/* ==========================================================================
   花岗岩官网 v3 — 现代科技企业风格
   在 v2 的色板与克制秩序之上，叠加网格、光晕、玻璃与微动效。
   字体全部同源自托管（见 fonts.css），不请求任何外部 CDN。
   ========================================================================== */

:root {
  /* 品牌色 */
  --navy: #1a2942;
  --navy-soft: #2c3e50;
  --navy-deep: #0e1726;
  /* 浅色背景上的正文一律用纯黑，保证最高可读性 */
  --ink: #000000;
  --gold: #8b7d6b;
  --gold-light: #b8a488;

  /* 状态色 */
  --success: #205448;
  --warning: #a66321;
  --error: #a3333e;

  /* 中性色 */
  --bg: #f5f2eb;
  --bg-alt: #f5f3ef;
  --surface: #ffffff;
  --border: #d1cbc0;
  --divider: #eae6e0;
  --muted: #6b7280;
  --placeholder: #e5e5e5;

  /* 形状与阴影 */
  --radius: 4px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(14, 23, 38, 0.06);
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 16px 40px -20px rgba(14, 23, 38, 0.28);
  --shadow-lg: 0 40px 80px -32px rgba(14, 23, 38, 0.36);

  /* 字体 */
  --serif: "Instrument Serif", "Songti SC", serif;
  --sans: "DM Sans", "Noto Sans SC", -apple-system, "PingFang SC",
    "Microsoft YaHei", sans-serif;

  --maxw: 1120px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: -0.01em;
}

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

p {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
}

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

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--navy);
  color: #fff;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
  left: 0;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease),
    box-shadow 0.18s var(--ease);
}

.btn-primary {
  background: var(--navy);
  color: #fff;
  box-shadow: 0 1px 2px rgba(14, 23, 38, 0.16);
}

.btn-primary:hover {
  background: var(--navy-soft);
  transform: translateY(-1px);
  box-shadow: 0 10px 24px -12px rgba(14, 23, 38, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
  border-color: rgba(26, 41, 66, 0.28);
}

.btn-outline:hover {
  background: rgba(26, 41, 66, 0.05);
  border-color: var(--navy);
}

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

.btn-light:hover {
  background: var(--gold-light);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 14px 30px -16px rgba(0, 0, 0, 0.6);
}

.btn-lg {
  padding: 15px 30px;
  font-size: 16px;
}

.btn-sm {
  padding: 9px 18px;
  font-size: 14px;
}

.btn-note {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 7px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  color: #fff;
  transition: background 0.24s var(--ease), box-shadow 0.24s var(--ease),
    backdrop-filter 0.24s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(20, 33, 53, 0.86);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), 0 12px 32px -24px rgba(0, 0, 0, 0.9);
}

.nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--gold-light), var(--gold));
  display: grid;
  place-items: center;
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  flex: 0 0 auto;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #fff;
}

.brand-en {
  font-family: var(--serif);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: rgba(255, 255, 255, 0.44);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 15px;
}

.nav-links a {
  position: relative;
  color: rgba(255, 255, 255, 0.76);
  padding: 4px 0;
  transition: color 0.18s var(--ease);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--gold-light);
  transition: right 0.24s var(--ease);
}

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

.nav-links a:hover::after,
.nav-links a.is-active::after {
  right: 0;
}

.nav-links a.is-active {
  color: #fff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0 9px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 1.5px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.24s var(--ease), opacity 0.18s var(--ease);
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 76px 0 64px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(26, 41, 66, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 41, 66, 0.045) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, #000 10%, transparent 72%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, #000 10%, transparent 72%);
}

.hero-bg::after {
  content: "";
  position: absolute;
  top: -280px;
  right: -120px;
  width: 720px;
  height: 720px;
  background: radial-gradient(circle, rgba(139, 125, 107, 0.16), transparent 62%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 6px 14px 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(32, 84, 72, 0.16);
}

.hero h1 {
  font-size: clamp(34px, 4.6vw, 56px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: normal;
  color: var(--gold);
  background-image: linear-gradient(
    to top,
    rgba(139, 125, 107, 0.22),
    rgba(139, 125, 107, 0) 52%
  );
}

.hero-lead {
  max-width: 32em;
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 22px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
}

.hero-tags li {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  font-size: 13px;
  color: var(--ink);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero-hint {
  margin-top: 16px;
  font-size: 13px;
  color: var(--ink);
}

