/* Tailwind CSS CDN（工具类基线） */
@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');

/* ═══════════ 智志AI 官网设计系统 ═══════════ */
:root {
  --c-primary: #4F7CFF;
  --c-violet: #8B5CF6;
  --c-cyan: #22D3EE;
  --c-bg-0: #0B0E1A;
  --c-bg-1: #111528;
  --c-bg-2: #161B33;
  --c-text: #F5F7FF;
  --c-text-dim: #9BA3C2;
  --c-ok: #22C55E;
  --c-err: #EF4444;
  --grad-main: linear-gradient(135deg, #4F7CFF 0%, #8B5CF6 55%, #22D3EE 100%);
  --grad-soft: linear-gradient(135deg, rgba(79,124,255,.16), rgba(139,92,246,.12) 55%, rgba(34,211,238,.10));
  --glass: rgba(22, 27, 51, .58);
  --glass-line: rgba(245, 247, 255, .09);
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 18px 50px rgba(3, 6, 18, .5);
  --font: "PingFang SC", "Microsoft YaHei", "HarmonyOS Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font-family: var(--font); color: var(--c-text);
  background: var(--c-bg-0); font-size: 15px; line-height: 1.75;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
::selection { background: rgba(79, 124, 255, .4); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.wrap { width: min(1120px, 92%); margin: 0 auto; }
.center { text-align: center; }

/* ── 背景光晕 ── */
.bg-orbs { position: fixed; inset: 0; z-index: -1; overflow: hidden; background:
  radial-gradient(1200px 700px at 85% -10%, #131a3a 0%, transparent 60%),
  radial-gradient(900px 600px at -10% 40%, #101632 0%, transparent 55%),
  var(--c-bg-0); }
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; animation: drift 16s ease-in-out infinite alternate; }
.o1 { width: 480px; height: 480px; top: -160px; right: -80px; background: radial-gradient(circle, #4F7CFF66, transparent 70%); }
.o2 { width: 420px; height: 420px; top: 32%; left: -140px; background: radial-gradient(circle, #8B5CF655, transparent 70%); animation-delay: -6s; }
.o3 { width: 380px; height: 380px; bottom: -120px; right: 22%; background: radial-gradient(circle, #22D3EE44, transparent 70%); animation-delay: -11s; }
@keyframes drift { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(40px, 30px, 0) scale(1.12); } }

/* ── 导航 ── */
.nav { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  background: rgba(11, 14, 26, .72); border-bottom: 1px solid var(--glass-line); }
.nav-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 19px; font-weight: 800; letter-spacing: .5px; }
.logo-mark { filter: drop-shadow(0 0 10px rgba(79,124,255,.6)); }
.nav-links { display: flex; gap: 24px; margin-left: auto; }
.nav-links a { color: var(--c-text-dim); font-size: 14.5px; transition: color .2s; position: relative; padding: 4px 0; }
.nav-links a:hover { color: var(--c-text); }
.nav-links a::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px; background: var(--grad-main); border-radius: 2px; transition: width .25s; }
.nav-links a:hover::after { width: 100%; }
.nav-cta { margin-left: 8px; }
.nav-burger { display: none; margin-left: auto; background: none; border: 1px solid var(--glass-line); color: var(--c-text); font-size: 20px; border-radius: 10px; padding: 4px 12px; cursor: pointer; }

/* ── 按钮 ── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 26px;
  border-radius: 999px; font-size: 14.5px; font-weight: 600; cursor: pointer; border: 1px solid transparent;
  transition: transform .2s, box-shadow .25s, background .25s; }
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--grad-main); color: #fff; box-shadow: 0 8px 28px rgba(79, 124, 255, .38); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(139, 92, 246, .5); }
.btn-ghost { background: rgba(245,247,255,.05); border-color: var(--glass-line); color: var(--c-text); backdrop-filter: blur(8px); }
.btn-ghost:hover { background: rgba(245,247,255,.1); transform: translateY(-2px); }

/* ── Hero ── */
.hero { padding: 96px 0 40px; text-align: center; }
.hero-badge { display: inline-flex; padding: 7px 18px; border-radius: 999px; font-size: 13px; color: #cfe0ff;
  background: var(--grad-soft); border: 1px solid rgba(79, 124, 255, .3); margin-bottom: 26px; }
.hero-title { font-size: clamp(38px, 6.4vw, 64px); line-height: 1.18; font-weight: 800; margin: 0 0 20px; letter-spacing: 1px; }
.grad { background: var(--grad-main); -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 26px rgba(139, 92, 246, .35)); }
.hero-sub { color: var(--c-text-dim); font-size: 17px; margin: 0 auto 34px; max-width: 640px; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-top: 52px; }
.stat { background: var(--glass); border: 1px solid var(--glass-line); border-radius: var(--radius);
  padding: 18px 28px; min-width: 200px; backdrop-filter: blur(10px); }
.stat b { display: block; font-size: 15.5px; margin-bottom: 4px; }
.stat span { color: var(--c-text-dim); font-size: 13px; }

