/**
 * Scamscan Website Styles
 * Material Design 3 inspired
 */

:root {
  /* Light Theme */
  --primary: #1976d2;
  --on-primary: #ffffff;
  --primary-container: #bbdefb;
  --on-primary-container: #001d36;

  --surface: #fafafa;
  --on-surface: #1c1b1f;
  --surface-variant: #e7e0ec;
  --surface-container: #f3edf7;
  --surface-container-high: #ece6f0;
  --on-surface-variant: #49454f;
  --outline: #79747e;
  --outline-variant: #cac4d0;

  --background: #f5f5f5;
  --background-gradient-start: #e8eaf6;
  --background-gradient-end: #f5f5f5;

  /* Risk Colors */
  --risk-safe: #4caf50;
  --risk-safe-light: #81c784;
  --risk-safe-container: #e8f5e9;
  --risk-safe-on-container: #1b5e20;

  --risk-warning: #ff9800;
  --risk-warning-light: #ffb74d;
  --risk-warning-container: #fff3e0;
  --risk-warning-on-container: #e65100;

  --risk-danger: #f44336;
  --risk-danger-light: #e57373;
  --risk-danger-container: #ffebee;
  --risk-danger-on-container: #b71c1c;

  /* Typography */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    Roboto, sans-serif;
  --font-family-jp: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans',
    Meiryo, sans-serif;

  --display-large: 57px / 64px;
  --display-medium: 45px / 52px;
  --display-small: 36px / 44px;

  --headline-large: 32px / 40px 600;
  --headline-medium: 28px / 36px 600;
  --headline-small: 24px / 32px 600;

  --title-large: 22px / 28px 500;
  --title-medium: 16px / 24px 500;
  --title-small: 14px / 20px 500;

  --body-large: 16px / 24px 400;
  --body-medium: 14px / 20px 400;
  --body-small: 12px / 16px 400;

  --label-large: 14px / 20px 500;
  --label-medium: 12px / 16px 500;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  --spacing-xxxl: 64px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-2: 0 2px 6px rgba(0, 0, 0, 0.08);
  --shadow-3: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-4: 0 6px 10px rgba(0, 0, 0, 0.12);
  --shadow-5: 0 8px 12px rgba(0, 0, 0, 0.14);

  /* Transitions */
  --transition-fast: 100ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme='dark'] {
  --primary: #90caf9;
  --on-primary: #003258;
  --primary-container: #004a77;
  --on-primary-container: #d1e4ff;

  --surface: #0d1117;
  --on-surface: #e6e1e5;
  --surface-variant: #1c2128;
  --surface-container: #161b22;
  --surface-container-high: #21262d;
  --on-surface-variant: #cac4d0;
  --outline: #938f99;
  --outline-variant: #49454f;

  --background: #010409;
  --background-gradient-start: #0d1117;
  --background-gradient-end: #010409;

  --risk-safe-container: #1b3a1e;
  --risk-safe-on-container: #a5d6a7;

  --risk-warning-container: #3d2e1a;
  --risk-warning-on-container: #ffcc80;

  --risk-danger-container: #3d1a1a;
  --risk-danger-on-container: #ef9a9a;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  background: linear-gradient(
    135deg,
    var(--background-gradient-start),
    var(--background-gradient-end)
  );
  color: var(--on-surface);
  line-height: 1.5;
  min-height: 100vh;
}

[lang='ja'] body {
  font-family: var(--font-family-jp);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.2;
}

.display-large {
  font-size: 57px;
  line-height: 64px;
  font-weight: 400;
  letter-spacing: -0.25px;
}

.display-medium {
  font-size: 45px;
  line-height: 52px;
  font-weight: 400;
}

.headline-large {
  font-size: 32px;
  line-height: 40px;
  font-weight: 600;
}

.headline-medium {
  font-size: 28px;
  line-height: 36px;
  font-weight: 600;
}

.headline-small {
  font-size: 24px;
  line-height: 32px;
  font-weight: 600;
}

.title-large {
  font-size: 22px;
  line-height: 28px;
  font-weight: 500;
}

.title-medium {
  font-size: 16px;
  line-height: 24px;
  font-weight: 500;
}

.body-large {
  font-size: 16px;
  line-height: 24px;
}

.body-medium {
  font-size: 14px;
  line-height: 20px;
}

.label-large {
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
}

.label-medium {
  font-size: 12px;
  line-height: 16px;
  font-weight: 500;
}

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

section {
  padding: var(--spacing-xxl) 0;
}

/* Header */
header {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--outline-variant);
}

