/* ==========================================================================
   Apple-inspired Design System & Modern Aesthetics
   Beijing Home Repair Landing Page
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;
  
  /* Apple Light Mode Palette */
  --bg-primary: #fbfbfd;
  --bg-secondary: #f5f5f7;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-solid: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-card-glass: rgba(255, 255, 255, 0.75);
  
  --border-light: rgba(0, 0, 0, 0.08);
  --border-subtle: rgba(0, 0, 0, 0.04);
  --border-focus: rgba(0, 113, 227, 0.4);
  
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --text-quaternary: #a1a1a6;
  
  /* Apple Accents */
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --apple-blue-light: #e8f2fc;
  --apple-green: #34c759;
  --apple-green-hover: #30b753;
  --apple-green-light: #eaf8ee;
  --apple-orange: #ff9500;
  --apple-orange-light: #fff5e6;
  --apple-red: #ff3b30;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 28px 60px rgba(0, 0, 0, 0.12);

  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 9999px;

  --transition-apple: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Dark Mode Overrides */
[data-theme="dark"] {
  --bg-primary: #000000;
  --bg-secondary: #121214;
  --bg-card: rgba(26, 26, 29, 0.78);
  --bg-card-solid: #1c1c1e;
  --bg-card-hover: #242426;
  --bg-card-glass: rgba(28, 28, 30, 0.72);
  
  --border-light: rgba(255, 255, 255, 0.12);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-focus: rgba(0, 113, 227, 0.6);
  
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-tertiary: #86868b;
  --text-quaternary: #636366;
  
  --apple-blue: #2997ff;
  --apple-blue-hover: #47a6ff;
  --apple-blue-light: rgba(41, 151, 255, 0.15);
  --apple-green: #30d158;
  --apple-green-hover: #3deb68;
  --apple-green-light: rgba(48, 209, 88, 0.15);
  --apple-orange: #ff9f0a;
  --apple-orange-light: rgba(255, 159, 10, 0.15);
  
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 50px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 32px 70px rgba(0, 0, 0, 0.6);
}

/* Base resets & typography */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.55;
  transition: background-color 0.4s ease, color 0.4s ease;
}

/* Glassmorphic Navbar */
.nav-glass {
  background: rgba(251, 251, 253, 0.82);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition-apple);
}

[data-theme="dark"] .nav-glass {
  background: rgba(0, 0, 0, 0.82);
}

/* Apple Button & Interactive Elements */
.apple-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--apple-blue);
  color: #ffffff;
  font-weight: 500;
  border-radius: var(--radius-pill);
  padding: 12px 26px;
  font-size: 16px;
  line-height: 1.25;
  border: 1px solid transparent;
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.28);
  transition: var(--transition-apple);
  cursor: pointer;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.apple-btn-primary:hover {
  background-color: var(--apple-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 113, 227, 0.38);
}

.apple-btn-primary:active {
  transform: scale(0.98);
}

.apple-btn-green {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--apple-green);
  color: #ffffff;
  font-weight: 500;
  border-radius: var(--radius-pill);
  padding: 12px 26px;
  font-size: 16px;
  line-height: 1.25;
  border: 1px solid transparent;
  box-shadow: 0 4px 14px rgba(52, 199, 89, 0.28);
  transition: var(--transition-apple);
  cursor: pointer;
  text-decoration: none;
}

.apple-btn-green:hover {
  background-color: var(--apple-green-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(52, 199, 89, 0.38);
}

.apple-btn-green:active {
  transform: scale(0.98);
}

.apple-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--bg-card-solid);
  color: var(--text-primary);
  font-weight: 500;
  border-radius: var(--radius-pill);
  padding: 12px 24px;
  font-size: 16px;
  line-height: 1.25;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-apple);
  cursor: pointer;
  text-decoration: none;
}

.apple-btn-secondary:hover {
  background-color: var(--bg-secondary);
  border-color: var(--border-focus);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.apple-btn-secondary:active {
  transform: scale(0.98);
}

/* Glass Card & Bento Cards */
.bento-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-apple);
  position: relative;
  overflow: hidden;
}

.bento-card:hover {
  border-color: rgba(0, 113, 227, 0.25);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

[data-theme="dark"] .bento-card:hover {
  border-color: rgba(41, 151, 255, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}

/* Apple Badge */
.apple-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.2px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

.apple-badge-blue {
  background: var(--apple-blue-light);
  color: var(--apple-blue);
  border-color: rgba(0, 113, 227, 0.2);
}

.apple-badge-green {
  background: var(--apple-green-light);
  color: var(--apple-green);
  border-color: rgba(52, 199, 89, 0.2);
}

/* Pulsing Online Indicator */
.pulse-dot {
  position: relative;
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--apple-green);
  border-radius: 50%;
}

.pulse-dot::after {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--apple-green);
  opacity: 0.5;
  animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.6); opacity: 0.8; }
  50% { transform: scale(1.6); opacity: 0; }
  100% { transform: scale(0.6); opacity: 0; }
}

/* Hero Gradient Text */
.gradient-text-apple {
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--apple-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-blue-purple {
  background: linear-gradient(135deg, #0071e3 0%, #6851ff 50%, #9013fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Modal Overlay & Transitions */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 480px;
  width: 100%;
  padding: 32px;
  transform: scale(0.92) translateY(20px);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-content {
  transform: scale(1) translateY(0);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10000;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

.toast {
  background: rgba(29, 29, 31, 0.94);
  color: #ffffff;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  animation: toast-enter 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

[data-theme="dark"] .toast {
  background: rgba(245, 245, 247, 0.94);
  color: #1d1d1f;
}

@keyframes toast-enter {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.toast.toast-leave {
  animation: toast-leave 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes toast-leave {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(-15px) scale(0.92);
  }
}

/* Sticky Bottom Floating Bar */
.floating-bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 900;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-top: 1px solid var(--border-light);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px));
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: transform 0.35s ease;
}

[data-theme="dark"] .floating-bottom-bar {
  background: rgba(18, 18, 20, 0.92);
}

/* Smooth Accordion */
.faq-header {
  cursor: pointer;
  user-select: none;
}

.faq-header .icon-arrow {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-item.active .faq-header .icon-arrow {
  transform: rotate(180deg);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  opacity: 0;
}

.faq-item.active .faq-body {
  max-height: 400px;
  opacity: 1;
}

/* Interactive Calculator Tabs & Checkboxes */
.calc-option {
  cursor: pointer;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background: var(--bg-secondary);
  transition: var(--transition-apple);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.calc-option:hover {
  border-color: var(--apple-blue);
  background: var(--bg-card-solid);
}

.calc-option.selected {
  border-color: var(--apple-blue);
  background: var(--apple-blue-light);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--text-quaternary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}