/* ============================================================
   商翼云官网 · 高端 AI 科技设计系统
   珠海市商翼云人工智能科技有限责任公司
   ============================================================ */
:root {
  --deep: #070b16;        /* 极深夜空蓝黑 */
  --deep-2: #0c1326;      /* 次级深蓝 */
  --deep-3: #131c36;      /* 深蓝面板 */
  --bg: #ffffff;
  --surface: #f4f6fb;
  --ink: #0b1226;
  --muted: #5b6b84;
  --brand: #4f46e5;
  --brand-2: #3b82f6;
  --cyan: #22d3ee;
  --gold: #c8a24a;
  --gold-soft: rgba(200, 162, 74, .16);
  --line: #e5e9f2;
  --line-dark: rgba(255, 255, 255, .09);
  --radius: 18px;
  --shadow-sm: 0 1px 2px rgba(11, 18, 38, .05);
  --shadow-md: 0 18px 40px rgba(11, 18, 38, .08);
  --shadow-lg: 0 30px 70px rgba(11, 18, 38, .16);
  --maxw: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--muted); }
.center { text-align: center; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 13px 28px; border-radius: 10px; font-weight: 600; font-size: 15px;
  cursor: pointer; border: 1px solid transparent; transition: all .25s ease; white-space: nowrap;
  letter-spacing: .2px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--brand-2), var(--brand));
  color: #fff; box-shadow: 0 10px 26px rgba(79, 70, 229, .34);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(79, 70, 229, .44); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn-light { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.28); backdrop-filter: blur(6px); }
.btn-light:hover { background: rgba(255,255,255,.2); transform: translateY(-2px); }
.btn-gold { background: linear-gradient(135deg, #d8b45c, var(--gold)); color: #0b1226; box-shadow: 0 10px 26px rgba(200, 162, 74, .34); }
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(200, 162, 74, .44); }
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-block { width: 100%; }

/* ---------- 页头 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.site-header.scrolled {
  background: rgba(8, 12, 24, .86);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom-color: var(--line-dark);
  box-shadow: 0 12px 40px rgba(0, 0, 0, .3);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 78px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; transition: opacity .2s; min-height: 44px; }
.brand:hover { opacity: .88; }
.brand-mark { width: 44px; height: 44px; display: block; flex: none; filter: drop-shadow(0 6px 16px rgba(59, 130, 246, .4)); }
.brand-text { display: flex; flex-direction: column; line-height: 1.06; }
.brand-name { font-size: 25px; font-weight: 800; letter-spacing: 1px; color: #fff; }
.brand-sub { font-size: 9px; letter-spacing: 3.2px; color: rgba(255,255,255,.55); font-weight: 600; margin-top: 4px; }
.nav { display: flex; gap: 4px; }
.nav-link {
  padding: 9px 16px; border-radius: 10px; color: rgba(255,255,255,.78); font-weight: 500;
  font-size: 15px; transition: all .18s; letter-spacing: .4px;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,.08); }
.nav-link.active { color: #fff; background: rgba(255,255,255,.1); box-shadow: inset 0 0 0 1px rgba(255,255,255,.18); }
.menu-toggle { display: none; background: none; border: none; cursor: pointer; color: #fff; width: 44px; height: 44px; border-radius: 10px; align-items: center; justify-content: center; }
.menu-toggle:hover { background: rgba(255,255,255,.08); }

