/* ==========================================================================
   风机控制系统 · 产品站样式
   手机优先（mobile-first），断点：560 / 720 / 860 / 960 / 1200
   ========================================================================== */

/* ---------- tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --bg-deep: #0a1220;
  --bg-deep-2: #0d1a2e;

  --ink: #0b1220;
  --ink-2: #1e293b;
  --text: #334155;
  --muted: #64748b;
  --faint: #94a3b8;

  --line: #e3e9f2;
  --line-2: #eef2f8;
  --line-dark: rgba(148, 178, 214, 0.16);

  --brand: #1668e3;
  --brand-600: #1257c4;
  --brand-soft: #eaf1fe;
  --cyan: #06b6d4;
  --cyan-soft: #e6fbff;
  --amber: #f59e0b;
  --green: #10b981;
  --violet: #7c3aed;

  --r-sm: 12px;
  --r: 18px;
  --r-lg: 24px;

  --shadow-1: 0 1px 2px rgba(11, 18, 32, 0.05);
  --shadow-2: 0 1px 2px rgba(11, 18, 32, 0.06), 0 16px 36px -18px rgba(11, 18, 32, 0.28);
  --shadow-3: 0 30px 70px -32px rgba(11, 18, 32, 0.42);

  --maxw: 1200px;
  --nav-h: 56px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --mono: "SFMono-Regular", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
}

@media (min-width: 768px) {
  :root { --nav-h: 64px; }
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  padding-top: var(--nav-h);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
h1, h2, h3, h4, h5 {
  margin: 0;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.012em;
}
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; }
strong { color: var(--ink); font-weight: 650; }
::selection { background: #cfe1ff; color: #0b1220; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 4px; }

/* ---------- layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 18px;
}
@media (min-width: 768px) { .wrap { padding-inline: 32px; } }

.sec { padding: clamp(46px, 7vw, 86px) 0; }
.sec--tight { padding: clamp(34px, 5vw, 60px) 0; }
.sec--soft { background: var(--bg-soft); }
.sec--ink {
  background: var(--bg-deep);
  color: #c3d3e6;
}
.sec--ink h2, .sec--ink h3, .sec--ink h4, .sec--ink strong { color: #fff; }
.sec--ink .sec-head p { color: #98abc4; }

.sec-head { max-width: 760px; margin-bottom: clamp(24px, 4vw, 44px); }
.sec-head--center { margin-inline: auto; text-align: center; }
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brand);
}
.kicker::before {
  content: "";
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  opacity: 0.7;
}
.sec--ink .kicker { color: #63d3f5; }
.sec-head h2 { font-size: clamp(1.26rem, 3.5vw, 2.3rem); margin-bottom: 12px; }
.sec-head p { color: var(--muted); font-size: clamp(0.95rem, 1.3vw, 1.0625rem); }

.grid { display: grid; gap: 14px; }
.grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
@media (min-width: 560px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 720px) {
  .grid { gap: 18px; }
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 980px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ==========================================================================
   顶部导航（与 meshiot.com 一致）
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 120;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.13);
}
.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: var(--nav-h);
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: 16px;
}
@media (min-width: 1024px) { .site-header__bar { padding-inline: 32px; } }

.brand {
  display: flex;
  align-items: center;
  flex: 0 1 auto;
  min-width: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: #475569;
  letter-spacing: -0.01em;
}
.brand img { width: 30px; height: 30px; margin-right: 8px; object-fit: contain; flex: none; }
.brand span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@media (min-width: 1024px) { .brand { font-size: 1.25rem; } .brand img { margin-right: 12px; } }

.nav-desktop { display: none; }
@media (min-width: 1024px) {
  .nav-desktop { display: flex; align-items: center; gap: 22px; }
}
.nav-item { position: relative; padding-block: 8px; }
.nav-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0;
  border: 0;
  background: none;
  font-size: 0.9375rem;
  color: #374151;
  cursor: pointer;
  transition: color 0.18s;
}
.nav-item:hover .nav-trigger, .nav-item:focus-within .nav-trigger { color: var(--brand); }
.nav-trigger .ic { width: 14px; height: 14px; opacity: 0.65; transition: transform 0.2s; }
.nav-item:hover .nav-trigger .ic { transform: rotate(180deg); }

.nav-drop {
  position: absolute;
  top: 100%;
  left: 0;
  width: 196px;
  padding: 8px 0;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 14px 38px rgba(11, 18, 32, 0.16);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.18s, transform 0.18s, visibility 0.18s;
}
.nav-item:hover .nav-drop, .nav-item:focus-within .nav-drop {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-drop a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  font-size: 0.9rem;
  color: #374151;
  transition: background 0.15s, color 0.15s;
}
.nav-drop a:hover { background: #eff6ff; color: #2563eb; }
.nav-drop .ic { width: 16px; height: 16px; flex: none; }
.nav-drop .ic--blue { color: #2563eb; }
.nav-drop .ic--green { color: #16a34a; }
.nav-drop .ic--orange { color: #f97316; }
.nav-drop .ic--violet { color: #8b5cf6; }

.nav-link { font-size: 0.9375rem; color: #374151; transition: color 0.18s; }
.nav-link:hover { color: var(--brand); }
.nav-link--hot { color: var(--brand); font-weight: 600; }

