/* ============================================================
   TopoDigit 官网样式 —— 结构复刻 Appen 首页布局
   科技蓝、渐变、卡片。配色变量集中在 :root
   图片占位 .img-ph —— 后期替换真实图片
   ============================================================ */
:root {
  --blue-900: #0a1b3d; --blue-800: #0f2b5c; --blue-700: #143b80;
  --blue-600: #1d4ed8; --blue-500: #2563eb; --blue-400: #3b82f6;
  --cyan-400: #22d3ee;
  --ink: #0f172a; --slate: #475569; --slate-light: #64748b;
  --line: #e2e8f0; --bg: #ffffff; --bg-soft: #f6f9fe; --bg-alt: #f0f5ff;
  --radius: 16px; --radius-sm: 10px;
  --shadow: 0 10px 40px rgba(15,43,92,0.10); --shadow-sm: 0 4px 18px rgba(15,43,92,0.08);
  --maxw: 1200px; --header-h: 72px; --topbar-h: 40px;
  --font: "Inter","PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + var(--topbar-h)); }
body { font-family: var(--font); color: var(--ink); background: var(--bg); line-height: 1.65; -webkit-font-smoothing: antialiased; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- 通用标题 ---------- */
.section-title { font-size: clamp(1.6rem,3.4vw,2.5rem); font-weight: 800; line-height: 1.2; letter-spacing: -0.01em; color: var(--blue-900); margin-bottom: 18px; }
.section-title.center { text-align: center; }
.section-lead { color: var(--slate); font-size: 1.06rem; max-width: 720px; margin-bottom: 8px; }
.section-lead.center { text-align: center; margin-left: auto; margin-right: auto; margin-bottom: 44px; }

/* ---------- 按钮 ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px; border-radius: 8px; font-weight: 700; font-size: 0.98rem; cursor: pointer;
  border: 1.5px solid transparent; transition: transform .15s, box-shadow .2s, background .2s; }
.btn-primary { background: linear-gradient(135deg, var(--blue-500), var(--blue-700)); color: #fff; box-shadow: 0 8px 24px rgba(37,99,235,0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(37,99,235,0.45); }
.btn-arrow .arrow { font-size: 1.05rem; line-height: 1; transition: transform .15s; }
.btn-arrow:hover .arrow { transform: translateX(3px); }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; font-size: 0.95rem; color: var(--blue-600); margin-top: 8px; }
.link-arrow::after { content: "→"; transition: transform .15s; }
.link-arrow:hover::after { transform: translateX(3px); }

/* ---------- 图片占位 ---------- */
.img-ph { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  border: 2px dashed var(--blue-400); border-radius: 20px; color: var(--slate-light);
  background: repeating-linear-gradient(45deg, rgba(37,99,235,0.04) 0 14px, transparent 14px 28px), var(--bg-soft);
  font-size: 0.86rem; font-weight: 600; text-align: center; }
.img-ph .ph-icon { font-size: 2.6rem; opacity: .55; }
.img-ph-lg { min-height: 360px; }
.img-ph-md { min-height: 280px; }
.section-img { display: block; width: 100%; height: auto; border-radius: var(--radius); box-shadow: var(--shadow); }

/* ============ HEADER ============ */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: var(--blue-900); border-bottom: 1px solid rgba(255,255,255,0.08); transition: box-shadow .2s; }
.site-header.scrolled { box-shadow: var(--shadow-sm); }
.topbar { background: rgba(0,0,0,0.22); border-bottom: 1px solid rgba(255,255,255,0.08); }
.topbar-inner { height: var(--topbar-h); display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.topbar-link { display: inline-flex; align-items: center; gap: 8px; color: var(--cyan-400); font-size: 0.92rem; font-weight: 600; opacity: .92; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar-link:hover { opacity: 1; }
.topbar-arrow { font-size: 1.1rem; }
.topbar-right { display: flex; align-items: center; gap: 16px; flex-shrink: 0; }

