/* ==========================================================================
   米奥机器人 MIOROBOT — 官网样式
   设计语言：科技 / 高端 / 简约 · 品牌天青蓝 + 深墨蓝 + 紫蓝渐变
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --ink-900: #061733;
  --ink-800: #0b2a5b;
  --ink-700: #173a72;
  --ink-600: #2b4c80;
  --ink-400: #5a739b;
  --ink-300: #8296b3;
  --line: rgba(11, 42, 91, .10);
  --line-soft: rgba(11, 42, 91, .06);

  --mint-400: #9ee6dd;
  --mint-500: #7ed9cf;
  --mint-600: #4ec2b6;
  --mint-700: #2ea79b;

  --violet: #7a3fd0;
  --rose: #c0246e;
  --brand-grad: linear-gradient(112deg, #c0246e 0%, #7a3fd0 42%, #2b4c80 78%, #0b2a5b 100%);
  --mint-grad: linear-gradient(135deg, #7ed9cf 0%, #4ec2b6 100%);

  --bg: #ffffff;
  --bg-soft: #f5f8fc;
  --bg-mist: #eef4fa;
  --surface: #ffffff;
  --glass: rgba(255, 255, 255, .72);

  --shadow-xs: 0 1px 2px rgba(6, 23, 51, .05);
  --shadow-sm: 0 6px 18px -10px rgba(6, 23, 51, .18);
  --shadow-md: 0 18px 40px -22px rgba(6, 23, 51, .28);
  --shadow-lg: 0 40px 90px -50px rgba(6, 23, 51, .45);
  --shadow-mint: 0 26px 60px -30px rgba(78, 194, 182, .55);

  --r-xs: 8px;
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 26px;
  --r-xl: 34px;
  --r-pill: 999px;

  --shell: 1220px;
  --pad: clamp(20px, 5vw, 48px);
  --sec-y: clamp(72px, 9vw, 138px);

  --font-cn: "Noto Sans SC", "Source Han Sans SC", "思源黑体", "HarmonyOS Sans SC",
             "Microsoft YaHei UI", "微软雅黑", system-ui, sans-serif;
  --font-head: "Source Han Sans Bold", "Noto Sans SC", "思源黑体", "HarmonyOS Sans SC",
               "Microsoft YaHei UI", "微软雅黑", system-ui, sans-serif;
  --font-cn-heavy: "思源黑体 Heavy", "Noto Sans SC Black", "Source Han Sans Bold",
                   "HarmonyOS Sans SC Black", "Microsoft YaHei UI", sans-serif;
  --font-en: "DIN", "Poppins", "Bahnschrift", "Segoe UI", Arial, sans-serif;

  --ease: cubic-bezier(.22, .68, .24, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-600);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
ul, ol { list-style: none; }
table { border-collapse: collapse; width: 100%; }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--ink-900);
  line-height: 1.22;
  letter-spacing: -.01em;
  font-weight: 700;
}

::selection { background: rgba(126, 217, 207, .45); color: var(--ink-900); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* ---------- 通用：渐变文字 ---------- */
.grad-text {
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: var(--ink-800);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: var(--r-pill);
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease),
              background-color .35s var(--ease), color .35s var(--ease);
  will-change: transform;
}
.btn .ico { width: 17px; height: 17px; flex: none; transition: transform .35s var(--ease); }
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn:hover .ico { transform: translateX(3px); }

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, #122f63 0%, #1d4b8f 55%, #2ea79b 130%);
  box-shadow: 0 14px 30px -16px rgba(11, 42, 91, .7);
}
.btn-primary:hover { box-shadow: 0 20px 40px -18px rgba(11, 42, 91, .75); }

.btn-ghost {
  color: var(--ink-800);
  background: rgba(255, 255, 255, .7);
  border: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover { border-color: rgba(11, 42, 91, .28); background: #fff; }

.btn-sm { padding: 10px 18px; font-size: 14px; }
.btn-block { width: 100%; }

/* ==========================================================================
   顶部
   ========================================================================== */
.scroll-progress {
  position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 90;
  background: transparent; pointer-events: none;
}
.scroll-progress span {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--mint-600), var(--violet), var(--rose));
}

.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 80;
  transition: background-color .4s var(--ease), box-shadow .4s var(--ease),
              backdrop-filter .4s var(--ease);
}
.site-header::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
  opacity: 0; transition: opacity .4s var(--ease);
}
.site-header.is-stuck {
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(160%) blur(18px);
  box-shadow: 0 10px 30px -26px rgba(6, 23, 51, .55);
}
.site-header.is-stuck::after { opacity: 1; }

.header-inner {
  display: flex; align-items: center; gap: clamp(16px, 3vw, 40px);
  height: 72px;
}

