/* =========================================================
   RingLove 官方网站 - 全局样式
   纯静态，无外部依赖
   ========================================================= */

:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --bg-deep: #0b1220;

  --ink: #0d1526;
  --ink-2: #3b4759;
  --muted: #6b778c;
  --muted-2: #8b97ab;

  --line: #e6eaf2;
  --line-strong: #d6deeb;

  --brand: #2f7cf6;
  --brand-2: #1ccbb7;
  --grad: linear-gradient(115deg, #2f7cf6 0%, #1ccbb7 100%);

  --danger: #e05656;

  --shadow-sm: 0 1px 2px rgba(13, 21, 38, 0.06);
  --shadow-md: 0 24px 60px -28px rgba(13, 21, 38, 0.28);

  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 30px;

  --container: 1160px;
  --header-h: 70px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.no-scroll {
  overflow: hidden;
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
h4,
p,
figure {
  margin: 0;
}

h1,
h2 {
  text-wrap: balance;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 6px;
}

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

.svg-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -0.125em;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  text-decoration: none;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 12px;
}

/* ---------------- 按钮 ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
    background-color 0.2s var(--ease), border-color 0.2s var(--ease),
    color 0.2s var(--ease);
}

.btn svg {
  flex: none;
}

.btn .icon {
  width: 17px;
  height: 17px;
}

.btn-primary {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 14px 28px -16px rgba(13, 21, 38, 0.75);
}

.btn-primary:hover {
  background: #16233a;
  transform: translateY(-1px);
}

.btn-ghost {
  background: #fff;
  border-color: var(--line-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: #b9c6da;
  background: #fbfcfe;
  transform: translateY(-1px);
}

.btn-grad {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 16px 32px -18px rgba(47, 124, 246, 0.9);
}

.btn-grad:hover {
  transform: translateY(-1px);
  box-shadow: 0 20px 36px -18px rgba(47, 124, 246, 0.95);
}

.btn-light {
  background: #fff;
  color: var(--ink);
}

.btn-light:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px -16px rgba(0, 0, 0, 0.5);
}

.btn-sm {
  height: 40px;
  padding: 0 18px;
  font-size: 14px;
}

.btn-block {
  width: 100%;
}

/* ---------------- 顶部导航 ---------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 12px 30px -26px rgba(13, 21, 38, 0.55);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  width: 32px;
  height: 32px;
  flex: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.nav a {
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--ink-2);
  text-decoration: none;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.nav a:hover {
  background: var(--bg-soft);
  color: var(--ink);
}

.nav a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  position: relative;
}

.nav-toggle span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 1.6px;
  border-radius: 2px;
  background: var(--ink);
  transform: translate(-50%, -50%);
  transition: transform 0.2s var(--ease);
}

.nav-toggle span:first-child {
  transform: translate(-50%, calc(-50% - 4px));
}

.nav-toggle span:last-child {
  transform: translate(-50%, calc(-50% + 4px));
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translate(-50%, -50%) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* ---------------- 通用排版 ---------------- */

.kicker {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
}

.section {
  padding: 100px 0;
}

.section-head {
  max-width: 680px;
  margin-bottom: 52px;
}

.section-head h2 {
  margin: 14px 0 16px;
  font-size: clamp(1.75rem, 3.1vw, 2.6rem);
  line-height: 1.22;
  letter-spacing: -0.025em;
  font-weight: 700;
}

.section-head p {
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--muted);
}

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

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

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------------- 首屏 ---------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 84px;
  background:
    radial-gradient(1100px 560px at 80% 12%, #e9f2ff 0%, rgba(233, 242, 255, 0) 62%),
    radial-gradient(900px 520px at 6% 92%, #e6fbf7 0%, rgba(230, 251, 247, 0) 58%),
    #fff;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 14px 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  font-size: 13px;
  color: var(--ink-2);
}

.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-2);
  box-shadow: 0 0 0 4px rgba(28, 203, 183, 0.14);
}

.hero h1 {
  margin: 22px 0 20px;
  font-size: clamp(2.35rem, 5.2vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
  font-weight: 700;
}

.hero-lead {
  max-width: 33em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--ink-2);
}

.hero-points span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-points svg {
  color: var(--brand-2);
  flex: none;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-stage {
  position: relative;
  width: min(100%, 492px);
  display: grid;
  place-items: center;
}

