/* ==========================================================================
   Stretchly 中国官网 - 共享样式表
   配色：Logo 红橙 #D81E00 + 极简黑 + 干净白
   风格：扁平现代专业 / 无圆角过度 / 无 emoji 图标
   ========================================================================== */

/* -------- 设计变量 -------- */
:root {
  /* 品牌色（取自 Logo）*/
  --color-brand: #D81E00;
  --color-brand-dark: #B01800;
  --color-brand-darker: #8A1300;
  --color-brand-light: #FF5A3C;
  --color-brand-soft: #FFE7E1;
  --color-brand-bg: #FFF4F1;

  /* 中性色 */
  --color-ink: #14161A;       /* 主文字 */
  --color-ink-2: #3A3F47;     /* 次级文字 */
  --color-ink-3: #6B7280;     /* 辅助文字 */
  --color-ink-4: #9CA3AF;     /* 弱化文字 */
  --color-line: #E6E8EC;      /* 分割线/边框 */
  --color-line-2: #F0F1F4;
  --color-bg: #FFFFFF;
  --color-bg-soft: #F8F9FB;
  --color-bg-dark: #0F1115;
  --color-bg-dark-2: #181B21;

  /* 功能色 */
  --color-success: #1F9D55;
  --color-warning: #C77700;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Roboto Mono", Menlo,
    Consolas, "Liberation Mono", monospace;

  /* 间距 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-pill: 999px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(20, 22, 26, 0.04);
  --shadow-md: 0 4px 14px rgba(20, 22, 26, 0.06);
  --shadow-lg: 0 14px 40px rgba(20, 22, 26, 0.10);
  --shadow-brand: 0 10px 30px rgba(216, 30, 0, 0.22);

  /* 容器 */
  --container-max: 1180px;
  --container-narrow: 880px;

  /* 过渡 */
  --t-fast: 120ms ease;
  --t-base: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* -------- 基础重置 -------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-brand);
  text-decoration: none;
  transition: color var(--t-fast);
}
a:hover { color: var(--color-brand-dark); }

button { font-family: inherit; cursor: pointer; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

p { margin: 0; }

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

/* -------- 容器与栅格 -------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding: var(--space-9) 0; }
.section--sm { padding: var(--space-8) 0; }
.section--tight { padding: var(--space-7) 0; }

.section--soft { background: var(--color-bg-soft); }
.section--dark {
  background: var(--color-bg-dark);
  color: #E6E8EC;
}
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: #fff; }
.section--dark p { color: #B6BAC2; }

/* -------- 顶部导航 -------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-line-2);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--color-ink); }
.brand__logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  flex-shrink: 0;
}
.brand__logo svg { width: 18px; height: 18px; }
.brand__name { line-height: 1; }
.brand__name small {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--color-ink-3);
  letter-spacing: 0.04em;
  margin-top: 2px;
}

.nav { display: flex; align-items: center; gap: var(--space-2); }
.nav__link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--color-ink-2);
  border-radius: var(--radius-md);
  transition: color var(--t-fast), background var(--t-fast);
}
.nav__link:hover { color: var(--color-ink); background: var(--color-bg-soft); }
.nav__link--active { color: var(--color-brand); background: var(--color-brand-bg); }

.nav__cta {
  margin-left: var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 38px;
  padding: 0 16px;
  background: var(--color-ink);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  transition: background var(--t-fast), transform var(--t-fast);
}
.nav__cta:hover { background: #000; color: #fff; transform: translateY(-1px); }
.nav__cta svg { width: 14px; height: 14px; }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-line);
  background: #fff;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 20px; height: 20px; }

@media (max-width: 880px) {
  .nav, .nav__cta { display: none; }
  .nav--open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-line);
    padding: var(--space-4) var(--space-5) var(--space-5);
    gap: var(--space-1);
    box-shadow: var(--shadow-md);
  }
  .nav--open .nav__link { padding: 12px 14px; }
  .nav--open .nav__cta { display: inline-flex; margin: 8px 0 0; }
  .nav-toggle { display: inline-flex; }
}

