/* IndexTTS2 - Optimized Main Stylesheet */
/* Revolutionary Zero-Shot Text-to-Speech System */

/* ===== CSS Custom Properties ===== */
:root {
  /* Color Palette - IndexTTS2 High-Value Color Scheme */
  --primary-color: #4F46E5;
  --primary-dark: #3730A3;
  --primary-light: #6366F1;
  --secondary-color: #8B5CF6;
  --secondary-dark: #7C3AED;
  --secondary-light: #A78BFA;
  --accent-color: #22D3EE;
  --accent-dark: #06B6D4;
  --accent-light: #67E8F9;
  --emotion-color: #8B5CF6;
  --emotion-light: #A78BFA;
  --emotion-dark: #7C3AED;
  
  /* Neutral Colors */
  --white: #ffffff;
  --gray-50: #f9fafb;
  --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;
  --black: #000000;
  
  /* Semantic Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;
  
  /* Background Colors */
  --bg-primary: #F9FAFB;
  --bg-secondary: var(--white);
  --bg-tertiary: var(--gray-50);
  --bg-dark: var(--gray-900);
  
  /* Text Colors */
  --text-primary: #111827;
  --text-secondary: #6B7280;
  --text-tertiary: var(--gray-500);
  --text-light: var(--gray-400);
  --text-white: var(--white);
  
  /* Border Colors */
  --border-light: var(--gray-200);
  --border-medium: var(--gray-300);
  --border-dark: var(--gray-400);
  
  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  --font-size-7xl: 4.5rem;
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;
  
  --line-height-tight: 1.1;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Optimized Spacing */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --space-40: 10rem;
  --space-48: 12rem;
  
  /* Border Radius */
  --radius-sm: 0.125rem;
  --radius-base: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-base: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Z-Index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* Layout */
  --header-height: 4rem;
  --container-max-width: 1280px;
  --container-padding: 1rem;
  
  /* Grid */
  --grid-gap: 1.5rem;
  --grid-gap-lg: 2rem;
  --grid-gap-xl: 3rem;
}

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

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

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

main {
  padding-top: var(--space-12);
  padding-bottom: var(--space-20);
}

main {
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-6);
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, var(--font-size-6xl));
  font-weight: var(--font-weight-black);
  margin-bottom: var(--space-8);
  margin-top: var(--space-8);
}

h2 {
  font-size: clamp(2rem, 4vw, var(--font-size-5xl));
  font-weight: var(--font-weight-extrabold);
  margin-bottom: var(--space-7);
  margin-top: var(--space-8);
}

h3 {
  font-size: clamp(1.5rem, 3vw, var(--font-size-3xl));
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-5);
  margin-top: var(--space-6);
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, var(--font-size-2xl));
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  margin-top: var(--space-5);
}

h5 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  margin-top: var(--space-4);
}

h6 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-3);
  margin-top: var(--space-3);
}

p {
  margin-bottom: var(--space-8);
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: var(--font-size-base);
}

p:last-child {
  margin-bottom: 0;
}

ul, ol {
  margin-bottom: var(--space-8);
  padding-left: var(--space-8);
  line-height: 1.8;
}

li {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

li:last-child {
  margin-bottom: 0;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: all var(--transition-base);
  font-weight: var(--font-weight-medium);
}

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

/* ===== Layout Components ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-8);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-12);
  }
}

/* ===== Grid System ===== */
.grid {
  display: grid;
  gap: calc(var(--grid-gap) * 2);
}

.grid-2 {
  grid-template-columns: 1fr;
  gap: calc(var(--grid-gap) * 2);
}

.grid-3 {
  grid-template-columns: 1fr;
  gap: calc(var(--grid-gap) * 2);
}

.grid-4 {
  grid-template-columns: 1fr;
  gap: calc(var(--grid-gap) * 2);
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--grid-gap-lg);
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--grid-gap-lg);
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--grid-gap-lg);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--grid-gap-xl);
  }
  
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--grid-gap-xl);
  }
}

/* ===== Header & Navigation ===== */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(30px);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.99);
  box-shadow: var(--shadow-xl);
}

.navbar {
  height: var(--header-height);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

@media (min-width: 640px) {
  .nav-container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .nav-container {
    padding: 0 var(--space-8);
  }
}

.nav-logo {
  display: flex;
  align-items: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-base);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
}

.nav-logo:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.nav-logo img {
  height: auto;
  max-height: 45px;
  width: auto;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
  transition: all var(--transition-base);
}

