/* ============================================================
   斯派德官网 · 全局样式（纯 CSS，无构建）
   品牌规范见 PRD：主色 #0E3A5C / 辅色 #0FB894 / 强调 #FF7A2F / 墨 #142A38
   断点：≥1200 桌面 / 768~1199 平板 / <768 手机
   ============================================================ */
:root {
  --c-primary: #0E3A5C;
  --c-accent2: #0FB894;
  --c-orange: #FF7A2F;
  --c-ink: #142A38;
  --c-ink-60: rgba(20, 42, 56, 0.6);
  --c-ink-40: rgba(20, 42, 56, 0.4);
  --c-bg-soft: rgba(14, 58, 92, 0.05);
  --c-bg-soft2: rgba(15, 184, 148, 0.06);
  --c-line: rgba(20, 42, 56, 0.1);
  --c-white: #ffffff;
  --font-num: "DIN Next LT Pro", "Bahnschrift", Arial, sans-serif;
  --shadow-card: 0 4px 20px rgba(14, 58, 92, 0.08);
  --radius: 10px;
  --container: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--c-ink);
  background: var(--c-white);
  font-size: 15px;
  line-height: 1.75;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s ease;
  border: 1px solid transparent;
  text-align: center;
}
.btn-primary { background: var(--c-orange); color: #fff; }
.btn-primary:hover { background: #e8671f; transform: translateY(-2px); }
.btn-ghost { border-color: rgba(255,255,255,.6); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); }
.btn-line { border-color: var(--c-primary); color: var(--c-primary); }
.btn-line:hover { background: var(--c-primary); color: #fff; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: transparent;
  transition: background .25s ease, box-shadow .25s ease;
}
.site-header.scrolled {
  background: #fff;
  box-shadow: 0 2px 12px rgba(14, 58, 92, 0.12);
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto; padding: 0 24px;
  height: 72px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo { display: flex; align-items: baseline; gap: 10px; }
.logo-mark {
  font-family: var(--font-num);
  font-size: 28px; font-weight: 700; letter-spacing: 2px;
  color: #fff; transition: color .25s;
}
.logo-mark em { font-style: normal; color: var(--c-accent2); }
.logo-sub { font-size: 12px; color: rgba(255,255,255,.75); transition: color .25s; }
.site-header.scrolled .logo-mark { color: var(--c-primary); }
.site-header.scrolled .logo-sub { color: var(--c-ink-60); }

.nav { display: flex; align-items: center; gap: 34px; }
.nav a {
  font-size: 15px; color: rgba(255,255,255,.88);
  padding: 6px 0; position: relative; transition: color .2s;
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 2px; background: var(--c-accent2); transition: width .2s;
}
.nav a:hover::after, .nav a.active::after { width: 100%; }
.nav a.active { color: var(--c-accent2); font-weight: 600; }
.site-header.scrolled .nav a { color: var(--c-ink); }
.site-header.scrolled .nav a.active { color: var(--c-accent2); }
.nav-cta {
  background: var(--c-orange); color: #fff !important;
  padding: 9px 22px !important; border-radius: 5px; font-weight: 600;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: #e8671f; }

.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.hamburger span {
  display: block; width: 24px; height: 2px; background: #fff; margin: 6px 0;
  transition: all .25s;
}
.site-header.scrolled .hamburger span { background: var(--c-primary); }
.site-header.menu-open .hamburger span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.site-header.menu-open .hamburger span:nth-child(2) { opacity: 0; }
.site-header.menu-open .hamburger span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- 主内容顶部留出导航高度 ---------- */
main { padding-top: 72px; }
/* 深色首屏页：hero 顶到最上方，导航透明悬浮其上 */
body.has-dark-hero main { padding-top: 0; }
body.has-dark-hero .hero { padding-top: 168px; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, #0B2E4A 0%, var(--c-primary) 55%, #14507E 100%);
  color: #fff;
  padding: 96px 0 88px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; right: -160px; top: -120px;
  width: 480px; height: 480px; border-radius: 50%;
  background: radial-gradient(circle, rgba(15,184,148,.25) 0%, transparent 70%);
}
.hero-kicker {
  font-size: 13px; letter-spacing: 4px; text-transform: uppercase;
  color: var(--c-accent2); margin-bottom: 18px; font-weight: 600;
}
.hero h1 { font-size: 42px; line-height: 1.25; margin-bottom: 14px; }
.hero h2.sub { font-size: 24px; font-weight: 500; color: rgba(255,255,255,.9); margin-bottom: 20px; }
.hero p.desc {
  font-size: 16px; color: rgba(255,255,255,.82); max-width: 640px; margin-bottom: 36px;
}
.hero .btn + .btn { margin-left: 14px; }
.hero-plain {
  background: var(--c-bg-soft);
  color: var(--c-ink);
  padding: 72px 0 56px;
}
.hero-plain::before { display: none; }
.hero-plain .hero-kicker { color: var(--c-accent2); }
.hero-plain h1 { color: var(--c-primary); }
.hero-plain h2.sub { color: var(--c-ink-60); }
.hero-plain p.desc { color: var(--c-ink-60); }