/* ── 分区 ── */
.section { padding: 72px 0 8px; }
.sec-head { text-align: center; margin-bottom: 40px; }
.sec-head h2 { font-size: clamp(26px, 3.6vw, 34px); font-weight: 800; margin: 0 0 8px; letter-spacing: 1px; }
.sec-head p { color: var(--c-text-dim); margin: 0; font-size: 14.5px; }

/* ── 卡片 ── */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px; }
.card { position: relative; background: var(--glass); border: 1px solid var(--glass-line); border-radius: var(--radius);
  padding: 30px 28px; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: transform .3s, border-color .3s, box-shadow .3s; overflow: hidden; }
.card::before { content: ""; position: absolute; inset: -1px; border-radius: inherit; padding: 1px; opacity: 0;
  background: var(--grad-main); -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; transition: opacity .35s; pointer-events: none; }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(79, 124, 255, .35); }
.card:hover::before { opacity: 1; }
.card-icon { width: 58px; height: 58px; display: flex; align-items: center; justify-content: center; font-size: 28px;
  border-radius: 16px; background: var(--grad-soft); border: 1px solid rgba(79, 124, 255, .28); margin-bottom: 18px; }
.card h3 { margin: 0 0 10px; font-size: 19px; font-weight: 700; }
.card > p { color: var(--c-text-dim); font-size: 14px; margin: 0 0 16px; }
.feats { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.feats li { position: relative; padding-left: 24px; color: #c6cde6; font-size: 13.5px; }
.feats li::before { content: "✦"; position: absolute; left: 0; top: 0; background: var(--grad-main);
  -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 700; }

/* ── 文章卡 ── */
.article-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.article-card { display: flex; flex-direction: column; gap: 8px; }
.article-cat { align-self: flex-start; font-size: 11.5px; padding: 3px 12px; border-radius: 999px;
  background: rgba(79, 124, 255, .16); color: #9db8ff; border: 1px solid rgba(79, 124, 255, .3); }
.article-card h3 { font-size: 16.5px; }
.article-card p { flex: 1; }
.article-more { color: #8fb0ff; font-size: 13px; }
.article-card:hover .article-more { color: var(--c-cyan); }
.article-empty { color: var(--c-text-dim); text-align: center; padding: 30px 0; grid-column: 1/-1; }

/* ── 联系 ── */
.contact-card { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px;
  background: var(--glass); border: 1px solid var(--glass-line); border-radius: var(--radius);
  padding: 30px; backdrop-filter: blur(14px); }
.contact-item { display: flex; align-items: center; gap: 16px; }
.ci-icon { width: 50px; height: 50px; flex: none; display: flex; align-items: center; justify-content: center;
  font-size: 24px; border-radius: 14px; background: var(--grad-soft); border: 1px solid rgba(79,124,255,.28); }
.contact-item b { display: block; font-size: 14px; }
.contact-item code, .contact-item a { color: #9db8ff; font-size: 15px; }
.contact-item a:hover { color: var(--c-cyan); }

/* ── 页脚 ── */
.footer { margin-top: 90px; border-top: 1px solid var(--glass-line); background: rgba(11, 14, 26, .8); }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; padding: 30px 0; }
.f-brand { font-weight: 800; font-size: 17px; }
.f-links { display: flex; gap: 18px; margin-left: auto; flex-wrap: wrap; }
.f-links a { color: var(--c-text-dim); font-size: 13px; }
.f-links a:hover { color: var(--c-text); }
.f-beian { width: 100%; display: flex; gap: 16px; justify-content: center; color: #6b7396; font-size: 12.5px; padding-top: 8px; border-top: 1px dashed var(--glass-line); margin-top: 6px; }
.f-beian a { color: #6b7396; }
.f-beian a:hover { color: var(--c-text-dim); }

/* ── 滚动渐入 ── */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } .orb { animation: none; } }

/* ── 响应式 ── */
@media (max-width: 760px) {
  .nav-links, .nav-cta { display: none; }
  .nav-burger { display: block; }
  .nav-links.open { display: flex; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column;
    background: rgba(11, 14, 26, .97); padding: 18px 6%; gap: 16px; border-bottom: 1px solid var(--glass-line); }
  .hero { padding-top: 64px; }
  .br-md { display: none; }
  .stat { min-width: 46%; }
  .footer-inner { flex-direction: column; }
  .f-links { margin-left: 0; justify-content: center; }
}

