/* ==========================================================================
   SlotLink 官网 v6 · 品牌官网
   范式：企业品牌站（Sea Dreams 式）——大图宣言 + 品牌支柱 + 公司叙事 + 克制的产品概览
   零外部依赖：系统字体栈，无远程资源
   ========================================================================== */

:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --blue-deep: #1e3a8a;
  --navy: #0f172a;
  --ink: #1e293b;
  --muted: #5b6b7c;
  --muted-light: #94a3b8;
  --line: #e2e8f0;
  --line-light: #eef2f7;
  --bg-soft: #f7f9fc;
  --bg-blue: #eff6ff;
  --white: #ffffff;
  --radius: 14px;
  --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.05);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, "Segoe UI", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  min-width: 320px;
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

.shell { width: min(1120px, calc(100% - 48px)); margin: 0 auto; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--navy); color: #fff; padding: 8px 16px; z-index: 99;
}
.skip-link:focus { left: 0; }

/* ============ 导航 ============ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-light);
}
.nav-shell { display: flex; align-items: center; gap: 32px; min-height: 68px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 20px; color: var(--navy); }
.brand-mark { width: 26px; height: 26px; stroke: var(--blue); fill: none; stroke-width: 2; }
.nav-links { display: flex; gap: 30px; margin-left: auto; font-size: 15px; color: var(--ink); }
.nav-links a { padding: 6px 0; transition: color 0.2s; }
.nav-links a:hover { color: var(--blue); }
.nav-cta {
  background: var(--blue); color: #fff; font-size: 14.5px; font-weight: 600;
  padding: 10px 26px; border-radius: 999px; white-space: nowrap;
  transition: all 0.2s;
}
.nav-cta:hover { background: var(--blue-dark); }

/* ============ Hero：品牌宣言 ============ */
.hero {
  position: relative; overflow: hidden;
  min-height: max(600px, 86vh);
  display: flex; flex-direction: column; justify-content: center;
  color: #fff;
}
.hero-photo {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: center 42%;
}
.hero-veil {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(6, 15, 28, 0.66) 0%, rgba(8, 21, 39, 0.5) 46%, rgba(6, 15, 28, 0.74) 100%);
}
.hero-inner { position: relative; z-index: 1; padding: 120px 0 90px; }
.hero-kicker {
  font-size: 13px; letter-spacing: 0.3em; font-weight: 500;
  color: #bcd3f2; margin-bottom: 30px;
}
.hero h1 {
  font-size: clamp(44px, 7vw, 84px);
  font-weight: 700; line-height: 1.22; letter-spacing: 0.04em;
  margin-bottom: 26px;
  text-shadow: 0 3px 34px rgba(3, 10, 20, 0.5);
}
.hero-sub {
  font-size: clamp(16px, 2vw, 20px); color: #d6e3f5;
  letter-spacing: 0.14em; margin-bottom: 46px;
}
.button {
  display: inline-block; font-size: 15.5px; font-weight: 600;
  padding: 14px 36px; border-radius: 8px; transition: all 0.22s;
  letter-spacing: 0.03em;
}
.button-primary { background: var(--blue); color: #fff; }
.button-primary:hover { background: var(--blue-dark); transform: translateY(-1px); box-shadow: 0 14px 32px rgba(37, 99, 235, 0.35); }
.button-invert { background: #fff; color: var(--blue-deep); font-size: 16.5px; }
.button-invert:hover { transform: translateY(-1px); box-shadow: 0 12px 30px rgba(3, 10, 20, 0.35); }

/* ============ 通用 section ============ */
.section { padding: 108px 0; }
.section-tint { background: var(--bg-soft); }
.eyebrow {
  font-size: 12.5px; letter-spacing: 0.26em; font-weight: 600;
  color: var(--blue); margin-bottom: 16px;
}
.section-head { text-align: center; max-width: 760px; margin: 0 auto 60px; }
.section-head h2 { font-size: clamp(27px, 3.4vw, 38px); color: var(--navy); line-height: 1.42; }
.section-sub { margin-top: 16px; color: var(--muted); font-size: 15.5px; }

/* ============ 核心优势 ============ */
.strength-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
}
.strength-card { padding: 46px 40px 12px 0; }
.strength-card + .strength-card { border-left: 1px solid var(--line); padding-left: 40px; }
.strength-no { font-size: 13px; font-weight: 700; color: var(--blue); letter-spacing: 0.14em; }
.strength-card h3 { font-size: 23px; color: var(--navy); margin: 14px 0 12px; letter-spacing: 0.02em; }
.strength-card p { font-size: 14.5px; color: var(--muted); }

/* ============ 数字 ============ */
.stats-band {
  background: linear-gradient(120deg, var(--blue-deep) 0%, var(--blue) 100%);
  color: #fff; padding: 72px 0;
}
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; text-align: center; }
.stats-row b { display: block; font-size: clamp(34px, 4.2vw, 50px); line-height: 1.1; }
.stats-row span { display: block; margin-top: 10px; font-size: 14px; letter-spacing: 0.06em; color: #d5e4fb; }

/* ============ 产品三卡 ============ */
.promise-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-bottom: 40px; }
.promise-card {
  background: #fff; border: 1px solid var(--line-light); border-radius: var(--radius);
  padding: 32px 28px; border-top: 3px solid var(--blue);
  box-shadow: var(--shadow-card);
}
.promise-card h3 { font-size: 19px; color: var(--navy); margin-bottom: 12px; }
.promise-card p { font-size: 14px; color: var(--muted); }

/* ============ Hero 双按钮与底部 ============ */
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.button-outline { color: #e4edf9; border: 1px solid rgba(196, 211, 230, 0.55); }
.button-outline:hover { border-color: #fff; color: #fff; }
.hero-foot {
  position: relative; z-index: 1;
  display: flex; justify-content: space-between; gap: 20px;
  margin-top: 84px;
  font-size: 12.5px; letter-spacing: 0.1em; color: #93a7c0;
}
.deploy-note { margin-top: 22px; font-size: 12.5px; color: #7d92ad; }

/* ============ 关于我们 ============ */
.about-grid {
  display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.3fr);
  gap: 68px; align-items: start;
}
.about-head h2 { font-size: clamp(26px, 3.2vw, 36px); color: var(--navy); line-height: 1.42; }
.about-body { display: grid; gap: 18px; }
.about-body p { font-size: 15.5px; color: var(--muted); }
.about-body p:first-child { font-size: 17px; color: var(--ink); }

/* ============ 产品概览 ============ */
.product-inner { text-align: center; }
.product-inner .section-head { margin-bottom: 52px; }
.chain {
  display: flex; align-items: center; justify-content: center; gap: 16px;
  margin-bottom: 46px; flex-wrap: wrap;
}
.chain span {
  font-size: clamp(16px, 2.2vw, 20px); font-weight: 700;
  color: var(--navy); letter-spacing: 0.14em;
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 10px 26px; box-shadow: var(--shadow-card);
}
.chain i { flex: none; width: clamp(20px, 3.5vw, 46px); height: 1px; background: #b9c8da; position: relative; }
.chain i::after {
  content: ""; position: absolute; right: 0; top: -2.5px;
  width: 6px; height: 6px; border-top: 1px solid #b9c8da; border-right: 1px solid #b9c8da;
  transform: rotate(45deg);
}
.product-note { font-size: 15px; color: var(--muted); margin-bottom: 30px; }
.text-link {
  color: var(--blue); font-weight: 600; font-size: 15.5px;
  border-bottom: 1px solid rgba(37, 99, 235, 0.35); padding-bottom: 3px;
  transition: all 0.2s;
}
.text-link:hover { color: var(--blue-dark); border-color: var(--blue-dark); }

/* ============ 服务与交付（深蓝章） ============ */
.section-deep { background: var(--navy); color: #dce7f5; }
.deploy-grid { display: grid; grid-template-columns: 1fr 1.12fr; gap: 64px; align-items: start; }
.deploy-copy h2 { font-size: clamp(25px, 3vw, 33px); color: #fff; line-height: 1.45; margin-bottom: 18px; }
.deploy-copy > p { font-size: 15px; color: #a9bdd6; margin-bottom: 24px; }
.deploy-link {
  color: #93c5fd; font-weight: 600; font-size: 15px;
  border-bottom: 1px solid rgba(147, 197, 253, 0.4); padding-bottom: 3px;
  transition: all 0.2s;
}
.deploy-link:hover { color: #fff; border-color: #fff; }
.deploy-list { display: grid; gap: 16px; }
.deploy-list li {
  display: flex; gap: 18px; align-items: flex-start;
  background: rgba(255, 255, 255, 0.045); border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: var(--radius); padding: 20px 22px;
}
.deploy-list span {
  flex: none; display: grid; place-items: center;
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(37, 99, 235, 0.28); color: #93c5fd; font-weight: 700; font-size: 14px;
}
.deploy-list h3 { font-size: 16.5px; color: #fff; margin-bottom: 5px; }
.deploy-list p { font-size: 13.5px; color: #a9b8cd; line-height: 1.65; }

/* ============ 隐私声明 ============ */
.privacy-note {
  text-align: center; font-size: 13px; color: var(--muted);
  background: var(--bg-soft); border: 1px dashed var(--line);
  border-radius: 10px; padding: 13px 18px; max-width: 720px; margin: 0 auto;
}
.privacy-note strong { color: var(--ink); }

/* ============ CTA ============ */
.finale {
  background:
    radial-gradient(800px 360px at 24% -8%, rgba(96, 165, 250, 0.28), transparent 65%),
    linear-gradient(120deg, var(--blue-deep), var(--blue));
  color: #fff; text-align: center;
  padding: 108px 0 116px;
}
.finale-inner { max-width: 780px; }
.finale h2 { font-size: clamp(25px, 3.4vw, 36px); line-height: 1.45; margin-bottom: 20px; }
.finale p { color: #d8e6fc; font-size: 15.5px; margin-bottom: 38px; }
.finale small { display: block; margin-top: 16px; font-size: 12.5px; color: #b7cdf5; }

/* ============ 页脚 ============ */
.site-footer { background: var(--navy); color: #8fa0b3; padding: 50px 0; }
.footer-row {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 32px; flex-wrap: wrap;
}
.footer-brand { font-size: 18px; margin-bottom: 10px; color: #fff; }
.footer-brand .brand-mark { stroke: #93c5fd; }
.footer-row > div > p { font-size: 13px; color: #62778f; line-height: 1.9; }
.footer-row nav { display: flex; gap: 24px; font-size: 13.5px; flex-wrap: wrap; }
.footer-row nav a:hover { color: #fff; }
.footer-contact { display: grid; gap: 6px; font-size: 13.5px; text-align: right; }
.footer-contact a { color: #93c5fd; font-weight: 600; }
.footer-contact a:hover { color: #fff; }
.footer-contact span { color: #62778f; font-size: 12.5px; }
.footer-contact .beian { color: #62778f; font-weight: 400; }
.footer-contact .beian:hover { color: #fff; }

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .section { padding: 84px 0; }
  .promise-grid { grid-template-columns: 1fr; }
  .strength-grid { grid-template-columns: 1fr; border-top: none; }
  .strength-card { padding: 32px 0 14px; border-top: 1px solid var(--line); }
  .strength-card + .strength-card { border-left: none; padding-left: 0; }
  .stats-row { gap: 30px 14px; }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
  .deploy-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-contact { text-align: left; }
}

@media (max-width: 620px) {
  .shell { width: calc(100% - 40px); }
  .nav-links { display: none; }
  .hero { min-height: max(520px, 78vh); }
  .hero-inner { padding: 100px 0 70px; }
  .hero h1 { letter-spacing: 0.02em; }
  .hero .button { width: 100%; text-align: center; }
  .hero-actions { width: 100%; }
  .hero-foot { flex-direction: column; gap: 6px; margin-top: 60px; }
  .chain { gap: 10px; }
  .chain span { padding: 8px 18px; }
  .finale .button { width: 100%; }
}