.nav-logo:hover img {
  filter: drop-shadow(0 4px 8px rgba(79, 70, 229, 0.2));
}

.nav-menu {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-1);
}

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
    gap: var(--space-2);
  }
}

.nav-item {
  margin: 0;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  position: relative;
  font-size: var(--font-size-sm);
  backdrop-filter: blur(10px);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(34, 211, 238, 0.1) 100%);
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.1);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
  border-radius: 1px;
}

.nav-toggle {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

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

.nav-toggle:hover {
  background-color: var(--gray-100);
}

.nav-toggle-icon {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  position: relative;
  transition: all var(--transition-base);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-base);
}

.nav-toggle-icon::before {
  top: -8px;
}

.nav-toggle-icon::after {
  bottom: -8px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
  bottom: 0;
}

/* ===== Accessibility ===== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: var(--white);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-base);
  z-index: var(--z-tooltip);
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 6px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  min-height: 48px;
  backdrop-filter: blur(10px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-light) 100%);
  color: var(--white);
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
}

.btn-primary:hover {
  background: linear-gradient(90deg, var(--primary-dark) 0%, var(--primary-color) 100%);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--secondary-color) 100%);
  color: var(--white);
  border-color: var(--secondary-color);
  box-shadow: 0 4px 12px rgba(34, 211, 238, 0.2);
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite reverse;
}

.btn-secondary:hover {
  background: linear-gradient(135deg, var(--accent-dark) 0%, var(--secondary-dark) 100%);
  border-color: var(--secondary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(34, 211, 238, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
  position: relative;
  overflow: hidden;
}

.btn-outline::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-light) 100%);
  transition: left var(--transition-base);
  z-index: -1;
}

.btn-outline:hover {
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
}

.btn-outline:hover::before {
  left: 0;
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

/* ===== Page Layout ===== */
.page-header {
  padding: var(--space-16) 0 var(--space-12);
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, rgba(79, 70, 229, 0.03) 0%, rgba(99, 102, 241, 0.03) 50%, rgba(139, 92, 246, 0.03) 100%);
  pointer-events: none;
}

.page-title {
  font-size: clamp(2.5rem, 6vw, var(--font-size-6xl));
  font-weight: var(--font-weight-black);
  color: var(--text-primary);
  margin-bottom: var(--space-8);
  margin-top: var(--space-8);
  text-align: center;
  line-height: var(--line-height-tight);
}

.page-subtitle {
  font-size: clamp(1.125rem, 3vw, var(--font-size-xl));
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-12);
  line-height: var(--line-height-relaxed);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-12);
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.breadcrumb-item:not(:last-child)::after {
  content: '›';
  color: var(--gray-400);
  font-weight: var(--font-weight-bold);
}

.breadcrumb-link {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-base);
}

.breadcrumb-link:hover {
  color: var(--primary-color);
}

.breadcrumb-current {
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

/* ===== Section Layouts ===== */
.section {
  padding: var(--space-28) 0;
  margin-bottom: var(--space-16);
}

.section-alt {
  padding: var(--space-36) 0;
  background: var(--bg-secondary);
  margin-bottom: var(--space-16);
  position: relative;
}

.section-alt::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--border-light) 50%, transparent 100%);
}

.section-title {
  font-size: clamp(2.25rem, 4.5vw, var(--font-size-5xl));
  font-weight: var(--font-weight-black);
  color: var(--text-primary);
  margin-bottom: var(--space-12);
  margin-top: var(--space-12);
  text-align: center;
  position: relative;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
  border-radius: 2px;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.section-subtitle {
  font-size: clamp(1.125rem, 2.5vw, var(--font-size-lg));
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-12);
  line-height: var(--line-height-relaxed);
}

/* ===== Card Components ===== */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  padding: var(--space-12);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  margin-bottom: var(--space-10);
  backdrop-filter: blur(10px);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-lg {
  padding: var(--space-8);
}

.card-header {
  margin-bottom: var(--space-8);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-6);
}

.card-subtitle {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

.card-content {
  line-height: 1.7;
}

/* 优化特定内容的间距 */
.innovation-square,
.feature-square {
  margin-bottom: var(--space-12);
  padding: var(--space-8);
}

.innovation-square:last-child,
.feature-square:last-child {
  margin-bottom: 0;
}

.innovation-title,
.feature-title {
  margin-bottom: var(--space-6);
  margin-top: var(--space-6);
}

