/* ═══════════════════════════════════════════
   睦邻兔 — Design Tokens & Shared Styles
   ═══════════════════════════════════════════ */
:root {
  --brand-orange: #E8623C; --brand-orange-hover: #D4542E; --brand-orange-light: #FFF0EC;
  --brand-green: #2ECC71; --brand-green-light: #EAF9F0;
  --brand-brown: #8B4513; --brand-brown-light: #F5EFE8;
  --white: #FFFFFF; --gray-50: #FAFAFA; --gray-100: #F3F4F6; --gray-200: #E5E7EB;
  --gray-300: #D1D5DB; --gray-400: #9CA3AF; --gray-500: #6B7280; --gray-600: #4B5563;
  --gray-700: #374151; --gray-800: #1F2937; --gray-900: #111827;
  --color-primary: #E8623C; --color-primary-hover: #D4542E; --color-primary-light: #FFF0EC;
  --color-secondary: #2ECC71; --color-secondary-light: #EAF9F0;
  --color-accent: #8B4513; --color-accent-light: #F5EFE8;
  --color-bg: #FAFAFA; --color-bg-card: #FFFFFF;
  --color-text: #1F2937; --color-text-secondary: #6B7280; --color-text-tertiary: #9CA3AF;
  --color-border: #E5E7EB; --color-error: #E74C3C; --color-success: #2ECC71;
  --text-xs: 12px; --text-sm: 14px; --text-base: 16px; --text-lg: 18px; --text-xl: 20px;
  --text-2xl: 24px; --text-3xl: 32px; --text-4xl: 42px; --text-5xl: 56px;
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-5: 20px; --space-6: 24px;
  --space-8: 32px; --space-10: 40px; --space-12: 48px; --space-16: 64px; --space-20: 80px; --space-24: 96px;
  --radius-sm: 6px; --radius-md: 10px; --radius-lg: 16px; --radius-xl: 24px; --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06); --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.10); --shadow-xl: 0 20px 60px rgba(0,0,0,.12);
  --transition-fast: 150ms ease; --transition-base: 250ms ease;
  --container-xl: 1200px; --header-height: 64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; }
body { font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, 'Segoe UI', sans-serif; color: var(--color-text); background: var(--color-bg); line-height: 1.6; overflow-x: hidden; }
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.3; }
h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
p { color: var(--color-text-secondary); line-height: 1.75; }

.container { width: 100%; max-width: var(--container-xl); margin: 0 auto; padding: 0 var(--space-6); }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 var(--space-6); height: 48px; border-radius: var(--radius-full); font-size: var(--text-base); font-weight: 600; cursor: pointer; transition: all var(--transition-base); border: 2px solid transparent; white-space: nowrap; }
.btn-primary { background: var(--color-primary); color: var(--white); }
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(232,98,60,.35); }
.btn-outline { background: transparent; color: var(--brand-orange); border-color: var(--brand-orange); }
.btn-outline:hover { background: var(--color-primary-light); }
.btn-white { background: var(--white); color: var(--brand-orange); }
.btn-white:hover { background: var(--gray-50); }
.btn-lg { height: 56px; padding: 0 var(--space-8); font-size: var(--text-lg); }
.btn-sm { height: 36px; padding: 0 var(--space-4); font-size: var(--text-sm); }

/* ── Header ── */
.header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--color-border); height: var(--header-height); transition: box-shadow var(--transition-base); }
.header.scrolled { box-shadow: var(--shadow-md); }
.header-inner { display: flex; align-items: center; justify-content: space-between; max-width: var(--container-xl); margin: 0 auto; padding: 0 var(--space-6); height: var(--header-height); }
.header-logo { display: flex; align-items: center; gap: 10px; font-size: var(--text-xl); font-weight: 800; color: var(--brand-orange); }
.header-logo img { height: 62px; width: auto; }
.header-nav { display: flex; align-items: center; gap: var(--space-1); }
.header-nav a { padding: 8px 16px; border-radius: var(--radius-full); font-size: var(--text-sm); font-weight: 500; color: var(--gray-600); transition: all 150ms ease; }
.header-nav a:hover { color: var(--color-primary); background: var(--color-primary-light); }
.header-nav a.active { color: var(--color-primary); background: var(--color-primary-light); font-weight: 600; }
.header-cta { display: flex; align-items: center; gap: var(--space-3); }