.nav-inner { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 9px; font-size: 1.42rem; font-weight: 800; color: #fff; }
.brand-mark { color: var(--cyan-400); font-size: 1.5rem; }
.brand-name b { color: var(--cyan-400); font-weight: 800; }

.main-nav { display: flex; align-items: center; gap: 30px; }
.nav-item { position: relative; }
.nav-top { display: inline-flex; align-items: center; gap: 5px; height: var(--header-h); font-weight: 600; font-size: 1.06rem; color: #fff; opacity: .82; transition: opacity .15s, color .15s; }
.has-mega > .nav-top::after { content: "▾"; font-size: .7rem; opacity: .7; }
.nav-item:hover .nav-top { opacity: 1; color: var(--cyan-400); }
.mega { position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(8px); background: var(--blue-900); border: 1px solid rgba(255,255,255,0.1); border-radius: 14px; box-shadow: var(--shadow); padding: 20px; min-width: 230px; opacity: 0; visibility: hidden; transition: opacity .16s, transform .16s, visibility .16s; z-index: 1001; }
.nav-item:hover .mega { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.mega-col { display: grid; gap: 4px; }
.mega-wide { display: flex; gap: 32px; align-items: start; }
.mega-wide .mega-col:first-child { border-right: 1px solid rgba(255,255,255,0.12); padding-right: 32px; }
.mega-apps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px 4px; }
.mega-col-2 { grid-template-columns: 1fr 1fr; column-gap: 28px; }
.mega-col-2 .mega-h { grid-column: 1 / -1; }
.mega-h { font-size: 0.84rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,0.55); margin-bottom: 8px; }
.mega a { display: block; padding: 8px 12px; border-radius: 8px; font-size: 1.02rem; font-weight: 500; color: rgba(255,255,255,0.85); white-space: nowrap; transition: background .14s, color .14s; }
.mega a:hover { background: rgba(255,255,255,0.1); color: #fff; }

.nav-tools { display: flex; align-items: center; gap: 14px; }
.util-link { font-size: 0.82rem; font-weight: 600; color: rgba(255,255,255,0.78); transition: color .15s; }
.util-link:hover { color: #fff; }
.btn-contact { background: #fff; color: var(--blue-900); padding: 10px 22px; font-size: 1rem; border-radius: 8px; font-weight: 700; }
.btn-contact:hover { background: var(--bg-alt); transform: translateY(-1px); }
.lang-switch { position: relative; }
.lang-btn { display: flex; align-items: center; gap: 5px; background: none; border: none; padding: 6px 2px; cursor: pointer; font-weight: 600; font-size: 0.92rem; color: rgba(255,255,255,0.85); transition: color .15s; }
.lang-btn:hover { color: #fff; }
.lang-btn .caret { font-size: .78rem; opacity: .7; }
.lang-menu { position: absolute; right: 0; top: 100%; padding-top: 8px; background: none; border: none; box-shadow: none;
  min-width: 168px; opacity: 0; visibility: hidden; transform: translateY(-6px); transition: opacity .15s, transform .15s, visibility .15s; z-index: 1002; }
.lang-menu::before { content: ""; position: absolute; left: 0; right: 0; top: 8px; bottom: 0;
  background: var(--blue-900); border: 1px solid rgba(255,255,255,0.12); border-radius: 12px; box-shadow: var(--shadow); }
.lang-menu li { position: relative; z-index: 1; padding: 0 6px; }
.lang-menu li:first-child { padding-top: 6px; }
.lang-menu li:last-child { padding-bottom: 6px; }
.lang-switch:hover .lang-menu, .lang-menu.open { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu button { width: 100%; text-align: left; background: none; border: none; padding: 9px 12px; border-radius: 8px; cursor: pointer; font-size: 1rem; color: rgba(255,255,255,0.85); font-weight: 500; }
.lang-menu button:hover { background: rgba(255,255,255,0.1); color: #fff; }
.lang-menu button.active { background: rgba(255,255,255,0.16); color: #fff; }
.menu-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: #fff; }