/* 移动端菜单 */
.burger { display: block; }
@media (min-width: 1024px) { .burger { display: none; } }
.burger > summary {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  margin-right: -6px;
  list-style: none;
  cursor: pointer;
  color: #374151;
  border-radius: 10px;
}
.burger > summary::-webkit-details-marker { display: none; }
.burger > summary:hover { background: #f1f5f9; }
.burger .ic { width: 24px; height: 24px; }
.burger[open] > summary { background: #f1f5f9; }

.burger-panel {
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  max-height: calc(100vh - var(--nav-h));
  overflow-y: auto;
  background: #fff;
  border-top: 1px solid var(--line);
  box-shadow: 0 18px 30px rgba(11, 18, 32, 0.16);
  padding: 10px 16px 22px;
}
.burger-group { padding: 10px 0 6px; border-bottom: 1px dashed var(--line); }
.burger-group:last-child { border-bottom: 0; }
.burger-group__title {
  padding: 4px 0 6px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #94a3b8;
  text-transform: uppercase;
}
.burger-panel a.burger-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 2px;
  font-size: 0.95rem;
  color: #374151;
}
.burger-panel a.burger-link:active { background: #f8fafc; }
.burger-panel .ic { width: 17px; height: 17px; color: #64748b; }

/* ==========================================================================
   产品内二级导航
   ========================================================================== */
.pnav {
  position: sticky;
  top: var(--nav-h);
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.pnav__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 6px;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 9px 16px;
}
@media (min-width: 768px) { .pnav__inner { padding-inline: 32px; } }
.pnav__label {
  display: none;
  flex: none;
  margin-right: 8px;
  padding-right: 14px;
  border-right: 1px solid var(--line);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #94a3b8;
  text-transform: uppercase;
}
@media (min-width: 1024px) { .pnav__label { display: block; } }
.pnav a {
  flex: none;
  padding: 7px 13px;
  border-radius: 999px;
  font-size: 0.875rem;
  color: #475569;
  white-space: nowrap;
  transition: background 0.18s, color 0.18s;
}
.pnav a:hover { background: #f1f5f9; color: var(--ink); }
.pnav a.is-active { background: var(--ink); color: #fff; font-weight: 600; }
.pnav a.is-cta { margin-left: 4px; color: var(--brand); background: var(--brand-soft); font-weight: 600; }
.pnav a.is-cta:hover { background: #dbeafe; color: var(--brand-600); }

/* 平板：胶囊略收紧，保证仍是一行排完 */
@media (max-width: 1023px) {
  .pnav__inner { gap: 5px; }
  .pnav a { padding: 6px 11px; font-size: 0.84rem; }
}

/* 手机：再收紧一点，10 个栏目两行内排完（360–414 都是 5+5），全部可见不被裁 */
@media (max-width: 480px) {
  .pnav__inner { gap: 4px; padding: 8px 10px; }
  .pnav a { padding: 4px 8px; font-size: 0.76rem; }
  .pnav a.is-cta { margin-left: 0; }
}

/* 超窄屏（320–340）：再收一档，仍保持两行，避免最后一行只剩一个栏目 */
@media (max-width: 340px) {
  .pnav__inner { gap: 3px; padding: 7px 8px; }
  .pnav a { padding: 3px 6px; font-size: 0.72rem; }
}

/* ==========================================================================
   按钮 / 标签
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s, border-color 0.18s, color 0.18s;
  white-space: nowrap;
}
.btn .ic { width: 18px; height: 18px; }
.btn--primary { background: var(--brand); color: #fff; box-shadow: 0 10px 24px -12px rgba(22, 104, 227, 0.9); }
.btn--primary:hover { background: var(--brand-600); transform: translateY(-2px); box-shadow: 0 16px 30px -14px rgba(22, 104, 227, 0.95); }
.btn--ghost { border-color: rgba(148, 178, 214, 0.38); color: #dbe7f5; background: rgba(255, 255, 255, 0.04); }
.btn--ghost:hover { background: rgba(255, 255, 255, 0.1); border-color: rgba(148, 178, 214, 0.7); color: #fff; }
.btn--outline { border-color: var(--line); color: var(--ink); background: #fff; }
.btn--outline:hover { border-color: #bcd3f6; background: #f7faff; transform: translateY(-2px); }
.btn--light { background: #fff; color: #0b3b8c; }
.btn--light:hover { background: #eaf1fe; transform: translateY(-2px); }
.btn--sm { padding: 9px 15px; font-size: 0.875rem; border-radius: 10px; }
.btn--block { width: 100%; }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn-row--center { justify-content: center; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  border: 1px solid rgba(148, 178, 214, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: #c8d8ea;
  font-size: 0.8125rem;
  line-height: 1.4;
}
.chip .ic { width: 15px; height: 15px; color: #63d3f5; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 8px;
  background: #f1f5f9;
  color: #475569;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.5;
}
.tag--blue { background: var(--brand-soft); color: var(--brand-600); }
.tag--cyan { background: var(--cyan-soft); color: #0e7490; }
.tag--green { background: #e9fbf3; color: #047857; }
.tag--amber { background: #fef5e4; color: #b45309; }
.tag--violet { background: #f3ecff; color: #6d28d9; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(38px, 7vw, 84px) 0 clamp(44px, 7vw, 92px);
  background:
    radial-gradient(900px 460px at 78% -12%, rgba(22, 104, 227, 0.45), transparent 65%),
    radial-gradient(700px 420px at 8% 108%, rgba(6, 182, 212, 0.18), transparent 62%),
    linear-gradient(180deg, #0a1220 0%, #0b1526 55%, #0a1220 100%);
  color: #dae6f4;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 178, 214, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 178, 214, 0.075) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
  pointer-events: none;
}
.hero > .wrap { position: relative; z-index: 1; }
.hero__grid { display: grid; gap: 38px; align-items: center; }
@media (min-width: 960px) {
  .hero__grid { grid-template-columns: 1.06fr 0.94fr; gap: 48px; }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 6px 13px;
  border: 1px solid rgba(99, 211, 245, 0.28);
  border-radius: 999px;
  background: rgba(6, 182, 212, 0.09);
  color: #7dd3fc;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}
.eyebrow .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 4px rgba(52, 211, 153, 0.16);
}
.hero h1 {
  margin-bottom: 16px;
  color: #fff;
  font-size: clamp(1.55rem, 7vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.028em;
  line-height: 1.1;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, #7dd3fc 10%, #a7c8ff 55%, #7dd3fc 95%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lead {
  max-width: 46ch;
  color: #a7b9cf;
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.75;
}
.hero .lead strong { color: #e8f1fb; font-weight: 650; }
.hero .btn-row { margin-top: 26px; }
.hero .chip-row { margin-top: 22px; }