/* ═══════════ 博客/文章页 ═══════════ */
.blog-wrap { width: min(860px, 92%); margin: 0 auto; padding: 56px 0 20px; }
.article-hero { margin-bottom: 34px; }
.article-hero .article-cat { margin-bottom: 12px; }
.article-hero h1 { font-size: clamp(26px, 4vw, 38px); line-height: 1.3; margin: 0 0 12px; font-weight: 800; }
.article-meta { color: #6b7396; font-size: 13px; display: flex; gap: 18px; flex-wrap: wrap; }
.article-body { background: var(--glass); border: 1px solid var(--glass-line); border-radius: var(--radius);
  padding: clamp(22px, 4vw, 44px); backdrop-filter: blur(12px); font-size: 15.5px; color: #d6dcef; }
.article-body h2 { font-size: 22px; margin: 34px 0 14px; padding-left: 14px; border-left: 4px solid;
  border-image: var(--grad-main) 1; }
.article-body h3 { font-size: 18px; margin: 26px 0 10px; color: #cfe0ff; }
.article-body p { margin: 0 0 16px; }
.article-body ul, .article-body ol { padding-left: 24px; margin: 0 0 16px; }
.article-body li { margin-bottom: 8px; }
.article-body blockquote { margin: 18px 0; padding: 14px 20px; border-left: 4px solid var(--c-primary);
  background: rgba(79, 124, 255, .08); border-radius: 0 12px 12px 0; color: #b9c4e8; }
.article-body code { background: rgba(245,247,255,.08); padding: 2px 7px; border-radius: 6px; font-size: 13.5px; }
.article-body pre { background: #0a0d1c; border: 1px solid var(--glass-line); border-radius: 12px; padding: 18px; overflow-x: auto; }
.article-body pre code { background: none; padding: 0; }
.article-body img { border-radius: 12px; margin: 10px 0; }
.back-blog { display: inline-flex; margin: 30px 0 10px; }

/* ── 博客列表页 ── */
.blog-list-head { text-align: center; padding: 70px 0 30px; }
.blog-list-head h1 { font-size: clamp(30px, 5vw, 44px); font-weight: 800; margin: 0 0 10px; }
.blog-list-head p { color: var(--c-text-dim); margin: 0; }
.cat-filter { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin: 26px 0 34px; }
.cat-btn { padding: 7px 20px; border-radius: 999px; font-size: 13.5px; color: var(--c-text-dim);
  border: 1px solid var(--glass-line); background: rgba(245,247,255,.04); transition: all .2s; }
.cat-btn:hover { color: var(--c-text); border-color: rgba(79,124,255,.4); }
.cat-btn.active { background: var(--grad-main); color: #fff; border-color: transparent; box-shadow: 0 6px 20px rgba(79,124,255,.35); }

/* 文章卡标签胶囊 */
.article-tags{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0 0}
.article-tags .tg{font-size:11px;padding:2px 9px;border-radius:999px;background:rgba(79,124,255,.12);color:#9db8ff;border:1px solid rgba(79,124,255,.3)}

.cat-gap{display:inline-block;width:16px}

/* ── 博客搜索框 + 标签云 ── */
.blog-search { margin: 28px auto 20px; max-width: 640px; position: relative; }
.blog-search .search-icon { position: absolute; left: 18px; top: 50%; transform: translateY(-50%); font-size: 17px; opacity: .65; pointer-events: none; }
.blog-search-input {
  width: 100%; padding: 14px 22px 14px 48px; font-size: 15px;
  border: 1px solid var(--glass-line); border-radius: 999px;
  background: rgba(11,14,26,.6); color: var(--c-text);
  outline: none; transition: all .22s;
}
.blog-search-input::placeholder { color: var(--c-text-dim); }
.blog-search-input:focus { border-color: var(--c-primary); background: rgba(11,14,26,.85); box-shadow: 0 0 0 4px rgba(79,124,255,.18), 0 10px 28px rgba(0,0,0,.25); }
.blog-tags { margin-top: 42px; padding-top: 24px; border-top: 1px solid var(--glass-line); }
.blog-tags-title { font-size: 15px; color: var(--c-text-dim); margin: 0 0 14px; font-weight: 600; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-chip {
  display: inline-block; padding: 6px 14px; font-size: 13px;
  border: 1px solid var(--glass-line); border-radius: 999px;
  color: var(--c-text); background: rgba(255,255,255,.03);
  cursor: pointer; transition: all .18s;
}
.tag-chip:hover { border-color: var(--c-primary); color: #fff; }
.tag-chip.active { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }