/* ==========================================================================
   秋涛智能企业官网 · 样式表
   设计取向：深色科技底色 + 品牌绿/橙点缀，克制用色，靠层次与动效表达质感
   ========================================================================== */

:root {
  --bg: #060a11;
  --bg-2: #0a1019;
  --panel: rgba(255, 255, 255, 0.035);
  --panel-hi: rgba(255, 255, 255, 0.07);
  --line: rgba(120, 170, 255, 0.14);
  --line-hi: rgba(120, 205, 255, 0.34);
  --txt: #e8eef8;
  --muted: #93a5bd;
  --green: #46c85a;
  --green-2: #7ce88b;
  --orange: #f2911f;
  --cyan: #4fd1e0;
  --radius: 14px;
  --wrap: 1200px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--txt);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* 全局网格底纹 + 顶部光晕 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 520px at 78% -8%, rgba(70, 200, 90, 0.14), transparent 62%),
    radial-gradient(760px 460px at 6% 4%, rgba(79, 209, 224, 0.1), transparent 60%),
    linear-gradient(180deg, #060a11 0%, #080d15 45%, #060a11 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(rgba(120, 170, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 170, 255, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 22%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 22%, #000 0%, transparent 78%);
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.3; margin: 0 0 0.6em; font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
ul, ol, dl, dd { margin: 0; padding: 0; list-style: none; }

.wrap { width: min(100% - 44px, var(--wrap)); margin-inline: auto; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--green); color: #04120a; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

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

/* ---------------------------------------------------------------- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 500; white-space: nowrap;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.btn-arrow { transition: transform 0.25s var(--ease); }
.btn:hover .btn-arrow { transform: translateX(4px); }

.btn-primary {
  color: #04160a;
  background: linear-gradient(135deg, var(--green-2), var(--green));
  box-shadow: 0 10px 30px -12px rgba(70, 200, 90, 0.75);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 38px -14px rgba(70, 200, 90, 0.9); }

.btn-ghost {
  color: var(--txt);
  border-color: var(--line-hi);
  background: rgba(255, 255, 255, 0.03);
}
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--green); background: rgba(70, 200, 90, 0.1); }

.link-arrow { color: var(--green-2); font-weight: 500; display: inline-flex; gap: 8px; }
.link-arrow:hover { color: #fff; }

/* -------------------------------------------------------------- 顶部栏 ---- */
.hd {
  position: sticky; top: 0; z-index: 60;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(6, 10, 17, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}
.hd.is-stuck { border-bottom-color: var(--line); background: rgba(6, 10, 17, 0.92); }

.hd-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; height: 74px; }

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 40px; height: 40px; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 18px; font-weight: 600; letter-spacing: 0.02em; }
.brand-sub { font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; color: var(--muted); text-transform: uppercase; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  position: relative; padding: 10px 15px; border-radius: 8px;
  font-size: 15px; color: var(--muted);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.nav-link:hover { color: var(--txt); background: var(--panel); }
.nav-link.is-active { color: var(--txt); }
.nav-link.is-active::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 4px;
  height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan));
}
.nav-service { margin-left: 10px; padding: 9px 18px; font-size: 14px; }

.nav-toggle {
  display: none; width: 42px; height: 42px; padding: 0;
  background: transparent; border: 1px solid var(--line); border-radius: 10px; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 18px; height: 2px; margin: 4px auto;
  background: var(--txt); border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------------------------------------------------------------- Hero ---- */
.hero { position: relative; padding: 96px 0 84px; overflow: hidden; }
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.55; }
.hero-glow {
  position: absolute; top: -220px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 620px; pointer-events: none;
  background: radial-gradient(closest-side, rgba(70, 200, 90, 0.22), transparent 72%);
  filter: blur(10px);
}
.hero-scan {
  position: absolute; left: 0; right: 0; height: 1px; pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(79, 209, 224, 0.55), transparent);
  animation: scan 7s linear infinite;
}
@keyframes scan {
  0% { top: 8%; opacity: 0; }
  12% { opacity: 1; }
  88% { opacity: 1; }
  100% { top: 92%; opacity: 0; }
}
.hero-inner { position: relative; max-width: 940px; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em;
  color: var(--muted);
  padding: 7px 15px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--panel);
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--green);
  box-shadow: 0 0 0 0 rgba(70, 200, 90, 0.6);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(70, 200, 90, 0.55); }
  70% { box-shadow: 0 0 0 11px rgba(70, 200, 90, 0); }
  100% { box-shadow: 0 0 0 0 rgba(70, 200, 90, 0); }
}

