/* ═══════════════════════════════════════════════════════════
   牧言 Muyan · muyan.io
   工业 HMI 深色美学：石墨蓝黑底 · 琥珀警示色 · 青色数据色
   ═══════════════════════════════════════════════════════════ */

:root {
  --bg:        #0b0e13;
  --bg-2:      #0f141c;
  --bg-3:      #141b25;
  --bg-4:      #1a2330;
  --line:      #233040;
  --line-soft: #1a2431;
  --text:      #e8edf3;
  --muted:     #8d9aa8;
  --faint:     #5c6a7a;
  --amber:     #ffb020;
  --amber-dim: rgba(255, 176, 32, .14);
  --cyan:      #4dd0e1;
  --green:     #34d399;
  --red:       #f87171;
  --font-sans: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-serif:'Noto Serif SC', 'Songti SC', Georgia, serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', Menlo, Consolas, monospace;
  --maxw: 1180px;
  --radius: 10px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, svg { display: block; }
.mono { font-family: var(--font-mono); }

/* ── 背景氛围层 ─────────────────────────────────────────── */
.bg-grid {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    linear-gradient(var(--line-soft) 1px, transparent 1px) 0 0 / 100% 72px,
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px) 0 0 / 72px 100%;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
}

.bg-noise {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E");
}

/* ── 通用布局 ───────────────────────────────────────────── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

section { position: relative; padding: 110px 0; scroll-margin-top: 76px; }
[id] { scroll-margin-top: 76px; }

.sec-head { margin-bottom: 56px; max-width: 720px; }

.sec-kicker {
  font-family: var(--font-mono);
  font-size: 12px; letter-spacing: .18em;
  color: var(--amber);
  text-transform: uppercase;
  display: block; margin-bottom: 14px;
}

.sec-kicker::before { content: '▸ '; color: var(--faint); }

.sec-title {
  font-family: var(--font-serif);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700; line-height: 1.25;
  letter-spacing: .01em;
}

.sec-desc { color: var(--muted); font-size: 16px; margin-top: 16px; max-width: 640px; }

/* ── 按钮 ───────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 6px;
  font-size: 14px; font-weight: 600;
  border: 1px solid var(--line);
  transition: all .18s ease; white-space: nowrap;
}

.btn-lg { padding: 13px 28px; font-size: 15px; }

.btn-primary {
  background: var(--amber); color: #17130a; border-color: var(--amber);
}
.btn-primary:hover { background: #ffc14d; border-color: #ffc14d; box-shadow: 0 0 24px rgba(255, 176, 32, .35); }

.btn-ghost { background: transparent; color: var(--text); }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); }

/* ── 顶部导航 ───────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 14, 19, .82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}

.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 28px;
  height: 64px; display: flex; align-items: center; gap: 32px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { color: var(--amber); transition: transform .25s ease; }
.brand:hover .brand-mark { transform: rotate(-90deg); }
.brand-name { font-weight: 700; font-size: 19px; letter-spacing: .06em; }
.brand-sub {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .3em;
  color: var(--faint); margin-left: 8px;
}

.nav-links { display: flex; gap: 26px; margin-left: 12px; }
.nav-links a {
  font-size: 14px; color: var(--muted); position: relative; padding: 4px 0;
  transition: color .15s;
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--amber); transition: width .2s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.nav-actions { margin-left: auto; display: flex; gap: 12px; }
.nav-actions .btn { padding: 8px 16px; font-size: 13px; }

/* ── HERO ───────────────────────────────────────────────── */
.hero { padding: 84px 0 0; min-height: 92vh; display: flex; flex-direction: column; }

.hero-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 28px;
  display: grid; grid-template-columns: 1.15fr .85fr;
  gap: 64px; align-items: center; flex: 1;
}

.hero-copy { padding: 40px 0; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .22em;
  color: var(--muted); margin-bottom: 26px;
}

