/* ===================== CSS Variables & Reset ===================== */
:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --bg-card-hover: #1c2a4a;
  --bg-input: #0f1a2e;
  --text-primary: #e0e6f0;
  --text-secondary: #8899aa;
  --text-muted: #556677;
  --accent-primary: #4f8cf7;
  --accent-secondary: #6c5ce7;
  --accent-success: #00d68f;
  --accent-warning: #ffa940;
  --accent-danger: #ff4d4f;
  --border-color: #2a2a4a;
  --border-light: #1e1e3a;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: #7aa9ff;
}

/* ===================== Navbar ===================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 15, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.navbar-brand .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: white;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.navbar-links a {
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}
.navbar-links a:hover,
.navbar-links a.active {
  color: var(--text-primary);
  background: rgba(79, 140, 247, 0.1);
}
.navbar-links a.active {
  color: var(--accent-primary);
}

/* ===================== Main Layout ===================== */
.main-content {
  padding-top: 80px;
  min-height: 100vh;
}

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

/* ===================== Hero Section ===================== */
.hero {
  text-align: center;
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(79, 140, 247, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.hero p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===================== Buttons ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  box-shadow: 0 4px 16px rgba(79, 140, 247, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(79, 140, 247, 0.4);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
}

.btn-success {
  background: linear-gradient(135deg, var(--accent-success), #00b8d4);
  color: white;
}
.btn-success:hover {
  transform: translateY(-2px);
}

.btn-danger {
  background: var(--accent-danger);
  color: white;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

/* ===================== Feature Cards ===================== */
.features {
  padding: 40px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s;
}

.feature-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.feature-card .icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(79, 140, 247, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================== Config Generator ===================== */
.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.config-builder {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 900px) {
  .config-builder {
    grid-template-columns: 1fr;
  }
}

.config-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px;
}

.config-panel h3 {
  font-size: 18px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input[type="text"],
.form-group input[type="url"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.form-group textarea {
  min-height: 100px;
  font-family: var(--font-mono);
  font-size: 13px;
  resize: vertical;
}

.form-group select {
  cursor: pointer;
}

.form-group select option {
  background: var(--bg-secondary);
}

/* Checkbox Group */
.checkbox-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.checkbox-item:hover {
  border-color: var(--accent-primary);
  background: rgba(79, 140, 247, 0.05);
}

.checkbox-item.checked {
  border-color: var(--accent-primary);
  background: rgba(79, 140, 247, 0.1);
}

.checkbox-item input[type="checkbox"] {
  display: none;
}

.checkbox-item .check-mark {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-color);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
  transition: all 0.2s;
}

.checkbox-item.checked .check-mark {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

.checkbox-item .rule-count {
  font-size: 12px;
  color: var(--text-muted);
  margin-left: auto;
}

/* ===================== Config Preview ===================== */
.config-preview {
  background: #0a0a15;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
}

.config-preview pre {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-primary);
  white-space: pre;
}

.config-preview .yaml-key { color: #7aa9ff; }
.config-preview .yaml-value { color: #e0e6f0; }
.config-preview .yaml-string { color: #a8e6cf; }
.config-preview .yaml-comment { color: #556677; font-style: italic; }

/* ===================== Stats ===================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 32px 0;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}

.stat-card .stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent-primary);
}

.stat-card .stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ===================== Rule Sets ===================== */
.ruleset-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.ruleset-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.2s;
}

.ruleset-card:hover {
  border-color: var(--accent-primary);
}

.ruleset-card .header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.ruleset-card h4 {
  font-size: 16px;
}

.ruleset-card .badge {
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 20px;
  background: rgba(79, 140, 247, 0.15);
  color: var(--accent-primary);
}

.ruleset-card p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.ruleset-card .rule-preview {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-input);
  padding: 8px 12px;
  border-radius: 6px;
  overflow-x: auto;
  white-space: nowrap;
  max-height: 40px;
}

/* ===================== Docs ===================== */
.docs-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 24px;
}

.docs-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.docs-section h3 {
  font-size: 18px;
  margin-top: 24px;
  margin-bottom: 12px;
  color: var(--accent-primary);
}

.docs-section p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}

.docs-section ul, .docs-section ol {
  color: var(--text-secondary);
  padding-left: 24px;
  margin-bottom: 16px;
  line-height: 1.8;
}

.docs-section code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-input);
  padding: 2px 8px;
  border-radius: 4px;
  color: var(--accent-primary);
}

.docs-section pre {
  background: #0a0a15;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.docs-section pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

/* ===================== Tooltips & Alerts ===================== */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.alert-info {
  background: rgba(79, 140, 247, 0.1);
  border: 1px solid rgba(79, 140, 247, 0.2);
  color: var(--accent-primary);
}

.alert-success {
  background: rgba(0, 214, 143, 0.1);
  border: 1px solid rgba(0, 214, 143, 0.2);
  color: var(--accent-success);
}

.alert-warning {
  background: rgba(255, 169, 64, 0.1);
  border: 1px solid rgba(255, 169, 64, 0.2);
  color: var(--accent-warning);
}

.alert-danger {
  background: rgba(255, 77, 79, 0.1);
  border: 1px solid rgba(255, 77, 79, 0.2);
  color: var(--accent-danger);
}

/* ===================== Footer ===================== */
.footer {
  text-align: center;
  padding: 40px 24px;
  margin-top: 60px;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 14px;
}

.footer a {
  color: var(--text-secondary);
}

/* ===================== Toast ===================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 14px;
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease;
  min-width: 250px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.success { border-left: 3px solid var(--accent-success); }
.toast.error { border-left: 3px solid var(--accent-danger); }
.toast.info { border-left: 3px solid var(--accent-primary); }

@keyframes toastIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* ===================== Responsive ===================== */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 16px; }
  .navbar-links a { padding: 8px 10px; font-size: 13px; }
  .checkbox-group { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .config-panel { padding: 20px; }
}

/* ===================== Loading Spinner ===================== */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===================== Copy Button ===================== */
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

/* ===================== Tabs ===================== */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.tab {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

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

.tab.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

/* ===================== Page Header ===================== */
.page-header {
  padding: 40px 0 24px;
}

.page-header h1 {
  font-size: 32px;
  font-weight: 700;
}

.page-header p {
  color: var(--text-secondary);
  margin-top: 8px;
}

/* Subscription URL display */
.subscription-url {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-top: 12px;
}

.subscription-url code {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-primary);
  overflow-x: auto;
  white-space: nowrap;
}