/* =========================================================
   神州天算 SUANTEC · AI 全栈算力产业链官网
   主色 #019fe1 ｜ 辅色 青 #22d3ee / 金 #f0b429
   ========================================================= */
:root {
  --bg: #04070e;
  --bg-2: #070e1a;
  --bg-3: #0b1628;
  --panel: rgba(255, 255, 255, 0.042);
  --panel-2: rgba(255, 255, 255, 0.07);
  --panel-border: rgba(255, 255, 255, 0.09);
  --line: rgba(255, 255, 255, 0.08);
  --text: #e8f1fb;
  --muted: #93a7c4;
  --faint: #5d708e;
  --brand: #019fe1;
  --brand-soft: rgba(1, 159, 225, 0.16);
  --cyan: #22d3ee;
  --gold: #f0b429;
  --grad: linear-gradient(96deg, #22d3ee 0%, #019fe1 52%, #f0b429 108%);
  --grad-soft: linear-gradient(120deg, rgba(34, 211, 238, .16), rgba(1, 159, 225, .14), rgba(240, 180, 41, .12));
  --radius: 18px;
  --radius-sm: 12px;
  --header-h: 74px;
  --shadow: 0 22px 60px -28px rgba(0, 0, 0, .85);
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC",
          -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 18px);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overflow-wrap: break-word;
}

/* 全局星野 / 光晕背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(1, 159, 225, .20), transparent 62%),
    radial-gradient(820px 520px at 8% 6%, rgba(34, 211, 238, .12), transparent 60%),
    radial-gradient(760px 620px at 92% 96%, rgba(240, 180, 41, .09), transparent 62%),
    var(--bg);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, .022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .022) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 78%);
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 78%);
}

::selection { background: rgba(1, 159, 225, .42); color: #fff; }

a { color: inherit; text-decoration: none; }
button, input, select, textarea { font-family: inherit; font-size: 100%; }
img, svg, canvas { display: block; max-width: 100%; }
ul { list-style: none; }

.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.container--narrow { width: min(940px, calc(100% - 48px)); margin: 0 auto; }

/* ---------- 通用文字工具 ---------- */
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.grad-text { color: #6fd8f5; }
.mono { font-family: var(--mono); }

.eyebrow {
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
  font-weight: 700;
  margin-bottom: 14px;
}
.eyebrow--gold { color: var(--gold); }

.section { padding: 110px 0; position: relative; }
.section--tight { padding: 78px 0; }
.section--alt { background: linear-gradient(180deg, transparent, rgba(255, 255, 255, .022) 22%, rgba(255, 255, 255, .022) 78%, transparent); }
.section-head { max-width: 780px; margin-bottom: 58px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section-title {
  font-size: clamp(28px, 3.9vw, 44px);
  font-weight: 800;
  letter-spacing: .005em;
  line-height: 1.24;
}
.section-desc { color: var(--muted); margin-top: 18px; font-size: 16.5px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease, color .25s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--grad);
  color: #031522;
  box-shadow: 0 14px 34px -14px rgba(1, 159, 225, .75);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 20px 42px -14px rgba(34, 211, 238, .8); }
.btn--ghost {
  border-color: rgba(255, 255, 255, .18);
  color: var(--text);
  background: rgba(255, 255, 255, .03);
}
.btn--ghost:hover { border-color: var(--cyan); color: #fff; background: rgba(34, 211, 238, .1); transform: translateY(-2px); }
.btn--sm { padding: 9px 18px; font-size: 14px; }
.btn__arrow { transition: transform .2s ease; }
.btn:hover .btn__arrow { transform: translateX(3px); }

/* ---------- 顶部滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px; width: 0;
  background: var(--grad);
  z-index: 200;
  transition: width .1s linear;
}

/* ---------- 顶栏 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 120;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background .3s ease, box-shadow .3s ease, border-color .3s ease, backdrop-filter .3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.is-stuck {
  background: rgba(4, 8, 15, .82);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  backdrop-filter: saturate(160%) blur(16px);
  border-bottom-color: var(--line);
  box-shadow: 0 16px 40px -30px #000;
}
.header-inner { display: flex; align-items: center; gap: 28px; width: 100%; }

.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand__mark { width: 40px; height: 40px; flex-shrink: 0; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .1em;
  background: linear-gradient(96deg, #ffffff, #bfe9ff 60%, #f0b429);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand__en {
  font-size: 9.5px;
  letter-spacing: .32em;
  color: var(--faint);
  font-weight: 600;
}