.innovation-description,
.feature-description {
  margin-bottom: var(--space-8);
  line-height: 1.8;
}

.innovation-features {
  margin-top: var(--space-6);
}

.innovation-features li {
  margin-bottom: var(--space-4);
  padding-left: var(--space-3);
}

/* 性能指标的特殊样式 */
.performance-metric {
  margin-bottom: var(--space-12);
  padding: var(--space-8);
  border-left: 4px solid var(--primary-color);
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
}

.performance-metric:last-child {
  margin-bottom: 0;
}

.performance-metric h3 {
  margin-bottom: var(--space-3);
  color: var(--primary-color);
}

.performance-metric .metric-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  margin-bottom: var(--space-3);
}

.performance-metric p {
  margin-bottom: 0;
  line-height: 1.7;
}
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ===== Hero Section ===== */
.hero-section {
  padding: var(--space-20) 0 var(--space-16);
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, rgba(79, 70, 229, 0.05) 0%, rgba(99, 102, 241, 0.05) 50%, rgba(139, 92, 246, 0.05) 100%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  gap: var(--space-12);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }
}

.hero-content {
  text-align: center;
  animation: fadeInUp 0.8s ease-out;
}

@media (min-width: 1024px) {
  .hero-content {
    text-align: left;
  }
}

.hero-title {
  font-size: clamp(3rem, 7vw, var(--font-size-7xl));
  font-weight: var(--font-weight-black);
  color: var(--text-primary);
  margin-bottom: var(--space-6);
  line-height: var(--line-height-tight);
}

.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, var(--font-size-xl));
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: var(--line-height-relaxed);
}

.hero-features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
  .hero-features-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
  }
}

.feature-square {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  text-align: center;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.6s ease-out;
}

.feature-square::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.feature-square:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-light);
}

.feature-square:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  display: block;
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-2);
}

.feature-text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

@media (min-width: 640px) {
  .hero-actions {
    flex-direction: row;
    justify-content: center;
  }
}

@media (min-width: 1024px) {
  .hero-actions {
    justify-content: flex-start;
  }
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: slideInRight 0.8s ease-out 0.2s both;
}

.hero-visual img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}



/* ===== Video Containers ===== */
.hero-video-container {
  position: relative;
  width: 100%;
  max-width: 600px;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: var(--gray-900);
}

.hero-video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* Demo video styles removed as requested */

/* 其他页面的视频容器样式 */
.tech-video-container,
.performance-video-container,
.applications-video-container,
.about-video-container {
  position: relative;
  width: 100%;
  max-width: 600px;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: var(--gray-900);
}

.tech-video-container iframe,
.performance-video-container iframe,
.applications-video-container iframe,
.about-video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

@media (max-width: 767px) {
  .hero-video-container {
    max-width: 100%;
    margin: 0 var(--space-4);
  }
}

/* ===== Footer ===== */
.footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-16);
}

.footer-content {
  display: grid;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
  .footer-content {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-12);
  }
}

.footer-section h4 {
  color: var(--white);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-6);
}

.footer-section p {
  color: var(--gray-400);
  margin-bottom: var(--space-6);
  line-height: var(--line-height-relaxed);
}

.footer-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-section li {
  margin-bottom: var(--space-3);
}

.footer-section a {
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: var(--space-8);
  text-align: center;
}

.footer-bottom p {
  color: var(--gray-500);
  font-size: var(--font-size-sm);
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Disabled state styles */
.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.disabled:hover {
  opacity: 0.6;
  transform: none;
  box-shadow: none;
}

/* Modern layout utilities */
.glass-effect {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

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

.hover-lift {
  transition: transform var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-4px);
}

.focus-ring {
  outline: none;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
  border-radius: var(--radius-lg);
}

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-white { color: var(--white); }

.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-dark { background-color: var(--bg-dark); }

/* Margin utilities */
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

/* Padding utilities */
.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.p-10 { padding: var(--space-10); }
.p-12 { padding: var(--space-12); }
.p-16 { padding: var(--space-16); }

/* Display utilities */
.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

.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;
}

/* ===== Responsive Design ===== */
@media (max-width: 639px) {
  .hero-title {
    font-size: clamp(2.25rem, 7vw, var(--font-size-5xl));
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
    line-height: 1.6;
  }
  
  .section-title {
    font-size: clamp(2rem, 6vw, var(--font-size-4xl));
    margin-bottom: var(--space-8);
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
    justify-content: center;
    padding: var(--space-4) var(--space-6);
  }
  