.brand { display: inline-flex; align-items: center; gap: 11px; flex: none; }
/* 官方组合标识（图形 + 米奥机器人 + MIOROBOT），按高度等比缩放 */
.brand-logo { height: 34px; width: auto; display: block; }

.nav { display: flex; align-items: center; gap: clamp(14px, 2.2vw, 30px); margin-left: auto; }
.nav a {
  position: relative; font-size: 15px; color: var(--ink-600);
  padding: 6px 2px; transition: color .3s var(--ease);
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0; height: 2px;
  border-radius: 2px; background: var(--mint-grad);
  transition: right .35s var(--ease);
}
.nav a:hover, .nav a.is-current { color: var(--ink-900); }
.nav a:hover::after, .nav a.is-current::after { right: 0; }

.header-actions { display: flex; align-items: center; gap: 12px; flex: none; }

/* ------------------------------------------- 产品版本切换（标准版 / 运营版） */
.ver-tabs {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin: 26px 0 4px; padding: 6px;
  border: 1px solid var(--line); border-radius: 999px;
  background: rgba(255, 255, 255, .72); width: fit-content;
  box-shadow: 0 12px 30px -26px rgba(6, 23, 51, .5);
}
.ver-tab {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 26px; border: 0; border-radius: 999px; cursor: pointer;
  font-family: inherit; font-size: 15px; font-weight: 700; color: var(--ink-600);
  background: transparent; transition: all .3s var(--ease);
}
.ver-tab:hover { color: var(--ink-900); background: rgba(126, 217, 207, .14); }
.ver-tab.is-active {
  color: #fff; background: var(--brand-grad);
  box-shadow: 0 12px 26px -14px rgba(11, 42, 91, .6);
}
.ver-tab small {
  font-family: var(--font-en); font-size: 12px; letter-spacing: .12em;
  text-transform: uppercase; opacity: .6;
}
.ver-tab.is-active small { opacity: .82; }

/* 版本面板：只显示当前版本 */
.ver-panel[hidden] { display: none; }
.ver-intro { max-width: 64ch; margin-top: 22px; }
.ver-intro p { font-size: 15.5px; color: var(--ink-400); }
.ver-intro p + p { margin-top: 10px; }
.ver-intro b { color: var(--mint-700); }

/* 运营版落地案例 */
.case-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px; margin-top: clamp(26px, 3vw, 40px);
}
.case-card {
  display: flex; flex-direction: column; gap: 12px;
  padding: 24px 24px 26px;
  border: 1px solid var(--line); border-radius: var(--r-lg);
  background: #fff; box-shadow: var(--shadow-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.case-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 11px; border-radius: 999px;
  font-size: 13px; font-weight: 700; color: var(--mint-700);
  background: rgba(126, 217, 207, .16);
}
.case-badge i {
  width: 6px; height: 6px; border-radius: 50%; background: var(--mint-500);
  box-shadow: 0 0 0 3px rgba(126, 217, 207, .25);
}
.case-city {
  font-family: var(--font-en); font-size: 13px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-300);
}
.case-card b { font-size: 17px; color: var(--ink-900); }
.case-card p { font-size: 14px; color: var(--ink-400); }
/* 现场照片位（有图后把 img 放进来即可） */
.case-photo {
  width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
  border-radius: var(--r-md); margin-bottom: 2px;
}

.header-actions { display: flex; align-items: center; gap: 12px; flex: none; }
.hotline {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-en); font-size: 15px; font-weight: 700;
  letter-spacing: .04em; color: var(--ink-800);
  padding: 8px 14px; border-radius: var(--r-pill);
  border: 1px solid var(--line); background: rgba(255, 255, 255, .6);
  transition: border-color .3s var(--ease), color .3s var(--ease);
}
.hotline .ico { width: 15px; height: 15px; color: var(--mint-700); }
.hotline:hover { border-color: var(--mint-500); color: var(--ink-900); }

.burger { display: none; width: 42px; height: 42px; border-radius: 12px; position: relative; }
.burger span {
  position: absolute; left: 11px; right: 11px; height: 2px; border-radius: 2px;
  background: var(--ink-800); transition: transform .35s var(--ease), opacity .3s var(--ease);
}
.burger span:nth-child(1) { top: 14px; }
.burger span:nth-child(2) { top: 20px; }
.burger span:nth-child(3) { top: 26px; }
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ==========================================================================
   首屏
   ========================================================================== */
.hero {
  position: relative;
  /* 顶部留出固定页头的高度（72px）再叠呼吸空间 */
  padding-top: clamp(122px, 15vh, 178px);
  background:
    radial-gradient(120% 80% at 88% 6%, rgba(126, 217, 207, .30) 0%, transparent 58%),
    radial-gradient(90% 70% at 6% 92%, rgba(122, 63, 208, .12) 0%, transparent 60%),
    linear-gradient(180deg, #fbfdff 0%, #f2f7fd 46%, #ffffff 100%);
  overflow: hidden;
}