/* ---------- 主视觉 Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  min-height: 100vh; display: flex; align-items: center;
  color: #fff; padding: 140px 0 120px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: url('../img/hero.jpg') center 40% / cover no-repeat;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background:
    linear-gradient(90deg, rgba(7, 11, 22, .94) 0%, rgba(7, 11, 22, .78) 42%, rgba(7, 11, 22, .35) 72%, rgba(7, 11, 22, .62) 100%),
    linear-gradient(180deg, rgba(7, 11, 22, .55) 0%, rgba(7, 11, 22, .05) 30%, rgba(7, 11, 22, .35) 88%, var(--deep) 100%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 10%, rgba(0,0,0,.8), transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 10%, rgba(0,0,0,.8), transparent 75%);
}
.hero .container { position: relative; z-index: 2; }
.hero-kicker {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 16px; border-radius: 999px;
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.16);
  font-size: 14px; letter-spacing: 2px; color: rgba(255,255,255,.85); margin-bottom: 28px;
  backdrop-filter: blur(4px);
}
.hero-kicker .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }
.hero h1 {
  font-size: clamp(38px, 5.4vw, 64px); line-height: 1.12; margin: 0 0 24px;
  font-weight: 800; letter-spacing: -.5px; max-width: 780px;
}
.hero h1 .hl { color: transparent; background: linear-gradient(120deg, #7dd3fc, #38bdf8 40%, #a5b4fc); -webkit-background-clip: text; background-clip: text; }
.hero p.lead { font-size: clamp(16px, 1.9vw, 19px); max-width: 620px; color: rgba(255,255,255,.8); margin: 0 0 38px; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 64px; }
.hero-stats {
  display: flex; gap: 0; flex-wrap: wrap;
  border-top: 1px solid rgba(255,255,255,.14); padding-top: 30px; max-width: 720px;
}
.hero-stat { flex: 1 1 140px; padding-right: 30px; }
.hero-stat .num { font-size: 32px; font-weight: 800; letter-spacing: -.5px; }
.hero-stat .num em { font-style: normal; color: var(--gold); }
.hero-stat .label { font-size: 14px; color: rgba(255,255,255,.6); margin-top: 4px; letter-spacing: 1px; }

/* ---------- 区块通用 ---------- */
section.block { padding: 100px 0; }
.section-head { max-width: 760px; margin: 0 auto 56px; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--brand); font-weight: 700; letter-spacing: 3px; font-size: 14px;
}
.eyebrow::before, .eyebrow::after { content: ""; width: 26px; height: 1px; background: linear-gradient(90deg, transparent, currentColor); }
.eyebrow::after { background: linear-gradient(90deg, currentColor, transparent); }
.eyebrow.on-dark { color: var(--cyan); }
.section-head h2 { font-size: clamp(28px, 3.6vw, 42px); margin: 14px 0 16px; font-weight: 800; letter-spacing: -.5px; line-height: 1.25; }
.section-head p { color: var(--muted); font-size: 17px; margin: 0; }
.section-head.on-dark h2 { color: #fff; }
.section-head.on-dark p { color: rgba(255,255,255,.62); }

/* ---------- 卡片栅格 ---------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; transition: all .28s ease; box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(79, 70, 229, .32); }
.card .icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 20px;
  background: linear-gradient(135deg, #eef2ff, #e0f2fe); color: var(--brand); font-size: 24px;
  box-shadow: inset 0 0 0 1px rgba(79,70,229,.12);
}
.card h3 { margin: 0 0 10px; font-size: 20px; letter-spacing: .2px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.card .card-more { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-size: 14px; font-weight: 600; color: var(--brand); opacity: 0; transform: translateY(4px); transition: all .25s; }
.card:hover .card-more { opacity: 1; transform: none; }

/* 编号能力卡 */
.cap-card { padding: 36px 32px; }
.cap-card .idx {
  font-size: 14px; font-weight: 700; letter-spacing: 3px; color: var(--gold);
  border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 22px; display: block;
}
.cap-card ul { list-style: none; padding: 0; margin: 16px 0 0; }
.cap-card ul li { font-size: 14px; color: var(--muted); padding: 7px 0 7px 22px; position: relative; }
.cap-card ul li::before { content: ""; position: absolute; left: 2px; top: 14px; width: 9px; height: 9px; border-radius: 50%; background: linear-gradient(135deg, var(--brand-2), var(--cyan)); }

/* ---------- 深色区块 ---------- */
.dark-section { background: var(--deep); color: #fff; position: relative; overflow: hidden; }
.dark-section::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, rgba(0,0,0,.7), transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, rgba(0,0,0,.7), transparent 70%);
}
.dark-section .container { position: relative; z-index: 1; }
.dark-card {
  background: rgba(255,255,255,.045); border: 1px solid var(--line-dark);
  border-radius: var(--radius); padding: 34px 30px; transition: all .28s ease; backdrop-filter: blur(6px);
}
.dark-card:hover { background: rgba(255,255,255,.08); transform: translateY(-5px); border-color: rgba(34, 211, 238, .35); }
.dark-card .icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 20px;
  background: rgba(34, 211, 238, .12); color: var(--cyan); font-size: 24px; border: 1px solid rgba(34,211,238,.2);
}
.dark-card h3 { margin: 0 0 10px; font-size: 19px; color: #fff; }
.dark-card p { margin: 0; color: rgba(255,255,255,.62); font-size: 14.5px; line-height: 1.75; }

