@charset "UTF-8";

/* =========================================================
   AI-NEXUS  ·  智能交互风 (AI-Driven Interaction)
   暗色背景 + 霓虹蓝紫青 + 玻璃态 + 流畅动效
   ========================================================= */

:root {
  color-scheme: dark;

  --bg-0: #05060f;
  --bg-1: #0a0c1c;
  --bg-2: #0e1126;

  --glass: rgba(255, 255, 255, 0.05);
  --glass-strong: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(140, 160, 255, 0.18);
  --glass-border-hi: rgba(160, 190, 255, 0.4);

  --text: #eaf0ff;
  --text-muted: #9aa6c7;
  --text-dim: #6b769a;

  --neon-blue: #5b8cff;
  --neon-purple: #a855f7;
  --neon-cyan: #22d3ee;
  --neon-pink: #f472b6;

  --grad-ai: linear-gradient(120deg, #5b8cff 0%, #a855f7 50%, #22d3ee 100%);
  --grad-ai-soft: linear-gradient(120deg, rgba(91,140,255,.18), rgba(168,85,247,.18), rgba(34,211,238,.18));

  --shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 40px rgba(120, 120, 255, 0.25);
  --radius: 18px;
  --radius-lg: 26px;
  --blur: blur(20px);
  --maxw: 1240px;

  --font-disp: "Playfair Display", "Noto Serif SC", Georgia, serif;
  --font-sans: "Inter", "Source Sans 3", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg-0);
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Animated ambient background ---------- */
.ai-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1100px 700px at 12% 8%, rgba(91,140,255,.20), transparent 55%),
    radial-gradient(1000px 800px at 88% 12%, rgba(168,85,247,.18), transparent 55%),
    radial-gradient(1200px 900px at 50% 100%, rgba(34,211,238,.12), transparent 60%),
    linear-gradient(180deg, var(--bg-1), var(--bg-0) 60%);
}
.ai-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(140,160,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140,160,255,.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
  animation: gridFloat 24s linear infinite;
}
@keyframes gridFloat {
  from { background-position: 0 0, 0 0; }
  to   { background-position: 48px 48px, 48px 48px; }
}
.ai-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(70px);
  opacity: .5;
  z-index: -1;
  pointer-events: none;
  animation: orbDrift 18s ease-in-out infinite alternate;
}
.ai-orb.a { width: 420px; height: 420px; top: -120px; left: -80px; background: radial-gradient(circle, rgba(91,140,255,.55), transparent 70%); }
.ai-orb.b { width: 520px; height: 520px; bottom: -160px; right: -120px; background: radial-gradient(circle, rgba(168,85,247,.5), transparent 70%); animation-delay: -6s; }
.ai-orb.c { width: 360px; height: 360px; top: 40%; left: 60%; background: radial-gradient(circle, rgba(34,211,238,.4), transparent 70%); animation-delay: -11s; }
@keyframes orbDrift {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(40px,-30px) scale(1.12); }
}

/* ---------- Glass utility ---------- */
.glass {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius);
}

/* ---------- Navigation ---------- */
.ai-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px clamp(16px, 4vw, 48px);
  background: rgba(8, 10, 22, 0.55);
  border-bottom: 1px solid var(--glass-border);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.ai-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
}
.ai-logo-mark {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 11px;
  font-weight: 800;
  font-size: 15px;
  background: var(--grad-ai);
  color: #06081a;
  box-shadow: var(--shadow-glow);
}
.ai-logo-text {
  font-weight: 700;
  letter-spacing: .3px;
  font-size: 17px;
  background: linear-gradient(90deg, #fff, #c9d4ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.ai-nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0; padding: 0;
}
.ai-nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 10px;
  transition: color .25s, background .25s;
}
.ai-nav-links a:hover, .ai-nav-links a.active {
  color: var(--text);
  background: var(--glass-strong);
}
.ai-nav-right { display: flex; align-items: center; gap: 10px; }
.ai-btn {
  border: 1px solid var(--glass-border);
  background: var(--glass);
  color: var(--text);
  border-radius: 11px;
  padding: 9px 14px;
  font-size: 13px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: border-color .25s, transform .2s, box-shadow .25s;
  font-family: inherit;
}
.ai-btn:hover { border-color: var(--glass-border-hi); transform: translateY(-1px); box-shadow: var(--shadow-glow); }
.ai-btn.primary {
  background: var(--grad-ai);
  color: #06081a;
  font-weight: 700;
  border: none;
}
.ai-search-btn svg, .ai-btn svg { width: 16px; height: 16px; }
.ai-mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none; border: none; cursor: pointer; padding: 6px;
}
.ai-mobile-menu span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

