/* ============================================================
   重庆庆德堂中医连锁诊所 — Design System
   Color Tokens: Nature Distilled + Traditional Chinese Medicine
   Typography: Noto Serif TC (headings) + Noto Sans TC (body)
   ============================================================ */

/* --- Google Fonts --- */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Primary: 朱砂红 muted for healthcare */
  --color-primary:       #B8433A;
  --color-primary-hover: #9A352D;
  --color-primary-light: #F2D5D2;
  --color-primary-50:    #FDF6F5;

  /* Secondary: 暖金色 */
  --color-secondary:       #C5954B;
  --color-secondary-hover: #A67C38;
  --color-secondary-light: #FBF3E5;

  /* Accent: 苍绿 (herbal green) */
  --color-accent:       #5D7B4F;
  --color-accent-hover: #4A6340;
  --color-accent-light: #E8F0E4;

  /* Backgrounds */
  --color-bg:         #FEF9F0;
  --color-bg-alt:     #F7EFE2;
  --color-bg-warm:    #FDF5EC;

  /* Surfaces */
  --color-card:       #FFFFFF;
  --color-card-hover: #FFFAF5;

  /* Text */
  --color-text:         #3C2415;
  --color-text-strong:  #2D1A0E;
  --color-text-muted:   #7A6B5D;
  --color-text-light:   #A89888;

  /* Borders & Dividers */
  --color-border:       #E8D5C0;
  --color-border-light: #F0E3D5;

  /* Shadows */
  --shadow-sm:   0 1px 2px rgba(60, 36, 21, 0.06);
  --shadow-md:   0 4px 12px rgba(60, 36, 21, 0.08);
  --shadow-lg:   0 8px 30px rgba(60, 36, 21, 0.10);
  --shadow-xl:   0 16px 48px rgba(60, 36, 21, 0.12);

  /* Typography */
  --font-heading: 'Noto Serif TC', 'Songti SC', 'STSong', serif;
  --font-body:    'Noto Sans TC', 'PingFang TC', 'Microsoft YaHei', sans-serif;

  /* Spacing Scale (4px base) */
  --space-1:  0.25rem;  /* 4px  */
  --space-2:  0.5rem;   /* 8px  */
  --space-3:  0.75rem;  /* 12px */
  --space-4:  1rem;     /* 16px */
  --space-5:  1.25rem;  /* 20px */
  --space-6:  1.5rem;   /* 24px */
  --space-8:  2rem;     /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-text-strong);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p { margin-bottom: var(--space-4); }

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

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

/* --- Focus --- */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.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;
}

/* --- Section Pattern --- */
.section {
  padding: var(--space-20) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-4);
  position: relative;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  max-width: 600px;
  margin: 0 auto var(--space-12) auto;
}

/* Decorative divider after section titles */
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  margin: var(--space-4) auto 0;
  border-radius: 2px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  min-height: 48px;
  min-width: 44px;
  text-decoration: none;
}

.btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

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

.btn-secondary {
  background-color: var(--color-secondary);
  color: #FFFFFF;
  border-color: var(--color-secondary);
}
.btn-secondary:hover {
  background-color: var(--color-secondary-hover);
  border-color: var(--color-secondary-hover);
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: transparent;
}
.btn-ghost:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-primary);
}

.btn-sm {
  padding: var(--space-2) var(--space-5);
  font-size: 0.875rem;
  min-height: 40px;
}

.btn-lg {
  padding: var(--space-4) var(--space-10);
  font-size: 1.125rem;
  min-height: 56px;
}

/* --- Cards --- */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--color-secondary-light);
}

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

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: 9999px;
  line-height: 1.5;
}

.badge-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-secondary {
  background-color: var(--color-secondary-light);
  color: var(--color-secondary-hover);
}

.badge-accent {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text-strong);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
}

.nav-logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-size: 1.25rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-links a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.9375rem;
  text-decoration: none;
  padding: var(--space-1) 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

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

/* Mobile menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  min-width: 44px;
  min-height: 44px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero --- */
.hero {
  padding: 160px 0 var(--space-20);
  background: linear-gradient(
    180deg,
    var(--color-bg-warm) 0%,
    var(--color-bg) 40%,
    var(--color-bg-alt) 100%
  );
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-primary-light) 0%, transparent 70%);
  opacity: 0.3;
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-secondary-light) 0%, transparent 70%);
  opacity: 0.25;
  border-radius: 50%;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 650px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: var(--space-2) var(--space-4);
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-6);
}

.hero h1 {
  margin-bottom: var(--space-6);
  letter-spacing: 0.02em;
}

.hero p {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-10);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* --- Footer --- */
.footer {
  background: var(--color-text-strong);
  color: rgba(255, 255, 255, 0.75);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer h4 {
  color: #FFFFFF;
  font-family: var(--font-heading);
  margin-bottom: var(--space-6);
  font-size: 1.125rem;
}

.footer a {
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-size: 0.9375rem;
  line-height: 2.2;
}

.footer a:hover {
  color: var(--color-secondary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-8);
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.45);
}

/* --- Page Header (subpages) --- */
.page-header {
  padding: 140px 0 var(--space-12);
  background: linear-gradient(180deg, var(--color-bg-warm) 0%, var(--color-bg) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-primary-light) 0%, transparent 70%);
  opacity: 0.2;
  border-radius: 50%;
  pointer-events: none;
}

.page-header .container {
  position: relative;
  z-index: 1;
}

.page-header h1 {
  margin-bottom: var(--space-4);
}

.page-header .breadcrumb {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.page-header .breadcrumb a {
  color: var(--color-text-muted);
}
.page-header .breadcrumb a:hover {
  color: var(--color-primary);
}

.page-header .breadcrumb span {
  margin: 0 var(--space-2);
  color: var(--color-text-light);
}

/* --- Stats --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
}

.stat-item {
  text-align: center;
  padding: var(--space-6);
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-label {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-top: var(--space-2);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: var(--space-8);
    gap: var(--space-2);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    opacity: 0;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
  }
  .nav-links a {
    padding: var(--space-3) 0;
    font-size: 1.0625rem;
    border-bottom: none;
  }
  .nav-toggle {
    display: flex;
  }
  .section {
    padding: var(--space-12) 0;
  }
  .hero {
    padding: 120px 0 var(--space-12);
  }
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  .page-header {
    padding: 120px 0 var(--space-8);
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}