.dot-pulse {
  width: 8px; height: 8px; border-radius: 50%; background: var(--green);
  box-shadow: 0 0 0 0 rgba(52, 211, 153, .5);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(52, 211, 153, .45); }
  70%  { box-shadow: 0 0 0 9px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(38px, 5.2vw, 60px);
  font-weight: 900; line-height: 1.2; letter-spacing: .01em;
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(100deg, var(--amber) 20%, #ffd27a 60%, var(--amber) 90%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc { color: var(--muted); font-size: 16.5px; margin-top: 26px; max-width: 540px; }
.hero-desc strong { color: var(--text); font-weight: 600; }

.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }

.hero-tags {
  display: flex; gap: 22px; flex-wrap: wrap; margin-top: 28px;
  font-size: 13px; color: var(--muted);
}
.hero-tags li::before { content: '✓'; color: var(--green); margin-right: 7px; font-weight: 700; }

.hero-install { margin-top: 22px; }
.hero-install code {
  font-family: var(--font-mono); font-size: 12.5px;
  background: var(--bg-3); border: 1px solid var(--line);
  border-radius: 6px; padding: 7px 12px; color: var(--cyan);
  display: inline-block;
}
.hero-install .mono { color: var(--amber); }

/* ── HMI 面板 ───────────────────────────────────────────── */
.hmi {
  background: linear-gradient(180deg, var(--bg-3), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow:
    0 0 0 1px rgba(0,0,0,.4), 0 24px 60px -20px rgba(0,0,0,.6),
    inset 0 1px 0 rgba(255,255,255,.03);
  position: relative;
}

.hmi::before {
  content: ''; position: absolute; inset: 0; border-radius: var(--radius);
  pointer-events: none;
  background: linear-gradient(160deg, rgba(77,208,225,.06), transparent 40%);
}

.hmi-head {
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 14px; border-bottom: 1px solid var(--line-soft);
}
.hmi-title { font-size: 13px; font-weight: 700; letter-spacing: .04em; }
.hmi-tag {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .2em;
  color: var(--green); border: 1px solid rgba(52,211,153,.4);
  padding: 2px 8px; border-radius: 3px; margin-left: 8px;
  animation: liveblink 2s infinite;
}
@keyframes liveblink { 50% { opacity: .45; } }
.hmi-clock { font-family: var(--font-mono); font-size: 12px; color: var(--faint); }

.hmi-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 16px 0; }

.hmi-stat {
  background: var(--bg-2); border: 1px solid var(--line-soft);
  border-radius: 8px; padding: 12px 14px;
}
.hmi-stat-label { font-size: 11px; color: var(--faint); letter-spacing: .08em; }
.hmi-stat-value {
  font-family: var(--font-mono); font-size: 24px; font-weight: 600;
  color: var(--amber); margin: 4px 0 8px;
}

.mini-bars { display: flex; gap: 4px; align-items: flex-end; height: 18px; }
.mini-bars i {
  flex: 1; background: linear-gradient(180deg, rgba(77,208,225,.7), rgba(77,208,225,.25));
  border-radius: 1px; min-height: 2px;
}

.hmi-equip { border-top: 1px solid var(--line-soft); padding-top: 14px; }
.hmi-equip-head {
  display: flex; justify-content: space-between;
  font-size: 11px; color: var(--faint); letter-spacing: .06em; margin-bottom: 10px;
}
.hmi-list li {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12.5px; padding: 6px 2px; color: var(--muted);
  border-bottom: 1px dashed var(--line-soft);
}
.hmi-list li:last-child { border-bottom: none; }
.hmi-list .val { font-family: var(--font-mono); color: var(--text); font-size: 12px; }
.led { width: 7px; height: 7px; border-radius: 50%; display: inline-block; margin-right: 9px; }
li.on .led { background: var(--green); box-shadow: 0 0 6px rgba(52,211,153,.8); }
li.warn .led { background: var(--amber); box-shadow: 0 0 6px rgba(255,176,32,.8); animation: liveblink 1s infinite; }