/* 紧凑 Hero（内页） */
.hero--compact { padding: clamp(30px, 5vw, 62px) 0 clamp(34px, 5vw, 60px); }
.hero--compact h1 { font-size: clamp(1.4rem, 5vw, 2.55rem); margin-bottom: 12px; }
.hero--compact .lead { max-width: 62ch; }
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 16px;
  color: #7f94ad;
  font-size: 0.78rem;
}
.crumb a { color: #9fb3c9; }
.crumb a:hover { color: #fff; }
.crumb span.sep { opacity: 0.45; }

/* 风机转子可视化 */
.hero__viz { position: relative; }
.rotor {
  position: relative;
  width: min(100%, 380px);
  margin-inline: auto;
  aspect-ratio: 1 / 1;
}
@media (min-width: 1100px) { .rotor { width: 430px; } }
@media (max-width: 559px) {
  .rotor { width: min(78%, 240px); }
}
.rotor__glow {
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(22, 104, 227, 0.42), rgba(6, 182, 212, 0.12) 52%, transparent 70%);
  filter: blur(6px);
}
.rotor__svg { position: relative; width: 100%; height: 100%; }
.rotor__blades { transform-box: view-box; transform-origin: 50% 50%; animation: spin 7.5s linear infinite; }
.rotor__orbit { transform-box: view-box; transform-origin: 50% 50%; animation: spin 26s linear infinite reverse; }
.rotor__hub { fill: #0b1526; stroke: rgba(125, 211, 252, 0.4); stroke-width: 1.5; }
@keyframes spin { to { transform: rotate(360deg); } }

.tele {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  width: min(100%, 340px);
  margin: -8px auto 0;
  padding: 1px;
  border: 1px solid rgba(148, 178, 214, 0.2);
  border-radius: 16px;
  background: rgba(148, 178, 214, 0.18);
  overflow: hidden;
  /* 玻璃拟态 */
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.8);
}
.tele > div {
  padding: 12px 14px;
  background: rgba(11, 21, 38, 0.86);
  backdrop-filter: blur(10px);
}
.tele b {
  display: block;
  color: #fff;
  font-size: 1.15rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.3;
}
.tele b small { font-size: 0.7rem; color: #7f94ad; font-weight: 500; margin-left: 2px; }
.tele span { display: block; color: #8298b1; font-size: 0.7rem; letter-spacing: 0.04em; }
.tele .ok { color: #34d399; }
@media (min-width: 1100px) {
  .tele {
    position: absolute;
    left: 0;
    bottom: -9%;
    width: 300px;
    margin: 0;
    box-shadow: 0 26px 60px -26px rgba(0, 0, 0, 0.85);
  }
}

/* ==========================================================================
   统计条
   ========================================================================== */
.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--line);
  overflow: hidden;
}
@media (min-width: 860px) { .stats { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.stat { padding: 20px 16px; background: #fff; }
.stat b {
  display: block;
  color: var(--ink);
  font-size: clamp(1.55rem, 4vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}
.stat b i { font-style: normal; font-size: 0.55em; font-weight: 600; color: var(--muted); margin-left: 3px; }
.stat > span { display: block; margin-top: 4px; color: var(--muted); font-size: 0.8rem; }

/* ==========================================================================
   卡片
   ========================================================================== */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #fff;
  box-shadow: var(--shadow-1);
  transition: transform 0.22s, box-shadow 0.22s, border-color 0.22s;
}
.card:hover { transform: translateY(-3px); border-color: #c9dcf9; box-shadow: var(--shadow-2); }
.card h3 { margin-bottom: 8px; font-size: 1.0625rem; }
.card p { color: var(--muted); font-size: 0.9rem; line-height: 1.7; }
.card__num {
  position: absolute;
  top: 16px; right: 18px;
  color: #eef2f8;
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  pointer-events: none;
}
.icon-badge {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  margin-bottom: 14px;
  border-radius: 13px;
  background: var(--brand-soft);
  color: var(--brand);
}
.icon-badge .ic { width: 22px; height: 22px; }
.icon-badge--cyan { background: var(--cyan-soft); color: #0e7490; }
.icon-badge--green { background: #e9fbf3; color: #059669; }
.icon-badge--amber { background: #fef5e4; color: #d97706; }
.icon-badge--violet { background: #f3ecff; color: #7c3aed; }
.icon-badge--ink { background: #0b1220; color: #7dd3fc; }