/* ---------- Search overlay ---------- */
.ai-search-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(4, 6, 16, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
}
.ai-search-overlay.active { display: flex; }
.ai-search-box {
  width: min(640px, 90vw);
  background: var(--glass-strong);
  border: 1px solid var(--glass-border-hi);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.ai-search-box input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 20px;
  font-family: inherit;
}
.ai-search-box input::placeholder { color: var(--text-dim); }
.ai-search-results { margin-top: 14px; display: grid; gap: 8px; max-height: 50vh; overflow-y: auto; }
.ai-search-empty { color: var(--text-dim); font-size: 14px; padding: 10px 4px; }
.ai-search-item {
  display: flex; gap: 14px; align-items: center;
  padding: 10px; border-radius: 14px;
  text-decoration: none; color: var(--text);
  border: 1px solid transparent;
  transition: background .2s, border-color .2s;
}
.ai-search-item:hover { background: var(--glass); border-color: var(--glass-border); }
.ai-search-thumb { width: 56px; height: 56px; border-radius: 10px; object-fit: cover; flex: none; }
.ai-search-cat { font-size: 11px; letter-spacing: 1px; text-transform: uppercase; color: var(--neon-cyan); }
.ai-search-title { font-size: 14px; }
.ai-search-close {
  position: absolute; top: 22px; right: 26px;
  background: none; border: none; color: var(--text-muted);
  font-size: 30px; cursor: pointer; line-height: 1;
}

/* ---------- Hero ---------- */
.ai-wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(16px, 4vw, 48px); }
.ai-hero { padding: clamp(36px, 6vw, 72px) 0 28px; }
.ai-hero-inner {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 28px;
  align-items: stretch;
}
.ai-hero-feature {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 420px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--glass-border);
  background: var(--bg-2);
  display: block;
  transition: transform .4s, box-shadow .4s;
}
.ai-hero-feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.ai-hero-feature img {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
  opacity: .82;
  transition: transform .8s ease;
}
.ai-hero-feature:hover img { transform: scale(1.06); }
.ai-hero-feature::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(5,6,15,0) 20%, rgba(5,6,15,.85) 100%);
}
.ai-hero-body {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 30px;
}
.ai-tag {
  display: inline-block;
  font-size: 11px; letter-spacing: 1.5px; text-transform: uppercase;
  padding: 5px 12px; border-radius: 999px;
  background: var(--grad-ai-soft);
  border: 1px solid var(--glass-border-hi);
  color: #dfe6ff;
  margin-bottom: 14px;
}
.ai-hero-title {
  font-family: var(--font-disp);
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.12;
  margin: 0 0 12px;
  font-weight: 700;
}
.ai-hero-excerpt { color: #d4ddf5; font-size: 15px; margin: 0 0 16px; max-width: 52ch; }
.ai-hero-cta {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .5px;
  color: #fff;
}
.ai-hero-cta svg { width: 16px; height: 16px; transition: transform .25s; }
.ai-hero-feature:hover .ai-hero-cta svg { transform: translateX(4px); }

