/* 业务介绍子页：顶栏/页脚与首页同系 + 正文版式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --primary: #0066ff;
  --primary-dark: #0047b3;
  --accent: #00b4d8;
  --sub-gray: #f4f6f9;
  --dark: #0a1628;
  --dark-soft: #132337;
  --text: #1a1a1a;
  --text-light: #5c6370;
  --nav-h: 64px;
  --nav-bg: #071a33;
  --nav-bg-deep: #051226;
  --nav-text: #ffffff;
  --floating-yellow: #ffc107;
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  background: #fff;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(19px, 2.65vw, 39px);
  padding: 0 clamp(26px, 6.5vw, 68px);
  height: var(--nav-h);
  min-height: var(--nav-h);
  background: linear-gradient(
    180deg,
    var(--nav-bg) 0%,
    var(--nav-bg-deep) 100%
  );
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  transition:
    box-shadow 0.35s,
    background 0.35s;
  overflow: visible;
}
.nav.scrolled {
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}
.logo {
  font-size: 26px;
  font-weight: 700;
  color: var(--nav-text);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo img {
  display: block;
  filter: brightness(0) invert(1);
  height: calc(var(--nav-h) * 0.45) !important;
  width: auto !important;
  max-height: 32px;
}
.nav-menu {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  flex: 1 1 auto;
  min-width: 0;
  justify-content: center;
  gap: clamp(22px, 2.9vw, 48px);
  padding: 0 clamp(10px, 1.9vw, 34px);
  overflow: visible;
}
.nav-menu > a,
.nav-menu > .nav-dropdown {
  padding-inline: clamp(6px, 0.75vw, 12px);
}
.nav-menu a {
  margin: 0;
  flex-shrink: 0;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.92);
  font-size: clamp(14px, calc(var(--nav-h) * 0.26), 20px);
  line-height: 1.2;
  font-weight: 500;
  transition: color 0.25s;
  position: relative;
  white-space: nowrap;
}
.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -0.2em;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.25s;
}
.nav-menu a:hover {
  color: var(--nav-text);
}
.nav-menu a:hover::after {
  width: 100%;
}
.nav-dropdown {
  position: relative;
  margin: 0;
  flex-shrink: 0;
}
.nav-dropdown-trigger {
  cursor: default;
  color: rgba(255, 255, 255, 0.92);
  font-size: clamp(14px, calc(var(--nav-h) * 0.26), 20px);
  line-height: 1.2;
  font-weight: 500;
  display: inline-block;
  position: relative;
  white-space: nowrap;
  user-select: none;
}
.nav-dropdown-trigger::after {
  content: "";
  position: absolute;
  bottom: -0.2em;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.25s;
}
.nav-dropdown:hover .nav-dropdown-trigger::after,
.nav-dropdown:focus-within .nav-dropdown-trigger::after {
  width: 100%;
}
.nav-dropdown:hover .nav-dropdown-trigger,
.nav-dropdown:focus-within .nav-dropdown-trigger {
  color: var(--nav-text);
}
.nav-dropdown-hover-zone {
  display: none;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 100%;
  padding-top: 14px;
  min-width: 100%;
  z-index: 1001;
}
.nav-dropdown:hover .nav-dropdown-hover-zone,
.nav-dropdown:focus-within .nav-dropdown-hover-zone {
  display: block;
}
.nav-dropdown.is-open .nav-dropdown-hover-zone {
  display: block;
}
.nav-dropdown-panel {
  min-width: 240px;
  padding: 10px 0;
  background: #fff;
  border: 1px solid rgba(10, 22, 40, 0.1);
  border-radius: 8px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
}
.nav-dropdown-panel a {
  display: block;
  padding: 10px 20px;
  margin: 0;
  color: var(--dark);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition:
    background 0.2s,
    color 0.2s;
}
.nav-dropdown-panel a::after {
  display: none !important;
}
.nav-dropdown-panel a:hover {
  background: rgba(0, 102, 255, 0.08);
  color: var(--primary);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.lang-select {
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 6px;
  font-size: 14px;
  outline: none;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.1);
  color: var(--nav-text);
}
.lang-select option {
  background: var(--nav-bg-deep);
  color: var(--nav-text);
}
.btn {
  padding: 9px 22px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s;
  white-space: nowrap;
}
.btn-console {
  background: linear-gradient(135deg, #ffc107 0%, #ff9800 100%);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(255, 193, 7, 0.3);
}
.btn-console:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 193, 7, 0.4);
}

/* 正文 */
.biz-detail {
  margin-top: var(--nav-h);
  padding: 0;
}
.biz-hero {
  background: linear-gradient(160deg, #061428 0%, #0a2344 45%, #0d3a6b 100%);
  color: #fff;
  padding: 48px 5% 40px;
  text-align: center;
}
.biz-hero-inner {
  max-width: 900px;
  margin: 0 auto;
}
/* 页首与首页 section-title 同构：主标题 + 英文副标 + 说明（深色底上浅色字） */
.biz-hero .section-title--hero {
  margin-bottom: 0;
}
.biz-hero .section-title--hero h1 {
  font-size: clamp(26px, 4.2vw, 38px);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
  color: #fff;
}
.biz-hero .section-title--hero .subtitle-en {
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 8px;
  letter-spacing: 0.06em;
  font-size: 14px;
  font-weight: 500;
}
.biz-hero .section-title--hero p:not(.subtitle-en) {
  color: rgba(255, 255, 255, 0.85);
  font-size: 16px;
  line-height: 1.75;
  max-width: 720px;
  margin: 0 auto;
}
.biz-hero-kicker {
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--floating-yellow);
  margin-bottom: 14px;
  font-weight: 600;
}
.biz-hero h1 {
  font-size: clamp(26px, 4.2vw, 38px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.biz-hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.75;
  max-width: 720px;
  margin: 0 auto;
}

.biz-wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 5% 0;
}

/* 与首页 index 一致的章节标题：主标题 + 英文副标 + 中文说明（居中） */
.section-title {
  text-align: center;
  margin-bottom: 36px;
}
.section-title h2 {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.section-title .subtitle-en {
  font-size: 15px;
  color: var(--text-light);
  font-weight: 400;
  margin-bottom: 6px;
}
.section-title p:not(.subtitle-en) {
  font-size: 16px;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.75;
}
.biz-block .section-title {
  margin-bottom: 28px;
}

.biz-block {
  margin-bottom: 44px;
}
/* 仅作用于「旧版」直接子级标题；勿匹配 .section-title 内 h2，否则会出左侧蓝条且字号被压成 1.25rem */
.biz-block > h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  line-height: 1.35;
}
.biz-block > p.lead {
  font-size: 16px;
  color: var(--text);
  line-height: 1.9;
  text-align: justify;
  margin-bottom: 12px;
}

.biz-points {
  display: grid;
  gap: 20px;
  margin-top: 8px;
}
@media (min-width: 720px) {
  .biz-points.cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .biz-points.cols-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}
.biz-point {
  background: var(--sub-gray);
  border: 1px solid rgba(10, 22, 40, 0.08);
  border-radius: 12px;
  padding: 22px 20px;
}
.biz-point h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 10px;
}
.biz-point p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.75;
}

.biz-adv-list {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
}
.biz-adv-list li {
  position: relative;
  padding-left: 1.1em;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}
.biz-adv-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

.biz-cases {
  display: grid;
  gap: 20px;
}
@media (min-width: 768px) {
  .biz-cases {
    grid-template-columns: 1fr 1fr;
  }
}
.biz-case {
  background: #fff;
  border: 1px solid rgba(10, 22, 40, 0.1);
  border-radius: 12px;
  padding: 22px 22px 24px;
  box-shadow: 0 8px 28px rgba(10, 22, 40, 0.06);
}
.biz-case h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 10px;
}
.biz-case p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
  text-align: justify;
}

.biz-back {
  text-align: center;
  margin-top: 8px;
  padding: 0 5% 24px;
}
.biz-back a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  font-size: 15px;
}
.biz-back a:hover {
  text-decoration: underline;
}

/* 统一宽版详情页 */
.biz-detail--wide .biz-hero-inner {
  max-width: 1100px;
}
.biz-detail--wide .biz-wrap {
  max-width: min(1440px, 94vw);
  padding: 56px 3vw 0;
}
.biz-detail--wide .biz-block {
  margin-bottom: 56px;
}
.biz-detail--wide .biz-block:last-child {
  margin-bottom: 0;
}

/* IoT 通信流量子页：首段概述（底与 body 同为白，避免与下方 biz-wrap 灰白跳变分层） */
.iot-native-page .iot-traffic-overview {
  position: relative;
  width: 100vw;
  max-width: none;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  box-sizing: border-box;
  padding: 56px max(5%, env(safe-area-inset-left, 0px)) 72px
    max(5%, env(safe-area-inset-right, 0px));
  background: #fff;
}
.iot-native-page .iot-traffic-overview .section.inner {
  padding: 0;
  max-width: 1400px;
  margin: 0 auto;
}
.iot-native-page .iot-traffic-overview .section-title {
  margin-bottom: clamp(22px, 3vw, 32px);
}
/* IoT 首段标题区：与下方各 biz-block 的 .section-title 字号/字重对齐；摘要行下品牌色装饰线 */
.iot-native-page .iot-traffic-overview .section-title h2 {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.iot-native-page .iot-traffic-overview .section-title .subtitle-en {
  font-size: 15px;
  color: var(--text-light);
  font-weight: 400;
  margin-bottom: 6px;
}
.iot-native-page .iot-traffic-overview .section-title p:not(.subtitle-en) {
  font-size: 16px;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.75;
}
.iot-native-page
  .iot-traffic-overview
  .section-title
  p:not(.subtitle-en)::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  margin: 14px auto 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.iot-native-page .iot-overview-lead {
  max-width: 1120px;
  margin: 0 auto;
  padding: 4px 0 0;
}
.iot-native-page .iot-overview-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text, #1e293b);
  text-align: left;
}
.iot-native-page .iot-overview-note + .iot-overview-note {
  margin-top: 14px;
}
.iot-native-page .iot-overview-note:empty {
  display: none;
}
.iot-native-page .iot-overview-note + .iot-overview-note:empty {
  margin-top: 0;
}
.iot-native-page .biz-wrap {
  padding-top: 72px;
}
.iot-native-page.biz-detail--wide .biz-wrap .biz-block {
  margin-bottom: 80px;
}
.iot-native-page.biz-detail--wide .biz-wrap .biz-block:last-child {
  margin-bottom: 0;
}

/* 统一卡片化内容模块 */
.cmp-lead,
.vpdn-lead,
.esim-lead,
.b2b-lead,
.sim-lead,
.net-lead {
  width: 100%;
  padding: 28px 30px;
  border: 1px solid rgba(10, 22, 40, 0.08);
  border-radius: 16px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  box-shadow: 0 10px 28px rgba(10, 22, 40, 0.05);
}

.cmp-note,
.vpdn-note,
.esim-note,
.b2b-note,
.sim-note,
.net-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text, #1e293b);
  text-align: justify;
}

.cmp-note + .cmp-note,
.vpdn-note + .vpdn-note,
.esim-note + .esim-note,
.b2b-note + .b2b-note,
.sim-note + .sim-note,
.net-note + .net-note {
  margin-top: 12px;
}

.cmp-feature-grid,
.cmp-value-grid,
.cmp-scene-grid,
.vpdn-tech-grid,
.vpdn-feature-grid,
.vpdn-adv-grid,
.esim-feature-grid,
.esim-value-grid,
.esim-scene-grid,
.b2b-feature-grid,
.b2b-value-grid,
.b2b-scene-grid,
.sim-feature-grid,
.sim-value-grid,
.sim-scene-grid,
.net-feature-grid,
.net-value-grid,
.net-scene-grid {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.cmp-feature-grid,
.vpdn-tech-grid,
.vpdn-feature-grid,
.esim-feature-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.cmp-value-grid,
.cmp-scene-grid,
.esim-value-grid,
.esim-scene-grid,
.b2b-feature-grid,
.b2b-value-grid,
.b2b-scene-grid,
.sim-feature-grid,
.sim-value-grid,
.sim-scene-grid,
.net-feature-grid,
.net-value-grid,
.net-scene-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.vpdn-adv-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.cmp-feature-card,
.cmp-value-card,
.cmp-scene-card,
.vpdn-card,
.esim-feature-card,
.esim-value-card,
.esim-scene-card,
.b2b-feature-card,
.b2b-value-card,
.b2b-scene-card,
.sim-feature-card,
.sim-value-card,
.sim-scene-card,
.net-feature-card,
.net-value-card,
.net-scene-card {
  background: #fff;
  border: 1px solid rgba(10, 22, 40, 0.08);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 10px 24px rgba(10, 22, 40, 0.05);
}

.cmp-feature-head,
.vpdn-feature-head,
.esim-feature-head,
.b2b-feature-head,
.sim-feature-head,
.net-feature-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.cmp-feature-num,
.vpdn-feature-num,
.esim-feature-num,
.b2b-feature-num,
.sim-feature-num,
.net-feature-num {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 102, 255, 0.1);
  color: var(--primary);
  font-size: 15px;
  font-weight: 700;
  flex-shrink: 0;
}

.cmp-feature-card h3,
.cmp-value-card h3,
.cmp-scene-card h3,
.vpdn-card h3,
.esim-feature-card h3,
.esim-value-card h3,
.esim-scene-card h3,
.b2b-feature-card h3,
.b2b-value-card h3,
.b2b-scene-card h3,
.sim-feature-card h3,
.sim-value-card h3,
.sim-scene-card h3,
.net-feature-card h3,
.net-value-card h3,
.net-scene-card h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
  color: #0f172a;
}

.cmp-feature-list,
.vpdn-feature-list,
.esim-feature-list,
.b2b-feature-list,
.sim-feature-list,
.net-feature-list {
  margin: 0;
  padding-left: 18px;
  color: var(--text);
  line-height: 1.8;
}

.cmp-feature-list li + li,
.vpdn-feature-list li + li,
.esim-feature-list li + li,
.b2b-feature-list li + li,
.sim-feature-list li + li,
.net-feature-list li + li {
  margin-top: 8px;
}

.cmp-value-card p,
.cmp-scene-card p,
.vpdn-card p,
.iot-note,
.esim-value-card p,
.esim-scene-card p,
.b2b-value-card p,
.b2b-scene-card p,
.sim-value-card p,
.sim-scene-card p,
.net-value-card p,
.net-scene-card p {
  margin-top: 10px;
  color: var(--text-light);
  line-height: 1.8;
}

.iot-visual {
  margin: 8px 0 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.iot-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}
.iot-visual--sim img {
  width: 85%;
  max-width: 85%;
}
.iot-visual--sim-custom img {
  width: 100%;
  max-width: 100%;
}
.iot-visual--sim-custom {
  margin-bottom: 0;
}
.iot-sim-showcase {
  width: 100%;
  display: flex;
  justify-content: center;
  margin: 6px 0 0;
  overflow: visible;
}
.iot-sim-showcase__inner {
  width: 125%;
  max-width: 125%;
  transform: scale(0.8);
  transform-origin: top center;
  margin-bottom: clamp(-140px, -18vw, -56px);
}
/* IoT 子页：减轻 SIM 展示区负边距，使「全规格 SIM」与「全域辐射」之间留白接近其他 biz-block 节奏 */
.iot-native-page .iot-sim-showcase__inner {
  margin-bottom: clamp(-72px, -10vw, -24px);
}
.iot-native-page .biz-wrap > .biz-block:first-of-type {
  padding-bottom: clamp(20px, 3vw, 36px);
}
.iot-sim-showcase__inner .iot-sim-size-table {
  width: 100%;
}
.iot-sim-size-table {
  border-collapse: collapse;
  margin: 0 auto 6px;
  table-layout: fixed;
}
.iot-sim-size-table th,
.iot-sim-size-table td {
  padding: 19px 8px;
  text-align: center;
  font-size: clamp(17px, 0.4vw + 0.9rem, 22px);
  line-height: 1.5;
  color: #0a1628;
  border: 1px solid #e4e8ef;
  background: #eff2f7;
  font-weight: 500;
}
.iot-sim-size-table th {
  width: 20%;
}
.iot-sim-size-table td {
  width: 20%;
}
@media (max-width: 700px) {
  .iot-sim-showcase__inner {
    width: 100%;
    max-width: 100%;
    transform: none;
    margin-bottom: 0;
  }
  .iot-native-page .iot-sim-showcase__inner {
    margin-bottom: 0;
  }
  .iot-visual--sim-custom {
    margin-bottom: 0;
  }
  .iot-sim-size-table th,
  .iot-sim-size-table td {
    font-size: 13px;
    padding: 13px 6px;
    word-break: break-word;
  }
}
/* IoT 子页：世界地图（ECharts）——与正文同宽、约 2:1，灰底与 option.backgroundColor 一致 */
.iot-visual.iot-visual--world-map {
  width: 100%;
}
.iot-visual--world-map .iot-world-map {
  position: relative;
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
}
.iot-visual--world-map .iot-world-map__chart {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 2 / 1;
  height: auto;
  min-height: 280px;
  margin: 0 auto;
  background: #e8eaef;
  border: none;
  border-radius: 0;
  box-shadow: none;
  overflow: hidden;
}
.iot-visual--world-map .iot-world-map__error {
  margin: 0;
  padding: 48px 20px;
  text-align: center;
  color: rgba(10, 22, 40, 0.55);
  font-size: 15px;
}

.iot-spec {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  background: transparent;
  border: none;
  border-radius: 0;
  overflow: visible;
  box-shadow: none;
}

.iot-spec th,
.iot-spec td {
  border: none;
  border-bottom: 1px solid rgba(10, 22, 40, 0.07);
  padding: 12px 10px;
  text-align: center;
  font-size: 14px;
  color: var(--text);
  vertical-align: middle;
}

.iot-spec tbody tr:last-child td {
  border-bottom: none;
}

.iot-spec th {
  background: transparent;
  font-weight: 700;
}

.iot-spec td:first-child {
  font-weight: 600;
  background: transparent;
  width: 24%;
}

/* IoT 子页：套餐规格 Tab — 深色高 Tab 条 + 下方无框内容区 */
.iot-spec-tabs {
  width: 100%;
  max-width: 100%;
  margin-top: 18px;
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  overflow: visible;
}
.iot-spec-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 0 clamp(16px, 4vw, 48px);
  margin: 0;
  min-height: 64px;
  align-items: stretch;
  background: #071830;
  border: none;
  border-radius: 0;
}
.iot-spec-tabs__tab {
  flex: 1 1 0;
  min-width: 0;
  margin: 0;
  padding: 22px clamp(18px, 3vw, 36px);
  font-size: clamp(16px, 1.1vw + 0.55rem, 19px);
  font-weight: 600;
  font-family: inherit;
  color: rgba(255, 255, 255, 0.58);
  background: transparent;
  border: none;
  border-bottom: 4px solid transparent;
  cursor: pointer;
  transition:
    color 0.2s,
    background 0.2s,
    border-color 0.2s;
  line-height: 1.35;
}
.iot-spec-tabs__tab:hover {
  color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.06);
}
.iot-spec-tabs__tab.is-active {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border-bottom-color: var(--accent);
}
.iot-spec-tabs__tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}
.iot-spec-tabs__panels {
  padding: clamp(20px, 3vw, 32px) clamp(16px, 4vw, 48px)
    clamp(24px, 3.5vw, 40px);
  background: #f4f6f9;
  border: none;
}
.iot-spec-tabs__panel {
  display: none;
}
.iot-spec-tabs__panel.is-active {
  display: block;
}
.iot-spec-tabs__options {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.iot-spec-tabs__option {
  margin: 0;
  padding: clamp(18px, 2.5vw, 26px) clamp(20px, 3vw, 32px);
  width: 100%;
  text-align: center;
  font-size: clamp(15px, 0.5vw + 0.85rem, 17px);
  font-weight: 600;
  color: var(--text);
  line-height: 1.55;
  border: none;
  border-radius: 0;
  background: #fff;
  box-shadow: none;
}
.iot-spec-tabs__option--muted {
  font-weight: 500;
  color: rgba(10, 22, 40, 0.38);
  background: rgba(255, 255, 255, 0.65);
}
@media (max-width: 640px) {
  .iot-spec-tabs__list {
    min-height: auto;
    padding: 0;
    flex-direction: column;
  }
  .iot-spec-tabs__tab {
    flex: 1 1 auto;
    width: 100%;
    padding: 18px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    border-left: 4px solid transparent;
  }
  .iot-spec-tabs__tab.is-active {
    border-bottom-color: rgba(255, 255, 255, 0.08);
    border-left-color: var(--accent);
    border-bottom-width: 1px;
  }
}