/* ---------- 通用 Section ---------- */
.section { padding: 76px 0; }
.section.alt { background: var(--c-bg-soft); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.section-head .kicker {
  font-size: 13px; letter-spacing: 3px; color: var(--c-accent2);
  font-weight: 600; text-transform: uppercase; margin-bottom: 10px;
}
.section-head h2 { font-size: 30px; color: var(--c-primary); line-height: 1.3; margin-bottom: 12px; }
.section-head p { color: var(--c-ink-60); font-size: 15px; }

/* ---------- 数字锚点条 ---------- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.stat { text-align: center; padding: 10px; }
.stat .num {
  font-family: var(--font-num);
  font-size: 62px; font-weight: 700; color: var(--c-orange); line-height: 1.1;
}
.stat .num small { font-size: 28px; font-weight: 600; margin-left: 2px; }
.stat .label { margin-top: 6px; font-size: 15px; color: var(--c-ink-60); }

/* ---------- 卡片网格 ---------- */
.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-radius: var(--radius);
  border: 1px solid var(--c-line);
  padding: 30px 26px;
  transition: transform .2s ease, box-shadow .2s ease;
}
.section.alt .card { border-color: transparent; box-shadow: var(--shadow-card); }
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(14, 58, 92, 0.14); }
.card .tag {
  display: inline-block; font-size: 12px; color: var(--c-accent2);
  background: var(--c-bg-soft2); border-radius: 4px; padding: 2px 10px; margin-bottom: 12px;
}
.card h3 { font-size: 18px; color: var(--c-primary); margin-bottom: 10px; }
.card p { font-size: 14px; color: var(--c-ink-60); }
.card .idx {
  font-family: var(--font-num); font-size: 15px; font-weight: 700;
  color: var(--c-orange); margin-bottom: 8px; display: block;
}
.card ul.points { margin-top: 14px; }
.card ul.points li {
  position: relative; padding-left: 18px;
  font-size: 14px; color: var(--c-ink-60); margin-bottom: 7px; line-height: 1.6;
}
.card ul.points li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 7px; height: 7px; border-radius: 2px; background: var(--c-accent2);
}

/* ---------- 步骤条 ---------- */
.steps { display: flex; gap: 0; }
.step { flex: 1; position: relative; text-align: center; padding: 0 8px; }
.step::before {
  content: ""; position: absolute; top: 17px;
  left: calc(50% + 28px); width: calc(100% - 56px);
  height: 2px; background: var(--c-line);
}
.step:last-child::before { display: none; }
.step .dot {
  position: relative; z-index: 1;
  width: 36px; height: 36px; margin: 0 auto 12px;
  border-radius: 50%; background: var(--c-primary); color: #fff;
  font-family: var(--font-num); font-size: 15px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step .dot.orange { background: var(--c-orange); }
.step .name { font-size: 15px; font-weight: 600; color: var(--c-primary); }
.step .desc { font-size: 12.5px; color: var(--c-ink-40); margin-top: 4px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
table.spec { width: 100%; border-collapse: collapse; background: #fff; }
table.spec th, table.spec td {
  border: 1px solid var(--c-line);
  padding: 12px 16px; font-size: 14px; text-align: left; vertical-align: top;
}
table.spec th { background: var(--c-primary); color: #fff; font-weight: 600; white-space: nowrap; }
table.spec tr:nth-child(even) td { background: var(--c-bg-soft); }
table.spec td.lv { font-weight: 700; color: var(--c-orange); white-space: nowrap; }
.table-note { margin-top: 12px; font-size: 13px; color: var(--c-ink-40); }

/* ---------- Logo 墙 ---------- */
.logo-wall { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.logo-item {
  height: 72px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--c-line); border-radius: 8px;
  background: #fff; padding: 10px 14px;
  filter: grayscale(1); opacity: .75; transition: all .2s;
  text-align: center;
}
.logo-item:hover { filter: grayscale(0); opacity: 1; box-shadow: var(--shadow-card); }
.logo-item img { max-height: 44px; width: auto; object-fit: contain; }
.logo-item .logo-text {
  font-size: 15px; font-weight: 700; color: var(--c-primary); letter-spacing: 1px;
}

/* ---------- 案例卡 ---------- */
.case-card { display: block; }
.case-card .case-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.case-card .case-tags span {
  font-size: 12px; color: var(--c-primary); background: var(--c-bg-soft);
  border-radius: 4px; padding: 2px 10px;
}
.case-card .arrow { color: var(--c-orange); font-weight: 600; font-size: 14px; margin-top: 14px; display: inline-block; }

/* ---------- 案例快速切换栏 ---------- */
.case-switch { display: flex; flex-wrap: wrap; gap: 10px; margin: 4px 0 26px; }
.case-switch a {
  padding: 8px 20px; border-radius: 20px;
  border: 1px solid var(--c-line);
  font-size: 14px; color: var(--c-ink-60);
  transition: all .2s ease;
}
.case-switch a:hover { border-color: var(--c-accent2); color: var(--c-accent2); }
.case-switch a.active {
  background: var(--c-primary); border-color: var(--c-primary);
  color: #fff; font-weight: 600;
}
.case-switch a.switch-all { border-style: dashed; }

