/* ============================================================
   包头市昭阳科技有限公司 · 官网样式
   结构：变量 → 基础 → 布局 → 组件 → 各区块 → 响应式
   改配色只需改 :root 里的变量
   ============================================================ */

/* ---------- 变量 ---------- */
:root {
  --ink: #0a1a2f;
  --ink-soft: #23364d;
  --muted: #5c7189;
  --line: #e2e9f3;
  --bg: #ffffff;
  --bg-alt: #f4f8fd;
  --accent: #0b4fc4;
  --accent-dark: #073d9b;
  --accent-soft: #e8f1ff;
  --accent-2: #00a6c0;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(10, 26, 47, .05), 0 4px 14px rgba(10, 26, 47, .04);
  --shadow-md: 0 12px 34px rgba(10, 26, 47, .1);
  --container: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
          "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  color: var(--ink);
  line-height: 1.25;
  letter-spacing: -.02em;
  margin: 0 0 .5em;
  font-weight: 650;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.7rem); letter-spacing: -.035em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.35rem); }
h3 { font-size: 1.12rem; }
h4 { font-size: .98rem; margin-bottom: .35em; }

p { margin: 0 0 1rem; }
a { color: var(--accent); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--accent-dark); }
img, svg { max-width: 100%; }
ul { margin: 0; padding: 0; list-style: none; }
::selection { background: rgba(11, 79, 196, .15); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: .7rem 1.1rem;
  border-radius: 0 0 8px 0;
  z-index: 999;
}
.skip-link:focus { left: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* ---------- 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.section { padding: clamp(60px, 8vw, 104px) 0; }
.section-alt { background: var(--bg-alt); }

.section-head { max-width: 740px; margin-bottom: clamp(32px, 4.5vw, 54px); }

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: .85rem;
}

.section-lead { font-size: 1.04rem; color: var(--muted); margin: 0; }

.text-link { font-weight: 600; font-size: .95rem; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.site-header.is-scrolled { border-bottom-color: var(--line); box-shadow: 0 4px 20px rgba(10, 26, 47, .05); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  color: var(--ink);
}
.brand:hover { color: var(--ink); }
.brand-mark { display: flex; color: var(--accent); }
.brand-wrap { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text { font-weight: 700; font-size: 1.1rem; letter-spacing: -.01em; }
.brand-sub {
  font-size: .56rem;
  letter-spacing: .18em;
  color: #93a6bd;
  font-weight: 600;
  margin-top: 2px;
}

.nav { display: flex; align-items: center; gap: 1.7rem; }

.nav a {
  position: relative;
  color: var(--ink-soft);
  font-size: .93rem;
  font-weight: 500;
  padding: .35rem 0;
  white-space: nowrap;
}
.nav a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: width .22s ease;
}
.nav a:not(.nav-cta):hover::after { width: 100%; }

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: .6rem 1.15rem !important;
  border-radius: 999px;
  font-weight: 600;
  box-shadow: 0 6px 16px rgba(11, 79, 196, .22);
  transition: background .2s ease, transform .2s ease;
}
.nav-cta:hover { background: var(--accent-dark); transform: translateY(-1px); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0 9px;
  background: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .25s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 9vw, 112px) 0 clamp(48px, 7vw, 84px);
  background:
    radial-gradient(1100px 520px at 80% -12%, #e4eeff 0%, rgba(228, 238, 255, 0) 60%),
    linear-gradient(180deg, #fafcff 0%, #ffffff 80%);
}

.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  right: -170px;
  top: -230px;
  background: radial-gradient(circle, rgba(0, 166, 192, .16), rgba(0, 166, 192, 0) 68%);
  pointer-events: none;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(11, 79, 196, .05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(11, 79, 196, .05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 75% 60% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 75% 60% at 50% 0%, #000 20%, transparent 78%);
  pointer-events: none;
}

.hero-inner { position: relative; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-size: .83rem;
  font-weight: 550;
  color: var(--ink-soft);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .36rem .9rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.hero .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 4px rgba(0, 166, 192, .16);
}

