/* ============================================
   SeniorCareCostCalc.com — 全站样式表 v2.0
   老年友好无障碍设计 | WCAG 2.1 AA 标准
   主色：信任蓝 #1E40AF | 浅蓝 #60A5FA | 温暖米白 #FFFBEB
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --primary: #1E40AF;
  --primary-light: #3B82F6;
  --primary-lighter: #60A5FA;
  --primary-bg: #EFF6FF;
  --accent: #059669;
  --accent-light: #D1FAE5;
  --warm-bg: #FFFBEB;
  --white: #FFFFFF;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-500: #64748B;
  --gray-700: #334155;
  --gray-900: #0F172A;
  --danger: #DC2626;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --font-base: 1.125rem;  /* 18px 老年友好 */
  --font-sm: 1rem;       /* 16px */
  --font-lg: 1.25rem;    /* 20px */
  --touch-target: 48px;   /* WCAG 触控标准 */
}

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

html { scroll-behavior: smooth; font-size: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.8;
  font-size: var(--font-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Accessibility: Skip Link ---------- */
.skip-link {
  position: absolute; top: -100%; left: 1rem;
  background: var(--primary); color: #fff;
  padding: 0.75rem 1.5rem; border-radius: var(--radius-sm);
  z-index: 1000; font-weight: 600; font-size: var(--font-sm);
}
.skip-link:focus { top: 0.5rem; }

/* ---------- Focus Visible (键盘导航) ---------- */
:focus-visible {
  outline: 3px solid var(--primary-lighter);
  outline-offset: 2px;
  border-radius: 4px;
}
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid var(--primary-lighter);
  outline-offset: 2px;
}

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

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

/* ---------- Layout ---------- */
.container { max-width: 1140px; margin: 0 auto; padding: 0 1.5rem; }
/* ---------- Narrow Container (text-heavy sections) ---------- */
.container--narrow { max-width: 880px; margin: 0 auto; }
/* ---------- Dark Mode Toggle (Nav) ---------- */
.nav-dark-toggle {
  background: none;
  border: 2px solid var(--gray-300);
  border-radius: 50%;
  width: 36px; height: 36px;
  font-size: 1.15rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s ease;
  margin-left: 0.5rem;
  flex-shrink: 0;
}
.nav-dark-toggle:hover {
  background: #1e293b;
  border-color: #1e293b;
  transform: scale(1.1);
}

/* ---------- Dark Mode Theme ---------- */
[data-theme="dark"] {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --gray-50: #1e293b;
  --gray-100: #334155;
  --gray-200: #475569;
  --gray-300: #64748b;
  --gray-700: #cbd5e1;
  --gray-800: #e2e8f0;
  --gray-900: #f1f5f9;
  --primary-lighter: #1d4ed8;
  --primary-bg: rgba(29,78,216,0.15);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.6);
}
[data-theme="dark"] { background: var(--bg); color: var(--text); }
[data-theme="dark"] body { background: var(--bg); color: var(--text); }
[data-theme="dark"] .site-header { background: #1e293b; border-bottom-color: #334155; }
[data-theme="dark"] .site-footer { background: #0f172a; color: #94a3b8; }
[data-theme="dark"] .section { background: transparent; }
[data-theme="dark"] .calculator-box,
[data-theme="dark"] .tool-card,
[data-theme="dark"] .result-box,
[data-theme="dark"] .faq-item { background: #1e293b; border-color: #334155; color: #e2e8f0; }
[data-theme="dark"] .hero { background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%); }
[data-theme="dark"] .hero h1 { color: #f1f5f9; }
[data-theme="dark"] .hero p { color: #94a3b8; }
[data-theme="dark"] .trust-bar { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .tab-btn { color: #94a3b8; border-bottom-color: transparent; }
[data-theme="dark"] .tab-btn.active { color: #60a5fa; border-bottom-color: #3b82f6; }
[data-theme="dark"] .tab-btn:hover { color: #e2e8f0; background: rgba(59,130,246,0.1); }
[data-theme="dark"] .nav-drop-menu { background: #1e293b; border-color: #334155; box-shadow: 0 8px 24px rgba(0,0,0,0.5); }
[data-theme="dark"] .nav-drop-menu a { color: #e2e8f0; }
[data-theme="dark"] .nav-drop-menu a:hover { background: #334155; color: #60a5fa; }
[data-theme="dark"] .site-logo { color: #f1f5f9 !important; }
[data-theme="dark"] .main-nav > a { color: #e2e8f0; }
[data-theme="dark"] .main-nav > a:hover { color: #60a5fa; }
[data-theme="dark"] .form-group label { color: #cbd5e1; }
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select { background: #0f172a; border-color: #475569; color: #e2e8f0; }
[data-theme="dark"] .section-title { color: #f1f5f9; }
[data-theme="dark"] .section-subtitle { color: #94a3b8; }
[data-theme="dark"] .footer-col h4 { color: #e2e8f0; }
[data-theme="dark"] .footer-col a { color: #94a3b8; }
[data-theme="dark"] .footer-col a:hover { color: #60a5fa; }
[data-theme="dark"] .share-modal-content { background: #1e293b; }
[data-theme="dark"] .faq-question { color: #e2e8f0; background: #1e293b; }
[data-theme="dark"] .faq-answer { color: #94a3b8; }
[data-theme="dark"] .btn--primary { background: #2563eb; }
[data-theme="dark"] .back-to-top { background: #2563eb; }
[data-theme="dark"] .nav-dark-toggle { border-color: #475569; }
[data-theme="dark"] .nav-dark-toggle:hover { background: #334155; border-color: #60a5fa; }



/* ---------- Header / Nav ---------- */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.site-logo {
  font-size: 1.35rem; font-weight: 800; color: var(--primary);
  display: flex; align-items: center;
  letter-spacing: -0.02em;
}
.site-logo span { color: var(--primary-lighter); margin-left: 0; padding-left: 0; }
.site-logo::before { content: '🏠'; font-size: 1.5rem; margin-right: 0.4rem; }

.main-nav { display: flex; align-items: center; gap: 0.15rem; }
.main-nav a {
  padding: 0.6rem 0.85rem; border-radius: var(--radius-sm);
  font-size: var(--font-sm); font-weight: 600; color: var(--gray-700);
  transition: all 0.2s; white-space: nowrap;
  min-height: var(--touch-target); display: flex; align-items: center;
}
.main-nav a:hover, .main-nav a.active {
  background: var(--primary-bg); color: var(--primary);
  text-decoration: none;
}

/* ---------- Nav Dropdown ---------- */
.nav-dropdown {
  position: relative;
}
.nav-drop-toggle {
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: var(--font-sm);
  font-weight: 600;
  color: var(--gray-700);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.15rem;
  min-height: var(--touch-target);
  white-space: nowrap;
  text-decoration: none;
  transition: all 0.2s;
}
.nav-drop-toggle:hover,
.nav-drop-toggle:focus {
  background: var(--primary-bg);
  color: var(--primary);
}
.nav-drop-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  min-width: 220px;
  padding: 0.5rem 0;
  z-index: 200;
  flex-direction: column;
}
.nav-dropdown:hover .nav-drop-menu,
.nav-dropdown:focus-within .nav-drop-menu {
  display: flex;
}
.nav-drop-menu a {
  padding: 0.65rem 1.25rem;
  font-size: var(--font-sm);
  color: var(--gray-700);
  white-space: nowrap;
  transition: background 0.15s;
  border-radius: 0;
  min-height: auto;
}
.nav-drop-menu a:hover {
  background: var(--primary-bg);
  color: var(--primary);
}
@media (max-width: 900px) {
  .nav-drop-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-left: 3px solid var(--primary-light);
    margin-left: 1rem;
    padding-left: 0.5rem;
    display: none !important; /* 默认隐藏 */
  }
  .nav-dropdown.open .nav-drop-menu,
  .main-nav.open .nav-drop-menu {
    display: flex !important;
  }
  .nav-drop-toggle::after {
    content: ' ▾';
  }
}


/* 移动端导航 */
.nav-toggle {
  display: none; background: none; border: 2px solid var(--gray-300);
  cursor: pointer; padding: 0.5rem; border-radius: var(--radius-sm);
  min-width: var(--touch-target); min-height: var(--touch-target);
  align-items: center; justify-content: center; font-size: 1.5rem;
}
@media (max-width: 900px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex; flex-direction: column;
    position: absolute; top: 72px; left: 0; right: 0;
    background: var(--white); border-bottom: 2px solid var(--gray-200);
    padding: 0.5rem; box-shadow: var(--shadow-lg);
    max-height: 80vh; overflow-y: auto;
  }
  .main-nav.open a { padding: 0.85rem 1rem; font-size: var(--font-base); }
  .nav-toggle { display: flex; }
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  padding: 0.75rem 0; font-size: var(--font-sm); color: var(--gray-500);
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { color: var(--gray-500); }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 60%, var(--primary-lighter) 100%);
  color: #fff; text-align: center;
  padding: 4rem 1.5rem 3rem; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero h1 { font-size: 2.5rem; font-weight: 900; margin-bottom: 1rem; line-height: 1.2; position: relative; }
.hero p { font-size: var(--font-lg); opacity: 0.95; max-width: 680px; margin: 0 auto 2rem; line-height: 1.7; position: relative; }
.hero-cta {
  display: inline-block; background: #fff; color: var(--primary);
  padding: 1rem 2.5rem; border-radius: 50px; font-weight: 800; font-size: var(--font-base);
  transition: all 0.2s; position: relative;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.hero-cta:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,0.22); color: var(--primary); text-decoration: none; }

/* ---------- Trust Badges ---------- */
.trust-bar {
  background: var(--white); border-bottom: 1px solid var(--gray-200);
  padding: 0.75rem 0; text-align: center;
}
.trust-bar-inner {
  display: flex; align-items: center; justify-content: center; gap: 2rem; flex-wrap: wrap;
  font-size: var(--font-sm); color: var(--gray-500);
}
.trust-badge {
  display: flex; align-items: center; gap: 0.4rem; font-weight: 600;
}
.trust-badge::before { font-size: 1.2rem; }

/* ---------- Ad Banner ---------- */
.ad-banner {
  text-align: center; padding: 0.75rem 0;
  background: var(--gray-100); border-bottom: 1px solid var(--gray-200);
  min-height: 60px;
}

/* ---------- Content Sections ---------- */
.section { padding: 3rem 0; }
.section--warm { background: var(--warm-bg); }
.section-title {
  font-size: 1.75rem; font-weight: 800; color: var(--primary);
  margin-bottom: 2rem; text-align: center;
}
.section-title--left { text-align: left; }
.section-subtitle { text-align: center; color: var(--gray-500); font-size: var(--font-base); margin-top: -1rem; margin-bottom: 2rem; }

/* ---------- Tab Switch ---------- */
.tab-nav {
  display: flex; border-bottom: 3px solid var(--gray-200);
  margin-bottom: 2rem; gap: 0;
  overflow: hidden;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-btn {
  flex: 1; min-width: 200px; padding: 1rem 1.5rem; font-size: var(--font-base); font-weight: 700;
  background: none; border: none; cursor: pointer;
  color: var(--gray-500); border-bottom: 3px solid transparent;
  margin-bottom: -3px; transition: all 0.2s;
  min-height: var(--touch-target);
}
.tab-btn:hover { color: var(--primary); background: var(--primary-bg); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary-lighter); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- Calculator Box (强制包裹层) ---------- */
.calculator-box {
  padding: 2rem; border-radius: var(--radius);
  background: var(--white);
  margin: 2rem 0;
  border: 2px solid var(--gray-200);
  box-shadow: var(--shadow);
  position: relative;
}
.calculator-box::before {
  content: 'Calculator'; position: absolute; top: -12px; left: 1.5rem;
  background: var(--primary); color: #fff; font-size: 0.8rem; font-weight: 700;
  padding: 0.15rem 0.75rem; border-radius: 20px;
}

/* ---------- Form Elements (放大适配中老年) ---------- */
.form-group { margin-bottom: 1.5rem; }
.form-group label {
  display: block; font-weight: 700; font-size: var(--font-base);
  margin-bottom: 0.5rem; color: var(--gray-700);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 0.85rem 1rem; font-size: var(--font-base);
  border: 2px solid var(--gray-300); border-radius: var(--radius-sm);
  background: var(--white); color: var(--gray-900);
  transition: border-color 0.2s, box-shadow 0.2s;
  min-height: var(--touch-target);
  appearance: none; -webkit-appearance: none;
}
.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='10'%3E%3Cpath d='M1 1l6 6 6-6' stroke='%2364748B' stroke-width='2.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 3rem;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none; border-color: var(--primary-lighter);
  box-shadow: 0 0 0 4px rgba(96,165,250,0.2);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.85rem 2rem;
  font-size: var(--font-base); font-weight: 700; border: none; border-radius: var(--radius-sm);
  cursor: pointer; transition: all 0.15s; text-align: center;
  min-height: var(--touch-target);
  text-decoration: none;
}
.btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; box-shadow: 0 2px 8px rgba(30,64,175,0.3);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(30,64,175,0.35); color: #fff; text-decoration: none; }
.btn--secondary {
  background: var(--primary-bg); color: var(--primary); border: 2px solid var(--primary-lighter);
}
.btn--secondary:hover { background: #DBEAFE; text-decoration: none; }
.btn--accent { background: var(--accent); color: #fff; }
.btn--accent:hover { background: #047857; color: #fff; text-decoration: none; }
.btn--block { display: flex; width: 100%; }
.btn--sm { padding: 0.6rem 1.2rem; font-size: var(--font-sm); min-height: 40px; }