.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.orb { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .5; }
.orb-1 { width: 460px; height: 460px; right: -80px; top: -60px; background: rgba(126, 217, 207, .55); }
.orb-2 { width: 320px; height: 320px; left: -90px; top: 34%; background: rgba(122, 63, 208, .22); }
.orb-3 { width: 380px; height: 380px; left: 44%; bottom: -160px; background: rgba(43, 76, 128, .14); }

.grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(11, 42, 91, .045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(11, 42, 91, .045) 1px, transparent 1px);
  background-size: 74px 74px;
  mask-image: radial-gradient(90% 70% at 60% 30%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(90% 70% at 60% 30%, #000 20%, transparent 78%);
}

.hero-ring {
  position: absolute; right: -6%; top: 12%;
  width: min(760px, 74vw); aspect-ratio: 1; border-radius: 50%;
  border: 1px solid rgba(11, 42, 91, .09);
}
.hero-ring::after {
  content: ""; position: absolute; inset: 9%; border-radius: 50%;
  border: 1px dashed rgba(11, 42, 91, .07);
}
.ring-2 { right: 4%; top: 26%; width: min(520px, 52vw); border-color: rgba(78, 194, 182, .18); }

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(0, .97fr);
  align-items: center;
  gap: clamp(28px, 5vw, 64px);
  padding-bottom: clamp(40px, 5vw, 72px);
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 13.5px; letter-spacing: .16em; font-weight: 700;
  color: var(--ink-800); text-transform: uppercase;
  padding: 7px 16px; border-radius: var(--r-pill);
  background: rgba(255, 255, 255, .8);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-xs);
}
.eyebrow i {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--mint-600); box-shadow: 0 0 0 4px rgba(78, 194, 182, .18);
}

.hero-title {
  margin: 22px 0 18px;
  font-family: var(--font-cn-heavy);
  font-size: clamp(42px, 6.6vw, 80px);
  line-height: 1.05;
  letter-spacing: -.02em;
}
.hero-title .line { display: block; }
.hero-title .line:first-child { color: var(--ink-900); }
.hero-title .line:last-child { margin-top: 2px; }

.hero-sub {
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--ink-700); font-weight: 500;
  letter-spacing: .01em;
}
.hero-lead {
  margin-top: 18px; max-width: 46ch;
  font-size: 15.5px; color: var(--ink-400);
}
.hero-lead .hl { color: var(--ink-800); font-weight: 700; }
.hero-lead b { color: var(--mint-700); font-family: var(--font-en); font-size: 1.08em; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.hero-tags {
  display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 30px;
  font-size: 13.5px; color: var(--ink-400);
}
.hero-tags li { display: inline-flex; align-items: center; gap: 8px; }
.hero-tags li::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%;
  background: var(--mint-600);
}

.hero-visual { position: relative; display: grid; place-items: center; }
.hero-glow {
  position: absolute; width: 78%; aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(circle, rgba(126, 217, 207, .45) 0%, rgba(126, 217, 207, 0) 68%);
  filter: blur(12px);
}
.hero-robot {
  position: relative;
  width: min(520px, 92%);
  filter: drop-shadow(0 46px 70px rgba(6, 23, 51, .28));
  animation: floaty 7s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(-8px); }
  50% { transform: translateY(10px); }
}

.float-card {
  position: absolute; display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; border-radius: var(--r-md);
  background: var(--glass); border: 1px solid rgba(255, 255, 255, .9);
  box-shadow: var(--shadow-md); backdrop-filter: blur(14px);
  animation: floaty 6s ease-in-out infinite;
}
.float-card b {
  display: block; font-family: var(--font-en); font-size: 18px;
  color: var(--ink-900); line-height: 1.2;
}
.float-card small { font-size: 12.5px; color: var(--ink-400); letter-spacing: .02em; }
.float-card .dot {
  width: 9px; height: 9px; border-radius: 50%; background: var(--violet);
  box-shadow: 0 0 0 4px rgba(122, 63, 208, .14);
}
.dot-mint { background: var(--mint-600); box-shadow: 0 0 0 4px rgba(78, 194, 182, .16); }
.dot-ink { background: var(--ink-800); box-shadow: 0 0 0 4px rgba(11, 42, 91, .12); }
.card-a { left: 2%; top: 16%; animation-delay: .6s; }
.card-b { right: 0; top: 44%; animation-delay: 1.4s; }
.card-c { left: 8%; bottom: 12%; animation-delay: 2.1s; }

