/* ==========================================================================
   SleepScreen TV - Design System & Modern CSS (Vanilla CSS, WCAG 2.1 AA)
   ========================================================================== */

:root {
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --bg-dark: #0b0d12;
  --bg-card: #131722;
  --bg-card-hover: #1a2030;
  --bg-card-glass: rgba(19, 23, 34, 0.75);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(59, 130, 246, 0.3);

  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-gold: #f59e0b;
  --accent-green: #10b981;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px rgba(59, 130, 246, 0.25);

  --max-width: 1120px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #151c2e 0%, var(--bg-dark) 70%);
}

/* Accessibility: Focus Visible */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(11, 13, 18, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-text span {
  color: var(--accent-gold);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

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

.btn-header {
  padding: 8px 18px;
  background: linear-gradient(135deg, var(--accent-gold), #d97706);
  color: #000000;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: var(--transition);
}

.btn-header:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

/* Hero Section */
.hero {
  padding: 72px 0 48px;
  text-align: center;
  position: relative;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background-color: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: #93c5fd;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 36px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--accent-gold), #d97706);
  color: #000000;
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  background-color: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.platform-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.platform-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.platform-tag.active {
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.3);
}

/* Banner / Media Preview */
.banner-preview {
  margin: 32px auto 64px;
  max-width: 960px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-glow), var(--shadow-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
}

.banner-preview img {
  width: 100%;
  height: auto;
  display: block;
}

/* Feature Grid */
.features-section {
  padding: 48px 0 72px;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 580px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md);
  background-color: var(--bg-card-hover);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* Feature Visual Showcase */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.showcase-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.showcase-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 255, 255, 0.15);
}

.showcase-card img {
  width: 100%;
  height: auto;
  display: block;
}

.showcase-body {
  padding: 24px;
}

.showcase-body h4 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.showcase-body p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Pricing Card */
.pricing-section {
  padding: 48px 0 72px;
  text-align: center;
}

.pricing-card {
  background: linear-gradient(180deg, var(--bg-card) 0%, #171d2b 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  max-width: 540px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.pricing-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-gold), var(--accent-cyan));
}

.pricing-price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 16px 0 4px;
}

.pricing-price span {
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: 28px 0;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.pricing-features li svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

/* Legal Pages (Impressum & Datenschutz) */
.legal-container {
  padding: 64px 0 96px;
  max-width: 800px;
  margin: 0 auto;
}

.legal-header {
  margin-bottom: 36px;
}

.legal-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.legal-date {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.legal-content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.legal-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--text-primary);
}

.legal-content p, .legal-content ul {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.legal-content ul {
  padding-left: 24px;
}

.legal-content a {
  color: var(--accent-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background-color: #08090d;
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition);
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 48px 0 32px;
  }
  .header-inner {
    flex-direction: column;
    gap: 16px;
  }
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}