/* Side AI feed */
.ai-hero-side { display: flex; flex-direction: column; gap: 16px; }
.ai-side-card {
  display: flex; gap: 14px; align-items: center;
  padding: 14px; text-decoration: none; color: var(--text);
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  transition: transform .25s, border-color .25s, background .25s;
}
.ai-side-card:hover { transform: translateX(4px); border-color: var(--glass-border-hi); background: var(--glass-strong); }
.ai-side-thumb { width: 76px; height: 76px; border-radius: 12px; object-fit: cover; flex: none; }
.ai-side-cat { font-size: 10px; letter-spacing: 1px; text-transform: uppercase; color: var(--neon-purple); }
.ai-side-title { font-size: 14.5px; font-weight: 600; line-height: 1.35; }

/* ---------- Section heading ---------- */
.ai-section { padding: 34px 0; }
.ai-section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 22px; flex-wrap: wrap; }
.ai-section-label {
  font-size: 12px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--neon-cyan); margin-bottom: 6px;
}
.ai-section-title {
  font-family: var(--font-disp);
  font-size: clamp(22px, 2.6vw, 30px);
  margin: 0; font-weight: 700;
}
.ai-section-id { font-size: 12px; color: var(--text-dim); letter-spacing: 1px; }

/* ---------- Filter chips ---------- */
.ai-filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.ai-chip {
  border: 1px solid var(--glass-border);
  background: var(--glass);
  color: var(--text-muted);
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  transition: color .25s, border-color .25s, background .25s, box-shadow .25s;
}
.ai-chip:hover { color: var(--text); border-color: var(--glass-border-hi); }
.ai-chip.active {
  color: #06081a;
  background: var(--grad-ai);
  border-color: transparent;
  font-weight: 700;
  box-shadow: var(--shadow-glow);
}

/* ---------- News grid ---------- */
.ai-grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 22px;
}
.ai-card {
  position: relative;
  display: flex; flex-direction: column;
  text-decoration: none; color: var(--text);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  transition: transform .35s, border-color .35s, box-shadow .35s;
}
.ai-card::before {
  content: ""; position: absolute; inset: 0;
  background: var(--grad-ai);
  opacity: 0; transition: opacity .35s;
  z-index: 0; pointer-events: none;
  mix-blend-mode: overlay;
}
.ai-card:hover {
  transform: translateY(-6px);
  border-color: var(--glass-border-hi);
  box-shadow: var(--shadow-glow);
}
.ai-card:hover::before { opacity: .14; }
.ai-card-img { position: relative; aspect-ratio: 16/10; overflow: hidden; }
.ai-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.ai-card:hover .ai-card-img img { transform: scale(1.07); }
.ai-card-cat {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  font-size: 10px; letter-spacing: 1px; text-transform: uppercase;
  padding: 4px 10px; border-radius: 999px;
  background: rgba(6,8,20,.6);
  border: 1px solid var(--glass-border-hi);
  backdrop-filter: blur(6px);
  color: #dfe6ff;
}
.ai-card-body { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.ai-card-title { font-size: 17px; font-weight: 700; line-height: 1.32; margin: 0; }
.ai-card-excerpt { color: var(--text-muted); font-size: 13.5px; margin: 0; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.ai-card-meta { margin-top: auto; padding-top: 12px; font-size: 12px; color: var(--text-dim); display: flex; align-items: center; gap: 8px; }
.ai-card-meta .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--neon-cyan); }

