/* ============================================
   杏林保壹堂 - 企业官网共享样式
   设计风格：稳重古朴 · 正统中医药
   配色：赭石棕(药材/本草底色) + 墨草绿(草药/生机)
   中性底色：宣纸色系
   ============================================ */

/* ---- CSS 变量 ---- */
:root {
  /* 主色：赭石棕（药材、泥土、传统本草底色，中医核心色） */
  --color-primary: #7A3E30;
  --color-primary-dark: #5C2E24;
  --color-primary-light: #9A5E48;
  --color-primary-50: #F0E8E2;
  --color-primary-100: #E0D2C8;
  /* 辅助色1：墨草绿（本草、草药、生机） */
  --color-accent: #040e05;
  --color-accent-dark: #dfebe0;
  --color-accent-light: #ebf1ec;
  /* 辅助色2：浅朱砂红（仅点缀，公告、重点提示，禁止大面积） */
  --color-highlight: #C84838;
  /* 中性底色（宣纸色系） */
  --color-bg: #F8F5EF;
  --color-card-bg: #F3EDE3;
  --color-white: #ffffff;
  /* 文字 */
  --color-heading: #3A2E26;
  --color-text: #594C43;
  --color-text-light: #7A6B62;
  --color-text-muted: #948478;
  /* 分割线 / 边框 */
  --color-border: #DDD6CC;
  /* 阴影 */
  --color-card-shadow: 0 2px 12px rgba(122, 62, 48, 0.08);
  --color-card-shadow-hover: 0 8px 30px rgba(122, 62, 48, 0.15);
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  /* 过渡 */
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

/* ---- 基础重置 ---- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

ul, ol {
  list-style: none;
}

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

/* ---- 通用按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(122, 62, 48, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-gold {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-gold:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(10, 10, 9, 0.4);
}

/* ---- 导航栏 ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(248, 245, 239, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.nav-inner {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.03em;
}

.nav-logo .logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 1.1rem;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(122, 62, 48, 0.3);
}

.nav-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav-logo .logo-text .zh {
  font-size: 1.1rem;
}

.nav-logo .logo-text .en {
  font-size: 0.6rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  position: relative;
  padding: 8px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-primary);
}

.nav-menu a.active::after,
.nav-menu a:hover::after {
  width: 24px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---- 通用 section ---- */
section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 12px;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: 0.03em;
}

.section-title h2 .accent {
  color: var(--color-primary);
}

.section-subtitle {
  text-align: center;
  font-size: 1.05rem;
  color: var(--color-text-light);
  margin-bottom: 56px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 3px;
  margin: 16px auto 24px;
}

/* ---- 通用卡片 ---- */
.card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--color-card-shadow);
  transition: var(--transition);
  border: 1px solid var(--color-border);
}

.card:hover {
  box-shadow: var(--color-card-shadow-hover);
  transform: translateY(-4px);
  border-color: var(--color-primary-100);
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--color-primary-50), var(--color-primary-100));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.6rem;
}

.card-icon.gold {
  background: linear-gradient(135deg, #E8F0E5, #D5E5D0);
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-heading);
}

.card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ---- 页脚 ---- */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.85);
  padding: 60px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .nav-logo {
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.7);
  max-width: 320px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-col ul li a:hover {
  color: var(--color-accent-light);
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 12px;
}

.footer-contact li .icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.8;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
  transition: var(--transition);
}

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

/* ---- 动画 ---- */
.fade-in-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-up.delay-1 { transition-delay: 0.1s; }
.fade-in-up.delay-2 { transition-delay: 0.2s; }
.fade-in-up.delay-3 { transition-delay: 0.3s; }
.fade-in-up.delay-4 { transition-delay: 0.4s; }

/* ---- 响应式 ---- */
@media (max-width: 968px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  section {
    padding: 56px 0;
  }

  .container {
    padding: 0 20px;
  }

  .section-title h2 {
    font-size: 1.6rem;
  }

  .section-subtitle {
    font-size: 0.95rem;
    margin-bottom: 40px;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(248, 245, 239, 0.98);
    backdrop-filter: blur(12px);
    padding: 16px;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-150%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu a {
    width: 100%;
    padding: 14px 18px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-toggle {
    display: flex;
  }

  .nav-logo .logo-text .en {
    display: none;
  }

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

  .card {
    padding: 28px;
  }
}

/* ---- 滚动条美化 ---- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}