.hero-stats {
  position: relative;
  border-top: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, .58);
  backdrop-filter: blur(8px);
}
.stats-inner {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 12px; padding-block: clamp(18px, 2.4vw, 30px);
}
.stat { display: flex; flex-direction: column; gap: 2px; padding-left: 18px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: 0; padding-left: 0; }
.stat b {
  font-family: var(--font-en); font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 700; color: var(--ink-900); letter-spacing: -.01em; line-height: 1.15;
}
.stat span { font-size: 14px; color: var(--ink-400); }

/* ==========================================================================
   版块通用
   ========================================================================== */
.section { position: relative; padding-block: var(--sec-y); scroll-margin-top: 94px; }
.hero { scroll-margin-top: 0; }
.advantage { background: #fff; }
.features { background: var(--bg-soft); }
.product { background: linear-gradient(180deg, #fff 0%, #f4f8fd 100%); }
.scene { background: #fff; }
.specs { background: var(--bg-soft); }
.about { background: #fff; }

.sec-head { max-width: 760px; margin-bottom: clamp(34px, 4.4vw, 60px); }
.sec-head.center { margin-inline: auto; text-align: center; }
.sec-head.light .sec-title { color: #fff; }
.sec-head.light .sec-label { color: rgba(255, 255, 255, .72); }

.sec-label {
  display: inline-block; margin-bottom: 14px;
  font-family: var(--font-en); font-size: 13.5px; font-weight: 700;
  letter-spacing: .24em; text-transform: uppercase; color: var(--mint-700);
}

.sec-title {
  font-family: var(--font-cn-heavy);
  font-size: clamp(30px, 4.2vw, 50px);
  line-height: 1.18; letter-spacing: -.015em;
}
.sec-title .num {
  font-family: var(--font-en);
  font-size: 1.22em; line-height: .9;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  margin-right: 6px;
}
.sec-title em {
  display: block; margin-top: 12px;
  font-family: var(--font-cn); font-style: normal;
  font-size: clamp(14px, 1.5vw, 16px); font-weight: 400;
  color: var(--ink-400); letter-spacing: .01em;
}

/* ==========================================================================
   核心优势
   ========================================================================== */
.adv-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 26px);
}
.adv-card {
  position: relative; padding: clamp(30px, 3.2vw, 42px) clamp(26px, 3vw, 40px) clamp(26px, 3vw, 36px);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform .5s var(--ease), box-shadow .5s var(--ease), border-color .5s var(--ease);
}
.adv-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: var(--mint-grad); transform: scaleX(0); transform-origin: left;
  transition: transform .55s var(--ease);
}
.adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(78, 194, 182, .4); }
.adv-card:hover::before { transform: scaleX(1); }

.adv-ico {
  width: 58px; height: 58px; border-radius: 16px;
  display: grid; place-items: center; margin-bottom: 22px;
  color: var(--ink-800);
  background: linear-gradient(140deg, rgba(126, 217, 207, .22), rgba(122, 63, 208, .10));
}
.adv-ico svg { width: 30px; height: 30px; }

.adv-card h3 { font-size: 19px; margin-bottom: 12px; }
.adv-card p { font-size: 15px; color: var(--ink-400); }
.adv-idx {
  position: absolute; right: 20px; top: 10px;
  font-family: var(--font-en); font-size: 54px; font-weight: 700; line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(11, 42, 91, .16);
  letter-spacing: -.03em;
  pointer-events: none;
}

.quote-band {
  margin-top: clamp(34px, 4vw, 56px);
  padding: clamp(28px, 3.4vw, 44px) clamp(24px, 4vw, 60px);
  border-radius: var(--r-lg);
  background:
    radial-gradient(100% 160% at 100% 0%, rgba(126, 217, 207, .22) 0%, transparent 62%),
    linear-gradient(120deg, #f7fbff 0%, #eef5fc 100%);
  border: 1px solid var(--line-soft);
  text-align: center;
}
.quote-band p {
  font-family: var(--font-cn-heavy);
  font-size: clamp(22px, 3vw, 36px);
  letter-spacing: .02em;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.quote-band span {
  display: block; margin-top: 10px; font-size: 13.5px;
  letter-spacing: .3em; color: var(--ink-300); text-transform: uppercase;
}