/* IoT 子页：套餐三大点 — 底图 + 暗叠层 + 居中一句（交互对齐 CMP 适用场景卡：悬停上浮、同行略淡） */
.iot-plan-cards {
  width: 100%;
  max-width: 100%;
  margin-top: 18px;
  background: #fff;
  box-sizing: border-box;
}
.iot-plan-cards__scene-row {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(12px, 1.8vw, 18px);
  padding: clamp(16px, 2.5vw, 24px) clamp(12px, 3vw, 28px);
  justify-content: center;
  align-items: stretch;
  box-sizing: border-box;
  margin-bottom: 32px;
}
.iot-plan-cards__scene {
  position: relative;
  flex: 1 1 220px;
  max-width: 400px;
  min-width: 0;
  min-height: clamp(200px, 28vw, 268px);
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
  background-color: #061428;
  background-size: cover;
  /* 锚定右下：cover 下多裁左上角，避开图源常见水印区 */
  background-position: 100% 100%;
  box-shadow: 0 12px 36px rgba(4, 16, 36, 0.32);
  transition:
    transform 0.32s ease,
    box-shadow 0.32s ease,
    opacity 0.28s ease;
  cursor: default;
}
.iot-plan-cards__scene--1 {
  background-image: url("../icon/IoT通信流量产品/计费周期.png");
}
.iot-plan-cards__scene--2 {
  background-image: url("../icon/IoT通信流量产品/叠加类型.png");
}
.iot-plan-cards__scene--3 {
  background-image: url("../icon/IoT通信流量产品/使用模式.png");
}
.iot-plan-cards__scene-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(4, 14, 32, 0.38) 0%,
    rgba(4, 12, 28, 0.62) 42%,
    rgba(2, 8, 20, 0.88) 100%
  );
  pointer-events: none;
}
.iot-plan-cards__scene-body {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: clamp(200px, 28vw, 268px);
  padding: clamp(18px, 2.5vw, 26px) clamp(14px, 2vw, 20px);
  box-sizing: border-box;
}
.iot-plan-cards__scene-title {
  margin: 0 0 10px;
  font-size: clamp(17px, 1vw + 0.85rem, 20px);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: #fff;
}
.iot-plan-cards__scene-desc {
  margin: 0;
  max-width: 22em;
  font-size: clamp(13px, 0.35vw + 0.76rem, 15px);
  font-weight: 400;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.92);
}
.iot-plan-cards__scene:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.iot-plan-cards__scene-row:has(.iot-plan-cards__scene:is(:hover, :focus-within))
  .iot-plan-cards__scene:not(:is(:hover, :focus-within)) {
  opacity: 0.86;
}
.iot-plan-cards__scene:is(:hover, :focus-within) {
  transform: translateY(-6px);
  box-shadow: 0 20px 48px rgba(2, 12, 32, 0.42);
}
@media (max-width: 720px) {
  .iot-plan-cards__scene {
    flex: 1 1 100%;
    max-width: none;
  }
}

