/* ==========================================================================
   NanoCloud - 腾讯安全 (security.tencent.com TSRC 2.0) 主题风格
   配色规范：
   - 品牌主色：腾讯科技蓝 #0052D9 / 深蓝 #1d2088 / 高亮蓝 #1D43CE
   - 按钮光效：TSRC 标志性径向渐变立体高光
   - 背景体系：浅灰页面底 #fbfbfb / 首屏浅蓝灰底 #e8edf6 / 纯白卡片 #ffffff
   - 辅助点缀：安全绿 #16af48 / 奖励金橙 #ff6f00 / 浅蓝底 #edf5ff
   - 边框规范：细致浅蓝灰 #e0e4ed
   - 字体体系：PingFang SC, MiSans, -apple-system, Segoe UI, sans-serif
   ========================================================================== */

:root {
  /* TSRC 核心色彩 */
  --tsrc-navy: #1d2088;
  --tsrc-blue: #0052d9;
  --tsrc-blue-hover: #1d43ce;
  --tsrc-blue-light: #edf5ff;
  --tsrc-blue-soft: #f2f7ff;
  --tsrc-cyan: #00a4e4;

  --brand: var(--tsrc-blue);
  --brand-hover: var(--tsrc-blue-hover);
  --brand-soft: var(--tsrc-blue-light);
  --brand-navy: var(--tsrc-navy);

  /* 渐变系列 */
  --grad: linear-gradient(135deg, #1d2088 0%, #0052d9 100%);
  --grad-banner: linear-gradient(135deg, #1d43ce 0%, #0052d9 100%);
  --grad-soft: linear-gradient(135deg, rgba(0, 82, 217, 0.08) 0%, rgba(29, 32, 136, 0.04) 100%);
  --grad-btn: radial-gradient(closest-side, rgba(91, 121, 254, 1) 0%, rgba(71, 59, 240, 1) 100%);

  /* 文字深浅 */
  --ink: #2b2e2e;
  --ink-title: #1d2088;
  --ink-2: #545c6b;
  --ink-3: #868e9c;
  --ink-4: #c0c6d4;

  /* 边框与线 */
  --line: #e0e4ed;
  --line-2: #edf0f6;
  --line-dark: #cbd3e2;

  /* 背景系统 */
  --bg: #ffffff;
  --bg-page: #fbfbfb;
  --bg-soft: #f4f6fa;
  --bg-banner: #e8edf6;
  --bg-tint: #f8fafd;

  /* 状态色 */
  --ok: #16af48;
  --ok-soft: #eefbf3;
  --warn: #ff6f00;
  --warn-soft: #fff7e8;

  /* 圆角 */
  --r: 8px;
  --r-md: 10px;
  --r-sm: 6px;
  --pill: 999px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 8px 24px rgba(29, 32, 136, 0.1), 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 16px 36px -8px rgba(29, 32, 136, 0.14), 0 4px 12px -2px rgba(0, 0, 0, 0.05);
  --shadow-brand: 0px 14px 28px 0px rgba(146, 168, 209, 0.6), inset 0px 2px 2.6px 0px rgba(176, 200, 255, 0.51), 0px 4px 7.8px 0px rgba(242, 244, 243, 0.5);

  --maxw: 1200px;
  --hdr: 70px;
  --font: "PingFang SC", "MiSans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--hdr) + 16px);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  background: var(--bg-page);
  color: var(--ink);
  font: 400 15.5px/1.7 var(--font);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

p {
  margin: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

img, svg {
  display: block;
  max-width: 100%;
}

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

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

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

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  background: var(--tsrc-navy);
  color: #fff;
  padding: 10px 18px;
  border-radius: 0 0 var(--r) 0;
  font-weight: 600;
}

.skip:focus {
  left: 0;
}

/* TSRC 标志性深蓝渐变字 */
.grad-text {
  color: var(--tsrc-navy);
  background: linear-gradient(135deg, #1d2088 15%, #0052d9 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ==========================================================================
   顶栏导航 (参考 TSRC .v2-navigation 标准 70px)
   ========================================================================== */
.hdr {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--hdr);
  background: rgba(255, 255, 255, 0.98);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03);
}

.hdr-in {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--tsrc-navy);
}

/* TSRC 晶体安全盾标微徽章 */
.logo-i {
  width: 32px;
  height: 32px;
  border-radius: 7px;
  background: linear-gradient(145deg, #2844cc 0%, #0052d9 60%, #003db3 100%);
  display: grid;
  place-items: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 17px;
  font-family: var(--font);
  box-shadow: 0 4px 12px -2px rgba(0, 82, 217, 0.45), inset 0 1px 1px rgba(255, 255, 255, 0.4);
  position: relative;
  overflow: hidden;
}