.hero-ring {
  position: relative;
  z-index: 1;
  width: 82%;
  height: auto;
  mix-blend-mode: darken;
  animation: float 7s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* ---------------- 指标条 ---------------- */

.metric-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.metric-strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 30px 0;
}

.metric-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 4px 26px;
  border-left: 1px solid var(--line);
}

.metric-item:first-child {
  border-left: 0;
  padding-left: 0;
}

.metric-item .mi-icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: rgba(47, 124, 246, 0.08);
  color: var(--brand);
  flex: none;
}

.metric-item .mi-icon .icon {
  width: 20px;
  height: 20px;
}

.metric-item strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
}

.metric-item span {
  display: block;
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.5;
}

/* ---------------- 产品 ---------------- */

.product-section {
  background:
    radial-gradient(760px 360px at 50% 6%, #f0f6ff 0%, rgba(240, 246, 255, 0) 72%),
    #fff;
}

.product-solo {
  max-width: 980px;
  margin: 0 auto;
  text-align: center;
}

.product-solo h2 {
  max-width: 720px;
  margin: 14px auto 16px;
  font-size: clamp(1.75rem, 3.1vw, 2.6rem);
  line-height: 1.22;
  letter-spacing: -0.025em;
}

.product-solo .product-lead {
  max-width: 640px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.product-panel {
  margin-top: 46px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #fff;
  box-shadow: 0 40px 80px -64px rgba(13, 21, 38, 0.45);
  overflow: hidden;
}

.product-panel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  text-align: left;
}

.pp-item {
  padding: 30px 26px 32px;
  border-left: 1px solid var(--line);
  transition: background-color 0.2s var(--ease);
}

.pp-item:first-child {
  border-left: 0;
}

.pp-item:hover {
  background: #fafcff;
}

.pp-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  border-radius: 13px;
  background: linear-gradient(135deg, rgba(47, 124, 246, 0.12), rgba(28, 203, 183, 0.12));
  color: var(--brand);
}

.pp-icon .icon {
  width: 21px;
  height: 21px;
}

.pp-item h3 {
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.pp-item p {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.product-panel-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 16px;
  padding: 18px 26px;
  border-top: 1px solid var(--line);
  background: #fbfcff;
}

.pp-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted-2);
}

.product-panel-foot .chips {
  margin-top: 0;
}

.product-media {
  position: relative;
  display: grid;
  place-items: center;
  padding: 40px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 50% 40%, #ffffff 0%, #f2f7ff 62%, #eaf1fa 100%);
  border: 1px solid var(--line);
  overflow: hidden;
}

.product-media img {
  width: min(100%, 420px);
  filter: drop-shadow(0 28px 44px rgba(13, 21, 38, 0.2));
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.chip {
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  font-size: 13px;
  color: var(--ink-2);
}

.small-note {
  margin-top: 18px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted-2);
}

/* ---------------- 功能 ---------------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 30px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    border-color 0.25s var(--ease);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: #d9e3f2;
  box-shadow: var(--shadow-md);
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 20px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(47, 124, 246, 0.12), rgba(28, 203, 183, 0.12));
  color: var(--brand);
}

.feature-icon .icon {
  width: 22px;
  height: 22px;
}

.feature-card h3 {
  margin-bottom: 8px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------------- App 展示 ---------------- */

.app-section {
  position: relative;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(900px 500px at 82% 18%, rgba(47, 124, 246, 0.28) 0%, rgba(47, 124, 246, 0) 60%),
    radial-gradient(700px 460px at 10% 92%, rgba(28, 203, 183, 0.2) 0%, rgba(28, 203, 183, 0) 60%),
    #0b1220;
}

.app-grid {
  display: grid;
  grid-template-columns: 1fr 0.95fr;
  gap: 64px;
  align-items: center;
}

.app-copy .kicker {
  color: #7fd8cf;
}

.app-copy h2 {
  margin: 14px 0 18px;
  font-size: clamp(1.75rem, 3.1vw, 2.6rem);
  line-height: 1.22;
  letter-spacing: -0.025em;
}

.app-copy > p {
  font-size: 16.5px;
  line-height: 1.85;
  color: #a3b2c9;
}

.app-list {
  display: grid;
  gap: 16px;
  margin-top: 32px;
  list-style: none;
}

.app-list li {
  display: flex;
  gap: 12px;
  font-size: 15px;
  line-height: 1.7;
  color: #c9d5e6;
}

.app-list .tick {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border-radius: 50%;
  background: rgba(28, 203, 183, 0.16);
  color: #5fe0d3;
  flex: none;
}

.app-note {
  margin-top: 26px;
  font-size: 12.5px;
  color: #7d8da6;
}

.phone-wrap {
  position: relative;
  display: flex;
  justify-content: center;
}

.phone {
  position: relative;
  width: 300px;
  padding: 10px;
  border-radius: 46px;
  background: linear-gradient(160deg, #2a3548, #0a0f19 55%);
  box-shadow: 0 60px 100px -40px rgba(0, 0, 0, 0.85),
    0 0 0 1px rgba(255, 255, 255, 0.1);
}

.phone-screen {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 574px;
  padding: 40px 16px 12px;
  border-radius: 37px;
  background: linear-gradient(180deg, #101b2e 0%, #0a1220 100%);
  overflow: hidden;
}

.phone-screen::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 12px;
  width: 76px;
  height: 20px;
  border-radius: 999px;
  background: #05080f;
  transform: translateX(-50%);
}

.screen-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 11px;
  color: #8fa1bb;
}

.screen-top strong {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
}

.score-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
}

.donut {
  display: grid;
  place-items: center;
  width: 82px;
  height: 82px;
  border-radius: 50%;
  background: conic-gradient(#1ccbb7 0 86%, rgba(255, 255, 255, 0.1) 86% 100%);
  flex: none;
}

.donut i {
  display: grid;
  place-items: center;
  width: 66px;
  height: 66px;
  border-radius: 50%;
  background: #101b2e;
  font-style: normal;
  font-size: 23px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.score-card dl {
  margin: 0;
}

.score-card dt {
  font-size: 11.5px;
  color: #8fa1bb;
}

.score-card dd {
  margin: 2px 0 6px;
  font-size: 15px;
  font-weight: 600;
}

.score-card .tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(28, 203, 183, 0.16);
  color: #5fe0d3;
  font-size: 10.5px;
}

.mini-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.mini-card {
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
}

.mini-card span {
  display: block;
  font-size: 10.5px;
  color: #8fa1bb;
}

.mini-card strong {
  display: block;
  margin-top: 4px;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.mini-card strong small {
  font-size: 10px;
  font-weight: 500;
  color: #8fa1bb;
  margin-left: 2px;
}

.spark {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 26px;
  margin-top: 10px;
}

.spark i {
  width: 100%;
  border-radius: 2px;
  background: linear-gradient(180deg, #3f8cf8, rgba(63, 140, 248, 0.25));
}

.mini-card.warm .spark i {
  background: linear-gradient(180deg, #1ccbb7, rgba(28, 203, 183, 0.25));
}

.sleep-bars {
  padding: 14px 16px 16px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
}

.sleep-bars .sb-head {
  display: flex;
  justify-content: space-between;
  font-size: 10.5px;
  color: #8fa1bb;
}

.bars {
  display: flex;
  align-items: flex-end;
  gap: 5px;
  height: 46px;
  margin-top: 10px;
}

.bars i {
  flex: 1;
  border-radius: 3px;
  background: linear-gradient(180deg, #6fa8ff, rgba(111, 168, 255, 0.2));
}

.bars i.deep {
  background: linear-gradient(180deg, #1ccbb7, rgba(28, 203, 183, 0.2));
}

.screen-tabbar {
  display: flex;
  justify-content: space-around;
  margin-top: auto;
  padding: 10px 0 4px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.screen-tabbar span {
  display: grid;
  gap: 3px;
  justify-items: center;
  font-size: 9px;
  color: #6d7f99;
}

.screen-tabbar span.active {
  color: #56d9cd;
}

.screen-tabbar svg {
  width: 16px;
  height: 16px;
}

/* ---------------- 使用步骤 ---------------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.step {
  padding-top: 22px;
  border-top: 1px solid var(--line-strong);
}

.step-num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--brand);
}

.step h3 {
  margin: 12px 0 8px;
  font-size: 16.5px;
  font-weight: 600;
}

.step p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------------- 规格 ---------------- */

.spec-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.spec-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
}

.spec-table th,
.spec-table td {
  padding: 17px 22px;
  text-align: left;
  vertical-align: top;
  font-size: 14.5px;
  line-height: 1.7;
  border-bottom: 1px solid var(--line);
}