.hero-title {
  margin: 26px 0 20px;
  font-size: clamp(30px, 5.4vw, 58px);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.2;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(96deg, var(--green-2) 6%, var(--cyan) 52%, var(--orange) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-desc { max-width: 640px; font-size: 17px; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 30px 0 0; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px;
  margin: 54px 0 0; padding: 26px 0 0; border-top: 1px solid var(--line);
}
.hero-stats li { display: flex; flex-direction: column; }
.stat-num {
  font-family: var(--mono); font-size: clamp(26px, 3.4vw, 38px); font-weight: 600;
  color: #fff; letter-spacing: -0.02em;
}
.stat-suffix {
  font-family: var(--mono); font-size: 14px; color: var(--green-2); margin-bottom: 4px;
  min-height: 1.45em;  /* 空 suffix 也要占住这一行，否则同排其它卡片跟着错位 */
}
.stat-label { font-size: 13px; color: var(--muted); }

/* --------------------------------------------------------------- 区块通用 -- */
.sec { position: relative; padding: 92px 0; }
.sec-alt { background: linear-gradient(180deg, rgba(255, 255, 255, 0.018), transparent); }
.sec-head { max-width: 720px; margin-bottom: 48px; }
.sec-kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--green-2); margin-bottom: 14px;
}
.sec-title { font-size: clamp(24px, 3.2vw, 36px); }
.sec-desc { color: var(--muted); font-size: 16px; margin: 0; }
.sec-more { margin: 32px 0 0; }

/* ------------------------------------------------------------- 卡片网格 --- */
.cards { display: grid; gap: 20px; }
.cards-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.cards-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.cards-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  position: relative; padding: 26px 22px; border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease),
    background-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: linear-gradient(160deg, rgba(70, 200, 90, 0.16), transparent 46%);
  opacity: 0; transition: opacity 0.35s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--line-hi);
  background: var(--panel-hi);
  box-shadow: 0 22px 44px -26px rgba(0, 0, 0, 0.9);
}
.card:hover::before { opacity: 1; }
.card-line { padding: 24px 22px; }

.card-icon {
  width: 46px; height: 46px; margin-bottom: 16px; border-radius: 12px;
  display: grid; place-items: center; color: var(--green-2);
  background: linear-gradient(150deg, rgba(70, 200, 90, 0.18), rgba(79, 209, 224, 0.08));
  border: 1px solid var(--line);
}
.card-icon svg { width: 24px; height: 24px; }

.card-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 6px;
}
.card-title { font-size: 18px; margin-bottom: 10px; }
.card-desc { font-size: 14px; color: var(--muted); margin: 0; }
.card-points { margin: 14px 0 0; display: flex; flex-wrap: wrap; gap: 7px; }
.card-points li {
  font-size: 12px; color: var(--muted); padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.025);
}

.case { padding: 24px 22px; }
.case-year { font-family: var(--mono); font-size: 12px; color: var(--orange); margin: 0 0 10px; }
.case-scope { font-size: 12px; color: var(--cyan); margin: 0 0 10px; letter-spacing: 0.02em; }

/* -------------------------------------------------------------- 流程条 ----- */
.flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; position: relative; }
.flow::before {
  content: ""; position: absolute; top: 26px; left: 4%; right: 4%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-hi), transparent);
}
.flow-item { position: relative; padding: 0 4px; }
.flow-num {
  display: grid; place-items: center; width: 52px; height: 52px; border-radius: 50%;
  font-family: var(--mono); font-size: 15px; color: var(--green-2);
  background: #0a121c; border: 1px solid var(--line-hi); margin-bottom: 18px;
}
.flow-title { font-size: 17px; margin-bottom: 6px; }
.flow-desc { font-size: 14px; color: var(--muted); margin: 0; }

/* ------------------------------------------------------------ 资质缩略图 --- */
.cert-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.cert-thumb {
  display: block; border-radius: 12px; overflow: hidden;
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.9);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.cert-thumb:hover { transform: translateY(-5px); border-color: var(--green); }
.cert-thumb img { aspect-ratio: 4 / 3; object-fit: contain; width: 100%; background: #fff; }
.cert-cap {
  display: block; padding: 10px 12px; font-size: 13px; color: #0d2136;
  background: #fff; text-align: center;
}

/* ---------------------------------------------------------------- CTA ----- */
.cta { padding: 20px 0 96px; }
.cta-inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 26px;
  padding: 42px 44px; border-radius: 20px;
  background:
    radial-gradient(600px 240px at 88% 0%, rgba(70, 200, 90, 0.2), transparent 70%),
    linear-gradient(140deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--line-hi);
}
.cta-title { font-size: clamp(21px, 2.6vw, 28px); margin-bottom: 8px; }
.cta-desc { color: var(--muted); margin: 0; }
/* 文字块必须可收缩：否则文案一长，按 max-content 算行宽会把按钮挤到下一行 */
.cta-inner > div:first-child { flex: 1 1 320px; min-width: 0; }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; flex: 0 0 auto; }