.hero h1 { max-width: 18ch; margin-bottom: 1.1rem; }

.grad {
  background: linear-gradient(100deg, var(--accent) 6%, var(--accent-2) 94%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  max-width: 56ch;
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  color: var(--muted);
  margin-bottom: 1.9rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-bottom: clamp(40px, 6vw, 68px);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .82rem 1.5rem;
  font-size: .96rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .22s ease, background .2s ease, color .2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 18px rgba(11, 79, 196, .24);
}
.btn-primary:hover {
  background: var(--accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(11, 79, 196, .3);
}

.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: #c6d5e8; color: var(--ink); transform: translateY(-2px); box-shadow: var(--shadow-sm); }

.btn-sm { padding: .62rem 1.1rem; font-size: .88rem; }
.btn-block { width: 100%; }

/* ---------- 首屏数据 ---------- */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.hero-stats > div { background: #fff; padding: 1.35rem 1.15rem; }
.hero-stats dt {
  font-size: clamp(1.45rem, 2.5vw, 1.95rem);
  font-weight: 680;
  color: var(--ink);
  letter-spacing: -.03em;
  line-height: 1.2;
  margin-bottom: .25rem;
}
.hero-stats dd { margin: 0; font-size: .85rem; color: var(--muted); }

/* ---------- 核心能力 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
}

.feature {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.55rem 1.4rem;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: #cfdcee; }
.feature h3 { margin-bottom: .35rem; font-size: 1.05rem; }
.feature p { margin: 0; font-size: .92rem; color: var(--muted); }

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: .95rem;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent);
}

/* ---------- 走进昭阳 ---------- */
.about-split {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.about-split p { color: var(--ink-soft); font-size: .98rem; }

.about-points { margin-top: 1.4rem; display: grid; gap: .6rem; }
.about-points li {
  position: relative;
  padding-left: 1.5rem;
  font-size: .93rem;
  color: var(--ink-soft);
}
.about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.name-card {
  background: linear-gradient(170deg, #0a2e5c 0%, #0b4fc4 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: clamp(1.6rem, 3vw, 2.1rem);
  box-shadow: 0 18px 40px rgba(10, 46, 92, .22);
}
.name-card-title,
.about-split .name-card-title {
  font-size: .82rem;
  letter-spacing: .16em;
  color: rgba(255, 255, 255, .62);
  margin-bottom: .8rem;
}
.name-card-motto,
.about-split .name-card-motto {
  font-size: 1.02rem;
  line-height: 1.6;
  color: #fff;
  margin-bottom: 1.4rem;
  padding-bottom: 1.3rem;
  border-bottom: 1px solid rgba(255, 255, 255, .16);
}
.name-card dl { margin: 0; display: grid; gap: .85rem; }
.name-card dl > div { display: grid; grid-template-columns: 5.4em 1fr; gap: .8rem; }
.name-card dt { font-size: .82rem; color: rgba(255, 255, 255, .55); }
.name-card dd { margin: 0; font-size: .88rem; color: rgba(255, 255, 255, .95); line-height: 1.55; }

/* ---------- 产品中心 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
}

.product {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.7rem 1.5rem;
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease;
}
.product::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s ease;
}
.product:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.product:hover::before { transform: scaleX(1); }

.product-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  margin-bottom: 1.05rem;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
}

.product h3 { font-size: 1.08rem; margin-bottom: .55rem; }
.product p { font-size: .92rem; color: var(--muted); margin-bottom: 1rem; }

.tag-list { display: flex; flex-wrap: wrap; gap: .4rem; }
.tag-list li {
  font-size: .76rem;
  font-weight: 550;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: .18rem .62rem;
}

.product-cta {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: .3rem;
  background: linear-gradient(160deg, #eef4ff, #f4fbfd);
  border: 1px dashed #c3d6ef;
  border-radius: var(--radius-lg);
  padding: 1.7rem 1.5rem;
}
.product-cta h3 { margin-bottom: .1rem; }
.product-cta p { color: var(--muted); font-size: .9rem; margin-bottom: 1rem; }

