/* ============================================================
   养老社保 — 官方网站样式
   设计理念：温暖、专业、可信赖
   色调：暖橙 + 金色 + 深蓝，传递养老关怀感
   ============================================================ */

/* ── CSS Custom Properties ─────────────────────── */
/* 品牌色来自「暖阳社保」设计系统，与小程序端保持一致 */
:root {
  /* 主色：暖阳橙 */
  --color-primary: #F9733E;
  --color-primary-light: #FFB899;
  --color-primary-dark: #D45D2E;
  --color-primary-bg: #FFF2EB;
  --color-primary-glow: rgba(249, 115, 62, 0.18);

  /* 强调色：暖金 */
  --color-accent: #E8983C;
  --color-accent-light: #FFD6A5;
  --color-accent-bg: #FFF7ED;

  /* 辅助色：深蓝（信任感） */
  --color-trust: #1B5E84;
  --color-trust-light: #2D7FAD;
  --color-trust-bg: #F0F7FB;

  /* 文字色（暖棕色系） */
  --color-text: #3D2E23;
  --color-text-secondary: #7A6452;
  --color-text-muted: #B8A494;
  --color-text-inverse: #FFFFFF;

  /* 背景色（暖米色系） */
  --color-bg: #FBF6F0;
  --color-bg-card: #FFFFFF;
  --color-bg-warm: #FFF7F1;
  --color-bg-subtle: #F8F2EB;
  --color-border: #E8E0D8;

  /* 渐变 */
  --gradient-header: linear-gradient(165deg, #FFA575 0%, #F9733E 35%, #FFB899 100%);
  --gradient-hero: linear-gradient(165deg, #FFF7F1 0%, #FFECE0 50%, #FFF7ED 100%);
  --gradient-card: linear-gradient(135deg, #FFF7F1 0%, #FFECE0 100%);
  --gradient-cta: linear-gradient(135deg, #F9733E 0%, #E8983C 100%);
  --gradient-amber: linear-gradient(135deg, #F9733E 0%, #E8983C 100%);

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(61, 46, 35, 0.06), 0 1px 2px rgba(61, 46, 35, 0.04);
  --shadow-md: 0 4px 12px rgba(61, 46, 35, 0.06), 0 2px 4px rgba(61, 46, 35, 0.04);
  --shadow-lg: 0 12px 32px rgba(61, 46, 35, 0.08), 0 4px 8px rgba(61, 46, 35, 0.04);
  --shadow-xl: 0 20px 48px rgba(61, 46, 35, 0.10), 0 8px 16px rgba(61, 46, 35, 0.04);
  --shadow-primary: 0 4px 16px rgba(249, 115, 62, 0.3);

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 999px;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-number: "SF Mono", "Menlo", "Monaco", "Courier New", monospace;

  /* 间距 */
  --section-gap: 100px;
}

/* ── Reset & Base ──────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

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

ul { list-style: none; }

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

/* ── Container ──────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Section Shared ─────────────────────────────── */
section {
  padding: var(--section-gap) 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-badge {
  display: inline-block;
  padding: 6px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-bg);
  border-radius: 100px;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.section-badge--light {
  color: var(--color-white);
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.3);
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-title--light {
  color: var(--color-white);
}

.section-desc {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Lucide Icons ───────────────────────────────── */
.icon-inline {
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
  flex-shrink: 0;
}

.icon-sm {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.icon-xs {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

/* ── Buttons ────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn--primary {
  background: var(--gradient-cta);
  color: white;
  box-shadow: var(--shadow-primary);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(249, 115, 62, 0.4);
}

.btn--outline {
  background: var(--color-white);
  color: var(--color-primary);
  border: 2px solid var(--color-border);
}
.btn--outline:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}

.btn--block {
  display: flex;
  width: 100%;
}

/* ── Navigation ─────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(251, 246, 240, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}

.nav--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.nav__logo-icon {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.nav__links {
  display: flex;
  gap: 36px;
}

.nav__links a {
  font-size: 15px;
  color: var(--color-text-secondary);
  font-weight: 500;
  position: relative;
  transition: color 0.2s;
}
.nav__links a:hover { color: var(--color-primary); }
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: transform 0.2s;
}
.nav__links a:hover::after { transform: scaleX(1); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
}
.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ── Hero ───────────────────────────────────────── */
.hero {
  position: relative;
  padding: 140px 0 80px;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary-dark);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero__title {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero__title-accent {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  max-width: 460px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.hero__stats {
  display: flex;
  gap: 40px;
}

