/**
 * 盒宝快记 · 苹果官网风格工业级设计系统
 * 移动端优先（Mobile First）重构 · 彻底消灭任何横向溢出与布局撕裂
 * 铁律：绝对禁止任何上下浮动/漂浮动效，所有元素稳稳落定
 * 铁律：绝对禁止任何 Emoji，全量采用精工矢量 SVG
 * 铁律：绝对禁止副标题与眉标胶囊（Eyebrow）
 * 铁律：移动端所有卡片单列布局，彻底消除屏幕挤压
 */

:root {
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  
  --bg-white: #ffffff;
  --bg-light: #f5f5f7;
  --bg-dark: #000000;
  --bg-dark-card: #161617;
  --bg-dark-card-hover: #1f1f23;
  
  --text-dark-title: #1d1d1f;
  --text-dark-sub: #86868b;
  --text-dark-body: #424245;
  
  --text-light-title: #f5f5f7;
  --text-light-sub: #a1a1a6;
  --text-light-body: #86868b;
  
  --accent-apple-blue: #0071e3;
  --accent-apple-hover: #0077ed;
  
  --nav-height: 48px;
  --container-width: 1040px;
  --container-narrow: 820px;
  
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 24px;
  
  --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html, body {
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
  position: relative;
  font-family: var(--font-display);
  background-color: var(--bg-white);
  color: var(--text-dark-title);
  scroll-behavior: smooth;
  font-size: 16px;
  line-height: 1.5;
}

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

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

/* ================= 苹果顶部全局毛玻璃导航 ================= */
.apple-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  z-index: 1000;
  transition: background-color 0.3s var(--ease-apple), border-color 0.3s var(--ease-apple);
}

.apple-nav.nav-dark {
  background: rgba(0, 0, 0, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.apple-nav-content {
  max-width: var(--container-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand-group {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
}

.nav-brand-group img {
  width: 26px;
  height: 26px;
  border-radius: 6px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 12px;
  color: var(--text-dark-sub);
  white-space: nowrap;
  transition: color 0.2s var(--ease-apple);
}

.nav-links a:hover {
  color: var(--text-dark-title);
}

.apple-nav.nav-dark .nav-brand-group,
.apple-nav.nav-dark .nav-links a:hover {
  color: var(--text-light-title);
}

.apple-nav.nav-dark .nav-links a {
  color: var(--text-light-sub);
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 16px;
  font-size: 12px;
  font-weight: 500;
  background-color: var(--accent-apple-blue);
  color: #ffffff;
  border-radius: 980px;
  white-space: nowrap;
  transition: background-color 0.2s var(--ease-apple), transform 0.2s var(--ease-apple);
}

.nav-cta-btn:hover {
  background-color: var(--accent-apple-hover);
  transform: scale(1.02);
}

/* ================= 苹果版式通用排版 ================= */
.apple-container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.apple-section {
  padding: 120px 0;
  position: relative;
  width: 100%;
  overflow: hidden;
}

.apple-section.dark {
  background-color: var(--bg-dark);
  color: var(--text-light-title);
}

.apple-section.light {
  background-color: var(--bg-light);
  color: var(--text-dark-title);
}

.apple-headline {
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 16px;
  text-align: center;
  word-break: break-word;
}

.apple-subhead {
  font-size: clamp(16px, 2vw, 21px);
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-dark-sub);
  max-width: 680px;
  margin: 0 auto 48px;
  text-align: center;
  word-break: break-word;
}

.apple-section.dark .apple-headline {
  color: var(--text-light-title);
}

.apple-section.dark .apple-subhead {
  color: var(--text-light-sub);
}

/* ================= 通用卡片图标容器 ================= */
.card-icon-box {
  width: 36px;
  height: 36px;
  margin-bottom: 14px;
  color: var(--accent-apple-blue);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-shrink: 0;
}

.card-icon-box.center {
  margin: 0 auto 14px;
  justify-content: center;
}

.card-icon-box.green {
  color: #34c759;
}

.card-icon-box.orange {
  color: #ff9500;
}

.card-icon-box.purple {
  color: #af52de;
}

/* ================= 1. 英雄首屏 HERO ================= */
.hero-wrapper {
  padding-top: calc(var(--nav-height) + 50px);
  padding-bottom: 90px;
  text-align: center;
  background-color: #ffffff;
  width: 100%;
  overflow: hidden;
}

.hero-showcase-container {
  max-width: 980px;
  margin: 0 auto 40px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.06);
}

.hero-showcase-img {
  width: 100%;
  height: auto;
  display: block;
}

.beta-dual-deck {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 440px;
  margin: 0 auto;
  width: 100%;
}

.beta-action-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 20px;
  background-color: var(--bg-light);
  border-radius: var(--radius-md);
  color: var(--text-dark-title);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: background-color 0.2s var(--ease-apple), transform 0.2s var(--ease-apple);
}

.beta-action-box:hover {
  background-color: #eaebee;
  transform: scale(1.02);
}

.beta-action-box.primary {
  background-color: var(--accent-apple-blue);
  color: #ffffff;
  border: none;
}

.beta-action-box.primary:hover {
  background-color: var(--accent-apple-hover);
}

.step-badge {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, 0.1);
  color: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}

.beta-action-box.primary .step-badge {
  background-color: rgba(255, 255, 255, 0.25);
}

/* ================= 2. 快捷指令（深空黑沉浸） ================= */
.shortcut-modes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
  width: 100%;
}

.shortcut-mode-card {
  background-color: var(--bg-dark-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: background-color 0.3s var(--ease-apple);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.shortcut-mode-card:hover {
  background-color: var(--bg-dark-card-hover);
}