/* ---------- 案例配图 ---------- */
.case-figure { margin: 8px 0 6px; }
.case-figure img {
  width: 100%; height: auto; display: block;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-card);
  background: #fff;
}
.case-figure figcaption {
  margin-top: 10px; text-align: center;
  font-size: 12.5px; color: var(--c-ink-40);
}

/* ---------- 富文本段落 ---------- */
.rich p { margin-bottom: 14px; color: var(--c-ink-60); font-size: 15px; }
.rich strong { color: var(--c-primary); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 32px; align-items: stretch; }
.contact-card {
  background: var(--c-primary); color: #fff; border-radius: var(--radius);
  padding: 44px 40px; display: flex; flex-direction: column; justify-content: center;
}
.contact-card .who { font-size: 15px; color: rgba(255,255,255,.8); margin-bottom: 6px; }
.contact-card .phone {
  font-family: var(--font-num); font-size: 40px; font-weight: 700;
  color: #fff; letter-spacing: 1px; line-height: 1.3;
}
.contact-card .phone:hover { color: var(--c-accent2); }
.contact-card .tip { margin-top: 14px; font-size: 13.5px; color: rgba(255,255,255,.7); }
.contact-side .card { height: 100%; }
.contact-side .row { display: flex; gap: 12px; margin-bottom: 18px; align-items: flex-start; }
.contact-side .row .ic {
  flex: none; width: 34px; height: 34px; border-radius: 8px;
  background: var(--c-bg-soft2); color: var(--c-accent2);
  display: flex; align-items: center; justify-content: center; font-size: 16px;
}
.contact-side .row .k { font-size: 13px; color: var(--c-ink-40); }
.contact-side .row .v { font-size: 15px; color: var(--c-ink); font-weight: 500; }
.placeholder-text { color: var(--c-ink-40); font-style: normal; }

/* ---------- CTA 条 ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--c-primary), #14507E);
  color: #fff; text-align: center; padding: 64px 0;
}
.cta-band h2 { font-size: 28px; margin-bottom: 10px; }
.cta-band p { color: rgba(255,255,255,.8); margin-bottom: 28px; }
.cta-band .phone-inline {
  font-family: var(--font-num); font-size: 22px; color: var(--c-accent2);
  margin-left: 14px; font-weight: 700;
}

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-primary); color: rgba(255,255,255,.75); padding: 52px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-grid h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer-grid .comp { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.footer-grid p, .footer-grid li { font-size: 13.5px; line-height: 2; }
.footer-grid a:hover { color: var(--c-accent2); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.14);
  padding: 18px 0; text-align: center; font-size: 12.5px; color: rgba(255,255,255,.5);
}
.footer-bottom a { color: inherit; }
.footer-bottom a:hover { color: var(--c-accent2); }

/* ---------- 404 ---------- */
.nf404 { min-height: 60vh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px; padding: 40px 24px; text-align: center; }
.nf404-code { font-family: var(--font-num); font-size: 96px; font-weight: 700; color: var(--c-primary); }
.nf404-text { color: var(--c-ink-60); }

/* ---------- 响应式：平板 ---------- */
@media (max-width: 1199px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .logo-wall { grid-template-columns: repeat(4, 1fr); }
  .hero h1 { font-size: 36px; }
}

/* ---------- 响应式：手机 ---------- */
@media (max-width: 767px) {
  .container { padding: 0 18px; }
  main { padding-top: 60px; }
  .header-inner { height: 60px; }

  .hamburger { display: block; }
  .nav {
    display: none;
    position: absolute; top: 60px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    gap: 0; padding: 8px 18px 18px;
    box-shadow: 0 12px 24px rgba(14,58,92,.15);
  }
  .site-header.menu-open .nav { display: flex; }
  .nav a { color: var(--c-ink) !important; padding: 13px 4px; border-bottom: 1px solid var(--c-line); }
  .nav a::after { display: none; }
  .nav a.active { color: var(--c-accent2) !important; }
  .nav-cta { margin-top: 14px; text-align: center; border-bottom: none !important; }

  .hero { padding: 56px 0 52px; }
  body.has-dark-hero .hero { padding: 110px 0 52px; }
  .hero h1 { font-size: 28px; }
  .hero h2.sub { font-size: 19px; }
  .hero p.desc { font-size: 14.5px; }
  .hero .btn { width: 100%; }
  .hero .btn + .btn { margin-left: 0; margin-top: 12px; }

  .section { padding: 52px 0; }
  .section-head h2 { font-size: 24px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; gap: 30px; }
  .stat .num { font-size: 48px; }

  /* 步骤条纵向降级 */
  .steps { flex-direction: column; gap: 22px; }
  .step { text-align: left; display: flex; align-items: flex-start; gap: 14px; padding: 0; }
  .step::before { display: none; }
  .step .dot { margin: 0; }
  .step .txt { flex: 1; }

  .logo-wall { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-card .phone { font-size: 30px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
}