/* Hero 视觉：纯 CSS 手机 + 浮动卡片 */

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  padding: 8px 0;
}

.phone {
  position: relative;
  width: 292px;
  padding: 11px;
  border-radius: 34px;
  background: linear-gradient(160deg, #33445f, #16223a 55%);
  box-shadow: var(--shadow-lg);
}

.phone::before {
  content: "";
  position: absolute;
  top: 5px;
  left: 50%;
  transform: translateX(-50%);
  width: 88px;
  height: 5px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
}

.phone-screen {
  display: flex;
  flex-direction: column;
  border-radius: 24px;
  background: var(--bg-alt);
  overflow: hidden;
  height: 540px;
}

.phone-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px 4px;
  font-size: 11px;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.phone-status-icons {
  font-size: 7px;
  letter-spacing: 2px;
  color: var(--ink);
}

.phone-app {
  flex: 1;
  padding: 14px 16px 10px;
  overflow: hidden;
}

.phone-top {
  display: flex;
  align-items: center;
  gap: 8px;
}

.phone-logo {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--gold);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  display: grid;
  place-items: center;
}

.phone-appname {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.phone-slogan {
  margin: 14px 0 4px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.phone-tip {
  font-size: 11px;
  color: var(--ink);
}

.phone-cta {
  margin: 14px 0 12px;
  padding: 10px;
  border-radius: var(--radius);
  background: var(--navy);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  text-align: center;
}

.phone-quota {
  margin-bottom: 14px;
}

.phone-quota-bar {
  display: block;
  height: 4px;
  border-radius: 999px;
  background: rgba(26, 41, 66, 0.1);
  overflow: hidden;
}

.phone-quota-bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--navy);
}

.phone-quota-text {
  display: block;
  margin-top: 6px;
  font-size: 10px;
  color: var(--ink);
}

.phone-recent {
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
}

.phone-row {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 10px;
}

.phone-row + .phone-row {
  border-top: 1px solid var(--divider);
}

.phone-thumb {
  width: 26px;
  height: 26px;
  border-radius: 3px;
  background: var(--placeholder);
  flex: 0 0 auto;
}

.phone-row-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.phone-row-main b {
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.phone-row-main i {
  font-style: normal;
  font-size: 9px;
  color: var(--ink);
}

.phone-tabbar {
  display: flex;
  border-top: 1px solid rgba(26, 41, 66, 0.08);
  background: var(--surface);
}

.phone-tabbar span {
  flex: 1;
  padding: 10px 0 12px;
  text-align: center;
  font-size: 10px;
  color: var(--ink);
}

.phone-tabbar span.is-active {
  color: var(--gold);
  font-weight: 600;
}

/* 状态胶囊 */

.pill {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 999px;
  font-size: 9px;
  font-weight: 500;
  white-space: nowrap;
  flex: 0 0 auto;
}

.pill-ok {
  color: var(--success);
  background: rgba(32, 84, 72, 0.1);
}

.pill-warn {
  color: var(--warning);
  background: rgba(166, 99, 33, 0.12);
}

.pill-error {
  color: var(--error);
  background: rgba(163, 51, 62, 0.1);
}

/* 浮动卡片 */

.float-card {
  position: absolute;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 12px 14px;
  font-size: 12px;
  color: var(--ink);
}

.float-card--upload {
  left: -24px;
  top: 126px;
  width: 148px;
}

.float-card-head {
  display: block;
  font-size: 11px;
  color: var(--ink);
}

.float-card-value {
  display: block;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.float-card-bar {
  display: block;
  height: 4px;
  margin: 8px 0 7px;
  border-radius: 999px;
  background: rgba(26, 41, 66, 0.1);
  overflow: hidden;
}

.float-card-bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
}

.float-card-meta {
  display: block;
  font-size: 10px;
  color: var(--ink);
}

.float-card--safe {
  right: -10px;
  bottom: 108px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.float-card--safe b {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.float-card-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(32, 84, 72, 0.14);
  flex: 0 0 auto;
}

/* 进度条宽度类（避免内联样式，便于走严格 CSP） */

.bar-23 {
  width: 23%;
}

.bar-62 {
  width: 62%;
}

/* Hero 指标 */

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 60px 0 0;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.hero-stat {
  background: rgba(255, 255, 255, 0.66);
  padding: 20px 22px;
}

