/* ===========================================================
   深圳壹米物联科技有限公司 · 企业官网
   设计语言：简约大气 · 深蓝 + 青绿点缀 · 大量留白
   =========================================================== */

:root {
  --c-bg: #ffffff;
  --c-bg-soft: #f4f7fa;
  --c-bg-dark: #0e1f33;
  --c-bg-dark-2: #13283f;
  --c-ink: #14202e;
  --c-ink-2: #586a7d;
  --c-ink-3: #8a99a8;
  --c-line: #e7ecf2;
  --c-primary: #0f3d6e;
  --c-primary-2: #1e64b4;
  --c-accent: #16b8a6;
  --c-accent-soft: #e6f7f4;
  --shadow-sm: 0 1px 3px rgba(16, 32, 46, .06), 0 1px 2px rgba(16, 32, 46, .04);
  --shadow-md: 0 10px 30px rgba(16, 32, 46, .08);
  --shadow-lg: 0 24px 60px rgba(15, 61, 110, .14);
  --radius: 14px;
  --radius-sm: 10px;
  --maxw: 1200px;
  --nav-h: 68px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui,
    -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .25s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--c-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--c-primary-2); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-accent {
  background: var(--c-accent);
  color: #fff;
}
.btn-accent:hover { filter: brightness(1.06); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, .5);
  color: #fff;
}
.btn-ghost:hover { background: rgba(255, 255, 255, .12); }
.btn-outline {
  background: transparent;
  border-color: var(--c-line);
  color: var(--c-ink);
}
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }

/* ---------------- 导航 ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--c-line);
}
.nav .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .3px;
}
.brand .logo {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 16px;
  box-shadow: var(--shadow-sm);
}
.brand small { display: block; font-size: 11px; font-weight: 500; color: var(--c-ink-3); letter-spacing: 1px; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--c-ink-2);
  font-weight: 500;
  transition: all .2s;
}
.nav-links a:hover { color: var(--c-primary); background: var(--c-bg-soft); }
.nav-links a.active { color: var(--c-primary); background: var(--c-accent-soft); }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--c-ink); margin: 4px 0; transition: .3s; }

/* ---------------- Hero（首页深底） ---------------- */
.hero {
  position: relative;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(22, 184, 166, .20), transparent 60%),
    radial-gradient(900px 500px at 0% 110%, rgba(30, 100, 180, .22), transparent 55%),
    var(--c-bg-dark);
  color: #fff;
  overflow: hidden;
  padding: 0;
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: radial-gradient(900px 480px at 70% 20%, #000 30%, transparent 75%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  padding: 96px 0 104px;
  max-width: 760px;
}
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--c-accent);
  border: 1px solid rgba(22, 184, 166, .35);
  padding: 6px 14px; border-radius: 999px;
  background: rgba(22, 184, 166, .08);
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: .5px;
  margin-bottom: 20px;
}
.hero h1 .hl { color: var(--c-accent); }
.hero p.lead {
  font-size: clamp(16px, 2vw, 19px);
  color: #c2cedb;
  max-width: 620px;
  margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  position: relative; z-index: 2;
  display: flex; flex-wrap: wrap; gap: 0;
  border-top: 1px solid rgba(255,255,255,.12);
  padding: 30px 0 56px;
}
.hero-stats .stat { flex: 1; min-width: 150px; padding: 6px 16px; border-left: 1px solid rgba(255,255,255,.12); }
.hero-stats .stat:first-child { border-left: none; padding-left: 0; }
.hero-stats .num { font-size: 27px; font-weight: 800; color: #fff; letter-spacing: 1px; }
.hero-stats .num .u { color: var(--c-accent); font-size: 18px; }
.hero-stats .label { font-size: 13px; color: #9fb0c2; margin-top: 6px; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  align-items: center;
  gap: 40px;
}
.hero-visual {
  position: relative;
  z-index: 2;
  border-radius: 18px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.10);
  padding: 8px;
  box-shadow: 0 24px 70px rgba(0,0,0,.35);
}
.hero-visual img {
  display: block;
  width: 100%;
  border-radius: 12px;
}
.hero-stats { grid-column: 1 / -1; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-visual { order: 2; }
  .hero-stats { order: 3; }
}

/* ---------------- 通用区块 ---------------- */
section { padding: 88px 0; }
.section-soft { background: var(--c-bg-soft); }
.section-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.section-head .tag {
  font-size: 13px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--c-accent); font-weight: 700;
}
.section-head h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800; margin: 12px 0 14px;
  letter-spacing: .5px;
}
.section-head p { color: var(--c-ink-2); font-size: 16px; }

/* ---------------- 卡片网格 ---------------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all .28s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card .ico {
  width: 52px; height: 52px; border-radius: 13px;
  background: var(--c-accent-soft);
  color: var(--c-accent);
  display: grid; place-items: center;
  margin-bottom: 18px;
}
.card .ico svg { width: 26px; height: 26px; }
.card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--c-ink-2); font-size: 15px; }

