/* ==========================================================================
   OxBot 深度科技设计系统 v3.0 - Deep Tech Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  /* 明亮模式背景体系 - Light Backgrounds */
  --bg-deep: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;

  /* 磨砂玻璃效果背景 - Glassmorphism Backgrounds (Light) */
  --glass-base: rgba(255, 255, 255, 0.7);
  --glass-hover: rgba(255, 255, 255, 0.9);
  --glass-nav: rgba(255, 255, 255, 0.9);

  /* 文字颜色体系 - Text Colors (Light) */
  --text-pure: #111827;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;

  /* 赛道红主题色 - Racing Red Accents */
  --accent-primary: #D6001C;
  --accent-hover: #D6001C;
  --accent-glow: rgba(225, 29, 72, 0.3);
  --accent-glow-strong: rgba(225, 29, 72, 0.6);

  /* 辅助色 - Secondary Accents */
  --accent-blue: #3b82f6;
  --accent-blue-glow: rgba(59, 130, 246, 0.3);

  /* 边框体系 - Borders (Light) */
  --border-subtle: rgba(0, 0, 0, 0.05);
  --border-light: rgba(0, 0, 0, 0.1);
  --border-highlight: rgba(0, 0, 0, 0.2);

  /* 字体系统 - Typography */
  --font-display: 'Space Grotesk', 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;

  /* 动画系统 - Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 卡片阴影体系 - Card Shadows (Light) */
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --card-shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.12), 0 0 20px var(--accent-glow);
}

:root[data-theme="dark"] {
  /* 极致深色背景体系 - Deep Dark Backgrounds */
  --bg-deep: #030305;
  --bg-surface: #0a0a10;
  --bg-surface-elevated: #11111a;

  /* 磨砂玻璃效果背景 - Glassmorphism Backgrounds (Dark) */
  --glass-base: rgba(15, 15, 20, 0.6);
  --glass-hover: rgba(25, 25, 35, 0.8);
  --glass-nav: rgba(5, 5, 8, 0.85);

  /* 文字颜色体系 - Text Colors (Dark) */
  --text-pure: #ffffff;
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  /* 边框体系 - Borders (Dark) */
  --border-subtle: rgba(255, 255, 255, 0.05);
  --border-light: rgba(255, 255, 255, 0.1);
  --border-highlight: rgba(255, 255, 255, 0.2);

  /* 阴影效果增强 (Dark) */
  --accent-glow: rgba(225, 29, 72, 0.4);
  --accent-glow-strong: rgba(225, 29, 72, 0.8);
  --accent-blue-glow: rgba(59, 130, 246, 0.4);

  /* 卡片阴影体系 - Card Shadows (Dark) */
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  --card-shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.8), 0 0 20px var(--accent-glow-strong);
}

/* ==========================================================================
   基础重置 - Base Reset
   ========================================================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
  background-color: var(--bg-deep);
  transition: background-color 0.3s ease;
}

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  background-color: var(--bg-deep);
  background-image:
    radial-gradient(circle at 15% 50%, rgba(225, 29, 72, 0.03), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(59, 130, 246, 0.03), transparent 25%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* 覆盖 Tailwind 的明亮主题类，在暗黑模式下强制暗主题 */
[data-theme="dark"] .bg-gray-50,
[data-theme="dark"] .bg-white {
  background-color: transparent !important;
}

[data-theme="dark"] .text-gray-900 {
  color: var(--text-pure) !important;
}

[data-theme="dark"] .text-gray-600,
[data-theme="dark"] .text-gray-500 {
  color: var(--text-secondary) !important;
}

::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-highlight);
}

/* ==========================================================================
   排版 - Typography
   ========================================================================== */

h1,
h2,
h3,
h4,
h5,
h6,
.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-pure);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.gradient-text {
  background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-red {
  background: linear-gradient(135deg, #ff6a6a 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ==========================================================================
   布局 - Layout
   ========================================================================== */

.container {
  width: 100%;
  max-width: 1400px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (min-width: 768px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

@media (min-width: 1280px) {
  .container {
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }
}

