/* InsertDate - Common Styles */
/* Shared across index.html, legal.html, and privacy.html */

:root {
  /* Microsoft-inspired color palette */
  --primary-blue: #0078D4;
  --primary-blue-dark: #005A9E;
  --primary-blue-light: #50A0D8;
  --primary-blue-vivid: #00A4EF;
  --accent-blue: #106EBE;
  --neutral-white: #FFFFFF;
  --neutral-gray-10: #FAF9F8;
  --neutral-gray-20: #F3F2F1;
  --neutral-gray-30: #EDEBE9;
  --neutral-gray-40: #E1DFDD;
  --neutral-gray-90: #323130;
  --neutral-gray-130: #605E5C;
  --neutral-gray-160: #323130;
  --semantic-success: #107C10;
  --semantic-warning: #D83B01;
  --text-primary: #323130;
  --text-secondary: #605E5C;
  --text-muted: #8A8886;
  --border-color: #EDEBE9;
  --background-secondary: #FAF9F8;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans CJK JP", "Microsoft YaHei", "PingFang SC", "Hiragino Kaku Gothic Pro", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--neutral-white);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
nav.top-nav {
  background: var(--neutral-white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 0.3px 0.9px rgba(0, 0, 0, 0.03),
              0 1.6px 3.6px rgba(0, 0, 0, 0.04);
}

nav.top-nav .nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.logo-link {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.logo-link span {
  color: var(--primary-blue);
  font-weight: 700;
}

.lang-switcher {
  display: flex;
  gap: 8px;
}

.lang-switcher button {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background: var(--neutral-white);
  color: var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.1s ease;
}

.lang-switcher button:hover {
  background: var(--neutral-gray-20);
  border-color: var(--neutral-gray-40);
  color: var(--text-primary);
}

.lang-switcher button:focus {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

.lang-switcher button.active {
  background: var(--primary-blue);
  color: var(--neutral-white);
  border-color: var(--primary-blue);
}

/* Language-specific sections */
section[data-lang] {
  display: none;
}

section[data-lang].active {
  display: block;
}

/* Common Typography */
h1 {
  font-size: 36px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.2;
}

h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-blue);
}

h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 32px;
  margin-bottom: 16px;
}

p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

ul, ol {
  margin-left: 24px;
  margin-bottom: 20px;
}

li {
  margin-bottom: 12px;
  color: var(--text-secondary);
  line-height: 1.7;
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

.last-updated {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 40px;
}

/* Footer */
footer {
  background: var(--neutral-gray-20);
  color: var(--text-secondary);
  padding: 60px 0 32px;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 48px;
  margin-bottom: 48px;
}

.footer-section h4 {
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-section p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  list-style: none;
  margin: 0;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.1s ease;
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--primary-blue);
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--neutral-gray-30);
}

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* Before/After Comparison */
.comparison-section {
  padding: 48px 0;
  background: var(--neutral-light);
}

.comparison-section .section-header {
  text-align: center;
  margin-bottom: 32px;
}

.comparison-image {
  text-align: center;
}

.comparison-image img {
  display: block;
  margin: 0 auto;
  max-width: 480px;
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.comparison-caption {
  text-align: center;
  margin-top: 16px;
  color: var(--text-secondary);
  font-size: 14px;
}

/* Responsive - Common */
@media (max-width: 768px) {
  .lang-switcher {
    flex-wrap: wrap;
    gap: 4px;
  }

  .lang-switcher button {
    font-size: 12px;
    padding: 6px 10px;
  }

  .logo-link {
    font-size: 18px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 20px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}