.card--ink {
  background: #0e1a2c;
  border-color: rgba(148, 178, 214, 0.16);
  color: #b9cadd;
  box-shadow: none;
}
.card--ink h3 { color: #fff; }
.card--ink p { color: #9db0c6; }
.card--ink .icon-badge { background: rgba(125, 211, 252, 0.12); color: #7dd3fc; }
.card--ink:hover { border-color: rgba(125, 211, 252, 0.35); box-shadow: 0 20px 40px -24px rgba(0, 0, 0, 0.8); }

.card--link { display: flex; flex-direction: column; }
.card__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--brand);
  font-size: 0.85rem;
  font-weight: 650;
}
.card__cta .ic { width: 15px; height: 15px; transition: transform 0.2s; }
.card--link:hover .card__cta .ic { transform: translateX(4px); }

/* 特性列表 */
.feature-list { display: grid; gap: 10px; margin-top: 14px; }
.feature-list li {
  display: flex;
  gap: 9px;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.6;
}
.feature-list .ic { flex: none; width: 17px; height: 17px; margin-top: 3px; color: var(--green); }

/* ==========================================================================
   分层架构
   ========================================================================== */
.layers { display: grid; gap: 12px; }
.layer {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--layer-c, var(--brand));
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow-1);
}
@media (min-width: 860px) {
  .layer { grid-template-columns: 210px minmax(0, 1fr); align-items: center; gap: 20px; }
}
.layer__id { display: flex; align-items: center; gap: 11px; }
.layer__id .ic { width: 22px; height: 22px; color: var(--layer-c, var(--brand)); flex: none; }
.layer__id b { display: block; color: var(--ink); font-size: 0.975rem; line-height: 1.4; }
.layer__id small { display: block; color: var(--faint); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; }
.layer__chips { display: flex; flex-wrap: wrap; gap: 6px; }
.layer__chips span {
  padding: 4px 10px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: #f8fafc;
  color: #475569;
  font-size: 0.78rem;
  line-height: 1.5;
}
.layers__flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--faint);
  font-size: 0.75rem;
}
.layers__flow .ic { width: 16px; height: 16px; transform: rotate(90deg); }

/* ==========================================================================
   拓扑 / 流程图
   ========================================================================== */
.topo {
  padding: clamp(16px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background:
    linear-gradient(#fff, #fff) padding-box,
    repeating-linear-gradient(45deg, #f8fafc 0 10px, #fff 10px 20px) border-box;
}
.lane + .lane { margin-top: 18px; padding-top: 18px; border-top: 1px dashed var(--line); }
.lane__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
}
.lane__head .legend-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--brand); }
.lane--control .legend-dot { background: var(--cyan); }
.lane--sense .legend-dot { background: var(--amber); }

.nodes { display: grid; gap: 8px; }
@media (min-width: 860px) {
  .nodes { display: flex; align-items: stretch; gap: 6px; }
  .node { flex: 1 1 0; min-width: 0; }
  .nodes__arrow { flex: 0 0 14px; }
}
.node {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #fff;
  box-shadow: 0 1px 2px rgba(11, 18, 32, 0.04);
  text-align: left;
}
.node b { color: var(--ink); font-size: 0.86rem; line-height: 1.35; }
.node span { color: var(--faint); font-size: 0.7rem; line-height: 1.4; }
.node--brand { border-color: #c7dcfb; background: #f5f9ff; }
.node--brand b { color: var(--brand-600); }
.node--cyan { border-color: #b9ecf5; background: #f2fdff; }
.node--amber { border-color: #fbe3b4; background: #fffaf1; }
.node--dark { border-color: #0b1220; background: #0b1220; }
.node--dark b { color: #fff; }
.node--dark span { color: #8298b1; }
.nodes__arrow {
  display: grid;
  place-items: center;
  color: #b6c4d4;
}
.nodes__arrow .ic { width: 16px; height: 16px; transform: rotate(90deg); }
@media (min-width: 860px) { .nodes__arrow .ic { transform: none; } }
.topo__note { margin-top: 14px; color: var(--faint); font-size: 0.75rem; }

/* ==========================================================================
   表格
   ========================================================================== */
.tbl-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #fff;
  -webkit-overflow-scrolling: touch;
}
.tbl { width: 100%; min-width: 560px; border-collapse: collapse; font-size: 0.875rem; }
.tbl th {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  background: #f8fafc;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: left;
  white-space: nowrap;
}
.tbl td { padding: 12px 14px; border-bottom: 1px solid var(--line-2); color: var(--muted); vertical-align: top; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl tbody tr:hover td { background: #fbfdff; }
.tbl td:first-child { color: var(--ink); font-weight: 650; white-space: nowrap; }
.tbl .num { font-variant-numeric: tabular-nums; }
.tbl-hint { margin-top: 8px; color: var(--faint); font-size: 0.73rem; }

/* 键值规格 */
.kv { border-top: 1px solid var(--line); }
.kv > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--line-2);
  font-size: 0.875rem;
}
.kv dt { color: var(--muted); }
.kv dd { margin: 0; color: var(--ink); font-weight: 600; text-align: right; }

/* ==========================================================================
   分栏
   ========================================================================== */
.split { display: grid; gap: 24px; align-items: center; }
@media (min-width: 900px) { .split { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 44px; } }
.split--wide-left { }
@media (min-width: 900px) { .split--wide-left { grid-template-columns: 1.15fr 0.85fr; } }
.split__body h2 { font-size: clamp(1.2rem, 3.2vw, 1.9rem); margin-bottom: 12px; }
.split__body > p { color: var(--muted); font-size: 0.95rem; }

