/* ========================================
   SnapID - Premium Support Page Styles
   AI証明写真アプリのサポートページ
   Clean Professional Blue Theme
   ======================================== */

/* CSS Variables - Design Tokens */
:root {
  /* Primary Colors - Trust Blue */
  --color-primary: #2d7dd2;
  --color-primary-light: #5a9de0;
  --color-primary-dark: #1e5fa3;
  --color-primary-container: #d6e8ff;

  /* Secondary Colors - Clean Accent */
  --color-accent: #00b4d8;
  --color-accent-light: #48cae4;
  --color-accent-dark: #0096b7;

  /* Background Colors - Light & Clean */
  --color-bg-primary: #f8faff;
  --color-bg-secondary: #eaf4ff;
  --color-bg-tertiary: #e1ecff;
  --color-bg-card: #ffffff;
  --color-bg-elevated: #ffffff;

  /* Text Colors */
  --color-text-primary: #191c20;
  --color-text-secondary: #454952;
  --color-text-tertiary: #5c6670;
  --color-text-hint: #75788a;

  /* Semantic Colors */
  --color-success: #1e7b2e;
  --color-info: #0077b6;
  --color-warning: #e9a319;
  --color-error: #ba1a1a;

  /* Borders & Overlays */
  --border-subtle: rgba(45, 125, 210, 0.15);
  --border-default: rgba(45, 125, 210, 0.3);
  --overlay-light: rgba(45, 125, 210, 0.08);
  --overlay-scrim: rgba(248, 250, 255, 0.95);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-base: 16px;
  --spacing-lg: 20px;
  --spacing-xl: 24px;
  --spacing-2xl: 32px;
  --spacing-3xl: 40px;
  --spacing-4xl: 48px;
  --spacing-5xl: 64px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    Roboto, sans-serif;
  --font-size-xs: 11px;
  --font-size-sm: 13px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(45, 125, 210, 0.08);
  --shadow-md: 0 4px 16px rgba(45, 125, 210, 0.12);
  --shadow-lg: 0 8px 32px rgba(45, 125, 210, 0.16);
  --shadow-glow: 0 0 24px rgba(45, 125, 210, 0.25);

  /* Transitions */
  --transition-fast: 200ms ease-out;
  --transition-normal: 300ms ease-out;
  --transition-slow: 500ms ease-out;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
      ellipse at 10% 0%,
      rgba(45, 125, 210, 0.12) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 90% 100%,
      rgba(0, 180, 216, 0.08) 0%,
      transparent 50%
    );
  pointer-events: none;
  z-index: -1;
}

/* Floating Shapes Background */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(
      circle at 15% 20%,
      rgba(45, 125, 210, 0.06) 0%,
      transparent 25%
    ),
    radial-gradient(
      circle at 85% 30%,
      rgba(0, 180, 216, 0.05) 0%,
      transparent 20%
    ),
    radial-gradient(
      circle at 50% 80%,
      rgba(45, 125, 210, 0.04) 0%,
      transparent 30%
    );
  pointer-events: none;
  z-index: -1;
}

/* Container */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

/* Header */
.header {
  text-align: center;
  padding: var(--spacing-5xl) 0 var(--spacing-3xl);
  position: relative;
}

.header::before {
  content: '';
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(
    circle,
    rgba(45, 125, 210, 0.1) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.app-icon {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  margin-bottom: var(--spacing-xl);
  position: relative;
  animation: float 6s ease-in-out infinite;
  background: white;
  padding: 4px;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.app-name {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 2px;
  margin-bottom: var(--spacing-sm);
}

.header-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.divider-line {
  width: 60px;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-primary),
    transparent
  );
  border-radius: var(--radius-full);
}

.divider-icon {
  color: var(--color-primary);
  font-size: 18px;
}

.app-tagline {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  letter-spacing: 1px;
  font-weight: 400;
}

/* Badge */
.badge-container {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-primary-container);
  color: var(--color-primary-dark);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.badge svg {
  width: 14px;
  height: 14px;
}

/* Main Content */
.main-content {
  padding: var(--spacing-2xl) 0;
}

/* Section Cards */
.section-card {
  background: var(--color-bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.section-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.section-card:hover {
  border-color: var(--border-default);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.section-card:hover::before {
  opacity: 1;
}

.section-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-base);
  margin-bottom: var(--spacing-lg);
}

.section-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-accent)
  );
  border-radius: var(--radius-md);
  color: white;
  flex-shrink: 0;
}

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

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-primary);
}

.section-content {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* Feature List */
.feature-list {
  list-style: none;
  margin-top: var(--spacing-lg);
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-base) 0;
  border-bottom: 1px solid var(--overlay-light);
  transition: background-color var(--transition-fast);
}

