:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #0d0d1a;
  --bg-card: #111122;
  --bg-card-hover: #161630;
  --bg-navbar: rgba(10, 10, 10, 0.95);

  --accent-blue: #00aaff;
  --accent-blue-dark: #0088cc;
  --accent-cyan: #00ddff;
  --accent-glow: rgba(0, 170, 255, 0.3);
  --accent-glow-strong: rgba(0, 170, 255, 0.5);

  --text-primary: #f0f0f0;
  --text-secondary: #b0b0c0;
  --text-muted: #666680;

  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-card: rgba(0, 170, 255, 0.15);
  --border-card-hover: rgba(0, 170, 255, 0.35);

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-secondary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-cyan);
}

h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto var(--space-lg);
  text-align: center;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--space-xl) 0;
}

section:nth-child(even) {
  background: var(--bg-secondary);
}

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

/* Navbar */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0.75rem 0;
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar.scrolled {
  background: var(--bg-navbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border-subtle);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
  flex-shrink: 0;
}

.navbar-brand img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.navbar-nav a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.lang-toggle {
  display: flex;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background: var(--accent-blue);
  color: #fff;
}

.lang-btn:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger svg {
  width: 24px;
  height: 24px;
}

/* Mobile nav overlay */

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
  background: rgba(10, 10, 10, 0.98);
  backdrop-filter: blur(12px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
}

.mobile-nav-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-nav-close svg {
  width: 28px;
  height: 28px;
}

/* Hero */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  background: radial-gradient(ellipse at 50% 40%, rgba(0, 100, 180, 0.08) 0%, transparent 70%),
              var(--bg-primary);
}

.hero-content {
  max-width: 700px;
}

.hero-logo {
  width: 320px;
  height: 320px;
  margin: 0 auto var(--space-md);
  border-radius: 50%;
  filter: drop-shadow(0 0 30px rgba(0, 170, 255, 0.25));
}

.hero h1 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  margin-bottom: var(--space-sm);
  font-weight: 700;
}

.hero-tagline {
  color: var(--accent-cyan);
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  margin-top: var(--space-md);
}

.hero-scroll {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: var(--space-lg);
  padding: 0.5rem 1rem;
}

.hero-scroll svg {
  width: 20px;
  height: 20px;
  animation: bounce 2s ease infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.875rem 2rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-blue-dark));
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow-strong);
  filter: brightness(1.1);
}

.btn-large {
  padding: 1.125rem 2.75rem;
  font-size: 1.1875rem;
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.03);
}

/* Feature cards */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--accent-glow);
  border-color: var(--border-card-hover);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  color: var(--accent-blue);
  background: rgba(0, 170, 255, 0.08);
  border-radius: var(--radius-md);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  color: var(--text-primary);
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Use cases */

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.usecase-card {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-normal);
}

.usecase-card:hover {
  border-color: var(--border-card);
}

.usecase-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-blue);
  background: rgba(0, 170, 255, 0.08);
  border-radius: 50%;
}

.usecase-icon svg {
  width: 22px;
  height: 22px;
}

.usecase-card h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.usecase-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Screenshot */

.screenshot-section {
  text-align: center;
}

.screenshot-frame {
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 60px rgba(0, 100, 200, 0.15),
              0 0 0 1px rgba(255, 255, 255, 0.05);
}

.screenshot-frame img {
  width: 100%;
}

.screenshot-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.badge svg {
  width: 14px;
  height: 14px;
  color: var(--accent-blue);
}

/* Stream Deck */

.streamdeck-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.streamdeck-image {
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}

.streamdeck-text h2 {
  text-align: left;
  margin-bottom: var(--space-sm);
}

.streamdeck-text p {
  margin-bottom: var(--space-sm);
}

.streamdeck-features {
  list-style: none;
  margin-top: var(--space-sm);
}

.streamdeck-features li {
  padding: 0.4rem 0;
  padding-left: 1.5rem;
  position: relative;
  font-size: 0.9375rem;
}

.streamdeck-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 8px;
  height: 8px;
  background: var(--accent-blue);
  border-radius: 50%;
}

/* Quick start timeline */

.quickstart-timeline {
  max-width: 650px;
  margin: 0 auto;
  position: relative;
  padding-left: 3.5rem;
}

.quickstart-timeline::before {
  content: '';
  position: absolute;
  left: 1rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-blue), var(--accent-blue-dark), transparent);
}

.qs-step {
  position: relative;
  padding-bottom: 1.75rem;
}

.qs-step:last-child {
  padding-bottom: 0;
}

.qs-number {
  position: absolute;
  left: -3.5rem;
  top: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-blue);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: 50%;
  z-index: 1;
}

.qs-step:last-child .qs-number {
  background: linear-gradient(135deg, #00cc66, #00aa55);
}

.qs-step p {
  font-size: 1rem;
  padding-top: 0.2rem;
}

.qs-tip {
  max-width: 650px;
  margin: var(--space-md) auto 0;
  padding: 1.25rem 1.5rem;
  background: rgba(0, 170, 255, 0.06);
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 0.9375rem;
}

.qs-tip strong {
  color: var(--accent-blue);
}

/* Download */

.download-section {
  text-align: center;
  background: radial-gradient(ellipse at 50% 100%, rgba(0, 100, 180, 0.1) 0%, transparent 60%),
              var(--bg-secondary) !important;
}

.download-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  margin: var(--space-md) 0;
}

.download-detail {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.download-detail svg {
  width: 18px;
  height: 18px;
  color: var(--accent-blue);
}

.download-button-wrapper {
  margin-top: var(--space-md);
}

.download-size {
  display: block;
  margin-top: var(--space-xs);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Footer */

.footer {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

.footer p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0.25rem 0;
}

.footer-logo {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  margin: 0 auto var(--space-sm);
  opacity: 0.6;
}

/* Responsive */

@media (max-width: 1023px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .streamdeck-layout {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .streamdeck-text h2 {
    text-align: center;
  }

  .streamdeck-image {
    max-width: 500px;
    margin: 0 auto;
  }
}

@media (max-width: 767px) {
  section {
    padding: var(--space-lg) 0;
  }

  .navbar-nav {
    display: none;
  }

  .hamburger {
    display: block;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .usecases-grid {
    grid-template-columns: 1fr;
  }

  .hero-logo {
    width: 240px;
    height: 240px;
  }

  .hero h1 {
    font-size: 1.375rem;
  }

  .btn-large {
    padding: 1rem 2rem;
    font-size: 1.0625rem;
  }

  .quickstart-timeline {
    padding-left: 3rem;
  }

  .qs-number {
    left: -3rem;
  }
}