/**
 * Smart APP Website - New API Style
 * Matching the exact layout of docs.newapi.ai
 */

/* ========================================
   CSS Variables
   ======================================== */

:root {
  --font-system: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  
  /* Colors - Light Mode */
  --primary: #667eea;
  --primary-dark: #764ba2;
  --accent-pink: #f093fb;
  --accent-cyan: #4facfe;
  
  --text-primary: #1a1a2e;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  
  --border-color: #e2e8f0;
  
  --hero-gradient: linear-gradient(135deg, #fdf2f8 0%, #ede9fe 40%, #e0f2fe 100%);
  
  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
}

/* Dark Mode */
[data-theme="dark"] {
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  
  --border-color: #334155;
  
  --hero-gradient: linear-gradient(135deg, #1e1b4b 0%, #312e81 40%, #1e3a5f 100%);
}

/* Auto Dark Mode (System Preference) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    
    --border-color: #334155;
    
    --hero-gradient: linear-gradient(135deg, #1e1b4b 0%, #312e81 40%, #1e3a5f 100%);
  }
}

/* ========================================
   Base Styles
   ======================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-system);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

/* ========================================
   Navigation
   ======================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .navbar {
  background: rgba(15, 23, 42, 0.8);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .navbar {
    background: rgba(15, 23, 42, 0.8);
  }
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 64px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 18px;
}

.brand-logo {
  border-radius: var(--radius-sm);
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--space-8);
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.btn-nav {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  background: rgba(102, 126, 234, 0.1);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background 0.2s;
}

.btn-nav:hover {
  background: rgba(102, 126, 234, 0.15);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Theme Toggle Button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-secondary);
  transition: background 0.2s, color 0.2s;
}

.theme-toggle:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: none;
  }
  
  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: block;
  }
}

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

/* ========================================
   Main Content
   ======================================== */

.main-content {
  padding-top: calc(64px + var(--space-4));
  padding-bottom: var(--space-12);
}

/* ========================================
   Hero Card (New API Style)
   ======================================== */

.hero-card {
  position: relative;
  display: flex;
  height: 70vh;
  max-height: 900px;
  min-height: 600px;
  width: calc(100% - 48px);
  max-width: 1400px;
  margin: 0 auto;
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-color);
  overflow: visible;
}

/* Gradient Background */
.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--hero-gradient);
  border-radius: var(--radius-2xl);
  z-index: 0;
}

/* 3D Orb - Right Side */
.hero-orb {
  position: absolute;
  width: 280px;
  height: 280px;
  top: 10%;
  right: 10%;
  z-index: 1;
  animation: orbFloat 6s ease-in-out infinite;
}

.orb-inner {
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    #667eea 0%,
    #f093fb 35%,
    #4facfe 65%,
    #43e97b 100%
  );
  border-radius: 50%;
  box-shadow: 
    inset -30px -30px 60px rgba(0, 0, 0, 0.15),
    inset 30px 30px 60px rgba(255, 255, 255, 0.3),
    0 20px 60px rgba(102, 126, 234, 0.3);
  position: relative;
}

.orb-inner::before {
  content: '';
  position: absolute;
  width: 50%;
  height: 50%;
  top: 10%;
  left: 15%;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.5) 0%,
    transparent 60%
  );
  border-radius: 50%;
}

.orb-inner::after {
  content: '';
  position: absolute;
  width: 30px;
  height: 30px;
  top: 20%;
  left: 25%;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 50%;
  filter: blur(6px);
}

@keyframes orbFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

/* Preview Images - Stacked/Overlapping Style */
.hero-preview-img {
  position: absolute;
  bottom: -40px;
  width: 280px;
  border-radius: var(--radius-xl);
  border: 2px solid rgba(255, 255, 255, 0.9);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.12),
    0 16px 48px rgba(102, 126, 234, 0.2);
  animation: fadeInUp 0.7s ease-out backwards;
  transition: transform 0.3s ease;
}

/* 第一张图片 - 最左边，最底层 */
.hero-preview-img.img-1 {
  right: 480px;
  z-index: 2;
  animation-delay: 0s;
}

/* 第二张图片 - 中间，中层 */
.hero-preview-img.img-2 {
  right: 280px;
  z-index: 3;
  animation-delay: 0.1s;
}

/* 第三张图片 - 最右边，最上层 */
.hero-preview-img.img-3 {
  right: 80px;
  z-index: 4;
  animation-delay: 0.2s;
}

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

/* Hero Content - Left Side */
.hero-content {
  position: relative;
  z-index: 3;
  display: flex;
  flex-direction: column;
  padding: var(--space-12);
  max-width: 550px;
}

.hero-badge {
  display: inline-block;
  width: fit-content;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: #be185d;
  background: rgba(190, 24, 93, 0.1);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero-title {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

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

.hero-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.7;
  max-width: 400px;
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  border-radius: var(--radius-lg);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.btn-secondary:hover {
  border-color: var(--primary);
  background: rgba(102, 126, 234, 0.05);
}