.hero__stat-num {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.hero__stat-label {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* Hero visual — floating cards */
.hero__visual {
  position: relative;
  height: 420px;
}

.hero__card {
  position: absolute;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 4px;
  animation: floatCard 5s ease-in-out infinite;
  transition: transform 0.3s;
}
.hero__card:hover { transform: translateY(-4px) scale(1.02); }

.hero__card-icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  margin-bottom: 4px;
  flex-shrink: 0;
}
.hero__card strong { font-size: 16px; color: var(--color-text); }
.hero__card small { font-size: 13px; color: var(--color-text-muted); }

.hero__card--1 { top: 20px; left: 0; animation-delay: 0s; }
.hero__card--2 { top: 0; right: 20px; animation-delay: 1.2s; }
.hero__card--3 { bottom: 40px; left: 40px; animation-delay: 2.4s; }
.hero__card--4 { bottom: 20px; right: 0; animation-delay: 3.6s; }

.hero__wave {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  color: var(--color-bg);
  line-height: 0;
}
.hero__wave svg { width: 100%; height: 80px; }

/* ── Features ───────────────────────────────────── */
.features__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.feature-card--highlight {
  grid-column: span 2;
  grid-row: span 2;
  background: var(--gradient-card);
  border-color: var(--color-primary);
  border-width: 2px;
}

.feature-card__icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.feature-card__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}

.feature-card__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  flex: 1;
}

.feature-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.feature-card__tags span {
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-bg);
  border-radius: 100px;
}

/* ── How It Works ────────────────────────────────── */
.how {
  background: var(--color-white);
}

.how__steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.how__step {
  text-align: center;
  flex: 0 0 220px;
  padding: 36px 24px;
}

.how__step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-white);
  background: var(--gradient-cta);
  border-radius: 50%;
  margin-bottom: 12px;
}

.how__step-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: 12px;
  flex-shrink: 0;
}

.how__step h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}

.how__step p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.how__connector {
  color: var(--color-text-muted);
  flex-shrink: 0;
  opacity: 0.4;
  display: flex;
  align-items: center;
}
.how__connector .lucide {
  width: 28px;
  height: 28px;
}

/* ── AI Section ──────────────────────────────────── */
.ai-section {
  background: var(--gradient-cta);
  color: var(--color-white);
}

.ai-section__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.ai-section__text {
  font-size: 17px;
  line-height: 1.8;
  opacity: 0.9;
  margin-bottom: 28px;
}

.ai-section__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ai-section__list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  opacity: 0.9;
}

.ai-section__list li span { font-size: 18px; flex-shrink: 0; }

/* AI Chat Mock */
.ai-chat-mock {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  color: var(--color-text);
}

.ai-chat-mock__header {
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  background: var(--gradient-cta);
  color: var(--color-white);
}

.ai-chat-mock__msg {
  margin: 16px 20px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.7;
  max-width: 85%;
}

.ai-chat-mock__msg--user {
  margin-left: auto;
  background: var(--color-primary-bg);
  color: var(--color-text);
  text-align: right;
}

.ai-chat-mock__msg--ai {
  background: #F5F7FA;
  color: var(--color-text);
}

.ai-chat-mock__input {
  margin: 16px 20px 20px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 2px dashed var(--color-border);
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* ── Pricing ────────────────────────────────────── */
.pricing {
  background: var(--color-bg-subtle);
}

.pricing__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  position: relative;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: 36px 28px 32px;
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-border);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: all 0.3s ease;
}

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

.pricing-card--popular {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.04);
}

.pricing-card--popular:hover {
  transform: scale(1.04) translateY(-4px);
}

.pricing-card__badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-cta);
  color: var(--color-white);
  padding: 4px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card__icon {
  width: 36px;
  height: 36px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.pricing-card h3 {
  font-size: 18px;
  font-weight: 700;
}

.pricing-card__price strong {
  font-size: 40px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.pricing-card__price span {
  font-size: 15px;
  color: var(--color-text-muted);
}

.pricing-card__original {
  font-size: 13px;
  color: var(--color-text-muted);
  text-decoration: line-through;
  margin-top: 6px;
}