/* ==========================================================================
   核心功能
   ========================================================================== */
.feat-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 22px);
}
.feat {
  display: flex; gap: 16px; align-items: flex-start;
  padding: clamp(20px, 2.4vw, 28px);
  border-radius: var(--r-md);
  background: #fff; border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-xs);
  transition: transform .45s var(--ease), box-shadow .45s var(--ease), border-color .45s var(--ease);
}
.feat:hover {
  transform: translateY(-4px);
  border-color: rgba(78, 194, 182, .42);
  box-shadow: var(--shadow-sm);
}
.feat-ico {
  flex: none; width: 44px; height: 44px; border-radius: 13px;
  display: grid; place-items: center; color: var(--mint-700);
  background: rgba(126, 217, 207, .16);
  transition: background-color .45s var(--ease), color .45s var(--ease);
}
.feat-ico svg { width: 24px; height: 24px; }
.feat:hover .feat-ico { background: var(--ink-800); color: #fff; }
.feat h3 { font-size: 16.5px; margin-bottom: 5px; }
.feat p { font-size: 14px; color: var(--ink-400); line-height: 1.7; }

/* ==========================================================================
   产品
   ========================================================================== */
.prod-stage {
  display: grid; grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  gap: clamp(28px, 4vw, 70px); align-items: center;
}
.prod-visual {
  position: relative; display: grid; place-items: center;
  min-height: 460px; padding-block: 12px;
}
.prod-visual::before {
  content: ""; position: absolute; inset: 8% 6%; border-radius: 50%;
  border: 1px solid rgba(11, 42, 91, .07);
}
.prod-halo {
  position: absolute; width: 82%; aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(circle, rgba(126, 217, 207, .34) 0%, rgba(126, 217, 207, 0) 66%);
  filter: blur(16px);
  transition: background .6s var(--ease);
}
.prod-visual img {
  position: relative; width: auto; max-width: 92%;
  min-width: min(360px, 64%);
  max-height: min(56vh, 520px);
  filter: drop-shadow(0 30px 48px rgba(6, 23, 51, .24));
  transition: opacity .38s var(--ease), transform .55s var(--ease);
}
.prod-visual img.is-swapping { opacity: 0; transform: translateY(14px) scale(.97); }

.eye-band { display: none; }

.prod-name {
  font-size: clamp(26px, 3vw, 34px);
  display: flex; align-items: baseline; gap: 12px;
}
.prod-name small {
  font-family: var(--font-en); font-size: 14px; font-weight: 700;
  letter-spacing: .18em; color: var(--ink-300); text-transform: uppercase;
}
.prod-desc { margin-top: 14px; font-size: 15.5px; color: var(--ink-400); max-width: 52ch; }

.swatches { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 30px; }
.swatch {
  display: flex; align-items: center; gap: 9px;
  padding: 9px 16px 9px 10px; border-radius: var(--r-pill);
  border: 1px solid var(--line); background: #fff;
  font-size: 13.5px; color: var(--ink-600);
  transition: border-color .35s var(--ease), box-shadow .35s var(--ease), transform .35s var(--ease);
}
.swatch span {
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--sw); box-shadow: inset 0 0 0 1px rgba(6, 23, 51, .12);
}
.swatch em { font-style: normal; }
.swatch:hover { transform: translateY(-2px); border-color: rgba(11, 42, 91, .24); }
.swatch.is-active {
  border-color: var(--mint-600);
  box-shadow: 0 0 0 3px rgba(78, 194, 182, .16);
  color: var(--ink-900); font-weight: 700;
}

.prod-key {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px; margin-bottom: 30px;
  background: var(--line-soft); border: 1px solid var(--line-soft);
  border-radius: var(--r-md); overflow: hidden;
}
.prod-key > div { padding: 16px 18px; background: #fff; }
.prod-key dt { font-size: 13.5px; color: var(--ink-300); margin-bottom: 3px; }
.prod-key dd {
  font-family: var(--font-en); font-size: 18px; font-weight: 700;
  color: var(--ink-900); letter-spacing: .01em;
}
/* 产品区底部按钮组：了解详情 / 京东购买 */
.prod-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ==========================================================================
   场景
   ========================================================================== */
.scene-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 24px);
}
.scene-item {
  position: relative; border-radius: var(--r-md); overflow: hidden;
  background: var(--bg-mist); box-shadow: var(--shadow-sm);
}
.scene-item img {
  width: 100%; aspect-ratio: 2.17 / 1; object-fit: cover;
  transition: transform .8s var(--ease-out);
}
.scene-item:hover img { transform: scale(1.06); }
.scene-item figcaption {
  position: absolute; inset: auto 0 0 0;
  padding: 40px 20px 16px;
  background: linear-gradient(180deg, transparent 0%, rgba(6, 23, 51, .74) 100%);
  color: #fff; display: flex; flex-direction: column; gap: 2px;
}
.scene-item b { font-family: var(--font-head); font-size: 17px; }
.scene-item span { font-size: 13.5px; color: rgba(255, 255, 255, .78); }