/* ---------- 解决方案（图文） ---------- */
.solution-wrap { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.solution-media { position: relative; border-radius: 22px; overflow: hidden; box-shadow: var(--shadow-lg); }
.solution-media img { width: 100%; height: 460px; object-fit: cover; }
.solution-media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(7,11,22,.25), rgba(7,11,22,.05) 40%, rgba(7,11,22,.45));
}
.solution-media .tag-chip {
  position: absolute; left: 22px; bottom: 20px; z-index: 2;
  padding: 8px 16px; border-radius: 999px; font-size: 13px; letter-spacing: 2px;
  background: rgba(7,11,22,.6); border: 1px solid rgba(255,255,255,.22); color: #fff; backdrop-filter: blur(6px);
}
.solution-list { display: grid; gap: 16px; }
.sol-item {
  display: flex; gap: 18px; align-items: flex-start;
  padding: 22px 24px; border-radius: 16px; border: 1px solid var(--line-dark);
  background: rgba(255,255,255,.04); transition: all .25s ease; cursor: default;
}
.sol-item:hover { background: rgba(255,255,255,.085); border-color: rgba(34,211,238,.4); transform: translateX(6px); }
.sol-item .no { font-size: 13px; font-weight: 700; color: var(--gold); letter-spacing: 2px; padding-top: 3px; flex: none; }
.sol-item h4 { margin: 0 0 6px; font-size: 17px; color: #fff; }
.sol-item p { margin: 0; font-size: 14px; color: rgba(255,255,255,.6); line-height: 1.7; }

/* ---------- 信任条 ---------- */
.trust-strip {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 16px 52px;
  padding: 32px 0; border-bottom: 1px solid var(--line);
}
.trust-strip span { display: inline-flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 600; color: var(--ink); letter-spacing: 2px; }
.ts-dot { width: 8px; height: 8px; border-radius: 50%; background: linear-gradient(135deg, var(--brand-2), var(--cyan)); box-shadow: 0 0 10px rgba(34,211,238,.55); flex: none; }

/* ---------- 数据实力 ---------- */
.stats { background: var(--surface); }
.stat { text-align: center; padding: 10px 8px; }
.stat .num { font-size: clamp(40px, 5vw, 54px); font-weight: 800; letter-spacing: -1px; background: linear-gradient(135deg, var(--brand-2), var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .num .unit { font-size: .5em; }
.stat .label { color: var(--muted); font-size: 14.5px; margin-top: 6px; letter-spacing: 1px; }

/* ---------- 服务流程（时间轴） ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; counter-reset: flow; }
.flow-step { position: relative; padding: 34px 26px 30px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); transition: all .25s ease; }
.flow-step:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(79,70,229,.3); }
.flow-step .step-no {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  font-size: 16px; font-weight: 800; color: #fff; margin-bottom: 18px;
  background: linear-gradient(135deg, var(--brand-2), var(--brand));
  box-shadow: 0 8px 20px rgba(79,70,229,.3);
}
.flow-step:nth-child(2) .step-no { background: linear-gradient(135deg, #38bdf8, #22d3ee); box-shadow: 0 8px 20px rgba(34,211,238,.3); }
.flow-step:nth-child(3) .step-no { background: linear-gradient(135deg, #d8b45c, var(--gold)); box-shadow: 0 8px 20px rgba(200,162,74,.3); color: #0b1226; }
.flow-step:nth-child(4) .step-no { background: linear-gradient(135deg, #a78bfa, #7c3aed); box-shadow: 0 8px 20px rgba(124,58,237,.3); }
.flow-step h3 { margin: 0 0 8px; font-size: 18px; }
.flow-step p { margin: 0; font-size: 14px; color: var(--muted); line-height: 1.75; }
.flow-step::after {
  content: ""; position: absolute; right: -28px; top: 47px; width: 28px; height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}
.flow-step:last-child::after { display: none; }

/* ---------- CTA ---------- */
.cta-band {
  position: relative; overflow: hidden; border-radius: 26px; color: #fff;
  padding: 84px 56px; text-align: center;
  box-shadow: var(--shadow-lg);
}
.cta-band .cta-bg { position: absolute; inset: 0; background: url('../img/wing.jpg') center / cover no-repeat; }
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(7,11,22,.88), rgba(16, 24, 51, .72) 55%, rgba(79,70,229,.35));
}
.cta-band .container { position: relative; z-index: 2; }
.cta-band h2 { font-size: clamp(26px, 3.4vw, 40px); margin: 0 0 16px; font-weight: 800; letter-spacing: -.3px; }
.cta-band p { color: rgba(255,255,255,.75); font-size: 16.5px; max-width: 560px; margin: 0 auto 34px; }
.cta-band .btn-gold { box-shadow: 0 14px 34px rgba(0,0,0,.35); }

