/* ===================================
   SicBoTracker Website - Dark Theme
   =================================== */

:root {
  /* Color palette - matches the Android app */
  --color-background: #121212;
  --color-surface: #1E1E1E;
  --color-surface-variant: #2D2D2D;
  --color-primary: #BB86FC;
  --color-primary-variant: #3700B3;
  --color-secondary: #03DAC6;
  --color-error: #CF6679;
  --color-on-background: #E1E1E1;
  --color-on-surface: #E1E1E1;
  --color-on-primary: #000000;
  --color-on-secondary: #000000;

  /* Typography */
  --font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
}

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

/* Base */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-background);
  color: var(--color-on-background);
  line-height: 1.6;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-on-surface);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--spacing-md);
}

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

a:hover {
  color: var(--color-secondary);
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.header {
  background-color: var(--color-surface);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-on-surface);
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

/* Navigation */
.nav {
  display: flex;
  gap: var(--spacing-lg);
}

.nav a {
  color: var(--color-on-surface);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.nav a:hover {
  background-color: var(--color-surface-variant);
  color: var(--color-primary);
}

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

/* Hero Section */
.hero {
  padding: var(--spacing-xxl) 0;
  text-align: center;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-background) 100%);
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--color-on-surface);
  opacity: 0.8;
  margin-bottom: var(--spacing-xl);
}

.hero .app-icon {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-xl);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-variant);
  color: var(--color-on-surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

/* Features Section */
.features {
  padding: var(--spacing-xxl) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-xl);
}

.feature-card .icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

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

/* Screenshots */
.screenshots {
  padding: var(--spacing-xxl) 0;
  background-color: var(--color-surface);
}

.screenshot-grid {
  display: flex;
  gap: var(--spacing-lg);
  overflow-x: auto;
  padding: var(--spacing-md) var(--spacing-lg);
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.screenshot-grid img {
  max-height: 500px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  scroll-snap-align: center;
}

/* Tutorial Page */
.tutorial-section {
  padding: var(--spacing-xxl) 0;
}

.tutorial-section .container {
  max-width: 900px;
}

.tutorial-step {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  margin-bottom: var(--spacing-xxl);
}

.tutorial-step:nth-child(even) {
  direction: rtl;
}

.tutorial-step:nth-child(even) > * {
  direction: ltr;
}

.tutorial-step img {
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: 50%;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

/* Privacy Page */
.privacy-content {
  padding: var(--spacing-xxl) 0;
}

.privacy-content h2 {
  color: var(--color-primary);
  margin-top: var(--spacing-xl);
}

.privacy-content ul {
  margin-left: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.privacy-content li {
  margin-bottom: var(--spacing-sm);
}

/* Footer */
.footer {
  background-color: var(--color-surface);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-xxl);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.footer p {
  opacity: 0.7;
  font-size: 0.875rem;
}

/* Responsive */
@media (min-width: 769px) {
  .screenshot-grid {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .header .container {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .nav {
    gap: var(--spacing-md);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .tutorial-step {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .tutorial-step:nth-child(even) {
    direction: ltr;
  }

  .tutorial-content ul,
  .tutorial-content ol {
    text-align: left;
    display: inline-block;
  }

  .tutorial-image {
    display: flex;
    justify-content: center;
  }

  .step-number {
    margin-left: auto;
    margin-right: auto;
  }
}

/* Utilities */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }