/* ============================================================
   Seamless 无隙 — Official Website Stylesheet
   Four-Theme Color System + Animations + Responsive
   ============================================================ */

/* ------------------------------
   1. CSS Variables — Default Theme
   ------------------------------ */
:root {
  /* 糯米雪糕 (Rice Cream) — Default */
  --theme-name: '糯米雪糕';
  --color-1: #67B3DB;
  --color-2: #9EDAF1;
  --color-3: #CDEEF8;
  --color-4: #FFFBDD;

  /* Derived palette */
  --primary:       var(--color-1);
  --primary-dark:  #4A9CC5;
  --primary-light: var(--color-2);
  --secondary:     var(--color-3);
  --accent:        var(--color-2);
  --bg-light:      var(--color-4);
  --bg-lighter:    #FFFFFF;

  /* Text */
  --text-dark:     #1a1a2e;
  --text-muted:    #555;
  --text-light:    #fff;
  --text-on-primary: #fff;

  /* UI */
  --gradient-hero: linear-gradient(135deg, var(--color-1) 0%, var(--color-2) 50%, var(--color-3) 100%);
  --gradient-section: linear-gradient(180deg, var(--color-4) 0%, #fff 100%);
  --gradient-card: linear-gradient(135deg, var(--color-3) 0%, var(--color-4) 100%);
  --gradient-footer: linear-gradient(180deg, #1a1a2e 0%, #0d0d1a 100%);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.10);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 40px rgba(103,179,219,0.30);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ------------------------------
   1b. Theme Data Attributes
   ------------------------------ */
[data-theme="strawberry"] {
  --theme-name: '草莓奶霜';
  --color-1: #D8687B;
  --color-2: #D7EAE7;
  --color-3: #FFFBF2;
  --color-4: #FFAFBA;
  --primary:       var(--color-1);
  --primary-dark:  #C05568;
  --primary-light: var(--color-2);
  --secondary:     var(--color-3);
  --accent:        var(--color-4);
  --bg-light:      var(--color-3);
  --gradient-hero: linear-gradient(135deg, var(--color-1) 0%, #E8909A 50%, var(--color-4) 100%);
  --gradient-section: linear-gradient(180deg, var(--color-3) 0%, #fff 100%);
  --gradient-card: linear-gradient(135deg, var(--color-2) 0%, var(--color-3) 100%);
  --shadow-glow: 0 0 40px rgba(216,104,123,0.30);
}

[data-theme="orange"] {
  --theme-name: '桔子汽水';
  --color-1: #FF8D65;
  --color-2: #FFC4AF;
  --color-3: #FFEBD5;
  --color-4: #8FDFE0;
  --primary:       var(--color-1);
  --primary-dark:  #E87A52;
  --primary-light: var(--color-2);
  --secondary:     var(--color-3);
  --accent:        var(--color-4);
  --bg-light:      var(--color-3);
  --gradient-hero: linear-gradient(135deg, var(--color-1) 0%, var(--color-2) 50%, var(--color-4) 100%);
  --gradient-section: linear-gradient(180deg, var(--color-3) 0%, #fff 100%);
  --gradient-card: linear-gradient(135deg, var(--color-2) 0%, var(--color-3) 100%);
  --shadow-glow: 0 0 40px rgba(255,141,101,0.30);
}

[data-theme="lemon"] {
  --theme-name: '咸柠汽水';
  --color-1: #96CAA4;
  --color-2: #C3DC89;
  --color-3: #E3E17C;
  --color-4: #96CFF1;
  --primary:       var(--color-1);
  --primary-dark:  #7AB88A;
  --primary-light: var(--color-2);
  --secondary:     var(--color-3);
  --accent:        var(--color-4);
  --bg-light:      #F8FBE8;
  --gradient-hero: linear-gradient(135deg, var(--color-1) 0%, var(--color-2) 50%, var(--color-4) 100%);
  --gradient-section: linear-gradient(180deg, #F8FBE8 0%, #fff 100%);
  --gradient-card: linear-gradient(135deg, var(--color-2) 0%, var(--color-3) 100%);
  --shadow-glow: 0 0 40px rgba(150,202,164,0.30);
}

/* ------------------------------
   2. Base & Reset
   ------------------------------ */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-dark);
  background: #fff;
  overflow-x: hidden;
  transition: background var(--transition-smooth), color var(--transition-smooth);
  line-height: 1.7;
}

::selection {
  background: var(--primary);
  color: #fff;
}

/* ------------------------------
   3. Typography
   ------------------------------ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.display-1, .display-2, .display-3 {
  letter-spacing: -0.03em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-1), var(--color-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ------------------------------
   4. Preloader
   ------------------------------ */
#preloader {
  position: fixed;
  inset: 0;
  z-index: 99999;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

#preloader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader-content {
  text-align: center;
}

.preloader-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  position: relative;
}

.preloader-logo .ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid transparent;
  animation: preloaderSpin 1.5s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
}

.preloader-logo .ring:nth-child(1) {
  border-top-color: var(--color-1);
  animation-delay: 0s;
}

.preloader-logo .ring:nth-child(2) {
  inset: 8px;
  border-right-color: var(--color-2);
  animation-delay: -0.5s;
}

.preloader-logo .ring:nth-child(3) {
  inset: 16px;
  border-bottom-color: var(--color-3);
  animation-delay: -1s;
}

@keyframes preloaderSpin {
  0%   { transform: rotate(0deg); }
  50%  { transform: rotate(180deg); }
  100% { transform: rotate(360deg); }
}

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

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* ------------------------------
   6. Navigation
   ------------------------------ */
.navbar {
  padding: 16px 0;
  transition: all var(--transition-smooth);
  z-index: 1030;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
}

.navbar.scrolled {
  padding: 8px 0;
  background: rgba(255,255,255,0.92) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
}

.navbar-brand {
  font-weight: 800;
  font-size: 1.6rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand .brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--gradient-hero);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  transition: transform var(--transition-bounce);
}

.navbar-brand:hover .brand-icon {
  transform: rotate(-10deg) scale(1.1);
}

.nav-link {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-dark) !important;
  padding: 8px 16px !important;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform var(--transition-smooth);
  border-radius: 1px;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

/* Theme Switcher in Nav */
.theme-switcher {
  display: flex;
  gap: 4px;
  background: #f0f0f0;
  border-radius: 50px;
  padding: 4px;
}

.theme-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-bounce);
  position: relative;
}

.theme-dot:hover {
  transform: scale(1.2);
}

.theme-dot.active {
  border-color: var(--text-dark);
  box-shadow: 0 0 0 3px rgba(0,0,0,0.1);
}

.theme-dot.rice   { background: linear-gradient(135deg, #67B3DB, #9EDAF1); }
.theme-dot.strawberry { background: linear-gradient(135deg, #D8687B, #FFAFBA); }
.theme-dot.orange { background: linear-gradient(135deg, #FF8D65, #FFC4AF); }
.theme-dot.lemon  { background: linear-gradient(135deg, #96CAA4, #C3DC89); }

/* Lang Switch */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
  padding: 6px 14px;
  border-radius: 50px;
  background: #f0f0f0;
  transition: all var(--transition-fast);
  border: none;
}

.lang-switch:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}

.lang-switch i {
  font-size: 0.9rem;
}

/* ------------------------------
   7. Hero Carousel (Full-Width Marquee)
   ------------------------------ */
.hero-carousel {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 700px;
  overflow: hidden;
}

.carousel-slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.carousel-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1s ease-in-out, transform 1s ease-in-out;
  transform: scale(1.05);
  display: flex;
  align-items: center;
  justify-content: center;
}

.carousel-slide.active {
  opacity: 1;
  transform: scale(1);
}

.carousel-slide .slide-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.carousel-slide:nth-child(1) .slide-bg { background: var(--gradient-hero); }
.carousel-slide:nth-child(2) .slide-bg {
  background: linear-gradient(135deg, var(--color-2) 0%, var(--color-1) 50%, var(--color-3) 100%);
}
.carousel-slide:nth-child(3) .slide-bg {
  background: linear-gradient(135deg, var(--color-3) 0%, var(--color-1) 50%, var(--color-2) 100%);
}