.section-wrapper {
  position: relative;
  width: 100%;
}

.section-padding {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

@media (min-width: 768px) {
  .section-padding {
    padding-top: 6rem;
    padding-bottom: 6rem;
  }
}

@media (min-width: 1024px) {
  .section-padding {
    padding-top: 8rem;
    padding-bottom: 8rem;
  }
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 3.5rem;
  }
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 4rem;
  font-weight: 400;
}

/* ==========================================================================
   组件 - Components
   ========================================================================== */

/* Page Banners */
.page-banner-container {
  max-width: 1400px;
  margin: 100px auto 2rem;
  padding: 0 2rem;
}

.page-banner-inner {
  border-radius: 20px;
  overflow: hidden;
  width: 100%;
  position: relative;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.page-banner-inner img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* 导航栏 - Glass Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  z-index: 1000;
  transition: all var(--transition-base);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
  height: 100%;
  max-width: 1400px;
  margin: 0 auto;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 1.5rem;
  position: relative;
}

/* Responsive navbar padding */
@media (min-width: 768px) {
  .nav-content { padding: 0 2rem; }
}
@media (min-width: 1280px) {
  .nav-content { padding: 0 2.5rem; }
}


.navbar.scrolled {
  background: var(--glass-nav-scrolled);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  border-bottom-color: var(--border-highlight);
}

.nav-logo {
  display: flex;
  align-items: center;
  height: 100%;
  z-index: 10;
}

.nav-logo img {
  height: 32px;
  transition: transform var(--transition-base);
}

.nav-logo:hover img {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  white-space: nowrap;
  /* Prevent items from wrapping to a new line */
}

.nav-menu {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  padding-right: 3rem;
  /* Space between links and mode toggle */
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  position: relative;
  font-family: var(--font-display);
  letter-spacing: 0.02em;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-pure);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-primary);
  transition: width var(--transition-base);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--accent-glow);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Web Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.875rem 2rem;
  border-radius: 100px;
  font-weight: 600;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: all var(--transition-bounce);
  cursor: pointer;
  border: none;
  outline: none;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn-primary,
.btn-error {
  background: var(--accent-primary);
  color: #ffffff !important;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:before,
.btn-error:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0));
  z-index: -1;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn-primary:hover,
.btn-error:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px var(--accent-glow-strong);
}

.btn-primary:hover:before,
.btn-error:hover:before {
  opacity: 1;
}

.btn-outline {
  background: transparent;
  color: var(--text-pure);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  border-color: var(--text-pure);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-3px);
}

/* Glass Cards */
.card,
.product-card,
.feature-card {
  background: var(--glass-base) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle) !important;
  border-radius: 24px !important;
  transition: all var(--transition-bounce) !important;
  overflow: hidden;
  position: relative;
  box-shadow: var(--card-shadow) !important;
  color: var(--text-primary);
}

.card h1,
.card h2,
.card h3,
.card h4,
.product-card h3,
.product-card h4,
.feature-card h3,
.feature-card h4 {
  color: var(--text-pure) !important;
}

.card::before,
.product-card::before,
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-highlight), transparent);
  opacity: 0.5;
}

.card:hover,
.product-card:hover,
.product-item:hover,
.feature-card:hover {
  transform: translateY(-8px) !important;
  background: var(--glass-hover) !important;
  border-color: var(--border-light) !important;
  box-shadow: var(--card-shadow-hover), 0 8px 25px rgba(255, 0, 0, 0.3) !important;
}

/* Hover effect for links inside cards */
.product-card:hover a,
.product-item:hover a:not(.filter-btn) {
  background: #D6001C !important;
  color: #ffffff !important;
  border-color: #D6001C !important;
  box-shadow: 0 4px 12px rgba(255, 0, 0, 0.3);
}

/* Product Specifics */
.product-image {
  width: 100%;
  height: 300px;
  object-fit: contain;
  padding: 2rem;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  filter: drop-shadow(0 20px 20px rgba(0, 0, 0, 0.5));
}