.spec-table th {
  width: 30%;
  font-weight: 600;
  color: var(--ink-2);
  background: #fafbfe;
  white-space: nowrap;
}

.spec-table td {
  color: var(--muted);
}

.spec-table tr:last-child th,
.spec-table tr:last-child td {
  border-bottom: 0;
}

/* ---------------- 关于我们 ---------------- */

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

.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: start;
}

.about-grid h2 {
  margin: 14px 0 18px;
  font-size: clamp(1.7rem, 2.8vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.about-grid p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--muted);
}

.about-grid p + p {
  margin-top: 14px;
}

.info-list {
  display: grid;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
}

.info-row {
  display: grid;
  grid-template-columns: 104px 1fr;
  gap: 16px;
  padding: 16px 22px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.info-row:last-child {
  border-bottom: 0;
}

.info-row dt {
  color: var(--muted);
}

.info-row dd {
  margin: 0;
  color: var(--ink-2);
  word-break: break-word;
}

.info-row dd a {
  color: var(--brand);
  text-decoration: none;
}

.info-row dd a:hover {
  text-decoration: underline;
}

/* ---------------- 下载 ---------------- */

.cta-panel {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 44px;
  align-items: center;
  padding: 56px;
  border-radius: var(--radius-lg);
  color: #fff;
  background:
    radial-gradient(600px 340px at 88% 0%, rgba(47, 124, 246, 0.4) 0%, rgba(47, 124, 246, 0) 62%),
    radial-gradient(520px 320px at 4% 100%, rgba(28, 203, 183, 0.32) 0%, rgba(28, 203, 183, 0) 62%),
    linear-gradient(120deg, #0c1729, #102a3f 60%, #0f3a3c);
  box-shadow: 0 40px 80px -50px rgba(13, 21, 38, 0.7);
}

.cta-panel h2 {
  margin: 12px 0 14px;
  font-size: clamp(1.7rem, 2.8vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.cta-panel p {
  font-size: 15.5px;
  line-height: 1.85;
  color: #b7c5d9;
}

.cta-panel .kicker {
  color: #7fd8cf;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.download-list {
  display: grid;
  gap: 12px;
}

.download-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.06);
  text-decoration: none;
  color: #fff;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

a.download-item:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.26);
  transform: translateY(-2px);
}

.download-item .di-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.1);
  flex: none;
}

.download-item .di-icon .icon {
  width: 20px;
  height: 20px;
}

.download-item > div {
  flex: 1;
  min-width: 0;
}

.download-item strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
}

.download-item span {
  display: block;
  font-size: 12.5px;
  color: #a8b8cf;
}

.download-item .di-tag {
  margin-left: auto;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 11px;
  color: #d7e2f1;
  white-space: nowrap;
}

/* ---------------- FAQ ---------------- */

.faq {
  max-width: 840px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 21px 4px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--line);
  font-size: 15px;
  font-weight: 400;
  color: var(--muted);
  flex: none;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease);
}

.faq details[open] summary::after {
  content: "−";
  background: var(--bg-soft);
  transform: rotate(180deg);
}

.faq details p {
  padding: 0 44px 22px 4px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.faq details p a {
  color: var(--brand);
  text-decoration: none;
}

.faq details p a:hover {
  text-decoration: underline;
}

.faq-more {
  margin-top: 28px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
}

.faq-more a {
  color: var(--brand);
  font-weight: 600;
  text-decoration: none;
}

/* ---------------- 页脚 ---------------- */

.site-footer {
  padding: 68px 0 28px;
  background: #0b1220;
  color: #93a2b8;
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr 1.2fr;
  gap: 36px;
}

.footer-brand .brand {
  color: #fff;
}

.footer-brand p {
  max-width: 30em;
  margin-top: 16px;
  font-size: 13.5px;
  line-height: 1.85;
  color: #8b9cb4;
}

.footer-title {
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
}

.footer-links {
  display: grid;
  gap: 4px;
}

.footer-links a {
  display: inline-block;
  padding: 4px 0;
  color: #8b9cb4;
  font-size: 13.5px;
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.footer-links a:hover {
  color: #fff;
}

.footer-contact {
  display: grid;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: #8b9cb4;
}