/* -------- 按钮 -------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: transform var(--t-fast), background var(--t-fast),
    box-shadow var(--t-fast), border-color var(--t-fast), color var(--t-fast);
  text-align: center;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn--primary {
  background: var(--color-brand);
  color: #fff;
  box-shadow: var(--shadow-brand);
}
.btn--primary:hover {
  background: var(--color-brand-dark);
  color: #fff;
  transform: translateY(-2px);
}
.btn--dark { background: var(--color-ink); color: #fff; }
.btn--dark:hover { background: #000; color: #fff; transform: translateY(-2px); }
.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn--ghost:hover {
  border-color: var(--color-ink);
  background: var(--color-bg-soft);
}
.btn--light {
  background: #fff;
  color: var(--color-ink);
}
.btn--light:hover {
  background: #F2F3F5;
  transform: translateY(-2px);
}
.btn--lg { height: 56px; padding: 0 32px; font-size: 16px; }
.btn--sm { height: 38px; padding: 0 16px; font-size: 14px; }
.btn--block { width: 100%; }

/* -------- 通用文字/标签 -------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-brand);
  background: var(--color-brand-bg);
  border-radius: var(--radius-pill);
}
.eyebrow--light {
  color: #FFB3A8;
  background: rgba(255, 255, 255, 0.08);
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.lead {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-ink-2);
}
.section--dark .lead { color: #B6BAC2; }

.text-muted { color: var(--color-ink-3); }
.text-brand { color: var(--color-brand); }

.section-title {
  font-size: clamp(28px, 3.4vw, 40px);
  margin-bottom: var(--space-3);
}
.section-subtitle {
  font-size: 17px;
  color: var(--color-ink-3);
  max-width: 640px;
}
.section--dark .section-subtitle { color: #9CA3AF; }

.section-head {
  max-width: 720px;
  margin-bottom: var(--space-8);
}
.section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.section-head--center .section-subtitle { margin-left: auto; margin-right: auto; }

/* -------- 网格 -------- */
.grid { display: grid; gap: var(--space-5); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* -------- 卡片 -------- */
.card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--t-base), box-shadow var(--t-base),
    border-color var(--t-base);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card--soft { background: var(--color-bg-soft); border-color: transparent; }
.card--flat { background: #fff; border-color: var(--color-line); }
.card--flat:hover { transform: none; box-shadow: var(--shadow-md); }

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--color-brand-bg);
  color: var(--color-brand);
  display: grid;
  place-items: center;
  margin-bottom: var(--space-4);
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-icon--dark {
  background: rgba(255, 90, 60, 0.12);
  color: var(--color-brand-light);
}
.card h3 {
  font-size: 18px;
  margin-bottom: var(--space-2);
}
.card p { color: var(--color-ink-3); font-size: 15px; }

/* -------- Hero -------- */
.hero {
  position: relative;
  padding: var(--space-9) 0 var(--space-8);
  background: linear-gradient(180deg, #FFF6F3 0%, #FFFFFF 70%);
  overflow: hidden;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-8);
  align-items: center;
}
@media (max-width: 960px) {
  .hero__grid { grid-template-columns: 1fr; gap: var(--space-7); }
}
.hero__title {
  font-size: clamp(36px, 5.2vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: var(--space-4) 0 var(--space-5);
}
.hero__title em {
  font-style: normal;
  color: var(--color-brand);
  position: relative;
  display: inline-block;
}
.hero__title em::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0.08em;
  height: 0.18em;
  background: rgba(216, 30, 0, 0.16);
  border-radius: 4px;
  z-index: -1;
}
.hero__subtitle {
  font-size: 18px;
  color: var(--color-ink-2);
  max-width: 540px;
  margin-bottom: var(--space-6);
}
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-bottom: var(--space-6); }
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  font-size: 13.5px;
  color: var(--color-ink-3);
}
.hero__meta-item { display: inline-flex; align-items: center; gap: 6px; }
.hero__meta-item svg { width: 16px; height: 16px; color: var(--color-brand); }