/* 接线示意图（img/schematic.svg）：桌面文左图右，手机文在上图在下 */
.split--wiring { margin-top: 34px; gap: 26px; }
/* 首页该区块用 h2，内页已有 section 级 h2，这里用小标题，字号与 .split__body h2 对齐 */
.wiring__title { font-size: clamp(1.2rem, 3.2vw, 1.9rem); margin-bottom: 12px; }
@media (min-width: 900px) {
  .split--wiring { grid-template-columns: 1.05fr 0.95fr; gap: 44px; }
}
/* 图高约 1.93 倍宽，单列时要限宽，否则平板宽度下会拉出上千像素长条 */
.wiring { margin: 0 auto; max-width: 440px; text-align: center; }
/* 边框与留白放在链接上，图片本身保持 100% 宽——否则 content-box + padding 会把图撑出容器 */
.wiring__link {
  display: block; background: #fff;
  border: 1px solid var(--line); border-radius: 14px;
  padding: 8px; box-shadow: var(--shadow-2);
}
.wiring img { display: block; width: 100%; height: auto; }
@media (min-width: 900px) {
  .wiring__link { display: inline-block; max-width: 100%; }
  .wiring img { width: auto; max-height: 680px; }
}
.wiring figcaption { margin-top: 10px; font-size: 0.78rem; color: var(--muted); }

.wiring-list {
  list-style: none; margin: 16px 0 0; padding: 0;
  display: grid; gap: 13px; counter-reset: wl;
}
.wiring-list li {
  position: relative; padding-left: 34px;
  font-size: 0.9rem; line-height: 1.65; color: var(--muted);
}
.wiring-list li::before {
  counter-increment: wl; content: counter(wl);
  position: absolute; left: 0; top: 1px;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--brand-soft); color: var(--brand);
  font-size: 0.72rem; font-weight: 700;
  display: grid; place-items: center;
}
.wiring-list b { display: block; margin-bottom: 2px; font-size: 0.95rem; color: var(--ink); }
.wiring-list li.is-warn::before { background: #fff6e7; color: #b26a00; }
.wiring-list li.is-warn b { color: #b26a00; }

/* 面板 */
.panel {
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #fff;
  box-shadow: var(--shadow-2);
}
.panel--soft { background: var(--bg-soft); box-shadow: none; }
.panel--ink { background: #0e1a2c; border-color: rgba(148, 178, 214, 0.18); color: #b9cadd; }

/* 步骤 */
.steps { display: grid; gap: 12px; counter-reset: s; }
.step {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #fff;
}
.step::before {
  counter-increment: s;
  content: counter(s, decimal-leading-zero);
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--brand-soft);
  color: var(--brand-600);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
}
.step b { display: block; color: var(--ink); font-size: 0.9rem; margin-bottom: 2px; }
.step p { color: var(--muted); font-size: 0.84rem; line-height: 1.65; }

/* 注释块 */
.note {
  display: flex;
  gap: 10px;
  padding: 13px 15px;
  border: 1px solid #fbe3b4;
  border-left: 3px solid var(--amber);
  border-radius: 10px;
  background: #fffbf2;
  color: #7c5a12;
  font-size: 0.83rem;
  line-height: 1.65;
}
.note .ic { flex: none; width: 17px; height: 17px; margin-top: 2px; color: #d97706; }
.note--blue { border-color: #cfe1fb; border-left-color: var(--brand); background: #f6faff; color: #1d4b8f; }
.note--blue .ic { color: var(--brand); }

/* ==========================================================================
   体验卡片
   ========================================================================== */
.demo-grid { display: grid; gap: 16px; }
@media (min-width: 720px) { .demo-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.demo {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: #fff;
  box-shadow: var(--shadow-1);
  transition: transform 0.22s, box-shadow 0.22s, border-color 0.22s;
}
.demo:hover { transform: translateY(-4px); box-shadow: var(--shadow-3); border-color: #c9dcf9; }