.logo-i::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(60deg, transparent 40%, rgba(255, 255, 255, 0.25) 50%, transparent 60%);
  pointer-events: none;
}

.nav {
  display: flex;
  height: 100%;
  gap: 6px;
  margin-left: auto;
}

.nav a {
  display: flex;
  align-items: center;
  padding: 0 16px;
  height: 100%;
  font-size: 15.5px;
  color: #000000;
  font-weight: 500;
  position: relative;
  transition: color 0.2s ease;
}

.nav a:hover {
  color: var(--tsrc-blue-hover);
  font-weight: 600;
}

/* TSRC 激活态底部 3px 指示横线 */
.nav a[aria-current="page"] {
  color: var(--tsrc-navy);
  font-weight: 600;
}

.nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 14px;
  right: 14px;
  height: 3px;
  background-color: var(--tsrc-navy);
  border-radius: 3px 3px 0 0;
}

.hdr .btn {
  margin-left: 12px;
}

@media (max-width: 900px) {
  .nav {
    display: none;
  }
  .hdr-in {
    gap: 12px;
  }
  .hdr .btn {
    margin-left: auto;
  }
}

/* 手机端二级导航 */
.subnav {
  display: none;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 8px 20px 10px;
  margin: 0 -24px;
  background: #ffffff;
  border-bottom: 1px solid var(--line-2);
}

.subnav::-webkit-scrollbar {
  display: none;
}

.subnav a {
  flex: 0 0 auto;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 14px;
  color: var(--ink-2);
  background: #ffffff;
  white-space: nowrap;
}

.subnav a[aria-current="page"] {
  border-color: var(--tsrc-navy);
  color: var(--tsrc-navy);
  font-weight: 600;
  background: var(--tsrc-blue-light);
}

@media (max-width: 900px) {
  .subnav {
    display: flex;
  }
}

/* ==========================================================================
   按钮体系 (TSRC 经典按钮规范)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: 600 15px/1.5 var(--font);
  white-space: nowrap;
  padding: 10px 20px;
  border: none;
  border-radius: var(--r);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}

/* TSRC 标志性高光深蓝立体主按钮 */
.btn-primary, .btn-grad {
  background: radial-gradient(closest-side, rgba(91, 121, 254, 1) 0%, rgba(71, 59, 240, 1) 100%);
  color: #ffffff;
  box-shadow: 0px 10px 22px 0px rgba(146, 168, 209, 0.55), inset 0px 2px 2.6px 0px rgba(176, 200, 255, 0.51), 0px 4px 7.8px 0px rgba(242, 244, 243, 0.5);
  letter-spacing: 0.05em;
  border: none;
}

.btn-primary:hover, .btn-grad:hover {
  transform: translateY(-2px);
  box-shadow: 0px 16px 28px 0px rgba(146, 168, 209, 0.72), inset 0px 2px 2.6px 0px rgba(176, 200, 255, 0.6), 0px 6px 12px 0px rgba(242, 244, 243, 0.6);
  color: #ffffff;
}

.btn-primary:active, .btn-grad:active {
  transform: translateY(0);
}

/* TSRC 白底细蓝边次级按钮 */
.btn-ghost {
  background: #ffffff;
  color: var(--tsrc-blue);
  border: 1px solid var(--tsrc-blue);
  box-shadow: var(--shadow-sm);
}

.btn-ghost:hover {
  background: var(--tsrc-blue-light);
  border-color: var(--tsrc-blue-hover);
  color: var(--tsrc-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 82, 217, 0.12);
}

.btn-white {
  background: #ffffff;
  color: var(--tsrc-navy);
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.btn-white:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.2);
}

.btn-lg {
  padding: 13px 28px;
  font-size: 16px;
  border-radius: var(--r);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 14px;
  border-radius: var(--r-sm);
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   排版与区块规范
   ========================================================================== */
section {
  padding: 72px 0;
}

@media (max-width: 720px) {
  section {
    padding: 48px 0;
  }
}

.sec-soft {
  background: var(--bg-soft);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}

.head {
  max-width: 680px;
  margin-bottom: 40px;
}

.head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--tsrc-blue);
  background: var(--tsrc-blue-light);
  border: 1px solid rgba(0, 82, 217, 0.15);
  border-radius: var(--pill);
  padding: 4px 14px;
}

.head h2 {
  font-size: clamp(24px, 3.4vw, 34px);
  color: var(--ink-title);
  letter-spacing: -0.015em;
}

