:root {
  /* Dark mode (default) */
  --accent: #5865F2;
  --accent-hover: #4752C4;
  --accent-dim: rgba(88, 101, 242, 0.15);
  --warning: #f39c12;
  --danger: #e74c3c;
  
  --bg-page: #0f0f11;
  --bg-card: #1a1a1f;
  --bg-nav: rgba(15, 15, 17, 0.95);
  --bg-btn: #232329;
  --bg-btn-hover: #2d2d35;
  --bg-input: #131317;
  --bg-highlight: rgba(88, 101, 242, 0.1);
  
  --text-primary: #f0f0f2;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  
  --border: rgba(255, 255, 255, 0.07);
  --border-hover: rgba(255, 255, 255, 0.14);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-card: 0 4px 32px rgba(0, 0, 0, 0.45);
  --transition: 0.2s ease;
  --font-body:     'Sora', 'DM Sans', system-ui, sans-serif;
}

/* Light mode */
.light-mode {
  --bg-page: #f3f3f7;
  --bg-card: #ffffff;
  --bg-nav: rgba(243, 243, 247, 0.95);
  --bg-btn: #eaeaf0;
  --bg-btn-hover: #dddde8;
  --bg-input: #f8f8fa;
  --bg-highlight: rgba(88, 101, 242, 0.05);
  
  --text-primary: #111116;
  --text-secondary: #555566;
  --text-muted: #9999aa;
  
  --border: rgba(0, 0, 0, 0.07);
  --border-hover: rgba(0, 0, 0, 0.14);
  
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: var(--font-body);
  background: var(--bg-page);
  color: var(--text-primary);
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   Main Container
   ============================================================ */

.container {
  max-width: 960px;
  margin: 60px auto;
  padding: 0 24px;
  flex: 1;
  animation: fadeInUp 0.5s ease;
}

/* ============================================================
   Typography
   ============================================================ */

.container h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0 0 20px 0;
  text-align: left;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.container h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 32px 0 16px 0;
  text-align: left;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.container h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 24px 0 12px 0;
  color: var(--text-primary);
}

.container p {
  margin: 0 0 16px 0;
  line-height: 1.7;
  color: var(--text-secondary);
  font-size: 1rem;
}

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

/* Last updated text */
.container > p:first-of-type {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

/* Lists */
.container ul {
  margin: 16px 0 20px 0;
  padding-left: 24px;
  list-style: none;
}

.container li {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1rem;
  margin: 12px 0;
  position: relative;
  padding-left: 20px;
}

.container li::before {
  content: '•';
  color: var(--accent);
  font-weight: bold;
  font-size: 1.2rem;
  position: absolute;
  left: 0;
  top: -2px;
}

/* Nested lists */
.container ul ul {
  margin: 8px 0 8px 20px;
}

.container ul ul li::before {
  content: '◦';
  color: var(--text-muted);
}

/* Links */
.container a {
  color: var(--accent);
  text-decoration: none;
  transition: all var(--transition);
  border-bottom: 1px solid transparent;
}

.container a:hover {
  color: var(--accent-hover);
  border-bottom-color: var(--accent);
}

/* ============================================================
   Special Section Styling
   ============================================================ */

/* Credit system highlight */
.container p strong {
  display: inline-block;
  margin-top: 4px;
}

/* Warning sections (abuse, suspension) */
.container ul li strong {
  color: var(--warning);
}

/* Danger sections (termination) */
.container h2:has(+ p strong),
.container p strong[style*="danger"] {
  color: var(--danger);
}

/* Highlight important rules */
.container li strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* Section spacing */
.container br {
  display: none;
}

/* ============================================================
   Callout Boxes
   ============================================================ */

.callout {
  background: var(--bg-highlight);
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  margin: 20px 0;
  border-radius: var(--radius-md);
}

.callout.warning {
  border-left-color: var(--warning);
  background: rgba(243, 156, 18, 0.1);
}

