/* ============================================
   食辰 (Shichen) — 共享设计系统样式表
   被 index.html、隐私政策页、用户协议页共同引用
   ============================================ */

/* ------------------------------------------
   1. CSS 变量 (Design Tokens)
   ------------------------------------------ */
:root {
  --bg: #FFFBF5;
  --surface: #FFFFFF;
  --primary: #FF9B71;
  --primary-hover: #E8865E;
  --primary-light: #FFF7F3;
  --text-primary: #3D2C2C;
  --text-secondary: #8B7E74;
  --border: #F0E6DC;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 100px;
  --shadow: 0 2px 12px rgba(61, 44, 44, 0.06);
  --shadow-hover: 0 8px 32px rgba(61, 44, 44, 0.10);
  --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 800px;
}

/* ------------------------------------------
   2. CSS Reset & 基础排版
   ------------------------------------------ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-hover);
}

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

.text-secondary {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.5;
}

/* ------------------------------------------
   3. 布局容器
   ------------------------------------------ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ------------------------------------------
   4. Hero — 首屏
   ------------------------------------------ */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 0 40px;
  position: relative;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg) 100%);
}

.hero-egg {
  display: inline-block;
  font-size: 80px;
  margin-bottom: 32px;
  animation: bounce 2.4s ease infinite;
}

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-sub {
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1.6;
  margin-bottom: 48px;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 20px;
  color: var(--text-secondary);
  opacity: 0.4;
  animation: scrollPulse 2s ease infinite;
}

/* ------------------------------------------
   5. CTA 按钮
   ------------------------------------------ */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 52px;
  padding: 0 36px;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-cta:hover {
  background: var(--primary-hover);
  color: #fff;
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.btn-cta-lg {
  height: 60px;
  padding: 0 48px;
  font-size: 18px;
}

/* btn-text for legal pages */
.btn-text {
  display: inline-flex;
  align-items: center;
  background: none;
  border: none;
  color: var(--primary);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  padding: 8px 4px;
  transition: color 0.2s ease;
  text-decoration: none;
}

.btn-text:hover {
  color: var(--primary-hover);
}

/* keep legacy class for any shared usage */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 14px 32px;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: #fff;
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}

/* ------------------------------------------
   6. 痛点共鸣
   ------------------------------------------ */
.section-pain {
  padding: 100px 0;
  text-align: center;
}

.pain-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 48px;
}

.pain-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 480px;
  margin: 0 auto;
}

.pain-list li {
  font-size: 17px;
  line-height: 1.6;
  color: var(--text-secondary);
  text-align: left;
}

/* ------------------------------------------
   7. 核心卖点
   ------------------------------------------ */
.section-value {
  padding: 100px 0;
}

.value-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.value-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 40px 32px;
  text-align: center;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.value-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.value-emoji {
  font-size: 48px;
  margin-bottom: 20px;
}

.value-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.value-card p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 0;
}

/* ------------------------------------------
   8. 下载 CTA
   ------------------------------------------ */
.section-cta {
  padding: 120px 0;
  text-align: center;
  background: linear-gradient(180deg, var(--bg) 0%, var(--primary-light) 50%, var(--bg) 100%);
}

.section-cta h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 40px;
}

.cta-note {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 20px;
  margin-bottom: 0;
}

/* ------------------------------------------
   9. 页脚
   ------------------------------------------ */
.footer {
  background: var(--text-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: 40px 0;
  font-size: 14px;
}

.footer .container {
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  transition: color 0.2s ease;
}

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

.footer-links .separator {
  color: rgba(255, 255, 255, 0.3);
}

.footer-copyright {
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
  line-height: 1.6;
}

.footer-copyright p {
  margin-bottom: 4px;
}

.footer-copyright a {
  color: rgba(255, 255, 255, 0.6);
}

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

/* ------------------------------------------
   10. 协议页面专用样式
   ------------------------------------------ */
.legal-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.legal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.legal-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.nav-logo:hover {
  color: var(--primary);
}

.legal-header .nav-logo {
  font-size: 20px;
}

.legal-back {
  color: var(--text-secondary);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.2s ease;
}

.legal-back:hover {
  color: var(--primary);
}

.legal-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 80px;
  flex: 1;
}

.legal-content h1 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 8px;
}

.legal-content .legal-date {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 32px;
}

.legal-content h2 {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.35;
  margin-top: 32px;
  margin-bottom: 12px;
}

.legal-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
}

.legal-content p {
  margin-bottom: 1em;
  color: var(--text-primary);
  line-height: 1.8;
}

.legal-content ul,
.legal-content ol {
  margin-bottom: 1em;
  padding-left: 2em;
}

.legal-content li {
  margin-bottom: 0.5em;
  line-height: 1.7;
}

.legal-content strong {
  font-weight: 600;
}

/* ------------------------------------------
   11. 动画
   ------------------------------------------ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.15; transform: translateX(-50%) translateY(8px); }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in-up-delay-1 {
  animation: fadeInUp 0.6s ease 0.15s forwards;
  opacity: 0;
}

.fade-in-up-delay-2 {
  animation: fadeInUp 0.6s ease 0.3s forwards;
  opacity: 0;
}

.fade-in-up-delay-3 {
  animation: fadeInUp 0.6s ease 0.45s forwards;
  opacity: 0;
}

/* ------------------------------------------
   12. 响应式 — 平板 (≥768px)
   ------------------------------------------ */
@media (min-width: 768px) {
  .hero h1 {
    font-size: 48px;
  }

  .hero-sub {
    font-size: 20px;
  }

  .hero-egg {
    font-size: 96px;
  }

  .pain-title {
    font-size: 34px;
  }

  .pain-list li {
    font-size: 18px;
    text-align: center;
  }

  .value-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .section-cta h2 {
    font-size: 36px;
  }
}

/* ------------------------------------------
   13. 响应式 — 桌面 (≥1024px)
   ------------------------------------------ */
@media (min-width: 1024px) {
  .hero h1 {
    font-size: 56px;
  }

  .hero-sub {
    font-size: 22px;
    max-width: 480px;
  }

  .value-grid {
    gap: 40px;
  }

  .value-card {
    padding: 48px 36px;
  }
}

/* ------------------------------------------
   14. 移动端 (<768px)
   ------------------------------------------ */
@media (max-width: 767px) {
  .legal-content {
    padding: 0 16px 60px;
  }

  .legal-content h1 {
    font-size: 24px;
  }

  .legal-header {
    margin-bottom: 24px;
  }

  .section-pain {
    padding: 80px 0;
  }

  .section-value {
    padding: 80px 0;
  }

  .section-cta {
    padding: 80px 0;
  }
}