.head p {
  margin-top: 12px;
  color: var(--ink-2);
  font-size: 16px;
}

/* 面包屑导航 */
.crumb {
  padding: 16px 0 0;
  font-size: 13.5px;
  color: var(--ink-3);
}

.crumb a:hover {
  color: var(--tsrc-blue);
}

.crumb span {
  margin: 0 8px;
  color: var(--ink-4);
}

/* ==========================================================================
   首屏 Hero 区域 (TSRC 2.0 旗舰 Banner 风格)
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 76px 0 68px;
  background-color: var(--bg-banner);
  background-image:
    radial-gradient(ellipse 900px 450px at 50% -10%, rgba(91, 121, 254, 0.22) 0%, rgba(29, 32, 136, 0.06) 55%, transparent 80%),
    linear-gradient(rgba(224, 232, 245, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(224, 232, 245, 0.45) 1px, transparent 1px);
  background-size: 100% 100%, 36px 36px, 36px 36px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 52px;
  align-items: center;
}

@media (max-width: 980px) {
  .hero {
    padding: 48px 0 44px;
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

.hero h1 {
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1.25;
  color: var(--tsrc-navy);
  font-weight: 700;
  letter-spacing: -0.015em;
}

.hero-sub {
  margin-top: 16px;
  font-size: 17.5px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.hero .lead {
  margin-top: 14px;
  font-size: 15.5px;
  color: var(--ink-2);
  line-height: 1.75;
  max-width: 38em;
}

.hero .act {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.hero .hint {
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-3);
}

/* 标签胶囊 */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.tags li {
  font-size: 13px;
  color: var(--tsrc-navy);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid #d2dcee;
  border-radius: var(--pill);
  padding: 4px 13px;
  font-weight: 500;
  backdrop-filter: blur(4px);
}

/* ==========================================================================
   控制台示意卡片 (TSRC 企业级控制台设计)
   ========================================================================== */
.mock {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: 0 12px 32px -6px rgba(29, 32, 136, 0.12), 0 4px 12px rgba(0, 0, 0, 0.04);
  overflow: hidden;
  position: relative;
}

/* TSRC 招牌折角水印装饰 */
.mock::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 90px;
  height: 90px;
  background: linear-gradient(135deg, transparent 50%, rgba(0, 82, 217, 0.05) 50%);
  pointer-events: none;
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 18px;
  background: #f4f6fa;
  border-bottom: 1px solid var(--line);
}

.mock-bar i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #c6d0df;
}

.mock-bar i:nth-child(1) { background: #ff5f56; }
.mock-bar i:nth-child(2) { background: #ffbd2e; }
.mock-bar i:nth-child(3) { background: #27c93f; }

.mock-bar span {
  margin-left: auto;
  font-size: 12.5px;
  color: var(--ink-2);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

.mock-bar span::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 6px var(--ok);
}

.mock-body {
  padding: 22px;
}

.mock-lead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-size: 14px;
  color: var(--ink-2);
}

.mock-lead b {
  font-size: 24px;
  color: var(--tsrc-navy);
  letter-spacing: -0.02em;
}

.mock-bar-line {
  height: 8px;
  border-radius: var(--pill);
  background: #e9ecf3;
  overflow: hidden;
  margin: 12px 0 20px;
}

.mock-bar-line i {
  display: block;
  height: 100%;
  width: 28%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, #1d43ce 0%, #0052d9 100%);
  box-shadow: 0 0 8px rgba(0, 82, 217, 0.5);
}

.mock-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.mock-grid div {
  background: #f7f9fd;
  border: 1px solid #e7ecf5;
  border-radius: var(--r-sm);
  padding: 12px 14px;
}

.mock-grid span {
  display: block;
  font-size: 12px;
  color: var(--ink-3);
  margin-bottom: 4px;
}

.mock-grid b {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.mock-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-top: 1px solid var(--line-2);
  font-size: 14px;
  color: var(--ink-2);
}

.mock-row b {
  font-weight: 600;
  color: var(--tsrc-navy);
}

.mock-cap {
  margin-top: 12px;
  font-size: 12px;
  color: var(--ink-4);
  text-align: center;
}

/* ==========================================================================
   数字统计条 (TSRC 专家数据统计风格)
   ========================================================================== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.stats div {
  background: #ffffff;
  padding: 22px 18px;
  text-align: center;
  transition: background-color 0.2s ease;
}

.stats div:hover {
  background: var(--bg-tint);
}

.stats b {
  display: block;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--tsrc-navy);
}