/* ============ HERO ============ */
.hero { position: relative; min-height: 720px; padding: calc(var(--header-h) + var(--topbar-h) + 90px) 0 100px; overflow: hidden; display: flex; align-items: center; }
.hero-bg { position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(1000px 720px at 60% 42%, #ffffff 0%, rgba(255,255,255,0) 55%),
    radial-gradient(1100px 820px at 100% 72%, rgba(219,234,251,0.9), transparent 60%),
    radial-gradient(950px 950px at 6% 30%, rgba(147,197,253,0.55), transparent 60%),
    linear-gradient(120deg, #cfe0f7 0%, #dfeafb 45%, #eef4fd 100%); }
.hero-bg::after { content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(15,43,92,0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(15,43,92,0.04) 1px, transparent 1px);
  background-size: 46px 46px; mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%); }
.hero-inner { position: relative; text-align: center; max-width: 900px; width: 100%; margin: 0 auto; }
.hero-title { font-size: clamp(2.2rem,5.6vw,3.8rem); font-weight: 800; line-height: 1.14; margin-bottom: 10px; color: var(--blue-600); }
.hero-tagline { font-size: clamp(1.2rem,2.6vw,1.9rem); font-weight: 400; color: var(--slate); margin-bottom: 26px; }
.hero-sub { font-size: clamp(1rem,1.8vw,1.12rem); color: var(--slate); max-width: 720px; margin: 0 auto 34px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ============ INTRO 人机结合 ============ */
.intro { padding: 90px 0; background: var(--bg); }
.intro-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.intro-quote { color: var(--slate); font-size: 1.02rem; margin: 18px 0 28px; padding-left: 18px; border-left: 3px solid var(--blue-400); }

/* ============ 深色信任带 ============ */
.band { background: var(--blue-900); padding: 44px 0; text-align: center; }
.band-title { color: #fff; font-size: clamp(1.1rem,2.4vw,1.6rem); font-weight: 800; margin-bottom: 26px; }
.band-marquee { overflow: hidden; width: 100%; background: var(--blue-900);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.band-track { display: flex; align-items: center; gap: 88px; width: max-content; background: var(--blue-900); animation: band-scroll 55s linear infinite; }
.band-marquee:hover .band-track { animation-play-state: paused; }
.band-logo { height: 64px; width: auto; object-fit: contain; flex: none; mix-blend-mode: screen; }
@keyframes band-scroll { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .band-track { animation: none; } }

/* ============ 大模型应用落地 ============ */
.llm { padding: 96px 0; background: var(--bg-soft); }
.llm-cta { text-align: center; margin-top: -20px; margin-bottom: 60px; }
.llm .section-title { color: #1a7fd4; }
.ring-wrap { display: flex; justify-content: center; margin: 0 auto -14px; }
.ring-svg { width: 100%; max-width: 660px; height: auto; overflow: visible; }
.ring-cobox { width: 100%; height: 100%; box-sizing: border-box; display: flex; align-items: center;
  background: #eef2f6; border: 1px solid #dbe3ec; border-radius: 10px; padding: 16px 20px;
  font-size: 21px; line-height: 1.5; color: var(--slate); text-align: left; }
.ring-lbl { fill: #fff; font-size: 25px; font-weight: 500; letter-spacing: 1.5px; pointer-events: none; }
/* 拉丁/西里尔文标签更长, 降一档并收紧字距以完整显示 */
html[lang="en"] .ring-lbl { font-size: 20px; letter-spacing: 0; }
html[lang="ru"] .ring-lbl { font-size: 17px; letter-spacing: -0.2px; }
html[lang="fr"] .ring-lbl { font-size: 20px; letter-spacing: 0; }
.qhit { cursor: pointer; transition: fill .15s; }
.qhit:hover { fill: #0d8ecb; }
.ring-callout { opacity: 0; pointer-events: none; transition: opacity .18s; }
.q1:hover ~ .co1, .q2:hover ~ .co2, .q3:hover ~ .co3, .q4:hover ~ .co4 { opacity: 1; }
.ring-ctr { fill: #4a5b6d; font-size: 22px; font-weight: 400; }
.ring-side { fill: #6b7d8f; font-size: 20px; font-weight: 500; }
.llm-flow { display: flex; align-items: stretch; justify-content: center; gap: 0; width: 100%; margin: 0 auto;
  border: 1.5px solid #5cc7f0; border-radius: 8px; background: transparent; }
.llm-flow-item { flex: 1; padding: 34px 16px; text-align: center; font-size: 1.32rem; font-weight: 500; color: #3d4d5c; display: flex; align-items: center; justify-content: center; }
.llm-flow-arrow { display: flex; align-items: center; padding: 0 2px; color: #5cc7f0; font-size: 1.5rem; }