/* ---------- 内页页头 ---------- */
.page-hero {
  position: relative; overflow: hidden;
  background: linear-gradient(150deg, var(--deep) 0%, #101a3a 60%, #182348 100%);
  color: #fff; padding: 168px 0 72px;
}
.page-hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 90% at 30% 0%, rgba(0,0,0,.6), transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 90% at 30% 0%, rgba(0,0,0,.6), transparent 70%);
}
.page-hero .container { position: relative; z-index: 1; }
.breadcrumb { color: rgba(255,255,255,.5); font-size: 13.5px; letter-spacing: 1.5px; margin-bottom: 20px; }
.breadcrumb a { color: rgba(255,255,255,.7); }
.breadcrumb a:hover { color: var(--cyan); }
.page-hero h1 { font-size: clamp(32px, 4.4vw, 50px); margin: 0 0 14px; font-weight: 800; letter-spacing: -.5px; }
.page-hero p { color: rgba(255,255,255,.68); font-size: 17.5px; max-width: 720px; margin: 0; }

/* ---------- 关于 ---------- */
.about-split { display: grid; grid-template-columns: 1.08fr 1fr; gap: 56px; align-items: center; }
.about-split .lead-text { font-size: 16.5px; color: #34415c; line-height: 1.9; margin: 0 0 18px; }
.about-media { border-radius: 22px; overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }
.about-media img { width: 100%; height: 420px; object-fit: cover; }
.about-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(160deg, rgba(7,11,22,.2), transparent 45%, rgba(7,11,22,.35)); }
.tag-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.tag { background: #eef2ff; color: var(--brand-2); padding: 7px 15px; border-radius: 999px; font-size: 14px; font-weight: 600; }
.mission-card { background: linear-gradient(145deg, var(--deep-2), #1b2450); color: #fff; border-radius: var(--radius); padding: 36px; }
.mission-card h3 { color: #fff; margin: 0 0 10px; font-size: 19px; }
.mission-card .icon { color: var(--gold); }
.mission-card ul { list-style: none; padding: 0; margin: 0; }
.mission-card ul li { padding: 8px 0 8px 24px; position: relative; color: rgba(255,255,255,.82); font-size: 15px; }
.mission-card ul li::before { content: ""; position: absolute; left: 2px; top: 16px; width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); }

/* 理念时间轴（grid 三列） */
.timeline { display: grid; gap: 0; max-width: 720px; margin: 0 auto; }
.tl-row { display: grid; grid-template-columns: 96px 46px 1fr; gap: 8px; align-items: center; }
.tl-time { font-size: 14px; font-weight: 700; letter-spacing: 2px; color: var(--gold); text-align: right; padding: 22px 0; }
.tl-axis { position: relative; height: 100%; display: grid; justify-items: center; }
.tl-axis .dot {
  width: 15px; height: 15px; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-2), var(--brand));
  box-shadow: 0 0 0 5px #eef2ff, 0 6px 14px rgba(79,70,229,.35);
  z-index: 1; justify-self: center;
}
.tl-axis::before {
  content: ""; position: absolute; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(180deg, transparent, var(--line) 8%, var(--line) 92%, transparent);
}
.tl-body { padding: 22px 0 22px 14px; }
.tl-body h3 { margin: 0 0 6px; font-size: 18px; }
.tl-body p { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.75; }

/* ---------- 产品 ---------- */
.prod-card { padding: 36px 32px; }
.prod-card .idx { font-size: 14px; font-weight: 700; letter-spacing: 3px; color: var(--gold); display: block; margin-bottom: 18px; }
.prod-card h3 { font-size: 21px; }
.prod-card .prod-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.prod-card .prod-tags span { font-size: 13.5px; color: var(--brand-2); background: #eef2ff; border-radius: 999px; padding: 5px 12px; font-weight: 600; }