/* ---------- 解决方案 ---------- */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.solution {
  background: #fff;
  padding: 1.6rem 1.5rem;
  transition: background .2s ease;
}
.solution:hover { background: #fbfdff; }
.solution-no {
  display: block;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: #b3c5db;
  margin-bottom: .7rem;
}
.solution h3 { font-size: 1.04rem; margin-bottom: .45rem; }
.solution p { margin: 0; font-size: .9rem; color: var(--muted); }

.solution-cta { background: var(--accent-soft); }
.solution-cta h3 { color: var(--accent-dark); }
.solution-cta p { color: #37567d; margin-bottom: .8rem; }

/* ---------- 案例 ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.case-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.25rem;
  transition: transform .22s ease, box-shadow .22s ease;
}
.case-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.case-loc {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  color: var(--accent-2);
  background: #eafafc;
  border-radius: 999px;
  padding: .1rem .55rem;
  margin-bottom: .65rem;
}

.case-card h3 { font-size: 1rem; margin-bottom: .3rem; }
.case-card p:last-child { margin: 0; font-size: .84rem; color: var(--muted); }

.cases-more {
  margin: 1.6rem 0 0;
  font-size: .9rem;
  color: var(--muted);
  padding-top: 1.2rem;
  border-top: 1px dashed var(--line);
}
.cases-more strong { color: var(--accent); }

/* ---------- 5S 服务 ---------- */
.s5-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: .9rem;
  margin-bottom: clamp(40px, 6vw, 64px);
}

.s5 {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.15rem;
  transition: transform .22s ease, box-shadow .22s ease;
}
.s5:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.s5-letter {
  display: block;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--accent);
  margin-bottom: .7rem;
}
.s5 h3 { font-size: 1rem; margin-bottom: .35rem; }
.s5 p { margin: 0; font-size: .84rem; color: var(--muted); line-height: 1.6; }

/* ---------- 企业文化 ---------- */
.culture {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2.2rem);
}

.culture-kicker {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: .7rem;
}

.culture-line {
  font-size: .93rem;
  color: var(--muted);
  padding-bottom: 1.4rem;
  margin-bottom: 1.4rem;
  border-bottom: 1px solid var(--line);
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4rem 2rem;
}
.culture-grid h4 {
  color: var(--ink);
  font-size: .96rem;
  margin-bottom: .35rem;
  padding-left: .8rem;
  border-left: 3px solid var(--accent-2);
  line-height: 1.2;
}
.culture-grid p { margin: 0; font-size: .87rem; color: var(--muted); padding-left: .95rem; }

/* ---------- 联系 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
  margin: 1.6rem 0 1.4rem;
}

.contact-card {
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  color: var(--ink);
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.contact-card:hover {
  border-color: #bcd2ee;
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
  color: var(--ink);
}

.contact-label {
  display: block;
  font-size: .76rem;
  color: var(--muted);
  margin-bottom: .25rem;
}
.contact-card strong {
  display: block;
  font-size: 1.06rem;
  color: var(--accent);
  letter-spacing: -.01em;
  font-variant-numeric: tabular-nums;
}
.contact-card em {
  display: block;
  font-style: normal;
  font-size: .74rem;
  color: var(--muted);
  margin-top: .15rem;
}

.contact-list { display: grid; gap: .9rem; }
.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  font-size: .92rem;
  color: var(--ink-soft);
}
.contact-list svg { color: var(--accent); flex: none; margin-top: .25rem; }

.contact-form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(1.4rem, 3vw, 2rem);
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: .95rem;
}

.form-title {
  font-size: 1.12rem;
  font-weight: 650;
  color: var(--ink);
  margin: 0 0 .2rem;
}

.field { display: grid; gap: .35rem; }
.field label { font-size: .84rem; font-weight: 600; color: var(--ink-soft); }