/* Floating orbs */
.carousel-slide .orb {
  position: absolute;
  border-radius: 50%;
  opacity: 0.15;
  filter: blur(60px);
}

.carousel-slide .orb-1 {
  width: 400px; height: 400px;
  background: var(--color-4);
  top: -100px; right: -100px;
  animation: floatOrb 8s ease-in-out infinite;
}

.carousel-slide .orb-2 {
  width: 300px; height: 300px;
  background: var(--color-2);
  bottom: -80px; left: -60px;
  animation: floatOrb 10s ease-in-out infinite reverse;
}

.carousel-slide .orb-3 {
  width: 200px; height: 200px;
  background: var(--color-1);
  top: 50%; left: 50%;
  animation: floatOrb 12s ease-in-out infinite 2s;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25%  { transform: translate(30px, -30px) scale(1.1); }
  50%  { transform: translate(-20px, 20px) scale(0.95); }
  75%  { transform: translate(20px, 10px) scale(1.05); }
}

/* Grid pattern overlay */
.carousel-slide .grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 1;
}

.carousel-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  max-width: 800px;
  padding: 0 20px;
}

.carousel-content .hero-badge {
  display: inline-block;
  padding: 8px 24px;
  border-radius: 50px;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(10px);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease-out;
}

.carousel-content h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease-out 0.15s both;
  text-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.carousel-content .hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.3rem);
  opacity: 0.9;
  margin-bottom: 36px;
  animation: fadeInUp 0.8s ease-out 0.3s both;
  line-height: 1.8;
}

.carousel-content .hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.45s both;
}

/* Floating devices visual */
.carousel-devices {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  gap: 20px;
  align-items: flex-end;
}

.carousel-devices .device-icon {
  font-size: 2.5rem;
  color: rgba(255,255,255,0.7);
  animation: deviceBounce 3s ease-in-out infinite;
  transition: all var(--transition-bounce);
  cursor: default;
}

.carousel-devices .device-icon:nth-child(1) { animation-delay: 0s; font-size: 2rem; }
.carousel-devices .device-icon:nth-child(2) { animation-delay: 0.2s; font-size: 2.8rem; }
.carousel-devices .device-icon:nth-child(3) { animation-delay: 0.4s; font-size: 3.2rem; }
.carousel-devices .device-icon:nth-child(4) { animation-delay: 0.6s; font-size: 2.5rem; }
.carousel-devices .device-icon:nth-child(5) { animation-delay: 0.8s; font-size: 2.2rem; }
.carousel-devices .device-icon:nth-child(6) { animation-delay: 1.0s; font-size: 2.6rem; }
.carousel-devices .device-icon:nth-child(7) { animation-delay: 1.2s; font-size: 1.8rem; }

@keyframes deviceBounce {
  0%, 100% { transform: translateY(0); }
  50%  { transform: translateY(-15px); }
}

/* Carousel indicators */
.carousel-indicators-custom {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  gap: 12px;
}

.carousel-indicators-custom button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.6);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-bounce);
  padding: 0;
}

.carousel-indicators-custom button.active {
  background: #fff;
  border-color: #fff;
  box-shadow: 0 0 12px rgba(255,255,255,0.5);
  width: 36px;
  border-radius: 6px;
}

/* Scroll-down indicator */
.scroll-indicator {
  position: absolute;
  bottom: 100px;
  right: 40px;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.7);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  animation: fadeIn 1s ease-out 1s both;
}

.scroll-indicator .mouse {
  width: 24px;
  height: 40px;
  border: 2px solid rgba(255,255,255,0.6);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator .mouse::after {
  content: '';
  position: absolute;
  width: 4px;
  height: 8px;
  background: #fff;
  border-radius: 2px;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 1.5s ease-in-out infinite;
}