.demo__screen {
  position: relative;
  padding: 14px 14px 0;
  background: linear-gradient(160deg, #10233f, #0a1424 65%, #0d1b30);
  overflow: hidden;
}
.demo__screen::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(125, 211, 252, 0.14) 1px, transparent 1px);
  background-size: 14px 14px;
  opacity: 0.5;
  pointer-events: none;
}
.demo__bar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 2px 10px;
}
.demo__bar i { width: 7px; height: 7px; border-radius: 50%; background: #33465e; display: block; }
.demo__bar i:nth-child(1) { background: #f87171; }
.demo__bar i:nth-child(2) { background: #fbbf24; }
.demo__bar i:nth-child(3) { background: #34d399; }
.demo__url {
  margin-left: 8px;
  padding: 2px 9px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.06);
  color: #7f94ad;
  font-family: var(--mono);
  font-size: 0.62rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mock {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 8px;
  padding: 10px;
  border: 1px solid rgba(148, 178, 214, 0.16);
  border-bottom: 0;
  border-radius: 10px 10px 0 0;
  background: rgba(9, 18, 32, 0.72);
  aspect-ratio: 16 / 10;
  overflow: hidden;
}
.mock__side { display: grid; gap: 5px; align-content: start; }
.mock__side i { display: block; height: 5px; border-radius: 3px; background: rgba(148, 178, 214, 0.22); }
.mock__side i:first-child { height: 16px; background: rgba(125, 211, 252, 0.35); border-radius: 6px; }
.mock__body { display: flex; flex-direction: column; gap: 8px; justify-content: space-between; min-height: 0; }
.mock__row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.mock__box {
  padding: 7px 8px;
  border: 1px solid rgba(148, 178, 214, 0.15);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.03);
}
.mock__box em {
  display: block;
  height: 4px; width: 60%;
  margin-bottom: 5px;
  border-radius: 2px;
  background: rgba(148, 178, 214, 0.3);
}
.mock__box b {
  display: block;
  height: 8px; width: 40%;
  border-radius: 2px;
  background: rgba(125, 211, 252, 0.72);
}
.mock__chart {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 96px;
  min-height: 46px;
  flex: 0 0 auto;
  padding: 8px;
  border: 1px solid rgba(148, 178, 214, 0.15);
  border-radius: 7px;
  background:
    repeating-linear-gradient(0deg, rgba(148, 178, 214, 0.07) 0 1px, transparent 1px 18px),
    rgba(255, 255, 255, 0.02);
}.mock__chart i {
  flex: 1 1 0;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(180deg, rgba(125, 211, 252, 0.78), rgba(22, 104, 227, 0.22));
}
.mock__fan {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 7px 9px;
  border: 1px solid rgba(148, 178, 214, 0.15);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.02);
}
.mock__fan span { width: 26%; height: 4px; border-radius: 2px; background: rgba(148, 178, 214, 0.3); }
.mock__fan i {
  width: 12px; height: 12px;
  border-radius: 50%;
  border: 2px solid rgba(52, 211, 153, 0.8);
  border-top-color: transparent;
}
.demo--hmi .mock {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 8px;
  border-radius: 12px;
  padding: 12px;
  aspect-ratio: 16 / 10;
  background: #06101d;
}
.hmi-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; }
.hmi-tile {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 3px;
  padding: 10px 6px;
  border: 1px solid rgba(125, 211, 252, 0.22);
  border-radius: 8px;
  background: rgba(22, 104, 227, 0.1);
}
.hmi-tile b { color: #8fd7ff; font-size: 0.95rem; font-variant-numeric: tabular-nums; line-height: 1.2; }
.hmi-tile span { color: #5b7b9b; font-size: 0.62rem; line-height: 1.2; }
.hmi-fan-row { display: flex; gap: 5px; justify-content: center; margin-top: 2px; }
.hmi-fan-row i {
  width: 18px; height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(52, 211, 153, 0.75);
  border-top-color: transparent;
  animation: spin 2.4s linear infinite;
}
.hmi-fan-row i:nth-child(2) { animation-duration: 3.1s; border-color: rgba(125, 211, 252, 0.7); border-top-color: transparent; }
.hmi-fan-row i:nth-child(3) { animation-duration: 3.8s; border-color: rgba(148, 178, 214, 0.45); border-top-color: transparent; }

.demo__body { display: flex; flex-direction: column; flex: 1; gap: 10px; padding: 18px; }
.demo__eyebrow { color: var(--faint); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.demo__body h3 { font-size: 1.0625rem; }
.demo__body p { color: var(--muted); font-size: 0.86rem; line-height: 1.65; flex: 1; }
.demo__meta { display: flex; flex-wrap: wrap; gap: 6px; }
.demo__actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }

/* ==========================================================================
   CTA
   ========================================================================== */
.cta {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 52px);
  border-radius: var(--r-lg);
  background:
    radial-gradient(600px 260px at 88% -10%, rgba(6, 182, 212, 0.38), transparent 60%),
    linear-gradient(135deg, #0b1c33, #103a6b 70%, #0d2848);
  color: #c3d3e6;
  box-shadow: var(--shadow-3);
}
.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 178, 214, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 178, 214, 0.08) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(90deg, #000, transparent 70%);
  -webkit-mask-image: linear-gradient(90deg, #000, transparent 70%);
  pointer-events: none;
}
.cta > * { position: relative; z-index: 1; }
.cta h2 { margin-bottom: 10px; color: #fff; font-size: clamp(1.16rem, 3.4vw, 1.9rem); }
.cta p { max-width: 60ch; color: #a7b9cf; font-size: 0.95rem; }
.cta .btn-row { margin-top: 22px; }
.cta__grid { display: grid; gap: 24px; }
@media (min-width: 900px) { .cta__grid { grid-template-columns: 1fr auto; align-items: center; } }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  margin-top: clamp(40px, 6vw, 72px);
  padding: 44px 0 24px;
  background: #111827;
  color: #9ca3af;
}
.site-footer__grid { display: grid; gap: 26px; }
@media (min-width: 640px) { .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 980px) { .site-footer__grid { grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 32px; } }
.site-footer h4 { margin-bottom: 12px; color: #fff; font-size: 1rem; }
.site-footer p { color: #9ca3af; font-size: 0.875rem; }
.site-footer ul { display: grid; gap: 8px; }
.site-footer li a { color: #9ca3af; font-size: 0.875rem; transition: color 0.18s; }
.site-footer li a:hover { color: #fff; }
.site-footer .contact-line { display: flex; align-items: center; gap: 8px; }
.site-footer .contact-line .ic { width: 15px; height: 15px; flex: none; opacity: 0.8; }
.site-footer__bottom {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid #1f2937;
  color: #6b7280;
  font-size: 0.8rem;
  text-align: center;
}
.site-footer__bottom a { color: #9ca3af; }
.site-footer__bottom a:hover { color: #fff; }