/* ============ 全流程数据支持 ============ */
.fullflow { padding: 96px 0; background: var(--bg); }
.ff-block { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; margin-bottom: 64px; }
.ff-block:last-child { margin-bottom: 0; }
.ff-block.reverse .ff-text { order: 2; }
.ff-block.reverse .ff-visual { order: 1; }
.ff-text h3 { font-size: 1.5rem; color: var(--blue-900); margin-bottom: 16px; }
.ff-text p { color: var(--slate); font-size: 1rem; margin-bottom: 12px; }
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.pill { padding: 6px 16px; border-radius: 999px; background: var(--bg-alt); color: var(--blue-600); font-size: 0.86rem; font-weight: 700; border: 1px solid var(--line); }
.ff-list { display: grid; gap: 10px; margin: 4px 0 12px; }
.ff-list li { position: relative; padding-left: 28px; color: var(--slate); font-size: 0.98rem; }
.ff-list li::before { content: "✓"; position: absolute; left: 0; top: 1px; width: 20px; height: 20px; border-radius: 50%; background: var(--blue-500); color: #fff; font-size: .72rem; font-weight: 700; display: grid; place-items: center; }

/* ============ AI 应用场景 ============ */
.scenarios { padding: 96px 0; background: var(--bg-soft); }
.sc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.sc-card { position: relative; aspect-ratio: 4 / 3; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: transform .25s, box-shadow .25s; }
.sc-card::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10,27,61,0.15) 0%, rgba(10,27,61,0.45) 55%, rgba(10,27,61,0.82) 100%); }
.sc-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.sc-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.sc-card:hover .sc-img { transform: scale(1.06); }
.sc-card h3 { position: absolute; left: 22px; bottom: 20px; z-index: 2; margin: 0;
  font-size: 1.16rem; font-weight: 700; color: #fff; text-shadow: 0 1px 6px rgba(0,0,0,.45); transition: bottom .25s; }
.sc-card p { position: absolute; left: 22px; right: 22px; bottom: 20px; z-index: 2;
  color: rgba(255,255,255,0.92); font-size: 0.9rem; line-height: 1.5;
  opacity: 0; transform: translateY(8px); transition: opacity .25s, transform .25s; }
.sc-card:hover h3 { bottom: calc(20px + 4.6em); }
.sc-card:hover p { opacity: 1; transform: translateY(0); }

/* ============ 大规模高质量数据 CTA ============ */
.cta-band { padding: 72px 0; background: linear-gradient(135deg, var(--blue-900), var(--blue-700)); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-copy h2 { font-size: clamp(1.5rem,3.2vw,2.2rem); font-weight: 800; color: #fff; margin-bottom: 8px; }
.cta-copy p { color: rgba(255,255,255,0.82); font-size: 1.05rem; }
.btn-cta { background: #fff; color: var(--blue-900); white-space: nowrap; font-weight: 700; }
.btn-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(0,0,0,0.25); }