.hero__visual {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-dark);
  padding: var(--space-6);
  color: #fff;
  box-shadow: var(--shadow-lg);
  min-height: 380px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(216,30,0,0.35), transparent 50%),
    radial-gradient(circle at 10% 90%, rgba(255, 90, 60, 0.18), transparent 45%);
  pointer-events: none;
}

.break-preview {
  position: relative;
  z-index: 1;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.04);
  padding: var(--space-5) var(--space-5) var(--space-6);
  backdrop-filter: blur(4px);
}
.break-preview__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  font-size: 13px;
  color: #B6BAC2;
}
.break-preview__dot {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: #fff;
}
.break-preview__dot::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-brand-light);
  box-shadow: 0 0 0 4px rgba(255, 90, 60, 0.18);
}
.break-preview__title {
  font-size: 26px;
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-3);
}
.break-preview__text { color: #C5C9D2; font-size: 15px; }
.break-progress {
  margin-top: var(--space-5);
  height: 6px;
  border-radius: 999px;
  background: rgba(255,255,255,0.10);
  overflow: hidden;
}
.break-progress__bar {
  width: 64%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-brand-light), var(--color-brand));
  border-radius: 999px;
  animation: progress 4.5s ease-in-out infinite alternate;
}
@keyframes progress {
  0% { width: 20%; }
  100% { width: 88%; }
}
.break-preview__hint {
  margin-top: var(--space-4);
  font-size: 12.5px;
  color: #8A8F99;
  text-align: center;
}

.hero__visual-foot {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-5);
  font-size: 12.5px;
  color: #9CA3AF;
}
.hero__visual-foot kbd {
  font-family: var(--font-mono);
  font-size: 11.5px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 4px;
  padding: 2px 6px;
  color: #fff;
}

/* -------- 标志条 -------- */
.logo-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-6) var(--space-7);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-line-2);
  border-bottom: 1px solid var(--color-line-2);
  color: var(--color-ink-3);
  font-size: 13.5px;
  font-weight: 500;
}
.logo-bar__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 0.02em;
}
.logo-bar__item svg { width: 18px; height: 18px; color: var(--color-ink-4); }

/* -------- 使用场景卡片 -------- */
.scenario-card {
  position: relative;
  padding: var(--space-6);
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  transition: transform var(--t-base), box-shadow var(--t-base);
  overflow: hidden;
}
.scenario-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--color-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base);
}
.scenario-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.scenario-card:hover::before { transform: scaleX(1); }
.scenario-card__icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-bg-soft);
  display: grid;
  place-items: center;
  color: var(--color-brand);
  margin-bottom: var(--space-4);
}
.scenario-card__icon svg { width: 22px; height: 22px; }
.scenario-card h3 { font-size: 17.5px; margin-bottom: var(--space-2); }
.scenario-card p { color: var(--color-ink-3); font-size: 14.5px; }
.scenario-card__tag {
  display: inline-block;
  margin-top: var(--space-4);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ink-2);
  background: var(--color-bg-soft);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

/* -------- 工作机制 -------- */
.mechanism {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}
@media (max-width: 760px) { .mechanism { grid-template-columns: 1fr; } }
.mechanism__card {
  padding: var(--space-7);
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--color-line);
  position: relative;
}
.mechanism__card--mini { background: linear-gradient(180deg, #FFF4F1 0%, #FFFFFF 60%); }
.mechanism__card--long { background: linear-gradient(180deg, #F1F3F8 0%, #FFFFFF 60%); }
.mechanism__label {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-brand);
  margin-bottom: var(--space-3);
}
.mechanism__card--long .mechanism__label { color: #4B5366; }
.mechanism__title {
  font-size: 26px;
  margin-bottom: var(--space-2);
}
.mechanism__time {
  font-size: 15px;
  color: var(--color-ink-3);
  margin-bottom: var(--space-5);
}
.mechanism__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-5);
}
.mechanism__list li {
  display: flex;
  gap: 10px;
  font-size: 14.5px;
  color: var(--color-ink-2);
  line-height: 1.55;
}
.mechanism__list li::before {
  content: "";
  flex-shrink: 0;
  margin-top: 7px;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--color-brand);
}
.mechanism__card--long .mechanism__list li::before { background: #4B5366; }