/* ---------- Result Box ---------- */
.result-box {
  margin-top: 2rem; padding: 2rem;
  background: linear-gradient(135deg, var(--primary-bg), #DBEAFE);
  border-radius: var(--radius); border: 2px solid var(--primary-lighter);
  display: none;
}
.result-box.show { display: block; animation: fadeIn 0.3s ease; }
.result-box h3 { font-size: var(--font-lg); color: var(--primary); margin-bottom: 1rem; }
.result-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.75rem 0; border-bottom: 1px solid #BFDBFE;
}
.result-row:last-child { border-bottom: none; }
.result-label { font-weight: 600; color: var(--gray-700); font-size: var(--font-base); }
.result-value { font-weight: 800; font-size: var(--font-lg); color: var(--primary); }
.result-highlight {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; padding: 1rem 1.5rem;
  border-radius: var(--radius-sm); font-size: 1.5rem; font-weight: 900;
  text-align: center; margin-top: 1.5rem;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- Tool Cards ---------- */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.5rem; }
.tool-card {
  background: var(--white); border-radius: var(--radius); padding: 2rem;
  border: 2px solid var(--gray-200); transition: all 0.2s;
  display: flex; flex-direction: column;
}
.tool-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-lighter); }
.tool-card h3 { font-size: var(--font-lg); color: var(--primary); margin-bottom: 0.75rem; }
.tool-card p { font-size: var(--font-base); color: var(--gray-500); margin-bottom: 1.25rem; flex: 1; }
.tool-card .btn { align-self: flex-start; }

/* ---------- FAQ ---------- */
.faq-item { margin-bottom: 1rem; border-radius: var(--radius-sm); overflow: hidden; border: 2px solid var(--gray-200); background: var(--white); }
.faq-question {
  width: 100%; padding: 1.25rem 1.5rem; text-align: left;
  background: var(--white); border: none; cursor: pointer;
  font-size: var(--font-base); font-weight: 700; color: var(--gray-900);
  display: flex; justify-content: space-between; align-items: center;
  min-height: var(--touch-target);
}
.faq-question::after { content: '+'; font-size: 1.5rem; color: var(--primary-lighter); font-weight: 800; transition: transform 0.2s; }
.faq-question.active::after { content: '−'; transform: rotate(180deg); }
.faq-answer { padding: 0 1.5rem 1.5rem; font-size: var(--font-base); color: var(--gray-700); display: none; line-height: 1.8; }
.faq-answer.show { display: block; animation: fadeIn 0.2s ease; }

/* ---------- Action Bar (分享/打印/收藏) ---------- */
.action-bar { display: flex; gap: 0.75rem; flex-wrap: wrap; margin: 1.5rem 0; }
.action-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.6rem 1.2rem; border-radius: 50px;
  font-size: var(--font-sm); font-weight: 600;
  border: 2px solid var(--gray-300); background: var(--white);
  cursor: pointer; transition: all 0.15s; color: var(--gray-700);
  min-height: 40px;
}
.action-btn:hover { border-color: var(--primary-lighter); color: var(--primary); background: var(--primary-bg); }
.action-btn.saved { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }
.action-btn svg { width: 18px; height: 18px; }