/* ============ FOOTER ============ */
.site-footer { background: var(--blue-900); color: rgba(255,255,255,0.8); padding-top: 56px; }
.footer-top { display: grid; grid-template-columns: 1.4fr 3fr; gap: 40px; padding-bottom: 40px; }
.footer-brand .brand-mark { color: var(--cyan-400); font-size: 1.35rem; }
.footer-brand .brand-name { font-size: 1.3rem; font-weight: 800; color: #fff; }
.footer-brand p { margin: 14px 0 18px; font-size: 0.92rem; color: rgba(255,255,255,0.6); max-width: 300px; }
.footer-social { display: flex; gap: 15px; align-items: center; }
.social-ico { display: inline-flex; align-items: center; justify-content: center; height: 21px; color: #fff; transition: opacity .15s, transform .15s; opacity: .95; }
.social-ico:hover { opacity: 1; transform: translateY(-2px); }
.social-ico svg { height: 100%; width: auto; fill: currentColor; }
.social-ico.ico-chat { height: 23px; }
.social-ico .bubble2 { stroke: var(--blue-900); }
.footer-cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.footer-col h4 { color: #fff; font-size: 0.98rem; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 0.9rem; color: rgba(255,255,255,0.65); margin-bottom: 10px; }
.footer-col a:hover { color: var(--cyan-400); }
.footer-addr { font-size: 0.88rem; color: rgba(255,255,255,0.6); margin-bottom: 8px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding: 20px 0; }
.footer-bottom .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 0.85rem; color: rgba(255,255,255,0.5); }

/* ============ 留言浮窗 ============ */
.msg-widget { position: fixed; right: 24px; bottom: 24px; z-index: 900; display: flex; align-items: center; gap: 10px; padding: 13px 22px; border: none; border-radius: 12px; cursor: pointer; font-family: inherit; font-weight: 700; font-size: 0.92rem; color: #fff; background: linear-gradient(135deg, var(--blue-500), var(--blue-700)); box-shadow: 0 10px 30px rgba(37,99,235,0.4); transition: transform .15s, box-shadow .2s; }
.msg-widget:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(37,99,235,0.5); }
.msg-widget .msg-caret { font-size: 0.85rem; }

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .intro-inner, .ff-block, .ff-block.reverse .ff-text, .ff-block.reverse .ff-visual { grid-template-columns: 1fr; gap: 36px; order: 0; }
  .llm-flow { flex-direction: column; }
  .llm-flow-item { border-bottom: 1px solid var(--line); }
  .llm-flow-item:last-child { border-bottom: none; }
  .llm-flow-arrow { transform: rotate(90deg); padding: 6px 0; }
  .sc-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); }
  .cta-inner { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 720px) {
  .main-nav { position: fixed; top: calc(var(--header-h) + var(--topbar-h)); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 8px 0; box-shadow: var(--shadow); transform: translateY(-120%); transition: transform .25s; z-index: 999; }
  .main-nav.open { transform: translateY(0); }
  .nav-item { position: static; }
  .nav-top { height: auto; padding: 14px 24px; color: var(--ink); opacity: 1; }
  .nav-item:hover .nav-top { color: var(--blue-500); }
  .has-mega > .nav-top::after { display: none; }
  .mega { position: static; transform: none; opacity: 1; visibility: visible; box-shadow: none; border: none; border-radius: 0; padding: 0 24px 12px; min-width: 0; background: transparent; }
  .mega-col-2 { grid-template-columns: 1fr; }
  .mega-wide { display: block; }
  .mega-wide .mega-col:first-child { border-right: none; padding-right: 0; }
  .mega-apps-grid { grid-template-columns: 1fr; }
  .mega-h { display: none; }
  .mega a { padding: 8px 12px 8px 24px; font-size: 0.9rem; color: var(--slate); }
  .menu-toggle { display: block; }
  .topbar-link { font-size: 0.72rem; max-width: 60%; }
  .topbar-right .util-link { display: none; }
  .btn-contact { display: none; }
  .ring-svg { max-width: 340px; }
  .sc-grid { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr; }
  .msg-widget { right: 16px; bottom: 16px; padding: 11px 18px; }
}