.pricing-card__features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

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

/* ── Security ───────────────────────────────────── */
.security {
  background: var(--color-white);
}

.security__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.security-item {
  text-align: center;
  padding: 32px 20px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  transition: transform 0.3s;
}

.security-item:hover { transform: translateY(-4px); }

.security-item__icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  display: block;
  margin: 0 auto 16px;
}

.security-item h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.security-item p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ── FAQ ────────────────────────────────────────── */
.faq__list {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq__item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.3s;
}

.faq__item[open] {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.faq__item summary {
  padding: 22px 28px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.faq__item summary::after {
  content: '+';
  font-size: 20px;
  font-weight: 300;
  color: var(--color-text-muted);
  transition: transform 0.3s;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq__item[open] summary::after {
  content: '−';
  color: var(--color-primary);
}

.faq__answer {
  padding: 0 28px 24px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ── Footer ─────────────────────────────────────── */
.footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 36px;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 60px;
}

.footer__logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  display: block;
  margin-bottom: 12px;
}

.footer__brand p {
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer__copyright {
  color: rgba(255,255,255,0.35);
  font-size: 13px;
}

.footer__icp {
  margin-top: 8px;
  font-size: 13px;
}

.footer__icp a {
  color: rgba(255,255,255,0.35);
  transition: color 0.2s;
}

.footer__icp a:hover {
  color: rgba(255,255,255,0.6);
}

/* 公安备案图标 */
.gongan-icon {
  display: inline-block;
  vertical-align: middle;
  margin-right: 4px;
  position: relative;
  top: -1px;
}

.footer__icp--gongan a {
  vertical-align: middle;
}

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

.footer__col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer__col a,
.footer__col span {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.55);
  margin-bottom: 10px;
  transition: color 0.2s;
}

.footer__col a:hover { color: var(--color-accent-light); }

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 1024px) {
  :root { --section-gap: 72px; }

  .section-title { font-size: 30px; }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero__title { font-size: 40px; }
  .hero__visual { height: 320px; }
  .hero__card { padding: 16px 20px; }
  .hero__card-emoji { font-size: 26px; }
  .hero__card strong { font-size: 14px; }
  .hero__card small { font-size: 12px; }

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

  .ai-section__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .pricing__cards {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
  }
  .pricing-card--popular { transform: scale(1); }
  .pricing-card--popular:hover { transform: translateY(-4px); }
  .pricing-card__price strong { font-size: 32px; }

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

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root { --section-gap: 56px; }

  .section-title { font-size: 26px; }

  /* Mobile nav */
  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-white);
    padding: 20px 24px;
    gap: 0;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--color-border);
  }
  .nav__links--open { display: flex; }
  .nav__links a {
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 16px;
  }
  .nav__links a:last-child { border-bottom: none; }

  .nav__toggle { display: flex; }

  /* Hero */
  .hero { padding: 110px 0 60px; }
  .hero__title { font-size: 34px; }
  .hero__subtitle { font-size: 16px; }
  .hero__actions { flex-direction: column; }
  .hero__stats { gap: 28px; }
  .hero__stat-num { font-size: 24px; }

  .hero__visual { height: auto; position: static; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .hero__card { position: static; animation: none; }
  .hero__card:hover { transform: none; }

  /* Features */
  .features__grid {
    grid-template-columns: 1fr 1fr;
  }
  .feature-card--highlight { grid-column: span 2; grid-row: auto; }

  /* How */
  .how__steps {
    flex-direction: column;
  }
  .how__connector { transform: rotate(90deg); }
  .how__step { flex: 0 0 auto; }

  /* Pricing */
  .pricing__cards {
    grid-template-columns: 1fr;
    max-width: 360px;
  }
  .pricing-card--popular { transform: none; }
  .pricing-card--popular:hover { transform: translateY(-4px); }

  /* Security */
  .security__grid { grid-template-columns: 1fr; }

  /* FAQ */
  .faq__item summary { padding: 18px 20px; font-size: 15px; }
  .faq__answer { padding: 0 20px 18px; }

  /* Footer */
  .footer__links { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .hero__visual { grid-template-columns: 1fr; }
  .features__grid { grid-template-columns: 1fr; }
  .feature-card--highlight { grid-column: span 1; }
  .footer__links { grid-template-columns: 1fr; }
}

/* ── Animations ──────────────────────────────────── */
@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}