.site-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.site-nav a {
  padding: 9px 14px;
  border-radius: 10px;
  font-size: 14.5px;
  color: var(--muted);
  transition: color .2s ease, background .2s ease;
}
.site-nav a:hover, .site-nav a.is-active { color: #fff; background: rgba(255, 255, 255, .055); }
.site-nav .nav-cta {
  margin-left: 12px;
  background: var(--grad);
  color: #031522;
  font-weight: 700;
  padding: 10px 20px;
  box-shadow: 0 12px 28px -14px rgba(1, 159, 225, .8);
}
.site-nav .nav-cta:hover { color: #031522; background: var(--grad); filter: brightness(1.08); }

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px; height: 44px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--text); 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); }

/* ---------- HERO ---------- */
.hero { padding: calc(var(--header-h) + 74px) 0 96px; position: relative; overflow: hidden; }
.hero-inner {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 56px;
  align-items: center;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 12px;
  border-radius: 999px;
  border: 1px solid rgba(1, 159, 225, .34);
  background: var(--brand-soft);
  font-size: 13px;
  color: #9fe0ff;
  margin-bottom: 22px;
}
.hero__badge b { color: #fff; font-weight: 700; }
.hero__title {
  font-size: clamp(34px, 5.4vw, 62px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.01em;
}
.hero__slogan {
  margin-top: 22px;
  font-size: clamp(17px, 2.3vw, 23px);
  font-weight: 800;
  letter-spacing: .04em;
  color: #ffd980;
  display: flex;
  align-items: center;
  gap: 12px;
}
.hero__slogan::before {
  content: "";
  width: 30px; height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
  border-radius: 2px;
}
.hero__sub { color: var(--muted); font-size: 17px; margin-top: 20px; max-width: 620px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 46px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}
.stat__num {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}
.stat__unit { font-size: 13px; color: var(--cyan); font-weight: 700; margin-left: 3px; }
.stat p { font-size: 12.5px; color: var(--faint); margin-top: 4px; line-height: 1.5; }

.hero__visual { position: relative; }
.hero__visual::before {
  content: "";
  position: absolute;
  inset: -12%;
  background: radial-gradient(circle at 50% 50%, rgba(1, 159, 225, .22), transparent 66%);
  filter: blur(6px);
}
#coreCanvas { position: relative; width: 100%; aspect-ratio: 1 / 1; max-width: 520px; margin: 0 auto; }
.hero__visual-caption {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 6px;
}
.pulse-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(34, 211, 238, .6);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34, 211, 238, .55); }
  70% { box-shadow: 0 0 0 11px rgba(34, 211, 238, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0); }
}

/* ---------- 客户 / 信任条 ---------- */
.trustbar { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .015); }
.trustbar-inner { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; padding: 20px 0; }
.trustbar__label { font-size: 13px; color: var(--faint); letter-spacing: .12em; }
.trustbar__items { display: flex; flex-wrap: wrap; gap: 10px; }
.trustbar__items span {
  font-size: 13px;
  color: var(--muted);
  padding: 6px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: var(--panel);
}

/* ---------- 全栈分层图 ---------- */
.stack { display: flex; flex-direction: column; gap: 12px; }
.stack__row {
  display: grid;
  grid-template-columns: 210px 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-border);
  background: linear-gradient(96deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .018));
  transition: transform .22s ease, border-color .22s ease, background .22s ease;
  position: relative;
  overflow: hidden;
}
.stack__row::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--grad);
  opacity: .85;
}
.stack__row:hover { transform: translateX(5px); border-color: rgba(1, 159, 225, .48); background: linear-gradient(96deg, rgba(1, 159, 225, .13), rgba(255, 255, 255, .02)); }
.stack__k { display: flex; align-items: center; gap: 12px; }
.stack__idx { font-family: var(--mono); font-size: 12px; color: var(--gold); letter-spacing: .1em; }
.stack__name { font-size: 17px; font-weight: 700; }
.stack__desc { font-size: 14px; color: var(--muted); }
.stack__go { font-size: 13px; color: var(--cyan); white-space: nowrap; opacity: .85; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 22px; }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  position: relative;
  padding: 28px 26px 26px;
  border-radius: var(--radius);
  border: 1px solid var(--panel-border);
  background: linear-gradient(180deg, rgba(255, 255, 255, .055), rgba(255, 255, 255, .015));
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
  overflow: hidden;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(420px 200px at 100% 0%, rgba(1, 159, 225, .16), transparent 70%);
  opacity: 0;
  transition: opacity .25s ease;
  pointer-events: none;
}
.card:hover { transform: translateY(-6px); border-color: rgba(34, 211, 238, .42); box-shadow: var(--shadow); }
.card:hover::after { opacity: 1; }
.card__icon { width: 46px; height: 46px; color: var(--cyan); margin-bottom: 18px; }
.card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--muted); }
.card__tag {
  display: inline-block;
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: .06em;
  color: #8fd8f2;
  border: 1px solid rgba(34, 211, 238, .28);
  background: rgba(34, 211, 238, .09);
  padding: 4px 11px;
  border-radius: 999px;
}
.card__list { margin-top: 14px; display: flex; flex-direction: column; gap: 7px; }
.card__list li { font-size: 13.5px; color: var(--muted); padding-left: 16px; position: relative; }
.card__list li::before { content: ""; position: absolute; left: 0; top: 9px; width: 5px; height: 5px; border-radius: 50%; background: var(--brand); }