/* ==========================================================================
   电抗器科普（单线示意 / 波形对比）
   ========================================================================== */
.rx-board {
  position: relative;
  overflow: hidden;
  padding: clamp(16px, 2.6vw, 26px);
  border-radius: var(--r-lg);
  background: linear-gradient(155deg, #10233f, #0a1424 60%, #0c1a2e);
  box-shadow: 0 26px 56px -34px rgba(8, 20, 38, 0.95);
  color: #b9cadd;
}
.rx-board::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(125, 211, 252, 0.13) 1px, transparent 1px);
  background-size: 16px 16px;
  opacity: 0.4;
  pointer-events: none;
}
.rx-board > * { position: relative; z-index: 1; }
.rx-board__head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #6f8aa6;
}
.rx-board__head .rx-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.16);
  flex: none;
}
.rx-board__head em {
  margin-left: auto;
  font-style: normal;
  font-size: 0.68rem;
  letter-spacing: 0;
  text-transform: none;
  color: #526a85;
  text-align: right;
}

.rx-flow { display: flex; flex-direction: column; margin-top: 18px; }
.rx-stage {
  position: relative;
  display: grid;
  gap: 2px;
  padding: 11px 12px 10px;
  border: 1px solid rgba(148, 178, 214, 0.2);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.035);
  min-width: 0;
}
.rx-stage b { color: #e8f1fb; font-size: 0.81rem; line-height: 1.32; }
.rx-stage > span { color: #7f94ad; font-size: 0.67rem; line-height: 1.45; }
.rx-stage__ico { display: flex; align-items: center; gap: 4px; margin-bottom: 5px; color: #7dd3fc; }
.rx-stage__ico .ic { width: 14px; height: 14px; }
.rx-stage--vfd { border-color: rgba(125, 211, 252, 0.42); background: rgba(22, 104, 227, 0.2); }
.rx-stage--vfd b { color: #cfe9ff; }
.rx-stage--key { border-color: rgba(251, 191, 36, 0.45); background: rgba(251, 191, 36, 0.08); }
.rx-stage--key b { color: #fcd34d; }
.rx-stage--key > span { color: #b99a5c; }
.rx-stage--key .rx-stage__ico { color: #fbbf24; }
/* 接法 B：每台变频器前后各 1 只电抗器——强调，但不作警示（琥珀色留给"不建议"的接法 C） */
.rx-stage--rx { border-color: rgba(125, 211, 252, 0.32); background: rgba(125, 211, 252, 0.075); }
.rx-stage--rx b { color: #c3e6fb; }
.rx-stage--rx > span { color: #86a7c4; }
.rx-stage--rx .rx-stage__ico { color: #7dd3fc; }
.rx-badge {
  position: absolute;
  top: -9px;
  right: 8px;
  padding: 1px 6px;
  border-radius: 999px;
  background: #fbbf24;
  color: #422006;
  font-size: 0.56rem;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.rx-badge--rx { background: #7dd3fc; color: #062638; }
.rx-branch { margin-bottom: 5px; }
.rx-branch svg { width: 100%; max-width: 158px; height: auto; }

.rx-arrow { position: relative; flex: none; display: grid; place-items: center; height: 20px; }
.rx-arrow::before {
  content: "";
  width: 2px;
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(125, 211, 252, 0.18), rgba(125, 211, 252, 0.72));
}
.rx-arrow::after {
  content: "";
  position: absolute;
  bottom: 1px;
  left: 50%;
  width: 7px;
  height: 7px;
  border-right: 1.6px solid rgba(125, 211, 252, 0.95);
  border-bottom: 1.6px solid rgba(125, 211, 252, 0.95);
  transform: translateX(-50%) rotate(45deg);
}

@media (min-width: 980px) {
  .rx-flow { flex-direction: row; align-items: stretch; }
  .rx-stage { flex: 1 1 0; }
  .rx-arrow { width: 24px; height: auto; }
  .rx-arrow::before { width: 100%; height: 2px; background: linear-gradient(90deg, rgba(125, 211, 252, 0.18), rgba(125, 211, 252, 0.72)); }
  .rx-arrow::after { bottom: auto; top: 50%; left: auto; right: 1px; transform: translateY(-50%) rotate(-45deg); }
}

.rx-legend {
  display: grid;
  gap: 10px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed rgba(148, 178, 214, 0.18);
  font-size: 0.76rem;
  line-height: 1.65;
  color: #8ea4bb;
}
.rx-legend b { font-weight: 650; }
.rx-legend__in b { color: #fcd34d; }
.rx-legend__out b { color: #7dd3fc; }
@media (min-width: 760px) {
  .rx-legend { grid-template-columns: 1fr 1fr; gap: 20px; }
}

/* 波形小图 */
.rx-viz {
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  padding: 8px 10px;
  border: 1px solid rgba(148, 178, 214, 0.14);
  border-radius: 10px;
  background: #0b1526;
}
.rx-viz svg { width: 100%; height: auto; }
.rx-card h3 { display: flex; align-items: baseline; gap: 8px; }
.rx-no {
  flex: none;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--brand);
  opacity: 0.7;
}
.rx-sub { margin: 38px 0 18px; max-width: 780px; }
.rx-sub h3 { font-size: clamp(1.02rem, 2.4vw, 1.42rem); margin-bottom: 8px; }
.rx-sub p { color: var(--muted); font-size: 0.93rem; }
.rx-sub:first-of-type { margin-top: 0; }
.rx-jump {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 14px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--brand);
}
.rx-jump .ic { width: 14px; height: 14px; transition: transform 0.2s; }
.rx-jump:hover .ic { transform: translateX(3px); }
.tbl-swipe { display: inline; }
@media (min-width: 760px) { .tbl-swipe { display: none; } }
.rx-br { display: inline; }
.note strong { color: inherit; font-weight: 700; }