.scene-split {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 60px); align-items: center;
  margin-top: clamp(44px, 5.5vw, 80px);
}
.scene-photo {
  border-radius: var(--r-lg); overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: linear-gradient(140deg, #eef5fc, #dbe9f6);
}
.scene-photo img { width: 100%; }
.scene-copy h3 { font-size: clamp(22px, 2.6vw, 32px); margin-bottom: 14px; }
.scene-copy p { font-size: 15.5px; color: var(--ink-400); }
.scene-copy p b { color: var(--mint-700); font-family: var(--font-en); font-size: 1.1em; }

.brand-chips { display: flex; flex-wrap: wrap; gap: 9px; margin: 22px 0 14px; }
.brand-chips li {
  padding: 6px 15px; border-radius: var(--r-pill);
  font-size: 13.5px; color: var(--ink-700);
  background: rgba(126, 217, 207, .16);
  border: 1px solid rgba(78, 194, 182, .22);
}
/* 「等其他车型」：不是具体品牌，用描边弱化 */
.brand-chips li.more {
  color: var(--ink-400);
  background: transparent;
  border-style: dashed;
  border-color: var(--line);
}
.tiny { font-size: 13.5px; color: var(--ink-300); margin-bottom: 22px; }

/* ==========================================================================
   参数
   ========================================================================== */
.spec-layout {
  display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  gap: clamp(20px, 3vw, 40px); align-items: start;
}
.spec-table {
  border-radius: var(--r-lg); overflow: hidden; background: #fff;
  border: 1px solid var(--line-soft); box-shadow: var(--shadow-sm);
}
.spec-table tr { border-bottom: 1px solid var(--line-soft); }
.spec-table tr:last-child { border-bottom: 0; }
.spec-table tr:nth-child(odd) { background: #fbfdff; }
.spec-table th, .spec-table td { padding: 15px clamp(16px, 2vw, 26px); text-align: left; vertical-align: top; }
.spec-table th {
  width: 34%; font-weight: 500; font-size: 14.5px; color: var(--ink-400);
  font-family: var(--font-cn);
}
.spec-table td {
  font-family: var(--font-en); font-weight: 700; font-size: 16px;
  color: var(--ink-900); letter-spacing: .01em;
}

.spec-side { display: grid; gap: clamp(16px, 2vw, 24px); }
.app-card, .cert-card {
  padding: clamp(22px, 2.6vw, 32px);
  border-radius: var(--r-lg); background: #fff;
  border: 1px solid var(--line-soft); box-shadow: var(--shadow-sm);
}
.app-card h3, .cert-card h3 { font-size: 18px; margin-bottom: 8px; }
.app-card p { font-size: 14.5px; color: var(--ink-400); margin-bottom: 16px; }
.app-card img {
  border-radius: var(--r-md); background: var(--bg-mist);
  border: 1px solid var(--line-soft);
}

.cert-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 18px; }
.cert-list li {
  position: relative; padding: 6px 12px 6px 28px; border-radius: var(--r-pill);
  font-size: 14px; color: var(--ink-700);
  background: var(--bg-soft); border: 1px solid var(--line-soft);
}
.cert-list li::before {
  content: ""; position: absolute; left: 12px; top: 50%; width: 6px; height: 6px;
  border-radius: 50%; transform: translateY(-50%);
  background: var(--mint-grad);
}
.cert-img {
  width: min(100%, 280px); margin: 18px auto 0;
  border-radius: var(--r-sm); box-shadow: var(--shadow-sm);
  mask-image: linear-gradient(180deg, #000 82%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, #000 82%, transparent 100%);
}
.app-card img { border-radius: var(--r-md); background: var(--bg-mist); border: 1px solid var(--line-soft); }

/* ==========================================================================
   企业
   ========================================================================== */
.about-grid {
  display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  gap: clamp(24px, 4vw, 58px); align-items: start;
}
.about-main h3 { font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 16px; }
.about-main p { font-size: 15.5px; color: var(--ink-400); margin-bottom: 14px; max-width: 60ch; }

.about-facts {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px; margin-top: 26px;
  background: var(--line-soft); border: 1px solid var(--line-soft);
  border-radius: var(--r-md); overflow: hidden;
}
.about-facts li { padding: 18px 20px; background: #fff; }
.about-facts b {
  display: block; font-family: var(--font-head); font-size: 15.5px;
  color: var(--ink-900); margin-bottom: 2px;
}
.about-facts span { font-size: 14px; color: var(--ink-300); }

.about-side { display: grid; gap: clamp(16px, 2vw, 22px); }
.joint-card { border-radius: var(--r-lg); overflow: hidden; background: #fff; box-shadow: var(--shadow-md); }
.joint-card img { width: 100%; }
.joint-card figcaption { padding: 18px 22px 22px; }
.joint-card b { display: block; font-family: var(--font-head); font-size: 16.5px; color: var(--ink-900); }
.joint-card span { display: block; margin-top: 4px; font-size: 13.5px; color: var(--ink-300); }