/* 页脚（与首页一致） */
.footer {
  background: linear-gradient(
    180deg,
    var(--nav-bg) 0%,
    var(--nav-bg-deep) 100%
  );
  color: rgba(255, 255, 255, 0.92);
  padding: 52px 5% 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-main {
  display: grid;
  grid-template-columns: 1fr 1.8fr;
  gap: 80px;
  max-width: 1400px;
  margin: 0 auto;
  padding-bottom: 40px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-top: 4px;
}
.footer-link-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 28px;
}
.footer-link-row h4 {
  margin: 0;
  min-width: 96px;
  flex-shrink: 0;
}
.footer-link-row-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}
.footer-link-row-links a {
  display: inline-block;
  margin: 0;
}
.footer-link-row--legal {
  align-items: flex-start;
}
.footer-legal-col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
/* 兼容旧页脚结构（footer-legal-below 仍在 footer-legal-col 内）时，向左对齐到“关于我们”起点 */
.footer-legal-col > .footer-legal-below {
  margin-left: calc(-96px - 28px);
  width: calc(100% + 96px + 28px);
  max-width: none;
}
.footer-links > .footer-legal-below {
  margin-top: 20px;
  padding-top: 0;
  width: 100%;
  max-width: 100%;
}
.footer-legal-below {
  margin-top: 0;
  padding-top: 0;
}
.footer-legal-below__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 12px 24px;
  width: 100%;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.58);
}
.footer-legal-below__main {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  flex: 1;
  min-width: min(100%, 220px);
}
.footer-legal-below .footer-copy-left {
  display: inline-block;
  margin: 0;
  max-width: 100%;
}
.footer-legal-below .footer-memberships {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
.footer-legal-below .footer-member-logo {
  height: 26px;
  width: auto;
  display: block;
  background: #fff;
  padding: 4px 8px;
  border-radius: 4px;
  box-sizing: content-box;
}
.footer-links > .footer-legal-below .footer-copy-right,
.footer-legal-col > .footer-legal-below .footer-copy-right {
  margin-left: auto !important;
}
.footer-legal-below .footer-copy-right {
  flex-shrink: 0;
  text-align: right;
  color: rgba(255, 255, 255, 0.58) !important;
  text-decoration: none;
  display: inline !important;
  margin: 0 !important;
  font-size: 12px;
  transition: color 0.3s;
}
.footer-legal-below .footer-copy-right:hover {
  color: var(--accent) !important;
}
.footer-brand p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.8;
  max-width: 280px;
}
.footer-logo {
  height: 40px;
  width: auto;
  max-width: 280px;
  display: block;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
}
.footer-contact {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.8;
  margin: 0;
}
.social-links-wrapper {
  max-width: 210px;
}
.footer h4 {
  font-size: 16px;
  margin-bottom: 20px;
  color: var(--nav-text);
  font-weight: 600;
}
.footer-contact-stack {
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.footer-contact-block h4 {
  margin-bottom: 10px;
}
.footer-contact-block .footer-contact {
  margin-bottom: 6px;
}
.footer-contact-block .footer-contact:last-child {
  margin-bottom: 0;
}
.footer a {
  display: block;
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 12px;
  transition: color 0.3s;
}
.footer a:hover {
  color: var(--accent);
}
.social-links {
  display: flex;
  gap: 20px;
  margin-top: 20px;
  justify-content: flex-start;
}
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  text-decoration: none;
  position: relative;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
}
.social-link > img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}
.social-link:hover {
  transform: translateY(-3px);
}
.social-link:hover > img {
  opacity: 0.8;
}
.social-tooltip {
  display: none;
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 12px;
  white-space: nowrap;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
  z-index: 100;
}
.social-tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: #fff;
}
.social-tooltip--qr {
  min-width: 136px;
  white-space: normal;
  text-align: center;
}
.social-tooltip-title {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.4;
}
.social-tooltip--qr img {
  display: block;
  width: 108px;
  max-width: 108px;
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
}
.social-link:hover .social-tooltip {
  display: block;
}
/* 浮动侧栏（高于分镜背景/叠层，避免全宽背景时遮挡；仍低于全屏模态时可将模态提至更高） */
.floating-sidebar {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10050;
  display: flex;
  flex-direction: column;
  gap: 0;
  opacity: 0.75;
  transition: opacity 0.3s;
}
.floating-sidebar:hover {
  opacity: 1;
}
.floating-item {
  position: relative;
  width: 48px;
  height: 48px;
  background: var(--floating-yellow);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s;
  border: none;
}
.floating-item:hover {
  background: #ffb300;
  transform: translateX(-4px);
}
.floating-icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
}
.floating-item + .floating-item {
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}
.floating-tooltip {
  position: absolute;
  right: 100%;
  top: 50%;
  transform: translateY(-50%);
  background: #fff;
  color: var(--text);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 13px;
  white-space: nowrap;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.2s,
    margin-right 0.2s;
  margin-right: -10px;
}
.floating-item:hover .floating-tooltip {
  opacity: 1;
  margin-right: 8px;
}
.floating-tooltip a {
  color: var(--primary);
  text-decoration: none;
}
.floating-tooltip a:hover {
  text-decoration: underline;
}
.floating-tooltip.wechat-tip {
  padding: 8px;
  white-space: normal;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.floating-tooltip.wechat-tip img {
  width: 100px;
  height: auto;
  display: block;
}