.product-card:hover .product-image {
  transform: scale(1.1) translateY(-10px);
}

.product-info {
  padding: 2rem;
  background: linear-gradient(to top, var(--bg-surface-elevated), transparent);
  border-top: 1px solid var(--border-subtle);
}

.product-title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-pure);
}

.product-description {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 150px;
  background: linear-gradient(to top, var(--bg-deep), transparent);
  z-index: 2;
}

.hero-content {
  text-align: center;
  z-index: 10;
  position: relative;
  max-width: 900px;
  padding: 0 2rem;
}

/* Hero carousel container alignment */
.hero-carousel .container {
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}
@media (min-width: 768px) {
  .hero-carousel .container { padding-left: 2rem; padding-right: 2rem; }
}
@media (min-width: 1280px) {
  .hero-carousel .container { padding-left: 2.5rem; padding-right: 2.5rem; }
}

/* Reduce gap after hero */
.hero-carousel + .section-padding { padding-top: 3rem; }

.hero-title {
  font-size: clamp(3.5rem, 8vw, 6rem);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  color: var(--text-secondary);
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

/* Dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-btn {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  padding-top: 1rem;
}

.nav-dropdown:hover .nav-dropdown-menu {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav-dropdown-content {
  background: var(--glass-nav);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 0.5rem;
  min-width: 150px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.nav-dropdown-link {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 10px;
  transition: all var(--transition-fast);
}

.nav-dropdown-link:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-pure);
}

/* Mobile Menu */
.nav-mobile-btn {
  display: none;
}

.mobile-menu-toggle {
  background: transparent;
  border: none;
  color: var(--text-pure);
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  .nav-mobile-btn {
    display: block;
  }

  .nav-mobile-menu {
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    z-index: 990;
  }
  
  .nav-mobile-menu.hidden {
    display: none !important;
  }

  .nav-mobile-content {
    display: flex;
    flex-direction: column;
    padding: 1rem 0;
  }
  
  .nav-mobile-link,
  .nav-mobile-dropdown-title {
    padding: 1.25rem 2rem;
    color: var(--text-pure);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .nav-mobile-link:active,
  .nav-mobile-link.active {
    color: var(--accent-primary);
  }
  
  .nav-mobile-dropdown-content {
    background: rgba(128,128,128,0.05);
    display: flex;
    flex-direction: column;
  }
  
  .nav-mobile-dropdown-link {
    display: block;
    padding: 1rem 2rem 1rem 3rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1rem;
    border-bottom: 1px solid var(--border-light);
  }

  .hero-title {
    font-size: 3rem;
  }

  .hero-buttons {
    flex-direction: column;
  }
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  padding: 3rem 2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.feature-icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  background: rgba(128, 128, 128, 0.1);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--text-pure);
  margin-bottom: 2rem;
  box-shadow: inset 0 0 20px rgba(128, 128, 128, 0.05);
  transition: transform var(--transition-bounce), border-color var(--transition-base);
}

.feature-card:hover .feature-icon {
  transform: translateY(-10px) scale(1.1);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  box-shadow: 0 0 30px var(--accent-glow);
}

/* Footer */
.footer {
  background: #0a0a10;
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem;
  color: #a1a1aa;
}

.footer-content {
  margin-bottom: 3rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--text-pure);
}

/* Tools & Manuals Icon overrides */
.download-icon {
  background: rgba(255, 255, 255, 0.05) !important;
  border: 1px solid var(--border-light);
  color: var(--text-pure);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.download-icon i {
  color: var(--text-pure) !important;
}

/* Helpers */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.gap-2 {
  gap: 0.5rem;
}

.w-full {
  width: 100%;
}

.h-full {
  height: 100%;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.mb-6 {
  margin-bottom: 1.5rem;
}

/* 初始隐藏用于动画 */
.reveal,
.reveal-up,
.reveal-left,
.fade-in,
.slide-in-left,
.slide-in-right {
  opacity: 0;
  visibility: hidden;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.8s;
}