.stats span {
  display: block;
  margin-top: 4px;
  font-size: 13.5px;
  color: var(--ink-3);
  font-weight: 500;
}

@media (max-width: 640px) {
  .stats {
    grid-template-columns: 1fr 1fr;
  }
}

/* ==========================================================================
   套餐卡片 (Plans Section)
   ========================================================================== */
.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

@media (max-width: 940px) {
  .plans {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
}

.plan {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
}

.plan:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: #cbd5e5;
}

/* TSRC 推荐套餐高亮边框与徽章 */
.plan.rec {
  border: 2px solid var(--tsrc-blue);
  box-shadow: 0 12px 30px -8px rgba(0, 82, 217, 0.2), 0 4px 12px rgba(0, 0, 0, 0.04);
}

.plan.rec::before {
  display: none;
}

.plan-tag {
  position: absolute;
  top: -12px;
  left: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, #1d43ce 0%, #0052d9 100%);
  color: #ffffff;
  padding: 3px 12px;
  border-radius: var(--pill);
  box-shadow: 0 4px 10px rgba(0, 82, 217, 0.4);
}

.plan h3 {
  font-size: 21px;
  color: var(--tsrc-navy);
}

.plan-sub {
  margin-top: 4px;
  font-size: 13.5px;
  color: var(--ink-3);
}

.price {
  display: flex;
  align-items: baseline;
  gap: 3px;
  margin: 18px 0 20px;
}

.price span {
  font-size: 20px;
  font-weight: 600;
  color: var(--tsrc-navy);
}

.price b {
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--tsrc-navy);
}

.price i {
  font-style: normal;
  font-size: 14px;
  color: var(--ink-3);
}

.spec {
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
  padding: 14px 0;
  display: grid;
  gap: 10px;
}

.spec li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14.5px;
}

.spec span {
  color: var(--ink-3);
}

.spec b {
  font-weight: 600;
  color: var(--ink);
}

.feats {
  margin: 18px 0 24px;
  display: grid;
  gap: 11px;
}

.feats li {
  display: flex;
  gap: 9px;
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.55;
}

.feats li svg {
  flex: 0 0 auto;
  margin-top: 4px;
  color: var(--ok);
}

.feats li.off {
  color: var(--ink-4);
}

.feats li.off svg {
  color: var(--ink-4);
}

.plan .btn {
  margin-top: auto;
}

/* ==========================================================================
   功能卡片网格 (参考 TSRC .card-base 及安全动态卡片)
   ========================================================================== */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 920px) {
  .cards {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}

@media (max-width: 560px) {
  .cards {
    grid-template-columns: 1fr;
  }
}

.card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  position: relative;
  overflow: hidden;
}

/* TSRC 标志性几何微折角装饰 */
.card::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, transparent 50%, rgba(0, 82, 217, 0.04) 50%);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: #cbd5e5;
}

.card-ico {
  width: 44px;
  height: 44px;
  border-radius: var(--r);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  background: var(--tsrc-blue-light);
  color: var(--tsrc-blue);
  box-shadow: inset 0 0 0 1px rgba(0, 82, 217, 0.12);
}

.card h3 {
  font-size: 17.5px;
  color: var(--ink-title);
  margin-bottom: 8px;
}

.card p {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.65;
}

/* ==========================================================================
   平台支持 (Platforms)
   ========================================================================== */
.plats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 780px) {
  .plats {
    grid-template-columns: 1fr;
  }
}

.plat {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.plat:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.plat-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.plat-ico {
  width: 42px;
  height: 42px;
  border-radius: var(--r);
  display: grid;
  place-items: center;
  background: var(--tsrc-blue-light);
  color: var(--tsrc-blue);
}

.plat h3 {
  font-size: 17px;
  color: var(--ink-title);
}

.plat p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-3);
  line-height: 1.6;
}

.note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-3);
}

/* ==========================================================================
   步骤流程 (Steps)
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  counter-reset: s;
}

@media (max-width: 780px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

.step {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.step:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.step::before {
  counter-increment: s;
  content: counter(s);
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #1d43ce 0%, #0052d9 100%);
  color: #ffffff;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(0, 82, 217, 0.35);
}

.step h3 {
  font-size: 17.5px;
  color: var(--ink-title);
  margin-bottom: 8px;
}

.step p {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.65;
}

/* ==========================================================================
   表格规范 (Table)
   ========================================================================== */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 14.5px;
}

th, td {
  padding: 15px 20px;
  text-align: left;
  border-bottom: 1px solid var(--line-2);
}

thead th {
  background: #f2f5fa;
  font-weight: 600;
  font-size: 14.5px;
  color: var(--tsrc-navy);
  white-space: nowrap;
}

