/* ============================================
   NETWORK CALCULATOR SUITE - PROFESSIONAL DESIGN
   ============================================ */

/* CSS Variables - Dark Theme Only */
:root {
  --primary: #8b5cf6;
  --primary-hover: #7c3aed;
  --primary-light: rgba(139, 92, 246, 0.1);
  
  --accent-teal: #06b6d4;
  --accent-violet: #a855f7;
  --accent-indigo: #6366f1;
  
  --bg-dark: #0f0f23;
  --bg-surface: #1a1a2e;
  --bg-panel: #16213e;
  --bg-elevated: #1e2749;
  --border: rgba(139, 92, 246, 0.15);
  --border-light: rgba(139, 92, 246, 0.08);
  
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.6);
  
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   BASE STYLES
   ============================================ */

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

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

body {
  line-height: 1.7;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   SCROLLBAR STYLES
   ============================================ */

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(139, 92, 246, 0.3) transparent;
}

/* Webkit browsers (Chrome, Safari, Edge) */
*::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.3);
  border-radius: 4px;
  transition: background var(--transition-fast);
}

*::-webkit-scrollbar-thumb:hover {
  background: rgba(139, 92, 246, 0.5);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  display: flex;
  height: 100vh;
  width: 100%;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 320px;
  background: linear-gradient(180deg, var(--bg-panel) 0%, var(--bg-surface) 100%);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 0;
  z-index: 100;
  transition: all var(--transition);
  position: relative;
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.4);
}

.sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 240px;
  background: radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.12), transparent 70%);
  pointer-events: none;
}

.sidebar-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 48px 32px 32px;
  border-bottom: 1px solid var(--border);
  position: relative;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.05), rgba(99, 102, 241, 0.03));
}

.brand-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--primary), var(--accent-indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-subtitle {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 8px 0 0 0;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
  padding: 32px 24px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  text-align: left;
  transition: all var(--transition);
  position: relative;
  letter-spacing: -0.01em;
}

.sidebar-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 60%;
  background: linear-gradient(180deg, var(--accent-indigo), var(--accent-teal));
  border-radius: 0 4px 4px 0;
  transition: width var(--transition);
}

.sidebar-item:hover {
  background: rgba(99, 102, 241, 0.08);
  color: var(--text-primary);
  transform: translateX(4px);
}

.sidebar-item:hover::before {
  width: 3px;
}

.sidebar-item.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.1));
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.2);
}

.sidebar-item.active::before {
  width: 3px;
}

.sidebar-item .icon {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.sidebar-item:hover .icon {
  transform: scale(1.1);
}

.sidebar-item.active .icon {
  filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

.sidebar-item .icon svg {
  width: 22px;
  height: 22px;
}

.sidebar-item .label {
  flex: 1;
}

/* Main Content Area */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-dark);
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 48px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  gap: 24px;
  z-index: 50;
  position: sticky;
  top: 0;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

/* Hide header on home page */
.top-bar.home-hidden {
  display: none;
}

/* Hide header on home page */
.top-bar.home-hidden {
  display: none;
}

.page-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-primary), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

/* Hide header actions on home page */
#home:target ~ .main .header-actions,
body:has(#home[style*="display:block"]) .header-actions {
  display: none;
}

.content-area {
  flex: 1;
  overflow-y: auto;
  padding: 40px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* Footer */
.main-footer {
  padding: 20px 40px;
  background: transparent;
  border-top: 1px solid var(--border-light);
  text-align: center;
}

.main-footer p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.main-footer a {
  color: var(--accent-indigo);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.main-footer a:hover {
  color: var(--text-primary);
}

/* Cards and Panels */
.card {
  background: linear-gradient(135deg, rgba(26, 31, 53, 0.5), rgba(30, 36, 56, 0.3));
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.3), transparent);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.2);
}