/* ==========================================================================
   动效
   ========================================================================== */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
html.js [data-reveal].is-in { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: 0.08s; }
[data-reveal][data-delay="2"] { transition-delay: 0.16s; }
[data-reveal][data-delay="3"] { transition-delay: 0.24s; }

.ic { width: 1.15em; height: 1.15em; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.ic--fill { fill: currentColor; stroke: none; }

/* 锚点跳转时避开固定导航 */
[id] { scroll-margin-top: calc(var(--nav-h) + 64px); }

/* 降级 */
@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; }
  [data-reveal] { opacity: 1; transform: none; }
}

/* 小屏细节 */
@media (max-width: 400px) {
  .brand { font-size: 0.98rem; }
  .brand img { width: 26px; height: 26px; }
  .btn { padding: 11px 16px; font-size: 0.9rem; }
}

/* 手机上二级导航会占两行，锚点跳转要躲开更高的吸附条 */
@media (max-width: 767px) {
  [id] { scroll-margin-top: calc(var(--nav-h) + 96px); }
}

/* ==========================================================================
   接线示意页（wiring.html）：三种接法 + 风机转动动效
   ========================================================================== */
.wire-board { margin-top: 16px; }
.wire-board.is-warn {
  box-shadow: 0 0 0 1px rgba(251, 191, 36, 0.34), 0 26px 56px -34px rgba(8, 20, 38, 0.95);
}
.wire-board .rx-dot--warn { background: #fbbf24; box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.16); }
.wire-board.is-warn .rx-board__head em { color: #c79a3e; }

/* 并联母线：5 列栅格的 10%/30%/50%/70%/90% 正好落在各列中心，与挂线自动对齐 */
.fan-rack {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  margin-top: 26px;
  padding-top: 24px;
}
.fan-rack::before {
  content: "";
  position: absolute;
  top: 10px; left: 10%; right: 10%;
  height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, rgba(125, 211, 252, 0.22), rgba(125, 211, 252, 0.62), rgba(125, 211, 252, 0.22));
}
.fan-tile {
  position: relative;
  display: grid;
  justify-items: center;
  align-content: start;
  gap: 5px;
  min-width: 0;
}
/* 母线到风机的挂线 */
.fan-tile::before {
  content: "";
  position: absolute;
  top: -14px; left: 50%;
  width: 2px; height: 14px;
  transform: translateX(-50%);
  background: rgba(125, 211, 252, 0.5);
}
.fan-dev {
  padding: 1px 6px;
  border: 1px solid rgba(148, 178, 214, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: #a9c9e6;
  font-size: 0.58rem;
  line-height: 1.5;
  white-space: nowrap;
}
.fan { display: block; width: 100%; max-width: 64px; height: auto; }
.fan__ring { fill: rgba(255, 255, 255, 0.03); stroke: rgba(148, 178, 214, 0.3); stroke-width: 1.5; }
.fan__hub { fill: #7dd3fc; }
.fan__rotor {
  transform-box: view-box;
  transform-origin: 32px 32px;
  animation: fanSpin var(--t, 1.5s) linear infinite;
}
@keyframes fanSpin { to { transform: rotate(360deg); } }
.fan-tag { color: #7f94ad; font-size: 0.6rem; font-variant-numeric: tabular-nums; }
@media (min-width: 720px) {
  .fan-rack { gap: 10px; }
  .fan { max-width: 72px; }
  .fan-dev { font-size: 0.62rem; }
}
@media (min-width: 980px) {
  .fan { max-width: 84px; }
  .fan-tag { font-size: 0.66rem; }
}
.is-frozen .fan__rotor { animation-play-state: paused; }
/* 命中"减少动态效果"时默认静止；点「继续转动」后仍按原速转（需盖掉全站那条 0.001ms 的降级规则） */
@media (prefers-reduced-motion: reduce) {
  body:not(.is-live) .fan__rotor { animation: none !important; }
  body.is-live .fan__rotor {
    animation-duration: var(--t, 1.5s) !important;
    animation-iteration-count: infinite !important;
  }
}

.wire-note {
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px dashed rgba(148, 178, 214, 0.18);
  color: #8ba2ba;
  font-size: 0.78rem;
  line-height: 1.7;
}
.sec-head__act { margin-top: 16px; }

/* 接线面板：桌面端阶段盒不无限拉宽，三段的 A / B 面板居中，五段的 C 面板自然铺满 */
@media (min-width: 980px) {
  .wire-board .rx-flow { justify-content: center; }
  .wire-board .rx-stage { flex: 0 1 250px; }
  .wire-board .rx-stage b { font-size: 0.85rem; }
}
/* 窄屏：面板标题与右侧备注分两行，长标题不再被挤成锯齿 */
@media (max-width: 600px) {
  .wire-board .rx-board__head { flex-wrap: wrap; row-gap: 3px; }
  .wire-board .rx-board__head em { flex: 1 1 100%; margin-left: 14px; text-align: left; }
}