@keyframes scrollWheel {
  0%   { opacity: 1; top: 8px; }
  100% { opacity: 0; top: 24px; }
}

/* ------------------------------
   8. Buttons
   ------------------------------ */
.btn {
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 50px;
  transition: all var(--transition-bounce);
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

.btn-outline-light {
  border: 2px solid rgba(255,255,255,0.7);
  color: #fff;
  background: transparent;
}

.btn-outline-light:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
  transform: translateY(-2px);
  color: #fff;
}

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

.btn-outline-primary:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.btn-glow {
  box-shadow: 0 0 20px rgba(103,179,219,0.4);
}

.btn-glow:hover {
  box-shadow: 0 0 40px rgba(103,179,219,0.6);
}

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

@keyframes ripple {
  to { transform: scale(4); opacity: 0; }
}

/* ------------------------------
   9. Section Common Styles
   ------------------------------ */
.section {
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header .section-badge {
  display: inline-block;
  padding: 6px 20px;
  border-radius: 50px;
  background: var(--secondary);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 16px;
  font-weight: 800;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Section backgrounds */
.section-light {
  background: var(--gradient-section);
}

.section-dark {
  background: #1a1a2e;
  color: #fff;
}

.section-dark .section-header p {
  color: rgba(255,255,255,0.6);
}

/* ------------------------------
   10. Feature Cards
   ------------------------------ */
.feature-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
  height: 100%;
  border: 1px solid transparent;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--gradient-hero);
  transform: scaleX(0);
  transition: transform var(--transition-smooth);
  transform-origin: left;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

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

.feature-card .feature-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--primary);
  margin-bottom: 20px;
  transition: all var(--transition-bounce);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(-5deg);
  box-shadow: var(--shadow-glow);
}

.feature-card h4 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  font-weight: 700;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0;
}

/* ------------------------------
   11. Platform Grid
   ------------------------------ */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
}

.platform-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
  cursor: default;
  border: 1px solid #eee;
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.platform-card .platform-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
  transition: transform var(--transition-bounce);
}

.platform-card:hover .platform-icon {
  transform: scale(1.15);
}

.platform-card .platform-name {
  font-weight: 700;
  font-size: 0.95rem;
  margin: 0;
}

.platform-card .platform-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ------------------------------
   12. Stats Counter
   ------------------------------ */
.stats-section {
  padding: 80px 0;
}

.stat-item {
  text-align: center;
  padding: 20px;
}

.stat-number {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: 8px;
}

/* ------------------------------
   13. OSS & Deployment Cards
   ------------------------------ */
.integration-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px 30px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-smooth);
  height: 100%;
  text-align: center;
  border: 1px solid #eee;
}

.integration-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.integration-card .integration-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: var(--gradient-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  color: var(--primary);
  transition: all var(--transition-bounce);
}

.integration-card:hover .integration-icon {
  transform: rotateY(180deg);
}

.integration-card h4 {
  font-weight: 700;
  margin-bottom: 12px;
}

.integration-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ------------------------------
   14. API / SDK Section
   ------------------------------ */
.code-block {
  background: #1e1e2e;
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.code-block::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-hero);
}

.code-block pre {
  margin: 0;
  color: #cdd6f4;
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.9rem;
  line-height: 1.8;
}

.code-block .comment { color: #6c7086; }
.code-block .keyword { color: #cba6f7; }
.code-block .string  { color: #a6e3a1; }
.code-block .func    { color: #89b4fa; }
.code-block .var     { color: #f9e2af; }

.lang-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.lang-tab {
  padding: 8px 20px;
  border-radius: 50px;
  border: 1px solid #ddd;
  background: #fff;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ------------------------------
   15. Download Section
   ------------------------------ */
.download-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
  border: 1px solid #eee;
  height: 100%;
}

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

.download-card.featured {
  border: 2px solid var(--primary);
  position: relative;
  transform: scale(1.03);
}

.download-card.featured:hover { transform: scale(1.05); }

.download-card.featured .featured-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 18px;
  border-radius: 50px;
  background: var(--primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
}