/* -------- 平台支持 -------- */
.platform-card {
  padding: var(--space-6);
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: transform var(--t-base), box-shadow var(--t-base);
}
.platform-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.platform-card__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-4);
  border-radius: 14px;
  background: var(--color-bg-soft);
  display: grid;
  place-items: center;
  color: var(--color-ink);
}
.platform-card__icon svg { width: 28px; height: 28px; }
.platform-card h3 { font-size: 17px; margin-bottom: var(--space-1); }
.platform-card p { font-size: 13.5px; color: var(--color-ink-3); margin-bottom: var(--space-3); }
.platform-card__req {
  font-size: 12px;
  color: var(--color-ink-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line-2);
}

/* -------- 数据/统计 -------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
}
.stat__num {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.stat__num em { font-style: normal; color: var(--color-brand-light); font-size: 0.6em; margin-left: 4px; vertical-align: 0.15em;}
.stat__label {
  margin-top: var(--space-2);
  font-size: 13.5px;
  color: #9CA3AF;
}

/* -------- CTA 横幅 -------- */
.cta-banner {
  background: var(--color-brand);
  color: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before, .cta-banner::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
}
.cta-banner::before { width: 320px; height: 320px; top: -120px; left: -80px; }
.cta-banner::after { width: 260px; height: 260px; bottom: -100px; right: -60px; }
.cta-banner > * { position: relative; z-index: 1; }
.cta-banner h2 { color: #fff; font-size: clamp(26px, 3.2vw, 36px); margin-bottom: var(--space-3); }
.cta-banner p { color: rgba(255,255,255,0.92); font-size: 17px; max-width: 560px; margin: 0 auto var(--space-6); }
.cta-banner .btn--light { background: #fff; color: var(--color-brand-dark); }
.cta-banner .btn--light:hover { background: #FFF4F1; }

/* -------- 页脚 -------- */
.site-footer {
  background: var(--color-bg-dark);
  color: #9CA3AF;
  padding: var(--space-8) 0 var(--space-6);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: var(--space-6);
  padding-bottom: var(--space-7);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
@media (max-width: 760px) {
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .site-footer__grid { grid-template-columns: 1fr; }
}
.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-3);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
}
.site-footer__brand .brand__logo { background: var(--color-brand); }
.site-footer__desc { font-size: 14px; line-height: 1.7; max-width: 320px; }
.site-footer h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}
.site-footer ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.site-footer a { color: #9CA3AF; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  padding-top: var(--space-5);
  font-size: 13px;
  color: #6B7280;
}
.site-footer__bottom a { color: #6B7280; }
.site-footer__bottom a:hover { color: #fff; }
.site-footer__icp { display: inline-flex; align-items: center; gap: 6px; }

/* -------- 下载弹窗 -------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}
.modal--open { display: flex;   left: 0;
  right: 0;
  top: 0;
  bottom: 0;}
button { outline: none } 
.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 17, 21, 0.62);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fadeIn 200ms ease;
}
.modal__panel {
  position: relative;
  width: 100%;
  max-width: 560px;
  background: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-7);
  box-shadow: var(--shadow-lg);
  animation: popIn 240ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes popIn {
  from { opacity: 0; transform: translateY(12px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--color-ink-3);
  transition: background var(--t-fast), color var(--t-fast);
}
.modal__close:hover { background: var(--color-bg-soft); color: var(--color-ink); }
.modal__close svg { width: 18px; height: 18px; }
.modal__title { font-size: 22px; margin-bottom: var(--space-2); }
.modal__desc { color: var(--color-ink-3); font-size: 14.5px; margin-bottom: var(--space-5); }

.qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
@media (max-width: 480px) { .qr-grid { grid-template-columns: 1fr; } }
.qr-item {
  text-align: center;
  padding: var(--space-5) var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-bg-soft);
  transition: border-color var(--t-fast), background var(--t-fast);
}
.qr-item:hover { border-color: var(--color-brand); background: var(--color-brand-bg); }
.qr-item__img {
  width: 168px;
  height: 168px;
  margin: 0 auto var(--space-3);
  background: #fff;
  border-radius: var(--radius-md);
  padding: 8px;
  border: 1px solid var(--color-line);
}
.qr-item__img img { width: 100%; height: 100%; object-fit: contain; }
.qr-item__name { font-size: 14px; font-weight: 700; color: var(--color-ink); }
.qr-item__hint { font-size: 12px; color: var(--color-ink-3); margin-top: 4px; }
.modal__tips {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: var(--space-4);
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--color-ink-2);
}
.modal__tips li { display: flex; gap: 8px; }
.modal__tips li::before {
  content: "";
  flex-shrink: 0;
  width: 6px; height: 6px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--color-brand);
}
.modal__tips strong { color: var(--color-ink); }

/* -------- 引用/题词块 -------- */
.quote {
  padding: var(--space-6);
  background: #fff;
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-brand);
  border-radius: var(--radius-md);
}
.quote__text { font-size: 17px; line-height: 1.7; color: var(--color-ink); }
.quote__cite {
  display: block;
  margin-top: var(--space-3);
  font-size: 14px;
  color: var(--color-ink-3);
  font-style: normal;
}
.quote__cite strong { color: var(--color-ink-2); }

/* -------- 代码块 -------- */
.code-block {
  background: var(--color-bg-dark);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.65;
  color: #E6E8EC;
  border: 1px solid #20242C;
}
.code-block__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid #20242C;
  font-size: 12px;
  color: #6B7280;
  font-family: var(--font-sans);
}
.code-block__head span { display: inline-flex; align-items: center; gap: 6px; }
.code-block__head .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--color-brand);
}
.code-block pre { margin: 0; white-space: pre-wrap; word-break: break-word; }
.code-block code { color: inherit; }
.code-block .c-key { color: #FF8B6B; }
.code-block .c-str { color: #B3D7FF; }
.code-block .c-com { color: #6B7280; font-style: italic; }
.code-block .c-num { color: #FFD07A; }

/* 内联代码 */
code.inline {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  color: var(--color-ink);
}

/* -------- 表格 -------- */
.table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.table th, .table td {
  padding: 14px var(--space-4);
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-line-2);
}
.table th {
  background: var(--color-bg-soft);
  font-weight: 600;
  color: var(--color-ink-2);
  font-size: 13px;
  letter-spacing: 0.02em;
}
.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: #FAFBFC; }
.table code { font-family: var(--font-mono); font-size: 13px; color: var(--color-brand-dark); }

/* -------- 时间线 -------- */
.timeline {
  position: relative;
  padding-left: var(--space-6);
}
.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 6px; bottom: 6px;
  width: 2px;
  background: var(--color-line);
}
.timeline__item {
  position: relative;
  padding-bottom: var(--space-6);
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -28px; top: 4px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--color-brand);
}
.timeline__date {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-brand);
  letter-spacing: 0.02em;
}
.timeline__title { font-size: 17px; font-weight: 600; margin: 4px 0 6px; }
.timeline__text { font-size: 14.5px; color: var(--color-ink-3); }

/* -------- FAQ 折叠 -------- */
.faq {
  border-top: 1px solid var(--color-line);
}
.faq__item {
  border-bottom: 1px solid var(--color-line);
}
.faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  width: 100%;
  padding: var(--space-5) 0;
  background: transparent;
  border: none;
  text-align: left;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
}
.faq__q svg {
  flex-shrink: 0;
  width: 20px; height: 20px;
  color: var(--color-ink-3);
  transition: transform var(--t-base);
}
.faq__item--open .faq__q svg { transform: rotate(45deg); color: var(--color-brand); }
.faq__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--t-base), padding var(--t-base);
  color: var(--color-ink-2);
  font-size: 15px;
  line-height: 1.75;
}
.faq__item--open .faq__a {
  max-height: 800px;
  padding-bottom: var(--space-5);
}

