; }
.status a { color: var(--accent); text-decoration: underline; }
.status--error { color: #fca5a5; }
.skeleton { background: var(--card); border: 1px solid var(--card-brd); border-radius: var(--radius); overflow: hidden; }
.skeleton .sk { aspect-ratio: 16/9; background: linear-gradient(90deg, #14141d, #1d1d29, #14141d); background-size: 200% 100%; animation: shimmer 1.3s infinite; }
.skeleton .sk-line { height: 14px; margin: 0.85rem 1rem; border-radius: 6px; background: linear-gradient(90deg, #14141d, #1d1d29, #14141d); background-size: 200% 100%; animation: shimmer 1.3s infinite; }
.skeleton .sk-line.short { width: 55%; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ── About / FAQ (SEO + GEO) ──────────────────────────────────────────── */
.about { border-top: 1px solid var(--card-brd); }
.about__inner { max-width: 880px; margin: 0 auto; padding: clamp(2rem, 5vw, 3.5rem) clamp(1rem, 4vw, 2.5rem); }
.about__h { font-size: 1.35rem; font-weight: 700; margin: 1.6rem 0 0.9rem; background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.about__h:first-child { margin-top: 0; }
.about__p { color: var(--txt-dim); line-height: 1.85; font-size: 0.97rem; }
.about__p strong { color: var(--txt); }
.faq details { background: var(--card); border: 1px solid var(--card-brd); border-radius: 12px; padding: 0.2rem 1.1rem; margin-bottom: 0.7rem; backdrop-filter: blur(8px); }
.faq summary { cursor: pointer; font-weight: 600; padding: 0.85rem 0; list-style: none; color: var(--txt); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "＋"; color: var(--accent); font-weight: 700; margin-right: 0.6rem; }
.faq details[open] summary::before { content: "－"; }
.faq details[open] summary { color: var(--accent); }
.faq details p { color: var(--txt-dim); line-height: 1.8; font-size: 0.92rem; padding: 0 0 1rem 1.6rem; margin: 0; }

/* ── Footer ───────────────────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--card-brd); text-align: center; color: var(--txt-faint); font-size: 0.85rem; padding: 2rem 1rem; }

/* ── Modal ────────────────────────────────────────────────────────────── */
.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 1.25rem; }
.modal[hidden] { display: none; }
.modal__backdrop { position: absolute; inset: 0; background: rgba(4,4,8,0.82); backdrop-filter: blur(6px); }
.modal__panel { position: relative; width: min(960px, 100%); background: var(--bg-soft); border: 1px solid var(--card-brd); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; animation: pop 0.22s ease; }
@keyframes pop { from { transform: scale(0.96); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal__video { aspect-ratio: 16/9; background: #000; }
.modal__video iframe { width: 100%; height: 100%; border: 0; display: block; }
.modal__title { padding: 1rem 1.25rem 1.25rem; font-size: 1.05rem; font-weight: 700; }
.modal__close { position: absolute; top: 0.6rem; right: 0.6rem; z-index: 2; width: 38px; height: 38px; border-radius: 50%; border: none; background: rgba(8,8,13,0.7); color: #fff; font-size: 1rem; cursor: pointer; transition: 0.2s; }
.modal__close:hover { background: var(--accent); }

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .hero__inner { flex-direction: column; text-align: center; }
  .hero__stats { justify-content: center; }
  .grid { grid-template-columns: 1fr; }
  .controls { top: 53px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}