/* 产品线卡片（首页 7 条线） */
.line-card { display: flex; flex-direction: column; min-height: 100%; }
.line-card__no { font-family: var(--mono); font-size: 12px; color: var(--gold); letter-spacing: .14em; margin-bottom: 12px; }
.line-card__more { margin-top: auto; padding-top: 20px; font-size: 13.5px; font-weight: 600; color: var(--cyan); display: flex; align-items: center; gap: 7px; }
.line-card:hover .line-card__more { gap: 11px; }
.line-card__more span { transition: transform .2s ease; }

/* ---------- 数据 / 规格表 ---------- */
.spec-table { width: 100%; border-collapse: collapse; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--panel-border); }
.spec-table caption { text-align: left; font-size: 13px; color: var(--faint); padding-bottom: 10px; }
.spec-table th, .spec-table td { padding: 13px 18px; font-size: 14.5px; text-align: left; }
/* 表头按品牌规范：#30A8E4 + 白字 */
.spec-table thead th {
  background: #30A8E4;
  color: #ffffff;
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: .04em;
  border-bottom: 0;
}
.spec-table tbody tr:nth-child(odd) { background: rgba(255, 255, 255, .045); }
.spec-table tbody tr:nth-child(even) { background: rgba(255, 255, 255, .012); }
.spec-table tbody tr:hover { background: rgba(48, 168, 228, .12); }
.spec-table tbody td:first-child { color: #dbeaf7; font-weight: 600; }
.spec-table tbody td { color: var(--muted); }

/* ---------- 优势列表 ---------- */
.advantage-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 30px; }
.advantage-item { display: flex; gap: 16px; padding: 20px 22px; border-radius: var(--radius-sm); border: 1px solid var(--panel-border); background: var(--panel); transition: border-color .22s ease, transform .22s ease; }
.advantage-item:hover { border-color: rgba(240, 180, 41, .4); transform: translateY(-3px); }
.advantage-item__icon {
  flex-shrink: 0;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 11px;
  background: var(--grad-soft);
  border: 1px solid rgba(1, 159, 225, .26);
  color: var(--cyan);
  font-size: 17px;
  font-weight: 700;
}
.advantage-item h3 { font-size: 16.5px; margin-bottom: 6px; }
.advantage-item p { font-size: 14px; color: var(--muted); }

/* ---------- 价值观 / 数字小节 ---------- */
.value {
  padding: 24px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-border);
  background: var(--panel);
  transition: border-color .22s ease, transform .22s ease;
}
.value:hover { border-color: rgba(1, 159, 225, .42); transform: translateY(-4px); }
.value span { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; color: var(--gold); }
.value h4 { font-size: 16.5px; margin: 10px 0 8px; }
.value p { font-size: 14px; color: var(--muted); }

/* ---------- 时间线 ---------- */
.timeline { position: relative; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 1px; background: linear-gradient(180deg, var(--cyan), var(--brand), var(--gold)); opacity: .5; }
.timeline__item { position: relative; padding-bottom: 26px; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -30px; top: 6px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, .16);
}
.timeline__year { font-family: var(--mono); font-size: 13px; color: var(--gold); letter-spacing: .1em; }
.timeline__card { margin-top: 8px; padding: 18px 22px; border-radius: var(--radius-sm); border: 1px solid var(--panel-border); background: var(--panel); }
.timeline__card h4 { font-size: 16px; margin-bottom: 6px; }
.timeline__card p { font-size: 14px; color: var(--muted); }

/* ---------- 服务流程 ---------- */
.process { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.process__step { padding: 24px 22px; border-radius: var(--radius-sm); border: 1px solid var(--panel-border); background: var(--panel); position: relative; }
.process__num { font-family: var(--mono); font-size: 12px; color: var(--gold); letter-spacing: .14em; }
.process__step h4 { font-size: 16.5px; margin: 10px 0 8px; }
.process__step p { font-size: 13.8px; color: var(--muted); }