.callout.danger {
  border-left-color: var(--danger);
  background: rgba(231, 76, 60, 0.1);
}

.callout p {
  margin: 0;
}

/* ============================================================
   Navigation Bar
   ============================================================ */

.header-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  background: var(--bg-nav);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-small {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.site-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  transition: color var(--transition);
  text-decoration: none;
}

.site-title:hover {
  color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Dashboard Button */
.dashboard-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-btn);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.dashboard-btn:hover {
  background: var(--bg-btn-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

/* Theme Toggle Button */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--bg-btn);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--bg-btn-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

/* Theme Icons */
.sun-icon,
.moon-icon {
  transition: opacity var(--transition);
}

/* Dark mode (default): show white sun */
.sun-icon {
  stroke: var(--text-primary);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.moon-icon {
  display: none;
  stroke: var(--text-primary);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

/* Light mode: show moon */
.light-mode .sun-icon {
  display: none;
}

.light-mode .moon-icon {
  display: block;
}

/* ============================================================
   Footer
   ============================================================ */

footer {
  text-align: center;
  padding: 32px 20px 24px;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
  margin-top: 60px;
  background: var(--bg-page);
}

footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

footer a:hover {
  color: var(--accent);
}

/* ============================================================
   Animations
   ============================================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   Scrollbar Styling
   ============================================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-input);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ============================================================
   Print Styles
   ============================================================ */

@media print {
  .header-nav,
  footer,
  .theme-toggle,
  .dashboard-btn {
    display: none;
  }

  .container {
    margin: 20px auto;
    padding: 0;
  }

  .container h1 {
    -webkit-text-fill-color: #000;
    color: #000;
  }

  .container a {
    color: #000;
    text-decoration: underline;
  }

  .container li::before {
    color: #000;
  }
}

/* ============================================================
   Responsive Design
   ============================================================ */

@media (max-width: 768px) {
  .container {
    margin: 40px auto;
    padding: 0 20px;
  }

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

  .container h2 {
    font-size: 1.3rem;
  }

  .container h3 {
    font-size: 1.1rem;
  }

  .container p,
  .container li {
    font-size: 0.95rem;
    line-height: 1.6;
  }

  .header-nav {
    padding: 0 20px;
  }

  .dashboard-btn {
    padding: 6px 14px;
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .container {
    margin: 30px auto;
    padding: 0 16px;
  }

  .container h1 {
    font-size: 1.6rem;
    margin-bottom: 16px;
  }

  .container h2 {
    font-size: 1.2rem;
    margin: 24px 0 12px 0;
  }

  .container h3 {
    font-size: 1rem;
  }

  .container p,
  .container li {
    font-size: 0.9rem;
  }

  .container ul {
    padding-left: 16px;
  }

  .container li {
    padding-left: 16px;
  }

  .header-nav {
    padding: 0 16px;
  }

  .site-title {
    font-size: 16px;
  }

  .dashboard-btn {
    padding: 5px 12px;
    font-size: 12px;
  }

  .theme-toggle {
    width: 34px;
    height: 34px;
  }

  .callout {
    padding: 12px 16px;
  }
}

/* ============================================================
   Selection Style
   ============================================================ */

::selection {
  background: var(--accent-dim);
  color: var(--accent);
}

::-moz-selection {
  background: var(--accent-dim);
  color: var(--accent);
}

/* ============================================================
   Smooth Scroll
   ============================================================ */

html {
  scroll-behavior: smooth;
}

/* ============================================================
   Back to Top Button (Optional)
   ============================================================ */

.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--bg-btn);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px;
  cursor: pointer;
  display: none;
  transition: all var(--transition);
  z-index: 1000;
}

.back-to-top:hover {
  background: var(--bg-btn-hover);
  transform: translateY(-2px);
}

.back-to-top.visible {
  display: block;
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  stroke: var(--text-secondary);
}