/* 特性行 */
.feature-row { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.feature-row.reverse { direction: rtl; }
.feature-row.reverse > * { direction: ltr; }
.feature-copy h2 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; margin-bottom: 16px; }
.feature-copy p { color: var(--c-ink-2); margin-bottom: 20px; }
.feature-list li { display: flex; gap: 12px; margin-bottom: 12px; color: var(--c-ink); }
.feature-list li svg { width: 20px; height: 20px; color: var(--c-accent); flex: none; margin-top: 3px; }
.feature-visual {
  border-radius: var(--radius);
  min-height: 320px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-2));
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.feature-visual::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 38px 38px;
}
.feature-visual .float {
  position: absolute; left: 28px; right: 28px;
  background: rgba(255,255,255,.95);
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: var(--shadow-md);
  color: var(--c-ink);
}
.feature-visual .float.top { top: 30px; }
.feature-visual .float.btm { bottom: 30px; }
.feature-visual .float .k { font-size: 12px; color: var(--c-ink-3); }
.feature-visual .float .v { font-size: 22px; font-weight: 800; }
.feature-visual .float .v .up { color: var(--c-accent); font-size: 14px; }

.feature-visual-img {
  background: none;
  padding: 0;
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-visual-img::before { display: none; }
.feature-visual-img img {
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius);
  display: block;
}

/* ---------------- 数据条 ---------------- */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.metric .num { font-size: 44px; font-weight: 800; color: var(--c-primary); }
.metric .num .u { font-size: 22px; color: var(--c-accent); }
.metric .label { color: var(--c-ink-2); margin-top: 6px; }

/* ---------------- 行业/方案 ---------------- */
.sol-tabs { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 40px; }
.sol-tab {
  padding: 10px 22px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--c-line); background: #fff; color: var(--c-ink-2);
  font-weight: 600; font-size: 15px; transition: .2s;
}
.sol-tab.active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.sol-panel { display: none; }
.sol-panel.active { display: block; animation: fade .4s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px);} to {opacity:1; transform:none;} }

/* ---------------- 案例 ---------------- */
.case {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: all .28s;
  display: flex;
  flex-direction: column;
}
.case:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.case .case-top {
  padding: 26px 28px;
  background: linear-gradient(135deg, var(--c-bg-dark), var(--c-bg-dark-2));
  color: #fff;
}
.case .case-top .ind { font-size: 12px; letter-spacing: 1px; color: var(--c-accent); }
.case .case-top h3 { font-size: 21px; font-weight: 700; margin-top: 6px; }
.case .case-body { padding: 26px 28px; flex: 1; }
.case .case-body .row { margin-bottom: 16px; }
.case .case-body .row:last-child { margin-bottom: 0; }
.case .case-body .row .t { font-size: 13px; color: var(--c-ink-3); letter-spacing: 1px; }
.case .case-body .row .d { color: var(--c-ink); font-size: 15px; }
.case .case-foot {
  display: flex; gap: 26px; padding: 18px 28px; border-top: 1px solid var(--c-line);
  background: var(--c-bg-soft);
}
.case .case-foot .m .v { font-size: 24px; font-weight: 800; color: var(--c-accent); }
.case .case-foot .m .k { font-size: 12px; color: var(--c-ink-2); }

/* ---------------- 体系总览图 ---------------- */
.arch-figure {
  max-width: 1040px;
  margin: 0 auto;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: #fff;
}
.arch-figure img { width: 100%; height: auto; display: block; }

/* ---------------- 关于我们时间线 ---------------- */
.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: var(--c-line); }
.tl-item { position: relative; padding-bottom: 30px; }
.tl-item::before {
  content: ""; position: absolute; left: -29px; top: 6px;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 3px solid var(--c-accent);
}
.tl-item .yr { font-weight: 800; color: var(--c-primary); }
.tl-item h4 { font-size: 17px; margin: 4px 0 6px; }
.tl-item p { color: var(--c-ink-2); font-size: 15px; }

.value-grid .card .ico { background: var(--c-primary); color: #fff; }

/* ---------------- 联系我们 ---------------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.info-item { display: flex; gap: 16px; margin-bottom: 26px; }
.info-item .ico {
  width: 44px; height: 44px; border-radius: 11px; flex: none;
  background: var(--c-accent-soft); color: var(--c-accent);
  display: grid; place-items: center;
}
.info-item .ico svg { width: 22px; height: 22px; }
.info-item .k { font-size: 13px; color: var(--c-ink-3); }
.info-item .v { font-size: 17px; font-weight: 600; color: var(--c-ink); }
.wechat-qr { margin-top: 8px; padding: 20px; background: var(--c-bg-soft); border: 1px solid var(--c-border); border-radius: 14px; text-align: center; }
.wechat-qr .qr-title { font-size: 15px; font-weight: 700; color: var(--c-ink); margin-bottom: 14px; }
.wechat-qr img { width: 100px; height: 100px; object-fit: contain; border-radius: 8px; background: #fff; padding: 6px; box-shadow: 0 2px 10px rgba(0,0,0,.06); }
.wechat-qr .qr-tip { font-size: 13px; color: var(--c-ink-3); margin-top: 12px; }