/* -------- 步骤 -------- */
.steps { display: flex; flex-direction: column; gap: var(--space-6); }
.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--space-5);
  align-items: start;
}
.step__num {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--color-brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 18px;
  font-variant-numeric: tabular-nums;
}
.step__body h3 { font-size: 18px; margin-bottom: var(--space-2); }
.step__body p { color: var(--color-ink-3); font-size: 15px; }
.step__body .code-block { margin-top: var(--space-3); }

/* -------- 两栏 -------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-7);
  align-items: start;
}
@media (max-width: 880px) { .split { grid-template-columns: 1fr; } }

/* -------- 通知条 -------- */
.notice {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-brand-bg);
  border: 1px solid var(--color-brand-soft);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-ink-2);
}
.notice svg { width: 18px; height: 18px; color: var(--color-brand); flex-shrink: 0; }
.notice strong { color: var(--color-brand-dark); }

/* -------- 工具类 -------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-7 { margin-top: var(--space-7); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-7 { margin-bottom: var(--space-7); }
.mb-8 { margin-bottom: var(--space-8); }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }

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

/* -------- 滚动到顶部 -------- */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--color-ink);
  color: #fff;
  display: grid;
  place-items: center;
  border: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-base), transform var(--t-base);
  z-index: 90;
}
.to-top--show { opacity: 1; pointer-events: auto; }
.to-top:hover { transform: translateY(-3px); background: #000; }
.to-top svg { width: 20px; height: 20px; }

/* -------- 面包屑 -------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--color-ink-3);
  padding: var(--space-4) 0;
}
.breadcrumb a { color: var(--color-ink-3); }
.breadcrumb a:hover { color: var(--color-brand); }
.breadcrumb__sep { color: var(--color-ink-4); }
.breadcrumb__current { color: var(--color-ink); font-weight: 500; }

/* -------- 页面通用 hero（内页） -------- */
.page-hero {
  padding: var(--space-8) 0 var(--space-7);
  background: linear-gradient(180deg, #FFF6F3 0%, #FFFFFF 80%);
  border-bottom: 1px solid var(--color-line-2);
}
.page-hero__title {
  font-size: clamp(32px, 4.4vw, 48px);
  margin: var(--space-3) 0 var(--space-4);
}
.page-hero__lead {
  font-size: 18px;
  color: var(--color-ink-2);
  max-width: 680px;
}

/* -------- 平台卡片增强（下载页） -------- */
.dl-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--t-base), box-shadow var(--t-base), transform var(--t-base);
  display: flex;
  flex-direction: column;
}
.dl-card:hover {
  border-color: var(--color-brand);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.dl-card__head {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.dl-card__icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--color-bg-soft);
  display: grid;
  place-items: center;
  color: var(--color-ink);
  flex-shrink: 0;
}
.dl-card__icon svg { width: 30px; height: 30px; }
.dl-card__title { font-size: 20px; margin-bottom: 2px; }
.dl-card__meta { font-size: 13px; color: var(--color-ink-3); }
.dl-card__body { flex: 1; }
.dl-card__body h4 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-ink-3); margin: var(--space-4) 0 var(--space-2); font-weight: 600; }
.dl-card__list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.dl-card__list li {
  font-size: 14px;
  color: var(--color-ink-2);
  display: flex;
  align-items: center;
  gap: 8px;
  line-height: 1.55;
}
.dl-card__list li svg { width: 16px; height: 16px; color: var(--color-brand); flex-shrink: 0; }
.dl-card__foot { margin-top: var(--space-5); display: flex; flex-direction: column; gap: var(--space-2); }
.dl-card__req {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line-2);
  font-size: 12.5px;
  color: var(--color-ink-3);
}

/* -------- 选中文字 -------- */
::selection { background: var(--color-brand); color: #fff; }

/* -------- 减少动画偏好 -------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}