/* ------------------------------------------------------------- 页面头 ----- */
.page-head { padding: 78px 0 30px; }
.page-title { font-size: clamp(28px, 4.4vw, 44px); margin: 6px 0 14px; }
.page-desc { color: var(--muted); font-size: 17px; max-width: 620px; }
.page-head.err { padding: 120px 0 90px; }

/* --------------------------------------------------------- 解决方案页 ----- */
.solutions { display: flex; flex-direction: column; gap: 18px; }
.sol {
  display: grid; grid-template-columns: 280px 1fr; gap: 30px;
  padding: 30px 32px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line);
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}
.sol:hover { border-color: var(--line-hi); background: var(--panel-hi); }
.sol-title { font-size: 22px; margin: 0; }
.sol-desc { color: var(--muted); }
.sol-points { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 14px; }
.sol-points li {
  font-size: 13px; padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--txt); background: rgba(255, 255, 255, 0.025);
}

/* ------------------------------------------------------------ 资质页 ------ */
.certs { display: flex; flex-direction: column; gap: 28px; margin-bottom: 28px; }
.cert {
  display: grid; grid-template-columns: minmax(260px, 400px) 1fr; gap: 30px;
  padding: 26px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line);
}
.cert-figure { position: relative; display: block; border-radius: 10px; overflow: hidden; background: #fff; }
.cert-figure img { width: 100%; max-height: 420px; object-fit: contain; background: #fff; }
.cert-zoom {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 8px 12px;
  font-size: 12px; color: #fff; text-align: center;
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.72));
  opacity: 0; transition: opacity 0.3s var(--ease);
}
.cert-figure:hover .cert-zoom { opacity: 1; }
.cert-name { font-size: 20px; margin-bottom: 8px; }
.cert-grade { display: inline-block; font-size: 13px; color: var(--green-2); margin: 0 0 14px; }
.cert-desc { color: var(--muted); font-size: 14px; }
.cert-meta { display: grid; grid-template-columns: 110px 1fr; gap: 6px 16px; margin-top: 18px; font-size: 13px; }
.cert-meta dt { color: var(--muted); }
.cert-meta dd { color: var(--txt); word-break: break-all; }

/* ------------------------------------------------------------ 关于页 ------ */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 44px; align-items: center; }
.about-text p { color: var(--muted); }
.about-text .sec-title { margin-bottom: 20px; }
.about-figure {
  margin: 0; padding: 34px; border-radius: var(--radius); text-align: center;
  background: var(--panel); border: 1px solid var(--line);
}
.about-figure img { width: 100%; max-width: 300px; margin: 0 auto; }
.about-figure figcaption {
  margin-top: 18px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  color: var(--muted); text-transform: uppercase;
}

.stats-row {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px;
}
.stats-row li {
  padding: 24px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line);
  display: flex; flex-direction: column;
}

.timeline { position: relative; padding-left: 26px; }
.timeline::before {
  content: ""; position: absolute; left: 5px; top: 8px; bottom: 8px; width: 1px;
  background: linear-gradient(180deg, var(--green), rgba(79, 209, 224, 0.35), transparent);
}
.tl-item { position: relative; padding: 0 0 30px 22px; }
.tl-item::before {
  content: ""; position: absolute; left: -26px; top: 8px; width: 11px; height: 11px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--green);
  box-shadow: 0 0 0 4px rgba(70, 200, 90, 0.12);
}
.tl-year { font-family: var(--mono); font-size: 13px; color: var(--green-2); letter-spacing: 0.08em; }
.tl-title { font-size: 17px; margin: 4px 0 6px; }
.tl-desc { color: var(--muted); font-size: 14px; margin: 0; }

/* ------------------------------------------------------------ 联系页 ------ */
.contact-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; }
.contact-card {
  padding: 34px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line);
}
.contact-title { font-size: 20px; margin-bottom: 20px; }
.contact-list { display: grid; grid-template-columns: 88px 1fr; gap: 12px 18px; font-size: 15px; }
.contact-list dt { color: var(--muted); }
.contact-list dd { color: var(--txt); }
.contact-strong { font-family: var(--mono); font-size: 20px; color: var(--green-2); }
.contact-hint { margin-left: 10px; font-size: 12px; color: var(--muted); }
.contact-desc { color: var(--muted); }
.contact-note { margin: 16px 0 0; font-size: 13px; color: var(--muted); }

.map {
  border-radius: var(--radius); border: 1px dashed var(--line-hi);
  background: linear-gradient(140deg, rgba(79, 209, 224, 0.06), transparent);
  min-height: 190px; display: grid; place-items: center;
}
.map-link { display: flex; align-items: center; gap: 14px; padding: 28px; font-size: 16px; }
.map-link:hover .map-text { color: var(--green-2); }
.map-pin {
  position: relative; width: 16px; height: 16px; border-radius: 50% 50% 50% 0;
  background: var(--green); transform: rotate(-45deg);
  box-shadow: 0 0 0 6px rgba(70, 200, 90, 0.14);
}