.download-card .download-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  color: var(--primary);
}

.download-card h4 {
  font-weight: 700;
  margin-bottom: 8px;
}

.download-card .version {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* ------------------------------
   16. Testimonial / Trust
   ------------------------------ */
.trust-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  padding: 40px 0;
  opacity: 0.6;
}

.trust-bar span {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ------------------------------
   17. Footer
   ------------------------------ */
.footer {
  background: var(--gradient-footer);
  color: rgba(255,255,255,0.7);
  padding: 80px 0 30px;
}

.footer h5 {
  color: #fff;
  font-weight: 700;
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.footer a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-size: 0.9rem;
}

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

.footer .footer-brand {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}

.footer .footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 50px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}

.footer .social-icons {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.footer .social-icons a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-bounce);
  font-size: 1rem;
}

.footer .social-icons a:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-3px);
}

/* ------------------------------
   18. Back to Top
   ------------------------------ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-bounce);
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ------------------------------
   19. Theme Panel (Side)
   ------------------------------ */
.theme-panel {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1040;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-smooth);
}

.theme-panel.collapsed {
  transform: translateY(-50%) translateX(calc(100% - 12px));
}

.theme-panel-toggle {
  position: absolute;
  left: -30px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  border: none;
  background: rgba(255,255,255,0.85);
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.theme-panel .theme-option {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-bounce);
}

.theme-panel .theme-option:hover {
  transform: scale(1.2);
}

.theme-panel .theme-option.active {
  border-color: var(--text-dark);
  box-shadow: 0 0 12px rgba(0,0,0,0.2);
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

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

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(40px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* AOS-like scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* delay modifiers */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }

/* Floating animation */
.float-anim {
  animation: floatAnim 6s ease-in-out infinite;
}

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

/* Pulse glow */
.pulse-glow {
  animation: pulseGlow 2s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(103,179,219,0.2); }
  50%  { box-shadow: 0 0 40px rgba(103,179,219,0.5); }
}

/* ------------------------------
   21. Particles Canvas
   ------------------------------ */
#particles-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.4;
}

/* ------------------------------
   22. Workflow Steps
   ------------------------------ */
.workflow-steps {
  display: flex;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.workflow-step {
  text-align: center;
  flex: 1;
  min-width: 200px;
  padding: 24px;
  position: relative;
}

.workflow-step::after {
  content: '';
  position: absolute;
  top: 48px;
  right: -20px;
  width: 40px;
  height: 2px;
  background: var(--primary-light);
}

.workflow-step:last-child::after { display: none; }

.workflow-step .step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-hero);
  color: #fff;
  font-weight: 800;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.workflow-step h5 {
  font-weight: 700;
  margin-bottom: 8px;
}

.workflow-step p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ------------------------------
   23. Responsive
   ------------------------------ */
@media (max-width: 1200px) {
  .workflow-step::after { display: none; }
}

@media (max-width: 992px) {
  .section { padding: 70px 0; }
  .hero-carousel { min-height: 600px; }
  .carousel-devices { display: none; }
  .platform-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
  .scroll-indicator { display: none; }
  .theme-panel { display: none; }
}

@media (max-width: 768px) {
  .section { padding: 50px 0; }
  .hero-carousel { height: 90vh; min-height: 500px; }
  .carousel-content h1 { font-size: 2rem; }
  .carousel-content .hero-subtitle { font-size: 0.95rem; }
  .carousel-content .hero-btns { flex-direction: column; align-items: center; }
  .download-card.featured { transform: none; }
  .download-card.featured:hover { transform: translateY(-6px); }
  .platform-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
}

@media (max-width: 576px) {
  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .navbar-brand { font-size: 1.3rem; }
  .btn-lg { padding: 12px 24px; font-size: 0.95rem; }
}

/* ------------------------------
   24. Print
   ------------------------------ */
@media print {
  .navbar, .back-to-top, .theme-panel, .hero-carousel { display: none; }
  body { color: #000; }
}