/* Mobile Responsive */
@media (max-width: 1024px) {
  .hero-card {
    height: auto;
    min-height: auto;
    flex-direction: column;
    overflow: hidden;
  }
  
  .hero-content {
    text-align: center;
    align-items: center;
    padding: var(--space-8) var(--space-4);
  }
  
  .hero-subtitle {
    max-width: 100%;
  }
  
  .hero-actions {
    justify-content: center;
    margin-bottom: var(--space-6);
  }
  
  .hero-orb {
    width: 120px;
    height: 120px;
    top: 10px;
    right: 10px;
    opacity: 0.5;
  }
  
  /* 隐藏桌面端的绝对定位图片 */
  .hero-preview-img {
    display: none;
  }
  
  /* 显示移动端图片 */
  .hero-preview-img-mobile {
    display: block;
    width: 100%;
    max-width: 220px;
    border-radius: var(--radius-xl);
    border: 2px solid rgba(255, 255, 255, 0.8);
    box-shadow: 
      0 8px 32px rgba(0, 0, 0, 0.1),
      0 16px 48px rgba(102, 126, 234, 0.15);
    margin-top: var(--space-4);
  }
}

/* 桌面端隐藏移动端图片 */
.hero-preview-img-mobile {
  display: none;
}

@media (max-width: 640px) {
  .hero-card {
    width: calc(100% - 24px);
    border-radius: var(--radius-xl);
  }
  
  .hero-orb {
    display: none;
  }
  
  .hero-content {
    padding: var(--space-6) var(--space-4);
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .hero-subtitle {
    font-size: 14px;
  }
  
  .hero-preview-img-mobile {
    max-width: 180px;
  }
  
  .partners-section {
    margin-top: var(--space-8);
  }
  
  .partners-grid {
    gap: var(--space-2);
  }
  
  .partner-item {
    padding: var(--space-2) var(--space-4);
    font-size: 13px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .feature-card {
    padding: var(--space-4);
  }
}

/* ========================================
   Partners Section
   ======================================== */

.partners-section {
  margin-top: var(--space-16);
  padding: var(--space-12) var(--space-4);
  text-align: center;
}

.partners-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.partners-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
}

.partners-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  max-width: 800px;
  margin: 0 auto;
}

.partner-item {
  padding: var(--space-3) var(--space-6);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s;
}

.partner-item:hover {
  border-color: var(--primary);
}

/* ========================================
   Features Section
   ======================================== */

.features-section {
  padding: var(--space-16) var(--space-4);
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.section-description {
  font-size: 18px;
  color: var(--text-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  padding: var(--space-6);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-md);
  color: white;
  margin-bottom: var(--space-4);
}

.feature-icon.purple {
  background: linear-gradient(135deg, #a855f7, #7c3aed);
}

.feature-icon.pink {
  background: linear-gradient(135deg, #ec4899, #db2777);
}

.feature-icon.cyan {
  background: linear-gradient(135deg, #06b6d4, #0891b2);
}

.feature-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.feature-description {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   Download Section
   ======================================== */

.download-section {
  padding: var(--space-16) var(--space-4);
  background: var(--hero-gradient);
  text-align: center;
}

.download-container {
  max-width: 600px;
  margin: 0 auto;
}

.download-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.download-description {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
}

.download-buttons {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.download-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

[data-theme="dark"] .download-btn {
  background: #f1f5f9;
  color: #0f172a;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .download-btn {
    background: #f1f5f9;
    color: #0f172a;
  }
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.download-btn-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.download-btn-label {
  font-size: 12px;
  opacity: 0.7;
}

.download-btn-platform {
  font-size: 18px;
  font-weight: 600;
}

.download-note {
  font-size: 13px;
  color: var(--text-muted);
}

/* ========================================
   Footer
   ======================================== */

.footer {
  padding: var(--space-8) var(--space-4);
  border-top: 1px solid var(--border-color);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  color: var(--text-primary);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-copyright {
  font-size: 13px;
  color: var(--text-muted);
}

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

::selection {
  background: rgba(102, 126, 234, 0.2);
}

/* ========================================
   Theme Transition Animation
   ======================================== */

/* Circle overlay for theme transition */
.theme-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  clip-path: circle(0px at var(--x) var(--y));
  transition: clip-path 0.5s ease-in-out;
}

.theme-transition-overlay.expanding {
  clip-path: circle(var(--max-radius) at var(--x) var(--y));
}

/* View Transitions API (for supported browsers) */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-old(root) {
  z-index: 1;
}

::view-transition-new(root) {
  z-index: 9999;
  animation: circle-reveal 0.5s ease-in-out;
}

@keyframes circle-reveal {
  from {
    clip-path: circle(0px at var(--transition-x, 50%) var(--transition-y, 50%));
  }
  to {
    clip-path: circle(150% at var(--transition-x, 50%) var(--transition-y, 50%));
  }
}

/* Disable animation for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  .theme-transition-overlay {
    transition: none;
  }
  
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
  }
}