.feature-item:last-child {
  border-bottom: none;
}

.feature-item:hover {
  background: var(--overlay-light);
  margin: 0 calc(-1 * var(--spacing-base));
  padding-left: var(--spacing-base);
  padding-right: var(--spacing-base);
  border-radius: var(--radius-md);
}

.feature-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
}

.feature-text {
  flex: 1;
}

.feature-title {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.feature-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  line-height: 1.6;
}

/* Steps Section */
.steps-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-base);
  margin-top: var(--spacing-lg);
}

.step-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-base);
  padding: var(--spacing-base);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.step-item:hover {
  background: var(--color-primary-container);
}

.step-number {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-primary-dark)
  );
  color: white;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-title {
  font-weight: 600;
  color: var(--color-text-primary);
}

.step-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

/* Contact Section */
.contact-section {
  text-align: center;
  background: linear-gradient(
    135deg,
    var(--color-bg-card),
    var(--color-bg-secondary)
  );
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: var(--spacing-3xl);
  margin-top: var(--spacing-2xl);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.contact-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--color-primary),
    var(--color-accent),
    var(--color-primary)
  );
}

.contact-section::after {
  content: '';
  position: absolute;
  bottom: -50%;
  right: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(
    circle,
    rgba(45, 125, 210, 0.08) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.contact-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-base);
  position: relative;
}

.contact-desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-primary-dark)
  );
  color: white;
  padding: var(--spacing-base) var(--spacing-2xl);
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-normal);
  position: relative;
  box-shadow: 0 4px 16px rgba(45, 125, 210, 0.4);
}

.contact-email:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(45, 125, 210, 0.5);
}

.contact-email:active {
  transform: translateY(-1px);
}

.contact-email svg {
  width: 20px;
  height: 20px;
}

/* Links */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-base);
  margin-top: var(--spacing-xl);
}

.link-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-base) var(--spacing-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--transition-normal);
  font-weight: 500;
}

.link-card:hover {
  background: var(--color-primary-container);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateX(4px);
}

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

/* Footer */
.footer {
  text-align: center;
  padding: var(--spacing-3xl) 0;
  margin-top: var(--spacing-2xl);
  border-top: 1px solid var(--border-subtle);
}

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

.footer-dot {
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  opacity: 0.4;
}

.footer-dot.center {
  width: 10px;
  height: 10px;
  opacity: 0.8;
}

.footer-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  letter-spacing: 1px;
}

.footer-copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-hint);
  margin-top: var(--spacing-base);
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-base);
  }

  .header {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  }

  .app-icon {
    width: 100px;
    height: 100px;
  }

  .app-name {
    font-size: var(--font-size-3xl);
    letter-spacing: 1px;
  }

  .app-tagline {
    font-size: var(--font-size-base);
  }

  .section-card {
    padding: var(--spacing-xl);
  }

  .contact-section {
    padding: var(--spacing-2xl);
  }

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

  .badge-container {
    flex-wrap: wrap;
  }

  .step-item {
    flex-direction: column;
    text-align: center;
  }
}

/* Utility Classes */
.text-primary {
  color: var(--color-primary);
}
.text-accent {
  color: var(--color-accent);
}
.text-muted {
  color: var(--color-text-tertiary);
}
.text-center {
  text-align: center;
}
.mt-sm {
  margin-top: var(--spacing-sm);
}
.mt-md {
  margin-top: var(--spacing-md);
}
.mt-lg {
  margin-top: var(--spacing-lg);
}
.mb-lg {
  margin-bottom: var(--spacing-lg);
}
.font-bold {
  font-weight: 600;
}

/* Highlight Text */
.highlight {
  background: linear-gradient(
    120deg,
    var(--color-primary-container) 0%,
    var(--color-primary-container) 100%
  );
  background-repeat: no-repeat;
  background-size: 100% 40%;
  background-position: 0 85%;
}

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

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* Print Styles */
@media print {
  body::before,
  body::after {
    display: none;
  }

  .section-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }

  .contact-email {
    color: var(--color-primary);
    background: none;
    box-shadow: none;
  }
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) 0;
  margin-bottom: var(--spacing-sm);
}

.lang-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: var(--radius-xs);
  transition: all var(--transition-normal);
}

.lang-link:hover {
  color: var(--color-primary);
  background: var(--color-bg-secondary);
}

.lang-link.active {
  color: var(--color-primary);
  font-weight: 600;
  background: var(--color-primary-container);
}

.lang-separator {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}