.about-company {
  padding: clamp(22px, 2.6vw, 30px);
  border-radius: var(--r-lg);
  background: linear-gradient(130deg, #f7fbff, #edf4fb);
  border: 1px solid var(--line-soft);
}
.about-company h4 { font-size: 17px; margin-bottom: 8px; }
.about-company p { font-size: 14.5px; color: var(--ink-400); }

/* ==========================================================================
   联系
   ========================================================================== */
.contact {
  color: #fff;
  background:
    radial-gradient(80% 100% at 88% 0%, rgba(126, 217, 207, .26) 0%, transparent 58%),
    radial-gradient(70% 90% at 4% 100%, rgba(122, 63, 208, .3) 0%, transparent 58%),
    linear-gradient(150deg, #061b3e 0%, #0b2a5b 52%, #10386f 100%);
  overflow: hidden;
}
.contact::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(80% 70% at 50% 30%, #000 10%, transparent 76%);
  -webkit-mask-image: radial-gradient(80% 70% at 50% 30%, #000 10%, transparent 76%);
  pointer-events: none;
}
.contact .shell { position: relative; }
.contact .sec-title { color: #fff; }
.contact .sec-title em { color: rgba(255, 255, 255, .62); }

.contact-grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: clamp(24px, 3.6vw, 54px); align-items: start;
}
.qr-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(14px, 2vw, 22px); }
.qr-card {
  padding: 14px; border-radius: var(--r-lg);
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .16);
  backdrop-filter: blur(10px);
  transition: transform .45s var(--ease), background-color .45s var(--ease);
}
.qr-card:hover { transform: translateY(-4px); background: rgba(255, 255, 255, .12); }
.qr-card img { width: 100%; border-radius: var(--r-md); background: #fff; padding: 10px; }
.qr-card figcaption {
  display: flex; align-items: center; gap: 8px; margin-top: 12px;
  font-size: 13.5px; color: rgba(255, 255, 255, .86);
}
.qr-card figcaption svg { width: 17px; height: 17px; color: var(--mint-400); flex: none; }

.hotline-block { margin-top: clamp(26px, 3vw, 40px); }
.hotline-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13.5px; letter-spacing: .12em; color: rgba(255, 255, 255, .7);
}
.hotline-label svg { width: 16px; height: 16px; color: var(--mint-400); }
.hotline-num {
  display: block; margin-top: 8px;
  font-family: var(--font-en); font-weight: 700;
  font-size: clamp(38px, 5.6vw, 68px); line-height: 1.05;
  letter-spacing: .01em;
  background: linear-gradient(100deg, #ffffff 0%, #b9f0e8 46%, #9ee6dd 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  transition: opacity .3s var(--ease);
}
.hotline-num:hover { opacity: .82; }
.hotline-note { font-size: 14px; color: rgba(255, 255, 255, .55); margin-top: 6px; }

.contact-form {
  padding: clamp(24px, 3vw, 38px);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .16);
  backdrop-filter: blur(12px);
  box-shadow: 0 40px 90px -60px rgba(0, 0, 0, .8);
}
.contact-form h3 { color: #fff; font-size: 19px; margin-bottom: 22px; }
.field { margin-bottom: 16px; }
.field.two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.field label {
  display: block; margin-bottom: 7px;
  font-size: 13.5px; letter-spacing: .06em; color: rgba(255, 255, 255, .66);
}
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 16px;
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .18);
  color: #fff; font-size: 14.5px;
  transition: border-color .3s var(--ease), background-color .3s var(--ease);
}
.field textarea { resize: vertical; min-height: 84px; }
.field input::placeholder, .field textarea::placeholder { color: rgba(255, 255, 255, .38); }
.field select option { color: var(--ink-900); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--mint-500);
  background: rgba(255, 255, 255, .14);
}
.field.is-error input, .field.is-error textarea { border-color: #ff8098; }

.contact-form .btn-primary {
  margin-top: 6px;
  background: linear-gradient(120deg, #7ed9cf 0%, #4ec2b6 60%, #2ea79b 100%);
  color: #04263f;
  box-shadow: 0 18px 36px -20px rgba(78, 194, 182, .8);
}
.contact-form .btn-primary:hover { box-shadow: 0 24px 46px -20px rgba(78, 194, 182, .9); }
.form-note { margin-top: 14px; font-size: 13.5px; color: rgba(255, 255, 255, .5); }
.form-note.is-ok { color: var(--mint-400); }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  padding-top: clamp(52px, 6vw, 80px);
  background: #fff; color: var(--ink-600);
}
.footer-inner {
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(26px, 4vw, 60px);
  padding-bottom: clamp(30px, 4vw, 48px);
  border-bottom: 1px solid var(--line-soft);
}
.footer-brand { display: flex; gap: 18px; align-items: center; }
/* 页脚只放图形标记：右侧文案已含品牌名，避免重复 */
.footer-logo { height: 44px; width: auto; display: block; flex: none; }
.footer-brand b { display: block; font-family: var(--font-head); font-size: 17px; color: var(--ink-900); }
.footer-brand span { display: block; margin-top: 4px; font-size: 13.5px; color: var(--ink-300); }