.hero-stat dt {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  line-height: 1.15;
}

.hero-stat dt span {
  margin-left: 3px;
  font-size: 15px;
  font-weight: 500;
  color: var(--gold);
}

.hero-stat dd {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--ink);
}

/* ---------- 通用区块 ---------- */

.section {
  padding: 84px 0;
}

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

.section-head {
  max-width: 42em;
  margin-bottom: 44px;
}

.section-label {
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.section-label--light {
  color: var(--gold-light);
}

.section-head h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-sub {
  font-size: 16px;
  color: var(--ink);
}

/* 深色区块 */

.section-dark {
  position: relative;
  background: var(--navy-deep);
  color: #fff;
  overflow: hidden;
}

.section-dark::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000, transparent 75%);
}

.section-dark::after {
  content: "";
  position: absolute;
  top: -320px;
  left: 50%;
  width: 900px;
  height: 700px;
  transform: translateX(-50%);
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle, rgba(139, 125, 107, 0.2), transparent 64%);
}

.section-dark > .container {
  position: relative;
  z-index: 1;
}

.section-dark .section-head h2 {
  color: #fff;
}

.section-dark .section-sub {
  color: rgba(255, 255, 255, 0.68);
}

/* 滚动显现 */

/* 渐进增强：默认全部可见；仅当脚本就绪（html.js-anim）时才隐藏待入场元素。
   这样禁用 JS 或脚本加载失败时，所有内容仍然完整可读。 */
.reveal {
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.js-anim .reveal {
  opacity: 0;
  transform: translateY(16px);
}

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

/* 卡片 */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease),
    border-color 0.24s var(--ease);
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(139, 125, 107, 0.5);
  box-shadow: var(--shadow-md);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

/* 功能卡 */

.feature-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  border-radius: var(--radius);
  background: rgba(26, 41, 66, 0.05);
  border: 1px solid rgba(26, 41, 66, 0.06);
  color: var(--ink);
}

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

.feature h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature p {
  font-size: 15px;
  color: var(--ink);
}

.security-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.security-card p {
  font-size: 14px;
  color: var(--ink);
}

/* ---------- 适用人群 ---------- */

.audience {
  padding: 40px 0 44px;
}

.audience-label {
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 20px;
}

.audience-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.audience-list li {
  padding: 8px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  color: var(--ink);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.audience-list li:hover {
  border-color: var(--gold);
  color: var(--ink);
}

/* ---------- 备份库 ---------- */

.tabs {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
}

.tab {
  padding: 9px 20px;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.tab[aria-selected="true"] {
  background: var(--navy);
  color: #fff;
}

.tab[aria-selected="false"]:hover {
  color: var(--ink);
}

.tab-panel:focus-visible {
  outline-offset: 6px;
}

.library-panel {
  max-width: 780px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.library-month {
  padding: 14px 22px 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 22px;
  transition: background 0.18s var(--ease);
}

.row + .row,
.library-month + .row {
  border-top: 1px solid var(--divider);
}

.row:hover {
  background: #fbfaf7;
}

.row-thumb {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  background: var(--placeholder);
  flex: 0 0 auto;
}

.row-folder {
  position: relative;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  background: rgba(139, 125, 107, 0.14);
  flex: 0 0 auto;
}

.row-folder::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16px;
  height: 11px;
  transform: translate(-50%, -50%);
  border: 1.5px solid var(--gold);
  border-radius: 2px;
}

.row-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.row-name {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.row-meta {
  font-size: 13px;
  color: var(--ink);
}

.row-side {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.row-side .pill {
  font-size: 12px;
  padding: 3px 10px;
}

.row-pack {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(26, 41, 66, 0.06);
  color: var(--ink);
}

.row-chevron {
  font-size: 20px;
  line-height: 1;
  color: var(--border);
  flex: 0 0 auto;
}

.library-note {
  max-width: 780px;
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink);
}

/* ---------- 技术架构 ---------- */

.tech-layout {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 48px;
  align-items: center;
}

.tech-diagram {
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  background: linear-gradient(
    165deg,
    rgba(255, 255, 255, 0.07),
    rgba(255, 255, 255, 0.015)
  );
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.tech-figure {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.tech-points {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.tech-points li {
  display: flex;
  gap: 18px;
}

.tech-no {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.3;
  color: var(--gold-light);
  flex: 0 0 auto;
}

.tech-points h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.tech-points p {
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.66);
}