.section-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

/* Form Elements */
input, textarea, select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(26, 31, 53, 0.4);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
}

input:hover, textarea:hover, select:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent-indigo);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1), 0 4px 12px rgba(99, 102, 241, 0.15);
  background: rgba(26, 31, 53, 0.6);
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 13px;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent-indigo), var(--accent-violet));
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
  white-space: nowrap;
  min-width: fit-content;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn:hover::before {
  left: 100%;
}

.btn:active {
  transform: translateY(0);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn.secondary {
  background: rgba(99, 102, 241, 0.15);
  color: var(--text-primary);
  border: 1px solid rgba(99, 102, 241, 0.3);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2);
}

.btn.secondary:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.btn.alt {
  background: rgba(139, 92, 246, 0.15);
  color: var(--text-primary);
  border: 1px solid rgba(139, 92, 246, 0.3);
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.2);
}

.btn.alt:hover {
  background: rgba(139, 92, 246, 0.25);
  border-color: rgba(139, 92, 246, 0.5);
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.3);
}

/* Grids and Layouts */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.three {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.kpi {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
  margin-top: 24px;
}

.kpi .card {
  margin: 0;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.05));
  border: 1px solid rgba(99, 102, 241, 0.2);
  padding: 24px;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  overflow: hidden;
}

.kpi .card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.1), transparent 70%);
  border-radius: 50%;
  transform: translate(30%, -30%);
}

.kpi .card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(139, 92, 246, 0.08));
}

.kpi .card > div {
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

.kpi .card strong {
  font-weight: 600;
  color: var(--text-primary);
  display: inline-block;
  min-width: 110px;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 14px;
}

table th, table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

table th {
  font-weight: 600;
  background: var(--bg-panel);
  color: var(--text-primary);
}

table tr:hover {
  background: var(--bg-panel);
}

table tr:focus-within {
  outline: 2px solid var(--primary);
  outline-offset: -2px;
}

/* Utility Classes */
.mono {
  font-family: var(--mono);
  font-size: 13px;
}

.pill {
  display: inline-block;
  padding: 6px 12px;
  background: var(--bg-panel);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  font-size: 13px;
  border: 1px solid var(--border);
}

.error {
  color: var(--error);
  font-size: 13px;
  margin-top: 6px;
  font-weight: 500;
}

.warn {
  background: rgba(245, 158, 11, 0.1);
  border-left: 3px solid var(--warning);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  margin-bottom: 16px;
}

.sm {
  font-size: 12px;
  color: var(--text-muted);
}

.netbit {
  color: var(--primary-gold);
  font-weight: 700;
}

.hostbit {
  color: var(--primary-blue);
  font-weight: 700;
}

/* Tab Panes */
.tabpane {
  display: none;
}

/* Home Page Styles */
.home-hero {
  text-align: center;
  padding: 100px 40px 80px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.08));
  border-radius: var(--radius-lg);
  margin-bottom: 60px;
  position: relative;
  overflow: hidden;
}

.home-hero::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; transform: translateX(-50%) scale(1); }
  50% { opacity: 0.8; transform: translateX(-50%) scale(1.1); }
}

.home-logo {
  margin-bottom: 40px;
  display: flex;
  justify-content: center;
  animation: float 3s ease-in-out infinite;
  position: relative;
  z-index: 1;
}

.home-logo svg {
  filter: drop-shadow(0 8px 32px rgba(139, 92, 246, 0.5));
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}

.home-title {
  font-size: 56px;
  font-weight: 800;
  margin: 0 0 20px 0;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 50%, var(--accent-indigo) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.04em;
  position: relative;
  z-index: 1;
}

.home-subtitle {
  font-size: 24px;
  color: var(--text-secondary);
  margin: 0 0 32px 0;
  font-weight: 600;
  position: relative;
  z-index: 1;
}

.home-description {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 750px;
  margin: 0 auto 40px;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

/* Web Search Styles */
.search-container {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 10;
  pointer-events: auto;
}

.search-form {
  display: flex;
  gap: 12px;
  align-items: stretch;
  position: relative;
  z-index: 10;
}