.footer-contact a {
  color: #cfdcee;
  text-decoration: none;
}

.footer-contact a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12.5px;
  color: #6c7c95;
}

.footer-bottom a {
  color: #8b9cb4;
  text-decoration: none;
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------------- 内页 ---------------- */

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 62px 0 44px;
  background:
    radial-gradient(800px 380px at 88% 0%, #eaf3ff 0%, rgba(234, 243, 255, 0) 64%),
    radial-gradient(640px 320px at 0% 100%, #e8fbf8 0%, rgba(232, 251, 248, 0) 62%),
    #fff;
  border-bottom: 1px solid var(--line);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--ink);
}

.page-hero h1 {
  margin: 16px 0 12px;
  font-size: clamp(1.9rem, 3.8vw, 2.9rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.page-hero p {
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.legal-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 56px;
  padding: 56px 0 96px;
  align-items: start;
}

.toc {
  position: sticky;
  top: calc(var(--header-h) + 28px);
  display: grid;
  gap: 2px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfcfe;
}

.toc strong {
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

.toc a {
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-2);
  text-decoration: none;
}

.toc a:hover {
  background: #fff;
  color: var(--brand);
}

.prose {
  max-width: 820px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-2);
}

.prose .meta {
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--muted);
}

.prose .lead {
  margin-top: 18px;
  padding: 16px 20px;
  border-left: 3px solid var(--brand);
  border-radius: 0 12px 12px 0;
  background: #f7faff;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

.prose h2 {
  margin: 42px 0 12px;
  font-size: 20px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.prose h3 {
  margin: 28px 0 8px;
  font-size: 16px;
  color: var(--ink);
}

.prose p {
  margin: 10px 0;
}

.prose ul,
.prose ol {
  display: grid;
  gap: 8px;
  margin: 12px 0;
  padding-left: 22px;
}

.prose li::marker {
  color: var(--muted-2);
}

.prose strong {
  color: var(--ink);
  font-weight: 600;
}

.prose a {
  color: var(--brand);
  text-decoration: none;
}

.prose a:hover {
  text-decoration: underline;
}

.prose table {
  width: 100%;
  margin: 16px 0;
  border-collapse: collapse;
  font-size: 14px;
}

.prose th,
.prose td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: #fafbfe;
  font-weight: 600;
  color: var(--ink-2);
  white-space: nowrap;
}

/* ---------------- 支持页 ---------------- */

.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 64px;
}

.support-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.support-card .sc-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 4px;
  border-radius: 13px;
  background: rgba(47, 124, 246, 0.09);
  color: var(--brand);
}

.support-card .sc-icon .icon {
  width: 20px;
  height: 20px;
}

.support-card h3 {
  font-size: 16px;
  font-weight: 600;
}

.support-card p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.support-card a {
  color: var(--brand);
  font-weight: 600;
  text-decoration: none;
  word-break: break-all;
}

.support-card a:hover {
  text-decoration: underline;
}

.faq-group {
  margin-bottom: 44px;
}

.faq-group h2 {
  margin-bottom: 8px;
  font-size: 19px;
  letter-spacing: -0.01em;
}

/* ---------------- 关于页 ---------------- */

.about-hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
  padding: 64px 0;
}

.about-hero-grid h1 {
  margin: 14px 0 18px;
  font-size: clamp(1.9rem, 3.8vw, 2.9rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.about-hero-grid p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--muted);
}

.about-hero-grid .product-media img {
  mix-blend-mode: multiply;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.value-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.value-card .value-num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--brand);
}

.value-card h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 600;
}

.value-card p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.statement {
  max-width: 860px;
  padding: 28px 30px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: #fbfcfe;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--ink-2);
}

/* ---------------- 动效 ---------------- */

.reveal {
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}

.js .reveal {
  opacity: 0;
  transform: translateY(18px);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------------- 响应式 ---------------- */

@media (max-width: 1024px) {
  .hero-grid,
  .app-grid,
  .about-grid,
  .spec-grid,
  .cta-panel,
  .about-hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .hero {
    padding-top: 48px;
  }

  .hero-visual {
    order: 2;
  }

  .feature-grid,
  .support-grid,
  .value-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .cta-panel {
    padding: 44px;
  }

  .legal-layout {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 0 80px;
  }

  .toc {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 14px;
  }

  .toc strong {
    width: 100%;
    margin-bottom: 2px;
  }

  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .product-panel-grid {
    grid-template-columns: 1fr 1fr;
  }