.hmi-curve { margin-top: 12px; width: 100%; height: 64px; }
.hmi-curve .gridh { stroke: var(--line-soft); stroke-width: 1; fill: none; }
.hmi-curve .curve {
  fill: none; stroke: var(--cyan); stroke-width: 1.6;
  stroke-linecap: round; stroke-dasharray: 700; stroke-dashoffset: 700;
  animation: draw 2.4s ease-out forwards .5s;
}
@keyframes draw { to { stroke-dashoffset: 0; } }
.hmi-curve .curve-dot {
  fill: var(--cyan); filter: drop-shadow(0 0 4px rgba(77,208,225,.9));
  opacity: 0; animation: fadein .4s ease forwards 2.8s;
}
@keyframes fadein { to { opacity: 1; } }

.hmi-foot {
  display: flex; gap: 18px; margin-top: 12px;
  font-family: var(--font-mono); font-size: 11px; color: var(--faint);
}
.led-ledger { width: 6px; height: 6px; border-radius: 50%; display: inline-block; margin-right: 6px; }
.led-ledger.g { background: var(--green); }
.led-ledger.a { background: var(--amber); }

/* ── Hero 滚动条 ────────────────────────────────────────── */
.hero-strip {
  margin-top: 56px; border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden; background: rgba(15,20,28,.6);
  padding: 0 28px;
}
.strip-inner {
  display: flex; align-items: center; padding: 13px 0;
  white-space: nowrap; width: max-content;
  animation: marquee 32s linear infinite;
}
.strip-inner > * { margin-right: 34px; flex-shrink: 0; }
@keyframes marquee { to { transform: translateX(-50%); } }
.strip-inner span {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .24em;
  color: var(--faint);
}
.strip-inner i { width: 5px; height: 5px; background: var(--amber); transform: rotate(45deg); opacity: .7; }

/* ── 产品矩阵 ───────────────────────────────────────────── */
.products { background: transparent; }

.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.p-card {
  background: linear-gradient(180deg, var(--bg-3), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  display: flex; flex-direction: column; gap: 14px;
  position: relative; overflow: hidden;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.p-card::before {
  content: ''; position: absolute; inset: 0 auto auto 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
  opacity: 0; transition: opacity .25s;
}
.p-card:hover { transform: translateY(-4px); border-color: #2e4053; box-shadow: 0 18px 44px -18px rgba(0,0,0,.7); }
.p-card:hover::before { opacity: .9; }

.p-card-top { display: flex; justify-content: space-between; align-items: center; }
.p-num { font-family: var(--font-mono); font-size: 11px; color: var(--faint); letter-spacing: .2em; }
.p-icon { font-size: 22px; color: var(--amber); }

.p-card h3 { font-family: var(--font-serif); font-size: 19px; font-weight: 700; }
.p-desc { font-size: 13.5px; color: var(--muted); line-height: 1.75; flex: 1; }

.p-points { display: flex; flex-direction: column; gap: 7px; }
.p-points li { font-size: 12.5px; color: var(--muted); display: flex; gap: 8px; }
.p-points li::before { content: '▸'; color: var(--cyan); flex-shrink: 0; }

.p-link { font-size: 13px; color: var(--amber); font-weight: 600; margin-top: 4px; }
.p-link:hover { text-decoration: underline; }

/* ── 平台特性 ───────────────────────────────────────────── */
.platform {
  background: linear-gradient(180deg, transparent, rgba(20,27,37,.5) 30%, transparent 100%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

.feat {
  border: 1px solid var(--line-soft); border-radius: var(--radius);
  background: var(--bg-2); padding: 26px;
  transition: border-color .2s;
}
.feat:hover { border-color: #2e4053; }

.feat-ico { font-size: 24px; color: var(--cyan); }
.feat h4 { font-size: 16px; font-weight: 700; margin: 14px 0 8px; }
.feat p { font-size: 13.5px; color: var(--muted); line-height: 1.75; }