.shortcut-card-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 16px;
  color: var(--accent-apple-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.shortcut-card-title {
  font-size: 19px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 8px;
}

.shortcut-card-text {
  font-size: 13px;
  color: var(--text-light-sub);
  line-height: 1.5;
}

/* 7 种调用通道药丸胶囊 */
.invoke-channels-strip {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.invoke-pill {
  padding: 8px 16px;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 980px;
  font-size: 13px;
  color: var(--text-light-title);
  white-space: nowrap;
}

/* 4 种 App 内部录入通道网格 */
.internal-modes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 48px;
  width: 100%;
}

.internal-mode-card {
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  transition: background-color 0.2s var(--ease-apple);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.internal-mode-card:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

.internal-card-icon {
  width: 36px;
  height: 36px;
  margin: 0 auto 12px;
  color: #34c759;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.internal-card-title {
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 6px;
}

.internal-card-desc {
  font-size: 12px;
  color: var(--text-light-sub);
  line-height: 1.45;
}

/* ================= 3. 每一笔都记得明白 ================= */
.clean-scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  width: 100%;
}

.clean-scenario-card {
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  transition: transform 0.2s var(--ease-apple), box-shadow 0.2s var(--ease-apple);
}

.clean-scenario-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.05);
}

.scenario-main-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark-title);
  margin-bottom: 10px;
}

.scenario-main-desc {
  font-size: 14px;
  color: var(--text-dark-body);
  line-height: 1.55;
}

/* ================= 4. 物品与订阅管理 ================= */
.asset-subscription-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  width: 100%;
}

.asset-subscription-card {
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
  transition: transform 0.2s var(--ease-apple);
}

.asset-subscription-card:hover {
  transform: translateY(-2px);
}

.asset-sub-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-dark-title);
  margin-bottom: 10px;
}

.asset-sub-desc {
  font-size: 14px;
  color: var(--text-dark-body);
  line-height: 1.55;
}

/* ================= 5. 全域定制纯纯粹指标 ================= */
.metrics-grid-clean {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
}

.metric-clean-card {
  background-color: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 32px 18px;
  text-align: center;
  border: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 140px;
}

.metric-clean-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-dark-title);
  line-height: 1.4;
}

.metric-clean-sub {
  font-size: 12px;
  color: var(--accent-apple-blue);
  margin-top: 4px;
}

/* ================= 6. 数据隐私（深空黑沉浸） ================= */
.privacy-four-grid-clean {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
}

.privacy-four-clean-card {
  background-color: var(--bg-dark-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 32px 18px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 140px;
}

.privacy-four-clean-text {
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  line-height: 1.4;
}

/* ================= 7. 收尾转化 & 页脚 ================= */
.footer-cta-wrapper {
  padding: 100px 0 60px;
  text-align: center;
  background-color: #ffffff;
  width: 100%;
}

.apple-footer-bottom {
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  padding: 32px 20px;
  font-size: 12px;
  color: var(--text-dark-sub);
  text-align: center;
  line-height: 1.8;
  width: 100%;
}

.footer-icp {
  color: var(--text-dark-sub);
  margin-top: 4px;
  display: inline-block;
  transition: color 0.2s var(--ease-apple);
}

.footer-icp:hover {
  color: var(--accent-apple-blue);
  text-decoration: underline;
}

.btn-apple-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 34px;
  background-color: var(--accent-apple-blue);
  color: #ffffff;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  transition: background-color 0.2s var(--ease-apple), transform 0.2s var(--ease-apple);
}

.btn-apple-primary:hover {
  background-color: var(--accent-apple-hover);
  transform: scale(1.02);
}

/* =================================================================
   移动端优先深度适配（最高优先级 · 彻底解决一切横向溢出）
   ================================================================= */
@media (max-width: 860px) {
  .nav-links {
    display: none;
  }
  
  .apple-container,
  .apple-container-narrow {
    padding: 0 16px;
    width: 100%;
    max-width: 100%;
  }
  
  .apple-section {
    padding: 70px 0;
  }
  
  .hero-wrapper {
    padding-top: calc(var(--nav-height) + 30px);
    padding-bottom: 60px;
  }
  
  .hero-showcase-container {
    margin-bottom: 28px;
    border-radius: 16px;
  }
  
  .apple-headline {
    font-size: 26px;
    line-height: 1.25;
    margin-bottom: 12px;
  }
  
  .apple-subhead {
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 32px;
    padding: 0 4px;
  }
  
  /* 移动端全量卡片彻底单列布局（1fr），绝不横向撑开 */
  .beta-dual-deck {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .shortcut-modes-grid {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-bottom: 28px;
  }
  
  .internal-modes-grid {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 32px;
  }
  
  .clean-scenario-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  
  .asset-subscription-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  
  .metrics-grid-clean {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  .privacy-four-grid-clean {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  /* 移动端卡片内边距紧凑舒适 */
  .shortcut-mode-card,
  .clean-scenario-card,
  .asset-subscription-card,
  .metric-clean-card,
  .privacy-four-clean-card {
    padding: 24px 20px;
    min-height: auto;
  }
  
  .scenario-main-title,
  .asset-sub-title {
    font-size: 18px;
    margin-bottom: 6px;
  }
  
  .scenario-main-desc,
  .asset-sub-desc {
    font-size: 13px;
    line-height: 1.5;
  }
  
  .privacy-four-clean-text {
    font-size: 14px;
  }
  
  .invoke-channels-strip {
    gap: 8px;
  }
  
  .invoke-pill {
    padding: 6px 12px;
    font-size: 12px;
  }
  
  .footer-cta-wrapper {
    padding: 60px 0 40px;
  }
  
  .btn-apple-primary {
    width: 100%;
    padding: 13px 20px;
  }
}