:root {
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --card-hover-border: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-blue: #2563eb;
  --accent-indigo: #4f46e5;
  --accent-emerald: #059669;
  --accent-teal: #0d9488;
  --accent-purple: #7c3aed;
  --accent-pink: #db2777;
  --accent-gold: #d97706;
  --accent-amber: #b45309;
  --header-bg: rgba(248, 250, 252, 0.8);
  --footer-bg: #f1f5f9;
  --divider: #e2e8f0;
  --lang-switch-bg: #e2e8f0;
  --lang-switch-border: #cbd5e1;
  --lang-btn-active-bg: #ffffff;
  --hover-glow: rgba(0, 0, 0, 0.02);
  --logo-gradient: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  --glow-opacity: 0.04;
  --title-gradient: linear-gradient(135deg, #0f172a 40%, #475569 100%);
  --code-bg: #f1f5f9;
  --code-color: #1e293b;
  --code-border: #cbd5e1;
  --inline-code-bg: rgba(0, 0, 0, 0.05);
  --inline-code-color: #e11d48;
}

[data-theme="dark"] {
  --bg-color: #0d0e12;
  --card-bg: #15161e;
  --card-border: rgba(255, 255, 255, 0.06);
  --card-hover-border: rgba(255, 255, 255, 0.15);
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-emerald: #10b981;
  --accent-teal: #14b8a6;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-gold: #f59e0b;
  --accent-amber: #d97706;
  --header-bg: rgba(13, 14, 18, 0.8);
  --footer-bg: #0d0e12;
  --divider: rgba(255, 255, 255, 0.08);
  --lang-switch-bg: #1b1c24;
  --lang-switch-border: rgba(255, 255, 255, 0.08);
  --lang-btn-active-bg: #272832;
  --hover-glow: rgba(255, 255, 255, 0.02);
  --logo-gradient: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
  --glow-opacity: 0;
  --title-gradient: linear-gradient(135deg, #ffffff 40%, #94a3b8 100%);
  --code-bg: #1b1c24;
  --code-color: #e2e8f0;
  --code-border: rgba(255, 255, 255, 0.08);
  --inline-code-bg: rgba(255, 255, 255, 0.06);
  --inline-code-color: #fb7185;
}

/* Category Accents Mappings */
.category-truetime {
  --theme-accent-primary: var(--accent-blue);
  --theme-accent-secondary: var(--accent-indigo);
}
.category-hereweather {
  --theme-accent-primary: var(--accent-emerald);
  --theme-accent-secondary: var(--accent-teal);
}
.category-anytools {
  --theme-accent-primary: var(--accent-purple);
  --theme-accent-secondary: var(--accent-pink);
}
.category-moodcast {
  --theme-accent-primary: #ec4899;
  --theme-accent-secondary: #f59e0b;
}
.category-moneyfit {
  --theme-accent-primary: var(--accent-gold);
  --theme-accent-secondary: var(--accent-amber);
}
.category-privacy {
  --theme-accent-primary: var(--accent-blue);
  --theme-accent-secondary: var(--accent-indigo);
}
.category-terms {
  --theme-accent-primary: var(--accent-indigo);
  --theme-accent-secondary: var(--accent-blue);
}

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

body {
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
}

/* Background Glow Animations */
.bg-glow-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.bg-glow-1 {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, var(--glow-opacity, 0.15)) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
  filter: blur(80px);
}

.bg-glow-2 {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(99, 102, 241, var(--glow-opacity, 0.15)) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
  filter: blur(80px);
}

.bg-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at top right, rgba(99, 102, 241, var(--glow-opacity, 0.15)) 0%, transparent 60%);
  z-index: 0;
  pointer-events: none;
  filter: blur(80px);
}

header {
  position: relative;
  z-index: 10;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--divider);
}

.header-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--logo-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span {
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header Controls & Theme Toggle */
.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.theme-toggle-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-primary);
  border-color: var(--accent-blue, var(--accent-emerald, var(--accent-purple, var(--accent-pink, var(--accent-gold)))));
}

[data-theme="dark"] .theme-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.05);
}

.theme-toggle-btn .sun-icon {
  display: none;
}
.theme-toggle-btn .moon-icon {
  display: block;
}
[data-theme="dark"] .theme-toggle-btn .sun-icon {
  display: block;
}
[data-theme="dark"] .theme-toggle-btn .moon-icon {
  display: none;
}

/* Language Toggle */
.lang-switch {
  display: flex;
  background: var(--lang-switch-bg);
  border: 1px solid var(--lang-switch-border);
  border-radius: 9999px;
  padding: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.3s ease;
}

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

.lang-btn.active {
  background: var(--lang-btn-active-bg);
  color: var(--text-primary);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* Document / Blog Article Styles */
.container {
  flex: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 2rem;
  position: relative;
  z-index: 5;
}

.back-link {
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 2rem;
  transition: color 0.3s ease;
}

.back-link:hover {
  color: var(--theme-accent-primary, var(--accent-blue));
}

.back-link svg {
  margin-right: 0.5rem;
}

article, .doc-wrapper {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 2.5rem;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.article-meta, .doc-meta {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

h1 {
  font-family: 'Outfit', 'Noto Sans KR', sans-serif;
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 2rem;
  background: var(--title-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-family: 'Outfit', 'Noto Sans KR', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--theme-accent-primary, var(--accent-blue));
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--divider);
  padding-bottom: 0.5rem;
}

h3 {
  font-family: 'Outfit', 'Noto Sans KR', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

p {
  font-size: 0.975rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  font-weight: 300;
  word-break: keep-all;
}

ul, ol {
  margin-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

li {
  font-size: 0.975rem;
  line-height: 1.7;
  margin-bottom: 0.5rem;
  font-weight: 300;
}

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

code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  background: var(--inline-code-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  color: var(--inline-code-color);
  font-size: 0.9rem;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 1.5rem;
  border-radius: 12px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

pre code {
  background: transparent;
  padding: 0;
  color: var(--code-color);
  font-size: 0.9rem;
}

.cta-container {
  text-align: center;
  margin-top: 3rem;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  background: linear-gradient(135deg, var(--theme-accent-primary, var(--accent-blue)) 0%, var(--theme-accent-secondary, var(--accent-indigo)) 100%);
  color: #ffffff;
  padding: 1rem 2rem;
  border-radius: 9999px;
  text-decoration: none;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.cta-btn svg {
  margin-left: 0.5rem;
}

/* Footer Section */
footer {
  margin-top: auto;
  background-color: var(--footer-bg);
  border-top: 1px solid var(--divider);
  padding: 2rem 2rem;
  position: relative;
  z-index: 10;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.footer-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

@media (min-width: 640px) {
  .footer-container {
    flex-direction: row;
    justify-content: space-between;
  }
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 300;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--accent-blue, var(--accent-emerald, var(--accent-purple, var(--accent-pink, var(--accent-gold)))));
}

/* Language Sections Toggle */
.lang-section {
  display: none;
}
.lang-section.active {
  display: block;
}