/* ---------- 联系 ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.1fr; gap: 44px; align-items: start; }
.info-card { background: linear-gradient(150deg, var(--deep) 0%, #131d44 100%); color: #fff; border-radius: var(--radius); padding: 36px; position: relative; overflow: hidden; }
.info-card::after { content: ""; position: absolute; right: -60px; top: -60px; width: 200px; height: 200px; border-radius: 50%; background: radial-gradient(circle, rgba(34,211,238,.14), transparent 70%); }
.info-card h3 { margin: 0 0 20px; font-size: 21px; }
.info-list { list-style: none; padding: 0; margin: 0; }
.info-list li { display: flex; gap: 16px; align-items: flex-start; padding: 16px 0; border-top: 1px solid rgba(255,255,255,.1); position: relative; z-index: 1; }
.info-list li:first-child { border-top: none; }
.info-list .iic { width: 42px; height: 42px; flex: none; border-radius: 11px; display: grid; place-items: center; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14); color: var(--cyan); }
.info-list strong { display: block; font-size: 13px; color: rgba(255,255,255,.55); font-weight: 600; letter-spacing: 1px; margin-bottom: 3px; }
.info-list .ival { font-size: 15.5px; color: #fff; line-height: 1.6; }
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 38px; box-shadow: var(--shadow-sm); }

/* ---------- 表单 ---------- */
.form { display: grid; gap: 18px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; color: var(--ink); }
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 15px; border: 1px solid var(--line); border-radius: 11px; font-size: 15px;
  font-family: inherit; background: #fbfcfe; color: var(--ink); transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--brand); background: #fff; box-shadow: 0 0 0 3px rgba(79,70,229,.12); }
.field textarea { resize: vertical; min-height: 130px; }
.form-note { font-size: 14px; color: var(--muted); }
.alert { padding: 13px 17px; border-radius: 11px; font-size: 14px; margin-bottom: 4px; }
.alert-ok { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.alert-err { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--deep); color: #94a3b8; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1.3fr; gap: 48px; padding: 76px 24px 46px; }
.footer-brand .brand-text { color: #fff; }
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-sub { color: #64748b; }
.footer-desc { color: #7c8aa5; font-size: 14.5px; margin-top: 16px; line-height: 1.9; max-width: 320px; }
.site-footer h4 { color: #fff; font-size: 14px; margin: 4px 0 18px; letter-spacing: 2px; font-weight: 700; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { padding: 6px 0; font-size: 14.5px; }
.site-footer ul li a { color: #7c8aa5; transition: color .18s; }
.site-footer ul li a:hover { color: var(--cyan); }
.footer-contact li { display: flex; gap: 12px; align-items: flex-start; padding: 8px 0; color: #7c8aa5; font-size: 14.5px; line-height: 1.7; }
.footer-contact .fci { flex: none; color: var(--cyan); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.07); padding: 26px 24px 34px; }
.footer-legal {
  display: flex; flex-wrap: wrap; gap: 10px 30px; align-items: center; justify-content: center;
  font-size: 14px; color: #64748b;
}
.footer-legal .copyright { color: #64748b; }
.legal-link { display: inline-flex; align-items: center; gap: 7px; color: #7c8aa5; transition: color .18s; padding: 9px 4px; min-height: 44px; }
.legal-link:hover { color: #fff; }
.legal-link svg { flex: none; }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-stat .num, .stat .num { transition: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .solution-wrap { grid-template-columns: 1fr; gap: 40px; }
  .about-split { grid-template-columns: 1fr; gap: 40px; }
  .contact-wrap { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .flow-step::after { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}
@media (max-width: 720px) {
  .nav {
    display: none; position: absolute; top: 62px; left: 0; right: 0; flex-direction: column;
    background: rgba(8, 12, 24, .97); border-bottom: 1px solid var(--line-dark);
    padding: 12px; box-shadow: 0 20px 50px rgba(0,0,0,.4);
  }
  .nav.open { display: flex; }
  .nav-link { padding: 13px 16px; }
  .menu-toggle { display: inline-flex; }
  .field input, .field textarea, .field select { font-size: 16px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  section.block { padding: 72px 0; }
  .hero { min-height: 92vh; padding: 120px 0 90px; }
  .hero-stats { gap: 18px; }
  .hero-stat { flex: 1 1 42%; padding-right: 0; }
  .brand-mark { width: 40px; height: 40px; }
  .brand-name { font-size: 21px; }
  .brand-sub { font-size: 8px; letter-spacing: 2px; }
  .flow { grid-template-columns: 1fr; }
  .cta-band { padding: 64px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .solution-media img, .about-media img { height: 300px; }
  .tl-row { grid-template-columns: 70px 34px 1fr; }
}