[data-theme='dark'] header {
  background: rgba(13, 17, 23, 0.8);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--on-surface);
}

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

.logo-text {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

nav ul {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

nav a {
  color: var(--on-surface);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.lang-switch {
  display: flex;
  gap: var(--spacing-xs);
}

.lang-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--outline);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--on-surface);
  cursor: pointer;
  font-size: var(--label-medium);
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

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

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--spacing-xxxl) var(--spacing-md);
  background: linear-gradient(
    135deg,
    rgba(25, 118, 210, 0.1),
    rgba(144, 202, 249, 0.1)
  );
}

.hero-icon {
  width: 120px;
  height: 120px;
  margin-bottom: var(--spacing-lg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-3);
}

.hero h1 {
  font-size: clamp(36px, 6vw, 57px);
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.hero p {
  font-size: clamp(16px, 2vw, 20px);
  margin-bottom: var(--spacing-xl);
  color: var(--on-surface-variant);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.download-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  font-size: var(--body-medium);
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: var(--shadow-2);
}

.btn-primary:hover {
  background: var(--primary-container);
  color: var(--on-primary-container);
  transform: translateY(-2px);
  box-shadow: var(--shadow-3);
}

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

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

.btn svg {
  width: 20px;
  height: 20px;
}

/* Features */
.features {
  background: var(--surface);
}

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

.feature-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-3);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--primary-container);
  color: var(--on-primary-container);
  margin-bottom: var(--spacing-md);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
}

.feature-card h3 {
  font-size: var(--title-large);
  margin-bottom: var(--spacing-sm);
  color: var(--on-surface);
}

.feature-card p {
  color: var(--on-surface-variant);
}

/* How to Use */
.how-to-use {
  counter-reset: step;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.step {
  position: relative;
  padding: var(--spacing-lg);
  background: var(--surface-container);
  border-radius: var(--radius-lg);
  border: 1px solid var(--outline-variant);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: -16px;
  left: var(--spacing-md);
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--label-large);
}

.step h3 {
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

/* Screenshots */
.screenshots {
  background: var(--surface);
}

.screenshot-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.screenshot {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  background: var(--surface-container);
  transition: all var(--transition-normal);
}

.screenshot:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-4);
}

.screenshot img {
  width: 100%;
  height: auto;
  display: block;
}

.screenshot-caption {
  padding: var(--spacing-md);
  text-align: center;
  color: var(--on-surface-variant);
  font-size: var(--body-small);
}

/* Privacy */
.privacy-section {
  background: var(--surface);
  text-align: center;
}

.privacy-content {
  max-width: 800px;
  margin: 0 auto;
}

.privacy-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.privacy-feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.privacy-feature svg {
  width: 40px;
  height: 40px;
  color: var(--risk-safe);
}

.privacy-feature span {
  color: var(--on-surface-variant);
}

/* Footer */
footer {
  background: var(--surface-container);
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--outline-variant);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.footer-section h4 {
  margin-bottom: var(--spacing-md);
  color: var(--on-surface);
}

.footer-section ul {
  list-style: none;
}

.footer-section a {
  color: var(--on-surface-variant);
  text-decoration: none;
  display: block;
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--outline-variant);
  color: var(--on-surface-variant);
  font-size: var(--body-small);
}

/* Risk Colors */
.risk-safe {
  color: var(--risk-safe);
  background: var(--risk-safe-container);
}

.risk-warning {
  color: var(--risk-warning);
  background: var(--risk-warning-container);
}

.risk-danger {
  color: var(--risk-danger);
  background: var(--risk-danger-container);
}

/* Mobile Navigation */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--outline-variant);
  }

  nav.active {
    display: block;
  }

  nav ul {
    flex-direction: column;
  }

  .lang-switch {
    justify-content: center;
  }

  .download-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }
}

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

.fade-in-up {
  animation: fadeInUp var(--transition-slow) ease-out;
}

/* Utility */
.text-center {
  text-align: center;
}

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

.mt-md {
  margin-top: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}