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

tbody tr:hover td {
  background: var(--bg-tint);
}

tbody th {
  font-weight: 500;
  color: var(--ink-2);
  width: 190px;
}

td b {
  font-weight: 600;
  color: var(--ink);
}

.col-rec {
  background: rgba(0, 82, 217, 0.035);
}

@media (max-width: 900px) {
  table {
    min-width: 560px;
  }
  th, td {
    padding: 12px;
  }
  thead th:first-child, tbody th {
    position: sticky;
    left: 0;
    z-index: 2;
    background: #ffffff;
    box-shadow: 1px 0 0 var(--line-2);
  }
  thead th:first-child {
    background: #f2f5fa;
    z-index: 3;
  }
  tbody th {
    width: 110px;
    font-size: 13.5px;
  }
  td .btn {
    padding: 6px 12px;
    font-size: 13px;
  }
}

.tick {
  color: var(--ok);
  font-weight: 700;
}

.dash {
  color: var(--ink-4);
}

/* ==========================================================================
   常见问题 (FAQ 手风琴)
   ========================================================================== */
.faq {
  display: grid;
  gap: 12px;
  max-width: 840px;
  margin: 0 auto;
}

details {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  overflow: hidden;
}

details:hover {
  border-color: #cbd5e5;
}

details[open] {
  border-color: var(--tsrc-blue);
  box-shadow: 0 4px 16px rgba(0, 82, 217, 0.08);
}

summary {
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--ink);
  transition: color 0.2s ease;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "";
  margin-left: auto;
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-right: 2px solid var(--ink-3);
  border-bottom: 2px solid var(--ink-3);
  transform: rotate(45deg);
  transition: transform 0.25s ease, border-color 0.2s ease;
}

details[open] summary {
  color: var(--tsrc-navy);
}

details[open] summary::after {
  transform: rotate(-135deg);
  border-color: var(--tsrc-blue);
}

details .body {
  padding: 0 22px 20px;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.7;
}

details .body p + p {
  margin-top: 10px;
}

details .body ul {
  margin-top: 10px;
  display: grid;
  gap: 7px;
}

details .body li {
  padding-left: 18px;
  position: relative;
}

details .body li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--tsrc-blue);
}

/* ==========================================================================
   底部收口横幅 (CTA Band - TSRC 旗舰级深蓝)
   ========================================================================== */
.band {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  background: linear-gradient(135deg, #1d2088 0%, #1538aa 50%, #0052d9 100%);
  color: #ffffff;
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 24px 50px -18px rgba(29, 32, 136, 0.45);
}

.band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 240px at 50% 0%, rgba(255, 255, 255, 0.18), transparent 70%);
  pointer-events: none;
}

.band h2 {
  font-size: clamp(23px, 3.4vw, 32px);
  color: #ffffff;
}

.band p {
  margin-top: 12px;
  font-size: 16.5px;
  color: rgba(255, 255, 255, 0.9);
}

.band .act {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 28px;
  position: relative;
  z-index: 2;
}

@media (max-width: 640px) {
  .band {
    padding: 38px 24px;
    border-radius: var(--r);
  }
}

/* ==========================================================================
   页脚 Footer (TSRC 经典底部)
   ========================================================================== */
footer {
  background: #f2f5fa;
  border-top: 1px solid var(--line);
  padding: 50px 0 28px;
  margin-top: 0;
}

.fgrid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr;
  gap: 36px;
}

@media (max-width: 820px) {
  .fgrid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

@media (max-width: 380px) {
  .fgrid {
    grid-template-columns: 1fr;
  }
}

.fcol h3 {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--tsrc-navy);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.fcol li a {
  display: block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--ink-2);
}

.fcol li a:hover {
  color: var(--tsrc-blue);
}

.fcol p {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.7;
  max-width: 32em;
}

.fbot {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  font-size: 13.5px;
  color: var(--ink-3);
}

.fbot a:hover {
  color: var(--tsrc-blue);
}

/* ==========================================================================
   手机底部快捷常驻栏
   ========================================================================== */
.mbar {
  display: none;
}

@media (max-width: 900px) {
  .mbar {
    display: flex;
    gap: 10px;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    padding: 8px 16px calc(8px + env(safe-area-inset-bottom));
    background: rgba(255, 255, 255, 0.96);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--line);
  }
  .mbar .btn {
    flex: 1;
    padding: 12px 14px;
  }
  body {
    padding-bottom: 76px;
  }
}