  .container {
    padding: 0 var(--space-6);
  }

  .card {
    padding: var(--space-8);
    margin-bottom: var(--space-6);
  }

  .grid {
    gap: var(--space-6);
  }
}

/* ===== Print Styles ===== */
@media print {
  .header,
  .footer,
  .nav-toggle,
  .btn {
    display: none;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }
  
  p, blockquote, table, figure {
    page-break-inside: avoid;
  }
}

/* ===== Dark Mode Support ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: var(--gray-900);
    --bg-secondary: var(--gray-800);
    --bg-tertiary: var(--gray-700);
    --text-primary: var(--gray-100);
    --text-secondary: var(--gray-300);
    --text-tertiary: var(--gray-400);
    --border-light: var(--gray-700);
    --border-medium: var(--gray-600);
    --border-dark: var(--gray-500);
  }
  
  .card {
    background-color: var(--gray-800);
    border-color: var(--gray-700);
  }
  
  .header {
    background-color: rgba(17, 24, 39, 0.95);
  }
}

/* ===== Modern Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 1;
  }
  100% {
    transform: scale(4);
    opacity: 0;
  }
}

@keyframes loading {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Apply animations to elements */
.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

.hero-visual {
  animation: slideInRight 0.8s ease-out 0.2s both;
}

.feature-square {
  animation: fadeInUp 0.6s ease-out;
}

.innovation-square {
  animation: fadeInUp 0.6s ease-out;
}

.innovation-square:nth-child(1) { animation-delay: 0.1s; }
.innovation-square:nth-child(2) { animation-delay: 0.2s; }
.innovation-square:nth-child(3) { animation-delay: 0.3s; }

/* Gradient animation for buttons */
.btn-primary {
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
}

.btn-secondary {
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite reverse;
}

/* Hover effects for interactive elements */
.feature-square:hover .feature-icon {
  animation: pulse 0.6s ease-in-out;
}

.innovation-square:hover .innovation-icon {
  animation: pulse 0.6s ease-in-out;
}

/* ===== Enhanced Interactive Elements ===== */
.animate-in {
  animation: slideInUp 0.6s ease-out;
}

.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: loading 1s linear infinite;
  margin-right: var(--space-2);
}

/* ===== Form Enhancements ===== */
.form-group {
  position: relative;
  margin-bottom: var(--space-4);
}

.form-group.focused label {
  color: var(--primary-color);
  transform: translateY(-20px) scale(0.85);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* ===== Search Enhancements ===== */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

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

.search-results {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  display: block;
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-light);
  text-decoration: none;
  transition: all var(--transition-base);
}

.search-result-item:hover {
  background: var(--gray-50);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item h4 {
  color: var(--text-primary);
  margin-bottom: var(--space-1);
  font-size: var(--font-size-base);
}

.search-result-item p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

.no-results {
  padding: var(--space-4);
  text-align: center;
  color: var(--text-secondary);
}

/* ===== Mobile Navigation Enhancements ===== */
@media (max-width: 767px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-dropdown);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu {
    flex-direction: column;
    padding: var(--space-4);
    gap: var(--space-2);
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
  }
}

/* ===== Theme Support ===== */
[data-theme="dark"] {
  --bg-primary: var(--gray-900);
  --bg-secondary: var(--gray-800);
  --bg-tertiary: var(--gray-700);
  --text-primary: var(--gray-100);
  --text-secondary: var(--gray-300);
  --text-tertiary: var(--gray-400);
  --border-light: var(--gray-700);
  --border-medium: var(--gray-600);
  --border-dark: var(--gray-500);
}

[data-theme="dark"] .header {
  background: rgba(17, 24, 39, 0.95);
  border-bottom-color: var(--gray-700);
}

[data-theme="dark"] .card {
  background-color: var(--gray-800);
  border-color: var(--gray-700);
}

/* ===== Print Optimizations ===== */
@media print {
  .header,
  .footer,
  .nav-toggle,
  .btn,
  .search-overlay {
    display: none !important;
  }

  body {
    font-size: 12pt;
    line-height: 1.4;
    background: white !important;
    color: black !important;
  }

  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
    color: black !important;
  }

  p, blockquote, table, figure {
    page-break-inside: avoid;
  }

  .card {
    border: 1px solid #ccc !important;
    box-shadow: none !important;
    background: white !important;
  }
} 
}