/* ── MES ────────────────────────────────────────────────── */
.mes { background: transparent; }

.mes-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 44px; align-items: start; }

.mes-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 34px; }

.mes-item { display: flex; gap: 16px; padding: 14px 0; border-bottom: 1px dashed var(--line-soft); }
.mes-item:hover h4 { color: var(--amber); }
.mes-idx {
  font-family: var(--font-mono); font-size: 12px; color: var(--faint);
  padding-top: 4px; flex-shrink: 0;
}
.mes-item h4 { font-size: 15px; font-weight: 700; transition: color .15s; }
.mes-item p { font-size: 13px; color: var(--muted); margin-top: 4px; line-height: 1.7; }

/* 终端卡片 */
.term {
  background: #080b10; border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 24px 60px -24px rgba(0,0,0,.7);
}
.term-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 10px 14px; background: var(--bg-3);
  border-bottom: 1px solid var(--line-soft);
}
.term-dot { width: 10px; height: 10px; border-radius: 50%; }
.term-dot.r { background: #f87171; } .term-dot.y { background: #fbbf24; } .term-dot.g { background: #34d399; }
.term-title { margin-left: 8px; font-family: var(--font-mono); font-size: 11px; color: var(--faint); letter-spacing: .08em; }
.term-body {
  font-family: var(--font-mono); font-size: 12px; line-height: 2.1;
  padding: 14px 16px; color: var(--muted); overflow-x: auto;
}
.t-time { color: var(--faint); }
.t-ok { color: var(--green); } .t-warn { color: var(--amber); } .t-val { color: var(--cyan); }
.t-now { color: var(--green); animation: liveblink .9s infinite; }

/* 已落地行业 */
.evidence {
  margin-top: 64px; border: 1px solid var(--line-soft); border-radius: var(--radius);
  background: var(--bg-2); padding: 22px 28px;
  display: flex; align-items: center; gap: 40px; flex-wrap: wrap;
}
.ev-label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em;
  color: var(--faint); writing-mode: horizontal-tb; flex-shrink: 0;
}
.ev-items { display: flex; gap: 44px; flex-wrap: wrap; }
.ev-item { display: flex; flex-direction: column; }
.ev-item b { font-size: 14.5px; font-weight: 700; }
.ev-item small { font-size: 12px; color: var(--muted); margin-top: 2px; }
.ev-item::before { content: '▸'; color: var(--amber); font-size: 12px; margin-bottom: 2px; }

/* 性能数字 */
.perf {
  margin-top: 20px; display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line-soft); border-radius: var(--radius); overflow: hidden;
}
.perf-item { padding: 20px 24px; background: var(--bg-3); display: flex; flex-direction: column; }
.perf-item + .perf-item { border-left: 1px solid var(--line-soft); }
.perf-item b { font-size: 24px; font-weight: 600; color: var(--amber); }
.perf-item span { font-size: 12.5px; color: var(--muted); margin-top: 4px; }

/* ── 成功案例 ────────────────────────────────────────────── */
.cases {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.cases-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.case-card {
  background: var(--bg-2); border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 24px 22px; display: flex; flex-direction: column; gap: 12px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.case-card:hover { transform: translateY(-4px); border-color: #2e4053; box-shadow: 0 18px 44px -18px rgba(0,0,0,.7); }
.case-tag {
  align-self: flex-start; font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: .14em; color: var(--amber);
  border: 1px solid rgba(255,176,32,.35); border-radius: 3px; padding: 3px 9px;
}
.case-card h3 { font-family: var(--font-serif); font-size: 17px; font-weight: 700; line-height: 1.5; }
.case-points { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.case-points li { font-size: 13px; color: var(--muted); line-height: 1.65; padding-left: 16px; position: relative; }
.case-points li::before { content: '✔'; color: var(--green); font-size: 11px; position: absolute; left: 0; top: 1px; }