.slide-in-left {
  transform: translateX(-50px);
}

.slide-in-right {
  transform: translateX(50px);
}

.reveal.visible,
.reveal-up.visible,
.reveal-left.visible,
.fade-in.visible,
.slide-in-left.visible,
.slide-in-right.visible {
  opacity: 1;
  visibility: visible;
  transform: translate(0);
}

/* Base Warranty Page Text Spacing Fixes */
.warranty-content .text-content h3 {
  margin-bottom: 1.5rem;
}
.warranty-content .text-content h4 {
  margin-bottom: 1rem;
}
.warranty-content .text-gray-600 {
  line-height: 2 !important;
  letter-spacing: 0.02em;
}
.warranty-content .text-gray-600.space-y-2 > :not([hidden]) ~ :not([hidden]),
.warranty-content .text-gray-600.space-y-3 > :not([hidden]) ~ :not([hidden]) {
  margin-top: 1.25rem !important;
}

/* Home Page Navbar Overrides for Dark/White requirements */
.page-home .navbar {
  background: transparent !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
}
.page-home .navbar.scrolled {
  background: rgba(0, 0, 0, 0.6) !important;
  backdrop-filter: blur(20px) !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
}
.page-home .nav-link,
.page-home .navbar .theme-toggle {
  color: #e5e7eb !important; /* brighter gray, Tailwind gray-200 */
}
.page-home .nav-link:hover,
.page-home .nav-link.active,
.page-home .navbar .theme-toggle:hover {
  color: #ffffff !important;
}
.page-home .nav-link::after {
  background: #ffffff !important;
  box-shadow: 0 0 8px rgba(255,255,255,0.5) !important;
}
/* ==========================================================================
   下载中心与新Banner样式
   ========================================================================== */

.page-download-center .group:hover .group-hover\:scale-110 {
    transform: scale(1.1);
}

.banner-container {
    position: relative;
    width: 100%;
    overflow: hidden;
    background-color: #f5f5f7;
}

.banner-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
}

/* 针对移动端的Banner调整，确保图片不被压缩得太厉害 */
@media (max-width: 768px) {
    .banner-container {
        min-height: 200px;
    }
    .banner-image {
        min-height: 200px;
        object-position: center;
    }
}

/* 下载卡片悬浮效果 */
.download-card {
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.download-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

/* 按钮微交互 */
.btn-animate {
    position: relative;
    overflow: hidden;
}

.btn-animate::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-animate:active::after {
    width: 300px;
    height: 300px;
    opacity: 0;
}

/* ==========================================================================
   模态框 - Modal
   ========================================================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-surface);
    border-radius: 12px;
    padding: 2rem;
    position: relative;
    max-width: 90%;
    width: 400px;
    transform: translateY(-20px);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.close-modal:hover {
    color: var(--accent-primary);
}

.wechat-qr-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-light);
}
/* ==========================================================================
   产品下载页改版样式 - Refined Download Page Styles
   ========================================================================== */

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.5rem;
  background: var(--accent-primary);
  color: #fff !important;
  border-radius: 99px;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-base);
  box-shadow: 0 4px 15px var(--accent-glow);
  border: 1px solid var(--accent-primary);
  font-size: 0.95rem;
}

.back-btn:hover {
  background: var(--accent-hover);
  transform: translateX(-5px);
  box-shadow: 0 6px 20px var(--accent-glow-strong);
}

.section-title-red {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-pure);
  margin-bottom: 2rem;
}

.section-title-red::before {
  content: '';
  display: block;
  width: 4px;
  height: 1.5rem;
  background: var(--accent-primary);
  border-radius: 2px;
}

.qr-card-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
}

.qr-image-wrapper {
  background: #fff;
  padding: 1rem;
  border-radius: 1.5rem;
  box-shadow: inset 0 0 15px rgba(0,0,0,0.05);
  border: 1px solid var(--border-light);
}

.qr-image-wrapper img {
  width: 151px;
  height: 151px;
  display: block;
  border-radius: 0.5rem;
}

[data-theme="dark"] .qr-image-wrapper {
  background: #fff; /* Keep QR code background white for scannability */
}