@media (max-width: 1200px) {
  .footer-main {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .vpdn-adv-grid,
  .b2b-feature-grid,
  .b2b-value-grid,
  .b2b-scene-grid,
  .sim-feature-grid,
  .sim-value-grid,
  .sim-scene-grid,
  .net-feature-grid,
  .net-value-grid,
  .net-scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 980px) {
  .cmp-feature-grid,
  .cmp-value-grid,
  .cmp-scene-grid,
  .vpdn-tech-grid,
  .vpdn-feature-grid,
  .vpdn-adv-grid,
  .esim-feature-grid,
  .esim-value-grid,
  .esim-scene-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  /* 与首页 index 窄屏一致 */
  .section-title h2 {
    font-size: 26px;
  }
  .footer-main {
    grid-template-columns: 1fr;
  }
  .footer-link-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .footer-link-row h4 {
    min-width: 0;
    margin-bottom: 4px;
  }
  .footer-legal-col > .footer-legal-below {
    margin-left: 0;
    width: 100%;
    max-width: 100%;
  }
  .footer-legal-below__inner {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }
  .footer-legal-below__main {
    flex-direction: column;
    align-items: center;
    min-width: 0;
  }
  .footer-links > .footer-legal-below .footer-copy-right,
  .footer-legal-col > .footer-legal-below .footer-copy-right {
    margin-left: 0 !important;
  }
  .footer-legal-below .footer-copy-right {
    text-align: center;
    align-self: center;
  }
  .biz-detail--wide .biz-wrap {
    max-width: 100%;
    padding: 40px 5% 0;
  }
  .cmp-lead,
  .vpdn-lead,
  .esim-lead,
  .b2b-lead,
  .sim-lead,
  .net-lead,
  .cmp-feature-card,
  .cmp-value-card,
  .cmp-scene-card,
  .vpdn-card,
  .esim-feature-card,
  .esim-value-card,
  .esim-scene-card,
  .b2b-feature-card,
  .b2b-value-card,
  .b2b-scene-card,
  .sim-feature-card,
  .sim-value-card,
  .sim-scene-card,
  .net-feature-card,
  .net-value-card,
  .net-scene-card {
    padding: 18px;
  }
  .cmp-feature-grid,
  .cmp-value-grid,
  .cmp-scene-grid,
  .vpdn-tech-grid,
  .vpdn-feature-grid,
  .vpdn-adv-grid,
  .esim-feature-grid,
  .esim-value-grid,
  .esim-scene-grid,
  .b2b-feature-grid,
  .b2b-value-grid,
  .b2b-scene-grid,
  .sim-feature-grid,
  .sim-value-grid,
  .sim-scene-grid,
  .net-feature-grid,
  .net-value-grid,
  .net-scene-grid {
    grid-template-columns: 1fr;
  }
}