/* ============ 联系页 ============ */
.contact-hero { position: relative; padding: calc(var(--header-h) + var(--topbar-h) + 70px) 0 60px; overflow: hidden; text-align: center; }
.contact-hero-title { font-size: clamp(2rem,4.6vw,3.2rem); font-weight: 800; color: var(--blue-600); margin-bottom: 14px; }
.contact-hero-sub { font-size: clamp(1rem,1.8vw,1.14rem); color: var(--slate); max-width: 760px; margin: 0 auto; }
.contact-body { padding: 64px 0 96px; background: var(--bg); }
.contact-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 56px; align-items: start; }

/* 表单 */
.contact-form-title { font-size: 1.5rem; color: var(--blue-900); margin-bottom: 24px; }
.contact-form { display: grid; gap: 18px; }
.cf-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.cf-field { display: grid; gap: 7px; }
.cf-field > span { font-size: 0.9rem; font-weight: 700; color: var(--blue-900); }
.cf-field input, .cf-field select, .cf-field textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 10px;
  font-family: inherit; font-size: 0.96rem; color: var(--ink); background: var(--bg-soft); transition: border-color .15s, background .15s; }
.cf-field textarea { resize: vertical; min-height: 110px; }
.cf-field input:focus, .cf-field select:focus, .cf-field textarea:focus { outline: none; border-color: var(--blue-500); background: #fff; }
.cf-field input::placeholder, .cf-field textarea::placeholder { color: var(--slate-light); }
.cf-consent { display: flex; align-items: flex-start; gap: 10px; font-size: 0.88rem; color: var(--slate); }
.cf-consent input { margin-top: 3px; width: 16px; height: 16px; accent-color: var(--blue-500); flex-shrink: 0; }
.contact-form .btn-primary { justify-self: start; padding: 13px 34px; }
.cf-note { font-size: 0.82rem; color: var(--slate-light); }
.cf-success { font-size: 0.95rem; font-weight: 700; color: #15803d; background: #ecfdf3; border: 1px solid #a7f3d0; border-radius: 10px; padding: 12px 16px; }
.cf-error { font-size: 0.95rem; font-weight: 700; color: #b91c1c; background: #fef2f2; border: 1px solid #fecaca; border-radius: 10px; padding: 12px 16px; }
.contact-form .btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; box-shadow: none; }

/* 右侧信息 + 资源 */
.contact-side { display: grid; gap: 30px; }
.contact-info { background: linear-gradient(135deg, var(--blue-900), var(--blue-700)); color: #fff; border-radius: var(--radius); padding: 28px 26px; }
.contact-info h3 { font-size: 1.16rem; margin-bottom: 18px; }
.contact-info-list { display: grid; gap: 14px; }
.contact-info-list li { display: flex; align-items: center; gap: 12px; font-size: 0.96rem; color: rgba(255,255,255,0.9); }
.contact-info-list a:hover { color: var(--cyan-400); }
.ci-ic { font-size: 1.1rem; }
.contact-res-title { font-size: 1.16rem; color: var(--blue-900); }
.res-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: -12px; }
.res-card { display: block; padding: 22px 20px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s, border-color .2s; }
.res-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--blue-400); }
.res-ic { font-size: 1.8rem; display: block; margin-bottom: 12px; }
.res-card h4 { font-size: 1.02rem; color: var(--blue-900); margin-bottom: 8px; }
.res-card p { font-size: 0.88rem; color: var(--slate); margin-bottom: 12px; }

@media (max-width: 960px) {
  .contact-grid { grid-template-columns: 1fr; gap: 44px; }
}
@media (max-width: 720px) {
  .cf-row { grid-template-columns: 1fr; }
  .res-cards { grid-template-columns: 1fr; }
}

