/* ==========================================================
   Fueltide Design System
   Athletic, modern, minimal dark theme
   ========================================================== */

/* --- Font Faces (self-hosted for GDPR) --- */
@font-face {
  font-family: 'Oswald';
  src: url('../fonts/Oswald-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Oswald';
  src: url('../fonts/Oswald-SemiBold.ttf') format('truetype');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-Medium.ttf') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-SemiBold.ttf') format('truetype');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* --- Custom Properties --- */
:root {
  /* Background */
  --bg: #0D0D0D;
  --surface: #1A1A1A;
  --surface-high: #252525;

  /* Primary */
  --primary: #00BFFF;
  --primary-dark: #0099CC;
  --primary-light: #33CCFF;

  /* Status */
  --success: #00E676;
  --warning: #FF9100;
  --error: #FF5252;

  /* Text */
  --text-primary: #FFFFFF;
  --text-secondary: #B3B3B3;
  --text-tertiary: #808080;

  /* Borders */
  --border: #404040;
  --border-subtle: #2A2A2A;

  /* Radius */
  --radius: 8px;
  --radius-lg: 16px;

  /* Typography */
  --font-heading: 'Oswald', sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

/* --- Typography --- */
h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin-bottom: 1.5rem;
}

h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  margin-bottom: 0.75rem;
}

p {
  color: var(--text-secondary);
  max-width: 65ch;
}

/* --- Layout --- */
.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 13, 13, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  height: var(--nav-height);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.2s ease;
}

.logo img {
  border-radius: 6px;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.2s ease;
}

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

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-height) + 2rem) 1.5rem 4rem;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 60% 50% at 50% 40%, rgba(0, 191, 255, 0.08) 0%, transparent 70%),
    var(--bg);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    linear-gradient(180deg, transparent 60%, var(--bg) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-content h1 {
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Utility Classes: Shiny Product --- */
.gradient-text {
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 50%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glow {
  box-shadow: 0 0 24px rgba(0, 191, 255, 0.35);
}

.glass {
  background: rgba(26, 26, 26, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.animated {
  animation: fadeInUp 0.8s ease both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 191, 255, 0.25); }
  50% { box-shadow: 0 0 36px rgba(0, 191, 255, 0.45); }
}

/* --- Feature Icon --- */
.feature-icon {
  width: 40px;
  height: 40px;
  color: var(--primary);
  margin-bottom: 1rem;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  padding: 0.875rem 2.25rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.25s ease;
}

.btn-primary {
  background: var(--primary);
  color: var(--bg);
  box-shadow: 0 0 20px rgba(0, 191, 255, 0.25);
}

.btn-primary:hover {
  background: var(--primary-light);
  color: var(--bg);
  box-shadow: 0 0 30px rgba(0, 191, 255, 0.4);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: rgba(0, 191, 255, 0.1);
  color: var(--primary-light);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Features Section --- */
.features {
  padding: 6rem 0;
  background: var(--bg);
}

.features h2 {
  text-align: center;
  margin-bottom: 3rem;
}

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

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: var(--primary);
  box-shadow: 0 0 24px rgba(0, 191, 255, 0.1);
  transform: translateY(-4px);
}

.feature-card h3 {
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --- How It Works / Steps --- */
.how-it-works {
  padding: 6rem 0;
  background: var(--surface);
}

.how-it-works h2 {
  text-align: center;
  margin-bottom: 3rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  counter-reset: step;
}

.step {
  text-align: center;
  padding: 2rem 1.5rem;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(0, 191, 255, 0.12);
  border: 2px solid var(--primary);
  color: var(--primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.step h3 {
  color: var(--text-primary);
}

.step p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin: 0 auto;
}

/* --- CTA Section --- */
.cta-section {
  padding: 6rem 0;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
}

.cta-section h2 {
  color: var(--bg);
}

.cta-section p {
  color: rgba(13, 13, 13, 0.8);
  font-size: 1.125rem;
  margin: 0 auto 2rem;
}

.cta-section .btn-primary {
  background: var(--bg);
  color: var(--primary);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.cta-section .btn-primary:hover {
  background: var(--surface);
  color: var(--primary-light);
  transform: translateY(-2px);
}

/* --- Metrics Section --- */
.metrics {
  padding: 5rem 0;
  background: var(--bg);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.metric-card {
  text-align: center;
  padding: 2.5rem 1.5rem;
  border-radius: var(--radius-lg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 24px rgba(0, 191, 255, 0.12);
}

.metric-number {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.5rem;
}

.metric-label {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  font-weight: 500;
}

@media (max-width: 968px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Tables (Privacy Policy) --- */
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9375rem;
}

.page-content th,
.page-content td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.page-content th {
  color: var(--text-primary);
  font-weight: 600;
  background: var(--surface-high);
  border-bottom-color: var(--border);
}

.page-content tr:hover td {
  background: rgba(0, 191, 255, 0.03);
}

/* --- Metric Icons --- */
.metric-icon {
  width: 36px;
  height: 36px;
  color: var(--primary);
  margin-bottom: 1rem;
  opacity: 0.7;
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- Page Content (Impressum, Privacy) --- */
.page-content {
  padding: calc(var(--nav-height) + 3rem) 0 4rem;
  min-height: 100vh;
}

.page-content h1 {
  margin-bottom: 2rem;
  font-size: clamp(2rem, 4vw, 3rem);
}

.page-content h2 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.page-content h3 {
  font-size: 1.125rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.page-content p,
.page-content li {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 0.75rem;
}

.page-content ul,
.page-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.page-content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

/* --- Footer --- */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 0;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-logo img {
  border-radius: 4px;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-top: 0.25rem;
}

.footer-nav {
  display: flex;
  gap: 2rem;
}

.footer-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

/* --- Responsive: Tablet --- */
@media (max-width: 968px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps .step:last-child {
    grid-column: 1 / -1;
    max-width: 400px;
    margin: 0 auto;
  }
}

/* --- Responsive: Mobile --- */
@media (max-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr;
  }

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

  .steps .step:last-child {
    grid-column: auto;
    max-width: none;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a {
    font-size: 0.8125rem;
  }

  .hero {
    min-height: 90vh;
    padding-top: calc(var(--nav-height) + 1rem);
  }

  .feature-card {
    padding: 1.5rem;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }

  .footer-nav {
    justify-content: center;
  }
}