/* ---------- 工作流程 ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: 26px;
  border-top: 2px solid var(--divider);
}

.step::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--gold);
}

.step-no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1;
  color: var(--gold);
}

.step h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

/* ---------- 数据一览 ---------- */

.stats-band {
  padding: 60px 0;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-block b {
  display: block;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: #fff;
}

.stat-block span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- 常见问题 ---------- */

.faq-wrap {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 48px;
  align-items: start;
}

.faq-wrap .section-head {
  margin-bottom: 0;
  position: sticky;
  top: 96px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.2s var(--ease);
}

.faq-item[open] {
  border-color: rgba(139, 125, 107, 0.5);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 22px;
  font-size: 15.5px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "";
  width: 11px;
  height: 11px;
  flex: 0 0 auto;
  border-right: 1.6px solid var(--gold);
  border-bottom: 1.6px solid var(--gold);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.24s var(--ease);
}

.faq-item[open] summary::after {
  transform: rotate(225deg) translate(-2px, -2px);
}

.faq-body {
  padding: 0 22px 20px;
}

.faq-body p {
  font-size: 14.5px;
  color: var(--ink);
}

/* ---------- 下载 ---------- */

.download {
  position: relative;
  background: var(--navy);
  color: #fff;
  padding: 76px 0;
  overflow: hidden;
}

.download-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse 70% 80% at 80% 50%, #000, transparent 70%);
  mask-image: radial-gradient(ellipse 70% 80% at 80% 50%, #000, transparent 70%);
}

.download-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 48px;
  align-items: center;
}

.download h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.download-lead {
  max-width: 34em;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 26px;
}

.download-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
}

.download-meta li {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.86);
  font-variant-numeric: tabular-nums;
}

.download-meta span {
  display: block;
  margin-bottom: 2px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.42);
}

.download-action {
  text-align: right;
}

.download-action .btn {
  width: 100%;
}

.download-hint {
  margin-top: 12px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

/* ---------- 页脚 ---------- */

.site-footer {
  background: var(--navy-deep);
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 48px;
  padding: 56px 24px 40px;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.footer-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #fff;
}

.footer-slogan {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.48);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h3 {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.42);
}

.footer-col li {
  padding: 4px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.66);
}

.footer-col a {
  transition: color 0.18s var(--ease);
}

.footer-col a:hover {
  color: var(--gold-light);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 20px 24px 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.44);
}

.footer-icp a {
  transition: color 0.18s var(--ease);
}

.footer-icp a:hover {
  color: var(--gold-light);
}

/* ---------- 响应式 ---------- */

@media (max-width: 1024px) {
  .hero-inner,
  .tech-layout,
  .download-inner {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 22px;
  }

  .hero-visual {
    order: 2;
  }

  .float-card--upload {
    left: 8%;
  }

  .float-card--safe {
    right: 8%;
  }

  .tech-layout {
    align-items: start;
  }

  .faq-wrap {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .faq-wrap .section-head {
    position: static;
  }

  .download-action {
    text-align: left;
  }

  .download-action .btn {
    width: auto;
  }

  .download-hint {
    text-align: left;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

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

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 24px 14px;
    background: var(--navy);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 24px 40px -28px rgba(0, 0, 0, 0.9);
    display: none;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    padding: 13px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 16px;
  }

  .nav-links a::after {
    display: none;
  }

  .site-header.is-scrolled .nav-links {
    background: rgba(20, 33, 53, 0.98);
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 52px 0 48px;
  }

  .section,
  .download {
    padding: 56px 0;
  }

  .grid-3,
  .grid-4,
  .steps {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    margin-top: 44px;
  }

  .hero-stat {
    padding: 16px 18px;
  }

  .hero-stat dt {
    font-size: 24px;
  }

  .phone {
    width: 262px;
  }

  .phone-screen {
    height: 496px;
  }

  .float-card--upload {
    left: -4px;
    top: 98px;
    width: 132px;
    padding: 10px 12px;
  }

  .float-card--safe {
    right: -4px;
    bottom: 84px;
    font-size: 11px;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px 16px;
  }

  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .row-side .row-pack {
    display: none;
  }

  .card {
    padding: 22px 20px;
  }
}

/* 尊重系统的「减少动态效果」设置 */

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

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

  .reveal,
  .js-anim .reveal {
    opacity: 1;
    transform: none;
  }
}