.field input,
.field textarea,
.field select {
  width: 100%;
  font-family: inherit;
  font-size: .94rem;
  color: var(--ink);
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: .7rem .9rem;
  transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
}

.field textarea { resize: vertical; min-height: 104px; }

.field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%235c7189' stroke-width='2.4' stroke-linecap='round'%3E%3Cpath d='M5 9l7 7 7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .9rem center;
  padding-right: 2.3rem;
  cursor: pointer;
}

.field input::placeholder,
.field textarea::placeholder { color: #9fb0c4; }

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  background: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(11, 79, 196, .12);
}

.field input.is-invalid,
.field textarea.is-invalid {
  border-color: #d94a4a;
  box-shadow: 0 0 0 3px rgba(217, 74, 74, .1);
}

.form-note { margin: 0; font-size: .85rem; min-height: 1.25em; color: var(--muted); }
.form-note.is-ok { color: #0f8a63; }
.form-note.is-err { color: #c33; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #071426;
  color: rgba(255, 255, 255, .6);
  padding: clamp(42px, 6vw, 62px) 0 26px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, .09);
}

.footer-brand .brand-text { color: #fff; font-size: 1.02rem; }
.footer-brand p {
  margin: .7rem 0 0;
  font-size: .85rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, .48);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}
.footer-cols h4 {
  color: #fff;
  font-size: .88rem;
  margin-bottom: .8rem;
  font-weight: 600;
}
.footer-cols a,
.footer-cols p {
  display: block;
  color: rgba(255, 255, 255, .58);
  font-size: .84rem;
  margin: 0 0 .45rem;
  line-height: 1.6;
}
.footer-cols a:hover { color: #fff; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.4rem;
  font-size: .8rem;
  color: rgba(255, 255, 255, .35);
}

/* ---------- 移动端悬浮条 ---------- */
.sticky-call {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  gap: .6rem;
  padding: .6rem .9rem calc(.6rem + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
}
.sticky-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .72rem .5rem;
  border-radius: 10px;
  font-size: .92rem;
  font-weight: 600;
}
.sticky-call-btn {
  background: #fff;
  color: var(--accent);
  border: 1px solid #c3d6ef;
}
.sticky-plan-btn { background: var(--accent); color: #fff; }
.sticky-plan-btn:hover { color: #fff; }

/* ---------- 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s cubic-bezier(.22, .61, .36, 1),
              transform .6s cubic-bezier(.22, .61, .36, 1);
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .solution-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .s5-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .about-split { grid-template-columns: 1fr; }
  .culture-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 1.8rem; }
}

@media (max-width: 900px) {
  .header-inner { height: 68px; }
  .nav-toggle { display: flex; }

  .nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 34px rgba(10, 26, 47, .1);
    padding: .4rem 24px 1.1rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
  }
  .nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav a { padding: .82rem 0; border-bottom: 1px solid #f1f5fa; }
  .nav a:not(.nav-cta)::after { display: none; }
  .nav-cta { margin-top: .8rem; text-align: center; border-bottom: none !important; }

  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .sticky-call { display: flex; }
  body { padding-bottom: 64px; }
}

@media (max-width: 620px) {
  .container { padding-inline: 18px; }
  .hero-actions .btn { width: 100%; }
  .feature-grid,
  .product-grid,
  .solution-grid,
  .case-grid { grid-template-columns: 1fr; }
  .s5-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .culture-grid { grid-template-columns: 1fr; }
  .contact-cards { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr; gap: 1.2rem; }
  .brand-sub { display: none; }
  .name-card dl > div { grid-template-columns: 4.6em 1fr; }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 打印 ---------- */
@media print {
  .site-header, .sticky-call, .contact-form, .nav-toggle { display: none !important; }
  body { color: #000; padding-bottom: 0; }
  .reveal { opacity: 1; transform: none; }
  .name-card { background: #f2f5f9 !important; color: #000 !important; }
  .name-card dt, .name-card dd, .name-card-motto { color: #000 !important; }
}