.form .field { margin-bottom: 18px; }
.form label { display: block; font-size: 14px; color: var(--c-ink-2); margin-bottom: 7px; font-weight: 600; }
.form input, .form textarea, .form select {
  width: 100%; padding: 12px 14px;
  border: 1px solid var(--c-line); border-radius: var(--radius-sm);
  font-family: var(--font); font-size: 15px; color: var(--c-ink);
  background: #fff; transition: .2s;
}
.form input:focus, .form textarea:focus, .form select:focus {
  outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(15,61,110,.12);
}
.form textarea { resize: vertical; min-height: 110px; }
.form .err { color: #d64545; font-size: 13px; margin-top: 5px; display: none; }
.form .field.invalid .err { display: block; }
.form .field.invalid input, .form .field.invalid textarea { border-color: #d64545; }
.form .ok {
  display: none; margin-top: 14px; padding: 12px 16px; border-radius: var(--radius-sm);
  background: var(--c-accent-soft); color: #0c6b60; font-size: 14px; font-weight: 600;
}
.form.sent .ok { display: block; }

.map {
  margin-top: 30px; height: 220px; border-radius: var(--radius);
  background:
    linear-gradient(rgba(15,61,110,.55), rgba(15,61,110,.55)),
    repeating-linear-gradient(45deg, #1e64b4 0 22px, #1b5aa3 22px 44px);
  display: grid; place-items: center; color: #fff; font-weight: 600;
  border: 1px solid var(--c-line);
}

/* ---------------- 页脚 ---------------- */
.footer {
  background: var(--c-bg-dark);
  color: #aebccb;
  padding: 64px 0 28px;
}
.footer .top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; letter-spacing: .5px; }
.footer a { display: block; color: #9fb0c2; font-size: 14px; margin-bottom: 10px; transition: .2s; }
.footer a:hover { color: var(--c-accent); }
.footer .brand { color: #fff; margin-bottom: 14px; }
.footer .brand small { color: #7e93a8; }
.footer .desc { font-size: 14px; max-width: 320px; }
.footer .bottom {
  margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 13px; color: #7e93a8;
}

/* ---------------- 内页 Hero（浅底） ---------------- */
.page-hero {
  background: linear-gradient(180deg, var(--c-bg-soft), #fff);
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--c-line);
}
.page-hero .crumb { font-size: 13px; color: var(--c-ink-3); margin-bottom: 14px; }
.page-hero .crumb a:hover { color: var(--c-primary); }
.page-hero h1 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; letter-spacing: .5px; }
.page-hero p { color: var(--c-ink-2); margin-top: 12px; max-width: 640px; font-size: 17px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .metrics { grid-template-columns: repeat(2, 1fr); gap: 32px 24px; }
  .feature-row, .feature-row.reverse { grid-template-columns: 1fr; direction: ltr; gap: 32px; }
  .footer .top { grid-template-columns: 1fr 1fr; }
  .contact-wrap { grid-template-columns: 1fr; gap: 36px; }
}
@media (max-width: 720px) {
  .nav-links {
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 12px 16px; border-bottom: 1px solid var(--c-line);
    box-shadow: var(--shadow-md); display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-cta { margin: 8px 0 0; }
  .nav-toggle { display: block; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer .top { grid-template-columns: 1fr; }
  section { padding: 60px 0; }
  .hero-inner { padding: 64px 0 72px; }
}

/* ---------------- 标签 / 客户墙 ---------------- */
.tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-pill {
  display: inline-flex; align-items: center;
  font-size: 14px; color: var(--c-ink-2, #5a6b7e);
  background: #f4f7fb;
  border: 1px solid var(--c-line, #e6ecf3);
  padding: 7px 14px; border-radius: 999px;
}
.client-wall { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.client {
  display: inline-flex; align-items: center; justify-content: center;
  width: 164px; height: 76px;
  background: #fff; border: 1px solid var(--c-line, #e6ecf3);
  padding: 10px 14px; border-radius: 12px;
  box-shadow: 0 1px 2px rgba(16,32,56,.04);
}
.client img {
  max-width: 100%;
  max-height: 56px;
  object-fit: contain;
  filter: grayscale(0.15);
  transition: filter .2s ease;
}
.client:hover img { filter: grayscale(0); }
@media (max-width: 600px) {
  .client { width: 138px; height: 64px; padding: 8px 10px; }
  .client img { max-height: 46px; }
}