.case-detail {
  margin-top: 44px; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, var(--bg-3), var(--bg-2)); padding: 30px 32px;
}
.case-detail-head h3 { font-family: var(--font-serif); font-size: 21px; font-weight: 700; margin: 14px 0 8px; }
.case-detail-head .sec-desc { margin-top: 8px; }
.case-detail-cols { display: grid; grid-template-columns: 1fr 1.6fr; gap: 36px; margin-top: 18px; }
.case-detail-col h4 {
  font-size: 13px; font-weight: 700; color: var(--cyan);
  font-family: var(--font-mono); letter-spacing: .06em;
  margin: 18px 0 12px; padding-top: 14px; border-top: 1px dashed var(--line-soft);
}
.case-detail-col h4:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.case-detail-col .case-points li { color: var(--text); font-size: 13.5px; }

/* ── 成功案例 ───────────────────────────────────────────── */
.cases {
  background: linear-gradient(180deg, transparent, rgba(20,27,37,.5) 30%, transparent 100%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-bottom: 24px; }

.case-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg-2); padding: 26px 26px 22px;
  transition: transform .2s ease, border-color .2s ease;
}
.case-card:hover { transform: translateY(-3px); border-color: #2e4053; }

.case-tag {
  display: inline-block;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--cyan); border: 1px solid rgba(77,208,225,.35);
  padding: 3px 10px; border-radius: 3px; margin-bottom: 12px;
}

.case-card h3 { font-family: var(--font-serif); font-size: 17px; font-weight: 700; margin-bottom: 10px; }

.case-points { display: flex; flex-direction: column; gap: 7px; }
.case-points li { font-size: 13px; color: var(--muted); display: flex; gap: 8px; line-height: 1.7; }
.case-points li::before { content: '✔'; color: var(--green); flex-shrink: 0; font-size: 11px; padding-top: 2px; }

.case-detail {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, var(--bg-3), var(--bg-2));
  padding: 30px 30px 26px;
}
.case-detail-head { margin-bottom: 20px; }
.case-detail-head h3 { font-family: var(--font-serif); font-size: 20px; font-weight: 700; margin: 4px 0 8px; }
.case-detail-head .sec-desc { margin-top: 6px; font-size: 13.5px; }

.case-detail-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; }
.case-detail-col h4 {
  font-size: 13px; font-weight: 700; color: var(--amber);
  letter-spacing: .05em; margin-bottom: 12px;
}
.case-detail-col h4:not(:first-child) { margin-top: 18px; }

/* ── 设备管理 · 数字孪生 ────────────────────────────────── */
.equipment {
  background: linear-gradient(180deg, transparent, rgba(20,27,37,.5) 30%, transparent 100%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.eq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }

.eq-twin {
  background: linear-gradient(180deg, var(--bg-3), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; position: relative; overflow: hidden;
}
.eq-twin::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(circle at 50% 45%, rgba(77,208,225,.07), transparent 55%);
}
.twin-svg { width: 100%; height: auto; }
.twin-hotspot circle:first-child { animation: hsring 2.4s ease-out infinite; transform-origin: center; }
@keyframes hsring {
  0% { transform: scale(.55); opacity: .85; }
  80%, 100% { transform: scale(1.25); opacity: 0; }
}
.twin-cap {
  margin-top: 14px; display: flex; align-items: center; gap: 10px;
  font-size: 12.5px; color: var(--muted);
  border-top: 1px dashed var(--line-soft); padding-top: 14px;
}
.twin-cap-tag {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em;
  color: var(--cyan); border: 1px solid rgba(77,208,225,.35);
  padding: 3px 9px; border-radius: 3px; flex-shrink: 0;
}

.eq-list { display: flex; flex-direction: column; }
.eq-item { display: flex; gap: 18px; padding: 18px 0; border-bottom: 1px dashed var(--line-soft); }
.eq-item:last-child { border-bottom: none; }
.eq-ico { font-size: 20px; color: var(--amber); padding-top: 3px; }
.eq-item h4 { font-size: 16px; font-weight: 700; }
.eq-item p { font-size: 13.5px; color: var(--muted); margin-top: 5px; line-height: 1.75; }