.footer-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.footer-nav h4 {
  font-family: var(--font-head); font-size: 13.5px; letter-spacing: .1em;
  color: var(--ink-900); margin-bottom: 12px;
}
.footer-nav a, .footer-nav span { display: block; font-size: 13.5px; color: var(--ink-400); margin-bottom: 8px; transition: color .3s var(--ease); }
.footer-nav a:hover { color: var(--mint-700); }

.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  padding-block: 22px 26px;
  font-size: 12.5px; color: var(--ink-300);
}

.to-top {
  position: fixed; right: clamp(16px, 3vw, 30px); bottom: clamp(16px, 3vw, 30px);
  z-index: 70; width: 46px; height: 46px; border-radius: 50%;
  display: grid; place-items: center; color: var(--ink-800);
  background: rgba(255, 255, 255, .86); border: 1px solid var(--line);
  box-shadow: var(--shadow-md); backdrop-filter: blur(12px);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .4s var(--ease), transform .4s var(--ease), visibility .4s;
}
.to-top svg { width: 20px; height: 20px; }
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { border-color: var(--mint-500); color: var(--mint-700); }

/* ==========================================================================
   滚动入场
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .85s var(--ease-out), transform .85s var(--ease-out);
  transition-delay: calc(var(--d, 0) * 80ms);
  will-change: opacity, transform;
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-robot, .float-card { animation: none; }
  .scroll-progress { display: none; }
}

/* 静态呈现（?static=1）：用于打印、截图与自动化校验 */
.is-static .reveal { opacity: 1; transform: none; transition: none; }
.is-static .hero-robot, .is-static .float-card { animation: none; }
.is-static .scroll-progress { display: none; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .header-inner { height: 66px; }
  .brand-logo { height: 30px; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; margin-bottom: 8px; }
  .hero-robot { width: min(400px, 78%); }
  .hero-copy { max-width: 640px; }
  .adv-grid, .feat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .scene-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .prod-stage, .scene-split, .spec-layout, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .prod-visual { min-height: 340px; order: -1; }
  .about-side { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  /* 移动端：单条导航从页头下方下滑展开 */
  .nav {
    position: fixed; inset: 66px 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    margin: 0; padding: 10px var(--pad) 22px;
    background: rgba(255, 255, 255, .97);
    backdrop-filter: blur(18px);
    box-shadow: 0 24px 40px -30px rgba(6, 23, 51, .6);
    border-bottom: 1px solid var(--line-soft);
    transform: translateY(-14px); opacity: 0; visibility: hidden;
    transition: opacity .35s var(--ease), transform .35s var(--ease), visibility .35s;
  }
  .nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav a { padding: 14px 4px; border-bottom: 1px solid var(--line-soft); font-size: 16px; }
  .nav a::after { display: none; }
  .burger { display: block; }
  .hotline { display: none; }
  .prod-visual::before { display: none; }
  .prod-visual img { min-width: 0; max-width: 100%; max-height: 380px; }
  .stats-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 12px; }
  .stat:nth-child(odd) { border-left: 0; padding-left: 0; }
  .prod-key { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-side { grid-template-columns: 1fr; }
  .about-facts { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cert-img { max-height: 200px; width: auto; }
}

@media (max-width: 560px) {
  .hero { padding-top: 108px; }
  .brand-logo { height: 26px; }
  .footer-logo { height: 34px; }
  .hero-title { font-size: clamp(36px, 11vw, 48px); }
  .hero-cta .btn { flex: 1 1 100%; }
  .adv-grid, .feat-grid, .scene-grid, .qr-row, .field.two,
  .case-grid { grid-template-columns: 1fr; }
  .ver-tabs { width: 100%; border-radius: var(--r-lg); }
  .ver-tab { flex: 1 1 100%; justify-content: center; }
  .float-card { padding: 8px 12px; }
  .float-card b { font-size: 15px; }
  .card-a { left: 0; top: 6%; }
  .card-b { right: 0; top: 40%; }
  .card-c { left: 2%; bottom: 6%; }
  .quote-band { text-align: left; }
  .to-top { width: 42px; height: 42px; }
}