/* ============ 大模型数据服务（九大垂类） ============ */
.vd-hero { position: relative; min-height: 720px; padding: calc(var(--header-h) + var(--topbar-h) + 40px) 0 40px; overflow: hidden; text-align: center;
  display: flex; flex-direction: column; align-items: center; justify-content: center; }
.vd-hero-title { font-size: clamp(2rem,4.6vw,3.2rem); font-weight: 800; color: var(--blue-600); margin-bottom: 14px; }
.vd-hero-sub { font-size: clamp(1rem,1.8vw,1.14rem); color: var(--slate); max-width: 780px; margin: 0 auto; }
.vd-blocks { padding: 96px 0 112px; background: var(--bg); }
.vd-sec-head { text-align: center; max-width: 780px; margin: 0 auto 72px; }
.vd-sec-title { font-size: clamp(1.8rem,3.4vw,2.6rem); font-weight: 800; color: var(--blue-600); margin-bottom: 14px; }
.vd-sec-sub { font-size: clamp(1rem,1.6vw,1.1rem); color: var(--slate); }
.vd-block { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; margin-bottom: 96px; }
.vd-block:last-child { margin-bottom: 0; }
.vd-block.reverse .vd-text { order: 2; }
.vd-block.reverse .vd-visual { order: 1; }
.vd-tag { display: inline-block; font-size: 0.86rem; font-weight: 700; color: var(--blue-600);
  background: var(--bg-alt); border: 1px solid var(--line); border-radius: 999px; padding: 4px 14px; margin-bottom: 12px; }
.vd-text h3 { font-size: 1.6rem; color: var(--blue-900); margin-bottom: 18px; }
.vd-list { display: grid; gap: 12px; }
.vd-list li { position: relative; padding-left: 28px; color: var(--slate); font-size: 1rem; }
.vd-list li::before { content: "✓"; position: absolute; left: 0; top: 2px; width: 20px; height: 20px; border-radius: 50%; background: var(--blue-500); color: #fff; font-size: .72rem; font-weight: 700; display: grid; place-items: center; }

@media (max-width: 960px) {
  .vd-block, .vd-block.reverse .vd-text, .vd-block.reverse .vd-visual { grid-template-columns: 1fr; gap: 32px; order: 0; }
}

/* ============ 智能大模型开发平台 ============ */
.pf-hero { position: relative; min-height: 720px; padding: calc(var(--header-h) + var(--topbar-h) + 40px) 0 40px;
  display: flex; align-items: center;
  background: linear-gradient(135deg, #eef4ff 0%, #f6f9fe 55%, #eafbff 100%); overflow: hidden; }
.pf-hero-inner { max-width: 860px; margin: 0 auto; text-align: center; display: flex; flex-direction: column; align-items: center; }
.pf-hero-title { font-size: clamp(2rem,4.4vw,3rem); font-weight: 800; line-height: 1.18; color: var(--blue-900); margin-bottom: 20px; }
.pf-hero-sub { font-size: clamp(1rem,1.8vw,1.12rem); color: var(--slate); margin-bottom: 32px; }
.pf-intro { padding: 66px 0; background: linear-gradient(135deg, var(--blue-900), var(--blue-800)); color: #fff; text-align: center; }
.pf-intro-inner h2 { font-size: clamp(1.6rem,3.2vw,2.3rem); font-weight: 800; margin-bottom: 16px; }
.pf-intro-inner p { color: rgba(255,255,255,0.82); font-size: 1.05rem; max-width: 860px; margin: 0 auto; }

.pf-feat { padding: 84px 0; background: var(--bg); }
.pf-sec-title { text-align: center; font-size: clamp(1.6rem,3.4vw,2.4rem); font-weight: 800; color: var(--blue-900); margin-bottom: 40px; }
.pf-tabs { display: flex; flex-wrap: wrap; justify-content: flex-start; gap: 10px; margin-bottom: 44px; border-bottom: 1px solid var(--line); }
.pf-tab { padding: 14px 26px; background: none; border: none; border-bottom: 3px solid transparent; margin-bottom: -1px;
  font-size: 1.22rem; font-weight: 700; color: var(--slate); cursor: pointer; transition: color .2s, border-color .2s; }
.pf-tab:hover { color: var(--blue-600); }
.pf-tab.active { color: var(--blue-600); border-bottom-color: var(--blue-600); }
.pf-panel { display: none; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  padding: 40px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-sm); }
.pf-panel.active { display: grid; }
.pf-panel-list { display: grid; gap: 22px; }
.pf-fitem h4 { font-size: 1.16rem; color: var(--blue-900); margin-bottom: 8px; }
.pf-fitem p { color: var(--slate); font-size: 0.96rem; line-height: 1.7; }
.pf-panel-visual { display: flex; justify-content: center; }