/* ---------- AI Recommends band ---------- */
.ai-rec {
  border-radius: var(--radius-lg);
  padding: 28px;
  background: var(--grad-ai-soft);
  border: 1px solid var(--glass-border-hi);
  position: relative;
  overflow: hidden;
}
.ai-rec::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 200px at 90% 0%, rgba(168,85,247,.25), transparent 60%);
  pointer-events: none;
}
.ai-rec-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; position: relative; z-index: 1; }
.ai-rec-title { font-family: var(--font-disp); font-size: 22px; margin: 0; display: flex; align-items: center; gap: 10px; }
.ai-rec-title .pulse {
  width: 9px; height: 9px; border-radius: 50%; background: var(--neon-cyan);
  box-shadow: 0 0 0 0 rgba(34,211,238,.6); animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34,211,238,.5); }
  70% { box-shadow: 0 0 0 12px rgba(34,211,238,0); }
  100% { box-shadow: 0 0 0 0 rgba(34,211,238,0); }
}
.ai-rec-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; position: relative; z-index: 1; }
.ai-rec-item {
  display: flex; gap: 12px; align-items: center; text-decoration: none; color: var(--text);
  padding: 12px; border-radius: 14px;
  background: rgba(6,8,20,.4);
  border: 1px solid var(--glass-border);
  transition: transform .25s, border-color .25s;
}
.ai-rec-item:hover { transform: translateY(-3px); border-color: var(--glass-border-hi); }
.ai-rec-item img { width: 56px; height: 56px; border-radius: 10px; object-fit: cover; flex: none; }
.ai-rec-item .t { font-size: 13.5px; font-weight: 600; line-height: 1.35; }

/* ---------- Footer ---------- */
.ai-footer {
  margin-top: 60px;
  border-top: 1px solid var(--glass-border);
  background: rgba(6, 8, 20, 0.5);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.ai-footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 34px clamp(16px, 4vw, 48px); display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; align-items: center; }
.ai-footer-links { display: flex; gap: 18px; }
.ai-footer-links a, .ai-footer-text { color: var(--text-muted); text-decoration: none; font-size: 13px; }
.ai-footer-links a:hover { color: var(--text); }
.ai-footer-copy { width: 100%; font-size: 12px; color: var(--text-dim); border-top: 1px solid var(--glass-border); padding-top: 16px; }

/* ---------- Detail page ---------- */
.ai-detail { padding: 30px 0 60px; }
.ai-back {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--text-muted); text-decoration: none; font-size: 14px;
  margin-bottom: 22px; transition: color .25s, gap .25s;
}
.ai-back:hover { color: var(--text); gap: 12px; }
.ai-detail-hero { position: relative; border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 30px; border: 1px solid var(--glass-border); }
.ai-detail-hero img { width: 100%; max-height: 460px; object-fit: cover; display: block; }
.ai-detail-hero-cap { position: absolute; bottom: 0; left: 0; right: 0; padding: 30px; background: linear-gradient(180deg, transparent, rgba(5,6,15,.9)); }
.ai-detail-title { font-family: var(--font-disp); font-size: clamp(26px, 4vw, 44px); line-height: 1.15; margin: 0 0 10px; font-weight: 700; }
.ai-detail-body { max-width: 760px; margin: 0 auto; }
.ai-detail-lead { font-size: 19px; color: #d4ddf5; line-height: 1.7; margin: 0 0 26px; padding-left: 18px; border-left: 3px solid var(--neon-purple); }
.ai-detail-body h2 { font-family: var(--font-disp); font-size: 24px; margin: 34px 0 12px; }
.ai-detail-body p { color: var(--text-muted); font-size: 16px; line-height: 1.85; margin: 0 0 18px; }
.ai-detail-meta { display: flex; gap: 14px; flex-wrap: wrap; margin: 24px 0; }
.ai-meta-pill { font-size: 12px; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--glass-border); background: var(--glass); color: var(--text-muted); }

/* ---------- Reveal animation ---------- */
.ai-reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.ai-reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .ai-reveal { opacity: 1; transform: none; transition: none; }
  .ai-orb, .ai-grid { animation: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .ai-hero-inner { grid-template-columns: 1fr; }
  .ai-hero-feature { min-height: 320px; }
}
@media (max-width: 680px) {
  .ai-nav-links { display: none; }
  .ai-mobile-menu { display: flex; }
  .ai-grid-cards { grid-template-columns: 1fr; }
}