/* ---------- Share Modal ---------- */
.share-modal {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 1000; align-items: center; justify-content: center;
}
.share-modal.show { display: flex; }
.share-modal-content {
  background: var(--white); border-radius: var(--radius); padding: 2rem;
  max-width: 420px; width: 90%; position: relative;
}
.share-modal-close {
  position: absolute; top: 1rem; right: 1rem; background: none; border: none;
  font-size: 1.5rem; cursor: pointer; color: var(--gray-500);
  min-width: 40px; min-height: 40px; display: flex; align-items: center; justify-content: center;
}
.share-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 1.5rem; }
.share-btn {
  display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.85rem; border-radius: var(--radius-sm); font-weight: 700; font-size: var(--font-sm);
  border: none; cursor: pointer; transition: all 0.15s; color: #fff;
  min-height: var(--touch-target);
}
.share-btn--facebook { background: #1877F2; }
.share-btn--twitter { background: #1DA1F2; }
.share-btn--linkedin { background: #0A66C2; }
.share-btn--email { background: var(--gray-700); }
.share-btn--copy { background: var(--accent); }
.share-btn:hover { opacity: 0.9; transform: translateY(-1px); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--gray-900); color: var(--gray-300);
  padding: 3rem 0 2rem; margin-top: 4rem;
}
.footer-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 2rem 1.75rem; margin-bottom: 2.5rem; }
.footer-col h4 { color: #fff; font-size: var(--font-base); margin-bottom: 1rem; }
.footer-col a { display: block; color: var(--gray-500); font-size: var(--font-sm); padding: 0.35rem 0; transition: color 0.2s; }
.footer-col a:hover { color: var(--primary-lighter); text-decoration: none; }
.footer-bottom {
  border-top: 1px solid var(--gray-700); padding-top: 1.5rem;
  text-align: center; font-size: var(--font-sm); color: var(--gray-500);
}
.footer-disclaimer { font-size: 0.8rem; color: var(--gray-400); margin-top: 1rem; line-height: 1.6; }

/* ---------- Page Header ---------- */
.page-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; padding: 3rem 1.5rem; text-align: center;
}
.page-header h1 { font-size: 2rem; font-weight: 900; margin-bottom: 0.75rem; }
.page-header p { opacity: 0.92; max-width: 640px; margin: 0 auto; font-size: var(--font-base); }

/* ---------- Content Body ---------- */
.content-body { max-width: 780px; margin: 0 auto; padding: 2.5rem 1.5rem; }
.content-body h2 { font-size: 1.5rem; color: var(--primary); margin: 2.5rem 0 1.25rem; font-weight: 800; }
.content-body h3 { font-size: var(--font-lg); color: var(--gray-700); margin: 2rem 0 1rem; font-weight: 700; }
.content-body p { margin-bottom: 1.25rem; color: var(--gray-700); }
.content-body ul, .content-body ol { padding-left: 1.5rem; margin-bottom: 1.25rem; }
.content-body li { margin-bottom: 0.6rem; color: var(--gray-700); font-size: var(--font-base); }

/* ---------- Related Tools (JS auto-injected) ---------- */
#related-tools-auto,
.related-tools {
  max-width: 780px;
  margin: 2rem auto 0;
  padding: 0 1.5rem;
  box-sizing: border-box;
}
@media (max-width: 768px) {
  #related-tools-auto, .related-tools { padding: 0 1rem; }
  #related-tools-auto > div, .related-tools > div { grid-template-columns: repeat(3, 1fr) !important; gap: 0.6rem; }
}
@media (max-width: 540px) {
  #related-tools-auto > div, .related-tools > div { grid-template-columns: 1fr !important; }
}

/* ---------- Floating Action Buttons ---------- */
#fab-bar {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  z-index: 999;
}
#fab-bar button {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--primary, #1E40AF);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, box-shadow 0.15s;
}
#fab-bar button:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 16px rgba(0,0,0,0.25);
}
#fab-bar button:active { transform: scale(0.95); }
@media (max-width: 768px) {
  #fab-bar { bottom: 1.2rem; right: 1.2rem; gap: 0.5rem; }
  #fab-bar button { width: 42px; height: 42px; font-size: 1.05rem; }
}
@media print {
  #fab-bar { display: none !important; }
}

/* ---------- Table ---------- */
.data-table { width: 100%; border-collapse: collapse; margin: 2rem 0; font-size: var(--font-base); }
.data-table th {
  background: var(--primary); color: #fff; padding: 1rem 1.25rem;
  text-align: left; font-weight: 700; font-size: var(--font-base);
}
.data-table td { padding: 0.85rem 1.25rem; border-bottom: 1px solid var(--gray-200); font-size: var(--font-base); }
.data-table tr:nth-child(even) td { background: var(--gray-100); }
.data-table tr:hover td { background: var(--primary-bg); }

/* ---------- Chart Container ---------- */
.chart-container { position: relative; height: 320px; margin: 2rem 0; }

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  background: var(--primary); color: #fff;
  width: 52px; height: 52px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md); cursor: pointer;
  opacity: 0; visibility: hidden; transition: all 0.3s;
  border: none; font-size: 1.25rem;
  z-index: 99;
}
.back-to-top.show { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--primary-light); transform: translateY(-3px); }