/* ── Hamburger + Mobile Drawer ── */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--gray-700); border-radius: 2px; }
.mobile-drawer-overlay { display: none; position: fixed; inset: 0; z-index: 1100; background: rgba(0,0,0,.4); opacity: 0; transition: opacity 250ms ease; }
.mobile-drawer-overlay.open { display: block; opacity: 1; }
.mobile-drawer { position: fixed; top: 0; right: -320px; width: 280px; height: 100%; z-index: 1200; background: var(--white); box-shadow: var(--shadow-xl); transition: right 250ms ease; overflow-y: auto; padding: var(--space-6); }
.mobile-drawer.open { right: 0; }
.drawer-close { display: flex; align-items: center; justify-content: flex-end; font-size: var(--text-2xl); color: var(--gray-500); cursor: pointer; margin-bottom: var(--space-6); }
.drawer-nav a { display: flex; align-items: center; gap: 12px; padding: 12px 0; font-size: var(--text-base); color: var(--gray-700); border-bottom: 1px solid var(--color-border); }
.drawer-nav a:hover { color: var(--color-primary); }
.drawer-nav a.active { color: var(--color-primary); font-weight: 600; }

/* ── Footer ── */
.footer { background: var(--gray-900); color: rgba(255,255,255,.6); padding: var(--space-16) 0 var(--space-8); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-10); margin-bottom: var(--space-12); }
.footer-brand-name { font-size: var(--text-xl); font-weight: 800; color: var(--brand-orange); margin-bottom: var(--space-3); }
.footer-brand p { font-size: var(--text-sm); color: rgba(255,255,255,.5); margin-bottom: var(--space-4); line-height: 1.7; max-width: 300px; }
.footer-col h5 { font-size: var(--text-sm); font-weight: 700; color: var(--white); margin-bottom: var(--space-4); letter-spacing: .5px; }
.footer-col a { display: block; font-size: var(--text-sm); color: rgba(255,255,255,.5); padding: 4px 0; transition: color 150ms ease; }
.footer-col a:hover { color: var(--brand-orange); }
.footer-contact li { font-size: var(--text-sm); color: rgba(255,255,255,.5); padding: 4px 0; display: flex; align-items: flex-start; gap: 8px; }
.footer-qr { display: flex; gap: var(--space-4); }
.footer-qr-item { text-align: center; }
.footer-qr-item img { width: 100px; height: 100px; border-radius: var(--radius-md); border: 2px solid rgba(255,255,255,.15); }
.footer-qr-item p { font-size: var(--text-xs); color: rgba(255,255,255,.5); margin-top: var(--space-2); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-top: var(--space-6); display: flex; align-items: center; justify-content: space-between; font-size: var(--text-xs); color: rgba(255,255,255,.35); }

/* ── Section helpers ── */
.section { padding: var(--space-20) 0; }
.section-label { display: inline-flex; align-items: center; gap: 8px; font-size: var(--text-xs); font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--color-primary); margin-bottom: var(--space-3); }
.section-label::before { content:''; width: 20px; height: 2px; background: var(--color-primary); border-radius: 2px; }
.section-title { font-size: var(--text-3xl); color: var(--gray-900); margin-bottom: var(--space-4); }
.section-desc { font-size: var(--text-base); color: var(--color-text-secondary); max-width: 640px; }
.text-center { text-align: center; }
.text-center .section-desc { margin: 0 auto var(--space-10); }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ── Tag ── */
.tag { display: inline-flex; align-items: center; padding: 4px 12px; border-radius: var(--radius-full); font-size: var(--text-xs); font-weight: 600; }
.tag-green { background: #EAF9F0; color: #15803D; }
.tag-orange { background: #FFF0EC; color: #E8623C; }
.tag-brown { background: #F5EFE8; color: #8B4513; }

/* ── Toast ── */
.toast-container { position: fixed; bottom: var(--space-6); right: var(--space-6); z-index: 3000; display: flex; flex-direction: column; gap: var(--space-3); }
.toast { padding: var(--space-3) var(--space-5); border-radius: var(--radius-md); font-size: var(--text-sm); font-weight: 600; color: var(--white); box-shadow: var(--shadow-lg); animation: toastIn 0.3s ease; }
.toast.leaving { animation: toastOut 0.3s ease forwards; }
.toast-success { background: var(--brand-green); }
.toast-error { background: var(--color-error); }
@keyframes toastIn { from { opacity:0; transform: translateY(20px); } to { opacity:1; transform:none; } }
@keyframes toastOut { from { opacity:1; transform:none; } to { opacity:0; transform:translateY(20px); } }

/* ── Back link ── */
.back-link { display: inline-flex; align-items: center; gap: 6px; font-size: var(--text-sm); color: var(--color-text-secondary); margin-bottom: var(--space-8); transition: color var(--transition-base); }
.back-link:hover { color: var(--color-primary); }

@media (max-width: 1024px) {
  :root { --text-4xl: 36px; --text-5xl: 44px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --text-3xl: 26px; --text-4xl: 30px; --text-5xl: 36px; }
  .section { padding: var(--space-12) 0; }
  .hamburger { display: flex; }
  .header-nav { display: none; }
  .header-cta { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
}
@media (max-width: 480px) {
  .btn-lg { width: 100%; }
}