.pf-apps { padding: 84px 0; background: var(--bg-soft); }
.pf-app-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.pf-app-card { position: relative; height: 220px; border-radius: var(--radius-sm); overflow: hidden; cursor: pointer;
  box-shadow: var(--shadow-sm); transition: transform .25s, box-shadow .25s; }
.pf-app-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.pf-app-bg { position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--blue-700), var(--blue-500)); transition: transform .4s; }
.pf-app-card:hover .pf-app-bg { transform: scale(1.06); }
.pf-app-emoji { font-size: 3rem; opacity: .9; filter: drop-shadow(0 4px 10px rgba(0,0,0,.25)); }
.pf-app-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.pf-app-card:hover .pf-app-img { transform: scale(1.06); }
.pf-app-bg::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10,27,61,.15) 0%, rgba(10,27,61,.45) 55%, rgba(10,27,61,.82) 100%); }
.pf-app-cap { position: absolute; inset: 0; z-index: 2; }
.pf-app-title { position: absolute; left: 18px; bottom: 18px; font-size: 1.12rem; font-weight: 700; color: #fff;
  text-shadow: 0 1px 6px rgba(0,0,0,.45); transition: bottom .25s; }
.pf-app-card:hover .pf-app-title { bottom: calc(18px + 4.6em); }
.pf-app-desc { position: absolute; left: 18px; right: 18px; bottom: 18px; margin: 0;
  font-size: 0.84rem; line-height: 1.5; color: rgba(255,255,255,0.92);
  opacity: 0; transform: translateY(8px); transition: opacity .25s, transform .25s; }
.pf-app-card:hover .pf-app-desc { opacity: 1; transform: translateY(0); }
/* 图示上的图标标签（按图中六边形位置定位, 百分比随图缩放） */
.pf-diagram { position: relative; display: inline-block; line-height: 0; }
.pf-dlbl { position: absolute; left: 14.4%; transform: translateX(-50%); text-align: center;
  font-size: clamp(0.72rem, 1.05vw, 0.88rem); font-weight: 400; line-height: 1.2;
  color: var(--blue-900); white-space: nowrap; pointer-events: none; }
.pf-dlbl-1 { top: 33%; }
.pf-dlbl-2 { top: 57.5%; }
.pf-dlbl-3 { top: 82%; }
/* 面板四只有两个图标, 垂直位置不同 */
.pf-dlbl-a { top: 38%; }
.pf-dlbl-b { top: 79%; }
.pf-adv { padding: 84px 0 96px; background: var(--bg); }
.pf-adv-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 56px 72px; max-width: 900px; margin: 0 auto; }
.pf-adv-item { text-align: center; }
.pf-adv-ic { display: inline-grid; place-items: center; width: 72px; height: 72px; color: var(--blue-600); margin-bottom: 18px; }
.pf-adv-ic svg { width: 100%; height: 100%; }
.pf-adv-item h4 { font-size: 1.22rem; color: var(--blue-900); margin-bottom: 12px; }
.pf-adv-item p { color: var(--slate); font-size: 0.98rem; line-height: 1.7; }

@media (max-width: 960px) {
  .pf-panel, .pf-panel.active { grid-template-columns: 1fr; gap: 32px; }
  .pf-app-grid { grid-template-columns: repeat(3, 1fr); }
  .pf-adv-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .pf-app-grid { grid-template-columns: repeat(2, 1fr); }
  .pf-adv-grid { grid-template-columns: 1fr; }
}