/* ── 技术底座 ───────────────────────────────────────────── */
.stack-flow {
  display: flex; align-items: stretch; gap: 12px; flex-wrap: wrap;
  margin-bottom: 34px;
}
.s-node {
  flex: 1; min-width: 170px; text-align: center;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg-2); padding: 20px 14px;
  display: flex; flex-direction: column; gap: 6px; justify-content: center;
  transition: border-color .2s, transform .2s;
}
.s-node:hover { border-color: var(--amber); transform: translateY(-3px); }
.s-node span { font-size: 14px; font-weight: 700; }
.s-node small { font-family: var(--font-mono); font-size: 10.5px; color: var(--faint); letter-spacing: .04em; }
.s-arrow { display: flex; align-items: center; color: var(--amber); font-size: 18px; }

.stack-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.stack-tags li {
  font-family: var(--font-mono); font-size: 11.5px;
  border: 1px solid var(--line); border-radius: 20px;
  padding: 5px 14px; color: var(--muted);
  background: var(--bg-2);
  transition: color .15s, border-color .15s;
}
.stack-tags li:hover { color: var(--cyan); border-color: var(--cyan); }

/* ── 文档资源 ───────────────────────────────────────────── */
.doc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

.doc-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg-2); padding: 22px 24px;
  display: flex; gap: 16px; align-items: flex-start;
  transition: transform .18s, border-color .18s, box-shadow .18s;
}
.doc-card:hover {
  transform: translateY(-3px); border-color: #2e4053;
  box-shadow: 0 16px 40px -20px rgba(0,0,0,.7);
}
.doc-ico { font-size: 24px; line-height: 1; }
.doc-card h4 { font-size: 15px; font-weight: 700; }
.doc-card p { font-size: 12.5px; color: var(--muted); margin-top: 6px; line-height: 1.7; }
.doc-go { margin-left: auto; color: var(--faint); transition: color .15s, transform .15s; font-size: 16px; }
.doc-card:hover .doc-go { color: var(--amber); transform: translateX(3px); }

/* ── 联系我们 ───────────────────────────────────────────── */
.contact {
  background: linear-gradient(180deg, transparent, rgba(20,27,37,.5) 30%, transparent 100%);
  border-top: 1px solid var(--line-soft);
}

.contact-grid {
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 44px;
  align-items: center;
}

.contact-cards { display: flex; flex-direction: column; gap: 14px; }

.c-card {
  display: flex; gap: 18px; align-items: flex-start;
  border: 1px solid var(--line-soft); border-radius: var(--radius);
  background: var(--bg-2); padding: 20px 24px;
  transition: border-color .18s, transform .18s;
}
a.c-card:hover { border-color: var(--amber); transform: translateX(4px); }

.c-ico {
  width: 42px; height: 42px; border-radius: 8px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 19px; color: var(--amber);
  background: var(--amber-dim); border: 1px solid rgba(255,176,32,.2);
}

.c-card h4 { font-size: 14px; font-weight: 700; letter-spacing: .04em; }
.c-card p { font-family: var(--font-mono); font-size: 15px; color: var(--text); margin-top: 5px; }
.c-card small { font-size: 12px; color: var(--muted); display: block; margin-top: 5px; }

.contact-qr { text-align: center; }

.qr-grid { display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; }

.qr-item { display: flex; flex-direction: column; align-items: center; }

.qr-box {
  display: inline-block; padding: 14px; border-radius: 12px;
  background: #ffffff;
  border: 1px solid var(--line);
  box-shadow: 0 20px 50px -20px rgba(0,0,0,.7), 0 0 0 1px rgba(0,0,0,.3);
}
.qr-box img { width: 220px; height: auto; display: block; }