/* ---------- CTA 条 ---------- */
.cta-band {
  border-radius: 22px;
  border: 1px solid rgba(1, 159, 225, .3);
  background: linear-gradient(120deg, rgba(1, 159, 225, .18), rgba(34, 211, 238, .07) 45%, rgba(240, 180, 41, .1));
  padding: 46px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}
.cta-band h3 { font-size: clamp(22px, 2.7vw, 30px); font-weight: 800; margin-bottom: 10px; }
.cta-band p { color: #b9cfe4; font-size: 15.5px; max-width: 620px; }
.cta-band__actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 联系 / 表单 ---------- */
.contact-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 40px; align-items: start; }
.contact-form { padding: 32px; border-radius: var(--radius); border: 1px solid var(--panel-border); background: linear-gradient(180deg, rgba(255, 255, 255, .055), rgba(255, 255, 255, .015)); }
.form-row { margin-bottom: 16px; }
.form-row label { display: block; font-size: 13.5px; color: #b7cade; margin-bottom: 7px; font-weight: 600; }
.form-row input, .form-row select, .form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 11px;
  border: 1px solid var(--panel-border);
  background: rgba(4, 8, 15, .6);
  color: var(--text);
  font-size: 14.5px;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.form-row input::placeholder, .form-row textarea::placeholder { color: #55688a; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(1, 159, 225, .16);
}
.form-row select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, #7f96b5 50%), linear-gradient(135deg, #7f96b5 50%, transparent 50%); background-position: calc(100% - 20px) 50%, calc(100% - 15px) 50%; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-submit { width: 100%; justify-content: center; margin-top: 8px; }
.form-note { font-size: 12.5px; color: var(--faint); margin-top: 12px; text-align: center; }

.contact-side { display: flex; flex-direction: column; gap: 16px; }
.contact-item { display: flex; gap: 15px; padding: 20px 22px; border-radius: var(--radius-sm); border: 1px solid var(--panel-border); background: var(--panel); }
.contact-item__icon { flex-shrink: 0; width: 40px; height: 40px; display: grid; place-items: center; border-radius: 11px; background: var(--grad-soft); border: 1px solid rgba(1, 159, 225, .26); color: var(--cyan); font-size: 16px; }
.contact-item h4 { font-size: 15.5px; margin-bottom: 5px; }
.contact-item p { font-size: 14px; color: var(--muted); }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); background: linear-gradient(180deg, transparent, rgba(0, 0, 0, .45)); padding: 64px 0 34px; margin-top: 40px; }
.footer-inner { display: grid; grid-template-columns: 1.35fr 1fr 1fr; gap: 42px; }
.footer-brand { display: flex; gap: 14px; align-items: flex-start; }
.footer-brand svg { width: 44px; height: 44px; flex-shrink: 0; }
.footer-brand__name { font-size: 19px; font-weight: 800; letter-spacing: .1em; }
.footer-brand__en { font-size: 10px; letter-spacing: .3em; color: var(--faint); margin-top: 3px; }
.footer-brand__slogan { font-size: 14px; color: var(--gold); margin-top: 12px; font-weight: 700; letter-spacing: .03em; }
.footer-brand__desc { font-size: 13.5px; color: var(--faint); margin-top: 12px; max-width: 360px; line-height: 1.7; }
.footer-col h4 { font-size: 14px; letter-spacing: .1em; color: #c6d8ea; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: var(--muted); padding: 6px 0; transition: color .2s ease, transform .2s ease; }
.footer-col a:hover { color: var(--cyan); transform: translateX(3px); }
.footer-bottom {
  margin-top: 46px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-bottom p { font-size: 13px; color: var(--faint); }
.footer-beian { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.footer-beian a { font-size: 13px; color: var(--muted); transition: color .2s ease; display: inline-flex; align-items: center; gap: 6px; }
.footer-beian a:hover { color: var(--cyan); }
.footer-beian .ico { font-size: 14px; opacity: .8; }

/* ---------- 轻提示 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translate(-50%, 26px);
  background: rgba(9, 22, 37, .96);
  border: 1px solid rgba(1, 159, 225, .45);
  color: #dfefff;
  padding: 14px 24px;
  border-radius: 999px;
  font-size: 14.5px;
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity .28s ease, transform .28s ease;
  box-shadow: 0 20px 50px -20px #000;
  max-width: calc(100% - 40px);
  text-align: center;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 46px; height: 46px;
  border-radius: 14px;
  border: 1px solid var(--panel-border);
  background: rgba(9, 22, 37, .9);
  color: var(--cyan);
  display: grid;
  place-items: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease, border-color .2s ease;
  z-index: 110;
}
.to-top.is-on { opacity: 1; pointer-events: auto; }
.to-top:hover { border-color: var(--cyan); transform: translateY(-3px); }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s cubic-bezier(.2, .7, .3, 1), transform .7s cubic-bezier(.2, .7, .3, 1); }
.reveal.is-in { opacity: 1; transform: none; }