/* -------------------------------------------------------------- 页脚 ------ */
.ft { border-top: 1px solid var(--line); background: rgba(4, 7, 12, 0.72); padding: 58px 0 26px; }
.ft-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.4fr 1.4fr; gap: 34px; }
.ft-logo { width: 172px; margin-bottom: 16px; }
.ft-slogan { font-size: 13px; color: var(--muted); }
.ft-col h3 {
  font-size: 13px; font-family: var(--mono); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 14px;
}
.ft-col li { font-size: 13.5px; color: var(--txt); margin-bottom: 9px; line-height: 1.6; }
.ft-col a:hover { color: var(--green-2); }
.ft-k { display: block; font-size: 11.5px; color: var(--muted); }
.ft-bottom {
  display: flex; flex-wrap: wrap; gap: 10px 22px; justify-content: space-between;
  margin-top: 44px; padding-top: 20px; border-top: 1px solid var(--line);
  font-size: 12.5px; color: var(--muted);
}
.ft-bottom p { margin: 0; }
.ft-legal { display: flex; gap: 18px; flex-wrap: wrap; }
.ft-legal a:hover { color: var(--green-2); }

/* ------------------------------------------------------------ 法律页 ------- */
.legal-updated { color: var(--muted); font-size: 13px; margin: 10px 0 0; }
.legal-body { max-width: 780px; }
.legal-item { padding: 22px 0; border-top: 1px solid var(--line); }
.legal-item:first-child { border-top: none; padding-top: 0; }
.legal-h { font-size: 18px; margin: 0 0 10px; }
.legal-body p { color: var(--txt); font-size: 15px; line-height: 1.85; margin: 0 0 10px; }
.legal-list { margin: 0 0 10px; padding-left: 20px; }
.legal-list li { color: var(--txt); font-size: 15px; line-height: 1.85; margin-bottom: 8px; }
.legal-foot { color: var(--muted); font-size: 14px; }

/* ------------------------------------------------------------ 灯箱 ------- */
.lightbox {
  position: fixed; inset: 0; z-index: 120; display: grid; place-items: center;
  padding: 40px 24px; background: rgba(3, 6, 11, 0.92);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.lightbox[hidden] { display: none; }
.lightbox img { max-width: min(100%, 1000px); max-height: 84vh; border-radius: 10px; background: #fff; }
.lightbox-close {
  position: absolute; top: 22px; right: 26px; width: 44px; height: 44px;
  font-size: 26px; line-height: 1; color: var(--txt); cursor: pointer;
  background: rgba(255, 255, 255, 0.06); border: 1px solid var(--line); border-radius: 50%;
}
.lightbox-close:hover { border-color: var(--green); color: var(--green-2); }

/* -------------------------------------------------------- 滚动进场 ------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.card.reveal, .flow-item.reveal, .cert-thumb.reveal, .tl-item.reveal, .stats-row li.reveal {
  transition-delay: calc(var(--i, 0) * 70ms);
}

/* -------------------------------------------------------------- 响应式 --- */
@media (max-width: 1080px) {
  .cards-5 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .cards-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cert-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ft-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 74px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    padding: 14px 22px 20px;
    background: rgba(6, 10, 17, 0.98);
    border-bottom: 1px solid var(--line);
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }
  .nav.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-link { padding: 13px 12px; }
  .nav-link.is-active::after { display: none; }
  .nav-service { margin: 10px 0 0; justify-content: center; }

  .hero { padding: 66px 0 60px; }
  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
  .sec { padding: 68px 0; }
  .cards-5, .cards-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .flow::before { display: none; }
  .sol { grid-template-columns: 1fr; gap: 14px; padding: 24px; }
  .cert { grid-template-columns: 1fr; }
  .contact-grid, .about-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cta-inner { padding: 32px 26px; }
}

@media (max-width: 560px) {
  .wrap { width: calc(100% - 34px); }
  .cards-5, .cards-4, .cards-3, .flow { grid-template-columns: 1fr; }
  .cert-strip { grid-template-columns: 1fr; }
  .ft-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr; }
  .contact-list { grid-template-columns: 1fr; }
  .contact-list dt { margin-top: 8px; }
  .brand-sub { display: none; }
  .cert-meta { grid-template-columns: 1fr; }
  .cert-meta dt { margin-top: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .hero-canvas { display: none; }
}

@media print {
  .hd, .ft, .hero-canvas, .hero-glow, .hero-scan, .cta { display: none; }
  body { background: #fff; color: #000; }
}