.qr-ph {
  width: 220px; height: 220px;
  background:
    linear-gradient(45deg, #f2f5f9 25%, transparent 25%, transparent 75%, #f2f5f9 75%),
    linear-gradient(45deg, #f2f5f9 25%, #ffffff 25%, #ffffff 75%, #f2f5f9 75%);
  background-size: 16px 16px;
  background-position: 0 0, 8px 8px;
  display: flex; align-items: center; justify-content: center;
}
.qr-ph::after {
  content: '微信二维码\n更新中';
  white-space: pre-line;
  font-size: 12px; color: var(--faint); letter-spacing: .06em;
  background: rgba(255,255,255,.85); padding: 6px 12px; border-radius: 6px;
}

.qr-cap {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .22em;
  color: var(--amber); margin-top: 14px;
}
.qr-hint { font-size: 12px; color: var(--muted); margin-top: 10px; line-height: 1.8; }

/* ── CTA ────────────────────────────────────────────────── */
.cta { padding: 90px 0; }

.cta-box {
  border: 1px solid var(--line); border-radius: 14px;
  background:
    radial-gradient(ellipse 60% 120% at 50% -20%, rgba(255,176,32,.09), transparent 60%),
    var(--bg-3);
  padding: 64px 48px; text-align: center;
}
.cta-box h2 { font-family: var(--font-serif); font-size: clamp(26px, 3.4vw, 36px); font-weight: 700; }
.cta-box p { color: var(--muted); margin: 14px 0 30px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ── Footer ─────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--line-soft);
  background: var(--bg-2);
  padding: 56px 0 30px;
}
.foot-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; margin-bottom: 44px;
}
.foot-brand p { font-size: 13px; color: var(--muted); margin-top: 14px; max-width: 300px; }
.foot-col h5 { font-size: 12px; letter-spacing: .14em; color: var(--faint); margin-bottom: 16px; }
.foot-col a {
  display: block; font-size: 13.5px; color: var(--muted);
  padding: 5px 0; transition: color .15s;
}
.foot-col a:hover { color: var(--amber); }
.foot-bottom {
  border-top: 1px solid var(--line-soft); padding-top: 22px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: 12px; color: var(--faint);
}
.foot-built { font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; }

/* ── 滚动揭示动画 ───────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

.d1 { transition-delay: .1s; } .d2 { transition-delay: .22s; } .d3 { transition-delay: .34s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .strip-inner, .hmi-curve .curve, .dot-pulse, .hmi-tag,
  li.warn .led, .t-now, .twin-hotspot circle:first-child,
  .curve-dot { animation: none !important; }
  html { scroll-behavior: auto; }
}

/* ── 响应式 ─────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .mes-grid { grid-template-columns: 1fr; }
  .eq-grid { grid-template-columns: 1fr; }
  .doc-grid { grid-template-columns: repeat(2, 1fr); }
  .perf { grid-template-columns: repeat(2, 1fr); }
  .perf-item:nth-child(3) { border-left: none; }
  .perf-item:nth-child(n+3) { border-top: 1px solid var(--line-soft); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .case-detail-cols { grid-template-columns: 1fr; gap: 8px; }
}

@media (max-width: 720px) {
  section { padding: 80px 0; }
  .nav-links { display: none; }
  .nav-actions .btn-ghost { display: none; }
  .product-grid { grid-template-columns: 1fr; }
  .feat-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .case-detail { padding: 24px 20px; }
  .doc-grid { grid-template-columns: 1fr; }
  .mes-cols { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .stack-flow { flex-direction: column; }
  .s-arrow { transform: rotate(90deg); justify-content: center; }
  .evidence { flex-direction: column; align-items: flex-start; gap: 18px; }
  .cta-box { padding: 44px 24px; }
  .contact-grid { grid-template-columns: 1fr; }
  .qr-box img { width: 180px; }
  .cases-grid { grid-template-columns: 1fr; }
  .case-detail-cols { grid-template-columns: 1fr; }
}