/* =========================================================
   子页
   ========================================================= */
.page-hero { padding: calc(var(--header-h) + 62px) 0 62px; position: relative; border-bottom: 1px solid var(--line); }
.crumb { display: flex; align-items: center; gap: 9px; font-size: 13px; color: var(--faint); margin-bottom: 22px; flex-wrap: wrap; }
.crumb a { color: var(--muted); transition: color .2s ease; }
.crumb a:hover { color: var(--cyan); }
.crumb span.sep { opacity: .5; }
.page-hero__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 46px; align-items: center; }
.page-hero h1 { font-size: clamp(30px, 4.2vw, 48px); font-weight: 900; line-height: 1.18; }
.page-hero__sub { color: var(--muted); font-size: 16.5px; margin-top: 18px; max-width: 640px; }
.page-hero__actions { display: flex; gap: 13px; margin-top: 30px; flex-wrap: wrap; }
.page-hero__badge {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 12.5px; color: #9fe0ff;
  border: 1px solid rgba(1, 159, 225, .32);
  background: var(--brand-soft);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 18px;
}
.page-hero__panel {
  border-radius: var(--radius);
  border: 1px solid var(--panel-border);
  background: linear-gradient(180deg, rgba(255, 255, 255, .06), rgba(255, 255, 255, .015));
  padding: 26px;
}
.page-hero__panel h4 { font-size: 13px; letter-spacing: .14em; color: var(--cyan); margin-bottom: 16px; }
.kv { display: flex; flex-direction: column; gap: 13px; }
.kv__row { display: flex; justify-content: space-between; gap: 16px; font-size: 14px; padding-bottom: 12px; border-bottom: 1px dashed rgba(255, 255, 255, .08); }
.kv__row:last-child { border-bottom: 0; padding-bottom: 0; }
.kv__k { color: var(--faint); flex-shrink: 0; }
.kv__v { color: #d6e6f5; text-align: right; font-weight: 600; }

.cross-links .grid { gap: 14px; }
.cross-link {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-border);
  background: var(--panel);
  font-size: 15px;
  transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.cross-link:hover { border-color: rgba(1, 159, 225, .45); transform: translateY(-3px); background: rgba(1, 159, 225, .08); }
.cross-link span.ar { color: var(--cyan); font-size: 13px; }

.bullets { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 26px; margin-top: 26px; }
.bullets li { position: relative; padding-left: 26px; font-size: 14.8px; color: #c3d5e7; }
.bullets li::before {
  content: "✓";
  position: absolute; left: 0; top: 0;
  width: 17px; height: 17px;
  display: grid; place-items: center;
  font-size: 10.5px;
  color: #031522;
  background: var(--grad);
  border-radius: 50%;
  font-weight: 700;
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero__visual { order: -1; }
  #coreCanvas { max-width: 400px; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-grid { grid-template-columns: 1fr; }
  .page-hero__grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 18px 24px 26px;
    background: rgba(4, 8, 15, .97);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-14px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s ease, transform .25s ease;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .site-nav.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .site-nav a { padding: 13px 14px; font-size: 15.5px; border-bottom: 1px solid rgba(255, 255, 255, .05); }
  .site-nav .nav-cta { margin: 12px 0 0; text-align: center; justify-content: center; border-bottom: 0; }
  .nav-toggle { display: flex; }

  .section { padding: 76px 0; }
  .stack__row { grid-template-columns: 1fr; gap: 8px; }
  .stack__go { display: none; }
  .grid--3, .grid--2, .grid--4 { grid-template-columns: 1fr; }
  .advantage-list { grid-template-columns: 1fr; }
  .process { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero__stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 16px; }
  .bullets { grid-template-columns: 1fr; }
  .cta-band { padding: 34px 26px; }
  .form-grid-2 { grid-template-columns: 1fr; }
  .container, .container--narrow { width: calc(100% - 36px); }
  .footer-inner { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 520px) {
  .hero { padding-top: calc(var(--header-h) + 46px); }
  .process { grid-template-columns: 1fr; }
  .brand__name { font-size: 17px; }
  .spec-table th, .spec-table td { padding: 10px 12px; font-size: 13.5px; }
  .spec-table { display: block; overflow-x: auto; white-space: nowrap; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}