/* ---------- Print Styles ---------- */
@media print {
  .ad-banner, .site-header, .site-footer,
  .action-bar, .back-to-top, .trust-bar,
  .share-modal, .nav-toggle, .toast { display: none !important; }
  .calculator-box { border: 2px solid #333 !important; box-shadow: none !important; }
  body { font-size: 12pt; line-height: 1.5; }
  .hero { background: #fff !important; color: #000 !important; padding: 1rem !important; }
  a { color: #000 !important; }
  .result-box { background: #f0f0f0 !important; border: 1px solid #333 !important; }
}

/* ---------- AdSense 空白隐藏 ---------- */
ins.adsbygoogle[data-ad-status="unfilled"] { display: none !important; }

/* ---------- Loading Skeleton ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
  background-size: 200% 100%; animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ---------- Toast Notification ---------- */
.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%);
  background: var(--gray-900); color: #fff; padding: 0.85rem 1.5rem;
  border-radius: 50px; font-size: var(--font-sm); font-weight: 600;
  box-shadow: var(--shadow-lg); z-index: 2000;
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
  display: flex; align-items: center; gap: 0.5rem;
}
@keyframes toastIn { from { opacity: 0; transform: translateX(-50%) translateY(20px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }
@keyframes toastOut { from { opacity: 1; } to { opacity: 0; transform: translateX(-50%) translateY(-20px); } }

/* ---------- US State Map (CSS Grid) ---------- */
.map-container { position: relative; width: 100%; max-width: 860px; margin: 2rem auto; }
.us-map-grid {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 3px;
  padding: 1rem;
  background: #EFF6FF;
  border-radius: 16px;
  border: 2px solid #BFDBFE;
}
.map-state-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1.15;
  min-height: 38px;
  background: linear-gradient(135deg, #DBEAFE, #BFDBFE);
  color: #1E40AF;
  font-size: 11px;
  font-weight: 700;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.18s ease;
  border: 1px solid transparent;
  box-shadow: 0 1px 2px rgba(37,99,235,0.08);
  letter-spacing: -0.02em;
}
.map-state-btn:hover {
  background: linear-gradient(135deg, #3B82F6, #2563EB);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.25);
  border-color: #93C5FD;
}
.map-state-btn:active { transform: translateY(0); }
.map-cell-empty { min-height: 6px; }

/* Ocean labels (optional visual hint) */
.us-map-grid::before {
  content: '🗺️ Click any state to view costs';
  grid-column: 1 / -1;
  text-align: center;
  color: #64748B;
  font-size: 13px;
  margin-bottom: 0.5rem;
}

/* Mobile responsive */
@media (max-width: 768px) {
  .us-map-grid { grid-template-columns: repeat(10, 1fr); gap: 2px; padding: 0.75rem; }
  .map-state-btn { font-size: 9px; min-height: 32px; border-radius: 5px; }
  .map-cell-empty { display: none; }
}
@media (max-width: 520px) {
  .us-map-grid { grid-template-columns: repeat(6, 1fr); gap: 2px; }
}

/* ---------- State Comparison Table ---------- */
.compare-table { width: 100%; border-collapse: collapse; margin: 2rem 0; }
.compare-table th {
  background: var(--primary); color: #fff; padding: 1rem; text-align: center;
  font-weight: 700; font-size: var(--font-base);
}
.compare-table td { padding: 0.85rem 1rem; text-align: center; border-bottom: 1px solid var(--gray-200); font-size: var(--font-base); }
.compare-table tr:nth-child(even) td { background: var(--gray-50); }
.compare-badge {
  display: inline-block; padding: 0.2rem 0.6rem; border-radius: 20px;
  font-size: 0.8rem; font-weight: 700;
}
.compare-badge--low { background: var(--accent-light); color: var(--accent); }
.compare-badge--high { background: #FEE2E2; color: var(--danger); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root { --font-base: 1rem; --font-lg: 1.125rem; }
  .hero h1 { font-size: 1.75rem; }
  .hero p { font-size: var(--font-base); }
  .section-title { font-size: 1.35rem; }
  .calculator-box { padding: 1.5rem; }
  .tool-grid { grid-template-columns: 1fr; }
  .tab-btn { font-size: var(--font-sm); padding: 0.75rem 0.75rem; min-width: 160px; }
  .data-table { font-size: var(--font-sm); }
  .data-table th, .data-table td { padding: 0.6rem 0.75rem; }
  .share-buttons { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
}