/* ==========================================================
   上线性能与顺滑度增强引擎 (Smoothness & Performance Optimization)
   ========================================================== */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  width: 100%;
}

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

/* 硬件加速与流畅悬停 */
a, button, .media-news-card, .btn-media-primary, .btn-media-secondary, .faq-card, .intro-panel {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  transform: translateZ(0);
}

/* 移动端平滑滚动与防抖 */
.table-wrapper, .table-container, .code-box, pre {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

/* 媒体图片防溢出与自适应 */
img, svg, video, canvas {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 消除点击高亮延迟 */
a, button, input, select, textarea {
  -webkit-tap-highlight-color: transparent;
}


:root{--bg:#f3f6fb;--card:#fff;--text:#101828;--muted:#667085;--line:#d0d5dd;--blue:#2563eb;--purple:#7c3aed;--green:#16a34a;--cyan:#0891b2;--soft:#eff6ff}
*{box-sizing:border-box;margin:0;padding:0}body{background:radial-gradient(circle at 16% 10%,rgba(37,99,235,.12),transparent 30%),radial-gradient(circle at 84% 16%,rgba(124,58,237,.10),transparent 28%),var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;line-height:1.68}a{color:var(--blue);text-decoration:none;font-weight:800}a:hover{text-decoration:underline}.container{width:min(1160px,calc(100% - 40px));margin:0 auto}.notice{background:#fff8e6;border-bottom:1px solid #efd28a;color:#76520b;padding:10px 0;font-size:13px}.site-header{background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.header-inner{min-height:68px;display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{color:var(--text);font-size:22px;font-weight:950}.brand:before{content:"AI";color:#fff;background:var(--blue);border-radius:9px;padding:2px 7px;margin-right:8px;font-size:13px}.nav,.footer-links{display:flex;flex-wrap:wrap;gap:10px}.nav a,.footer-links a{color:var(--text);background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 11px;font-size:14px}.nav a:hover,.footer-links a:hover{background:var(--soft);border-color:var(--blue);text-decoration:none}.hero{padding:64px 0 42px}.eyebrow{display:inline-flex;padding:6px 12px;border-radius:999px;background:var(--soft);color:var(--blue);font-size:13px;font-weight:950;margin-bottom:16px}.hero h1{max-width:940px;font-size:clamp(36px,5.6vw,74px);line-height:1.04;letter-spacing:-.07em;margin-bottom:20px}.hero p{max-width:820px;color:var(--muted);font-size:18px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.button{display:inline-flex;align-items:center;justify-content:center;min-width:180px;padding:12px 18px;border-radius:999px;border:1px solid var(--line);font-weight:950}.button.primary{background:linear-gradient(90deg,var(--blue),var(--purple));color:#fff;border:none}.button.secondary{background:#fff;color:var(--text)}.search-hub{margin-top:28px;background:#fff;border:1px solid var(--line);border-radius:26px;padding:22px;box-shadow:0 20px 50px rgba(16,24,40,.08)}.search-input{height:56px;border:1px solid var(--line);border-radius:999px;display:flex;align-items:center;padding:0 20px;color:var(--muted);background:#f9fafb;margin-bottom:18px}.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.cat{border:1px solid var(--line);border-radius:16px;padding:16px;background:#fff}.cat strong{display:block;margin-bottom:5px}.cat span{color:var(--muted);font-size:13px}.cat:nth-child(1){border-top:4px solid var(--blue)}.cat:nth-child(2){border-top:4px solid var(--green)}.cat:nth-child(3){border-top:4px solid var(--purple)}.cat:nth-child(4){border-top:4px solid var(--cyan)}.section{padding:48px 0}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:22px}.section h2{font-size:clamp(28px,4vw,48px);line-height:1.06;letter-spacing:-.06em}.section-note{max-width:450px;color:var(--muted)}.grid-6{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.card,.intro-box,.article{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 18px 42px rgba(16,24,40,.05)}.card{min-height:204px;padding:24px}.card .num{display:inline-flex;padding:4px 9px;border-radius:999px;background:var(--soft);color:var(--blue);font-size:12px;font-weight:950;margin-bottom:30px}.card h3{font-size:22px;margin-bottom:10px}.card p,.intro-box p,.intro-box li,td{color:var(--muted)}.card strong,td strong{color:var(--green)}.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.intro-box{padding:28px}.intro-box h3{font-size:28px;margin-bottom:12px}.intro-box ul{margin:14px 0 0 20px}.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:20px}table{width:100%;min-width:760px;border-collapse:collapse}th,td{padding:16px 18px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#f2f4f7;color:#344054;font-size:13px}tr:last-child td{border-bottom:0}.faq-list{display:grid;gap:12px}details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px}summary{cursor:pointer;list-style:none;font-weight:950}summary::-webkit-details-marker{display:none}details p{margin-top:10px;color:var(--muted)}.article{max-width:880px;margin:42px auto;padding:38px}.article h1{font-size:clamp(34px,5vw,62px);line-height:1.05;letter-spacing:-.06em;margin-bottom:20px}.article h2{font-size:28px;margin:34px 0 12px;border-top:1px solid var(--line);padding-top:20px}.article p,.article li{color:var(--muted);margin-bottom:12px}.article ul{margin-left:20px}.site-footer{margin-top:42px;padding:36px 0;background:#fff;border-top:1px solid var(--line)}.site-footer p{margin-top:14px;color:var(--muted);font-size:14px}@media(max-width:920px){.cat-grid{grid-template-columns:1fr 1fr}}@media(max-width:820px){.header-inner{align-items:flex-start;flex-direction:column;padding:16px 0}.cat-grid,.grid-6,.intro-grid{grid-template-columns:1fr}.section-head{display:block}.section-note{margin-top:10px}}