  .pp-item {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .pp-item:nth-child(-n + 2) {
    border-top: 0;
  }

  .pp-item:nth-child(even) {
    border-left: 1px solid var(--line);
  }
}

@media (max-width: 960px) {
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 55;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 12px 20px 20px;
    border-bottom: 1px solid var(--line);
    background: #fff;
    box-shadow: 0 30px 50px -30px rgba(13, 21, 38, 0.45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
      visibility 0.22s;
  }

  .nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav a {
    padding: 14px 12px;
    border-radius: 12px;
    font-size: 16px;
  }

  .nav-toggle {
    display: block;
  }
}

@media (max-width: 720px) {
  :root {
    --header-h: 64px;
  }

  .section {
    padding: 70px 0;
  }

  .container {
    padding: 0 20px;
  }

  .hero {
    padding: 40px 0 60px;
  }

  .hero h1 {
    font-size: clamp(2.1rem, 9vw, 2.9rem);
  }

  .hero-lead {
    font-size: 15.5px;
  }

  .hero-cta .btn {
    flex: 1 1 auto;
  }

  .hero-stage {
    width: min(100%, 400px);
  }

  .metric-strip-inner {
    grid-template-columns: 1fr 1fr;
    gap: 18px 0;
    padding: 24px 0;
  }

  .metric-item {
    padding: 0 16px;
  }

  .metric-item:nth-child(odd) {
    border-left: 0;
    padding-left: 0;
  }

  .metric-item:nth-child(3),
  .metric-item:nth-child(4) {
    padding-top: 18px;
    border-top: 1px solid var(--line);
  }

  .feature-grid,
  .support-grid,
  .value-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .product-panel {
    margin-top: 36px;
  }

  .pp-item {
    padding: 24px 20px;
  }

  .product-panel-foot {
    padding: 16px 20px;
  }

  .product-media {
    padding: 24px;
    border-radius: 24px;
  }

  .cta-panel {
    padding: 32px 24px;
    border-radius: 24px;
  }

  .cta-actions .btn {
    flex: 1 1 auto;
  }

  .phone {
    width: 280px;
  }

  .phone-screen {
    min-height: 548px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-contact {
    grid-column: 1 / -1;
  }

  .footer-grid > div:nth-child(4) {
    grid-column: 1 / -1;
  }

  .page-hero {
    padding: 44px 0 32px;
  }

  .toc {
    display: none;
  }

  .footer-bottom {
    flex-direction: column;
  }

  .section-head {
    margin-bottom: 36px;
  }

  .info-row {
    grid-template-columns: 88px 1fr;
    padding: 14px 18px;
  }

  /* 规格表在窄屏改为卡片式，避免横向溢出 */
  .table-wrap {
    overflow: visible;
    border: 0;
    background: transparent;
  }

  .spec-table {
    min-width: 0;
    border-collapse: separate;
    border-spacing: 0 10px;
  }

  .spec-table tbody,
  .spec-table tr {
    display: block;
  }

  .spec-table tr {
    padding: 14px 18px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
  }

  .spec-table th,
  .spec-table td {
    display: block;
    width: auto;
    padding: 0;
    border: 0;
    background: transparent;
    white-space: normal;
  }

  .spec-table th {
    font-size: 12px;
    color: var(--muted);
  }

  .spec-table td {
    padding-top: 3px;
    font-size: 14.5px;
    color: var(--ink-2);
  }

  .download-item {
    padding: 14px;
  }

  .download-item strong {
    font-size: 14px;
  }

  .download-item .di-tag {
    padding: 3px 8px;
  }
}

@media (max-width: 600px) {
  .product-panel-grid {
    grid-template-columns: 1fr;
  }

  .pp-item,
  .pp-item:nth-child(even) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .pp-item:first-child {
    border-top: 0;
  }
}

@media (max-width: 420px) {
  .header-actions .btn {
    display: none;
  }

  .download-item .di-tag {
    display: none;
  }

  .hero-cta .btn {
    width: 100%;
  }

}

/* ---------------- 打印 & 减动效 ---------------- */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

@media print {
  .site-header,
  .site-footer,
  .toc,
  .hero-cta {
    display: none;
  }

  .legal-layout {
    display: block;
    padding: 0;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}