.search-input-wrapper {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  background: rgba(30, 36, 56, 0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0 20px;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
  position: relative;
  z-index: 10;
}

.search-input-wrapper:focus-within {
  border-color: var(--primary);
  background: rgba(30, 36, 56, 0.8);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.search-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-right: 12px;
  pointer-events: none;
}

.search-input {
  flex: 1;
  min-width: 0;
  width: 100%;
  background: transparent !important;
  border: none !important;
  outline: none !important;
  padding: 16px 0;
  font-size: 16px !important;
  color: #e2e8f0 !important;
  font-family: 'Inter', sans-serif !important;
  font-weight: 400 !important;
  cursor: text !important;
  -webkit-user-select: text !important;
  user-select: text !important;
  -webkit-appearance: none !important;
  appearance: none !important;
  -webkit-text-fill-color: #e2e8f0 !important;
  opacity: 1 !important;
  line-height: 1.5 !important;
}

.search-input:focus {
  color: #ffffff !important;
  -webkit-text-fill-color: #ffffff !important;
  background: transparent !important;
  opacity: 1 !important;
}

.search-input::placeholder {
  color: var(--text-muted) !important;
  opacity: 0.6 !important;
  -webkit-text-fill-color: var(--text-muted) !important;
}

.search-engine-select {
  background: rgba(30, 36, 56, 0.9);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
  font-family: inherit;
  backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.search-engine-select:hover {
  border-color: var(--primary);
  background: rgba(30, 36, 56, 1);
}

.search-engine-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.search-btn {
  background: linear-gradient(135deg, var(--primary), var(--accent-indigo));
  color: white;
  border: none;
  padding: 16px 32px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
  flex-shrink: 0;
}

.search-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.search-btn:active {
  transform: translateY(0);
}

.home-features {
  margin-bottom: 48px;
}

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

.feature-card {
  background: linear-gradient(135deg, rgba(26, 31, 53, 0.5), rgba(30, 36, 56, 0.3));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent-indigo));
  transform: scaleX(0);
  transition: transform var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 12px 32px rgba(139, 92, 246, 0.3);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(99, 102, 241, 0.15));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: all var(--transition);
}

.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(99, 102, 241, 0.25));
  transform: scale(1.1);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.feature-card h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 12px 0;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.7;
}

.home-cta {
  text-align: center;
  padding: 48px 32px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.05));
  border-radius: var(--radius-lg);
}

.home-cta p {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 16px;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.modal-backdrop.show {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: rgba(26, 31, 53, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  overflow-x: hidden;
  box-shadow: var(--shadow-lg);
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
  transition: scrollbar-color 0.3s ease;
}

.modal:hover {
  scrollbar-color: rgba(139, 92, 246, 0.5) transparent;
}

/* Webkit scrollbar for modal */
.modal::-webkit-scrollbar {
  width: 8px;
}

.modal::-webkit-scrollbar-track {
  background: transparent;
}

.modal::-webkit-scrollbar-thumb {
  background: transparent;
  border-radius: 4px;
  transition: background 0.3s ease;
}

.modal:hover::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.5);
}

.modal:hover::-webkit-scrollbar-thumb:hover {
  background: rgba(139, 92, 246, 0.7);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 28px;
  border-bottom: 1px solid var(--border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-header h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
  text-align: center;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 24px;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 4px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.modal-close:hover {
  background: var(--bg-panel);
  color: var(--text-primary);
}

.modal-close:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.modal-body {
  padding: 28px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.modal-body h3 {
  margin-top: 20px;
  margin-bottom: 10px;
  color: var(--text-primary);
  font-size: 16px;
}

.modal-body h3:first-child {
  margin-top: 0;
}

.modal-body p {
  margin-bottom: 12px;
}

.modal-body ul, .modal-body dl {
  margin-bottom: 16px;
}

.modal-body dt {
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 8px;
}

.modal-body dd {
  margin-left: 20px;
  margin-bottom: 8px;
}

.modal-footer {
  padding: 20px 28px;
  border-top: 1px solid var(--border-light);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Settings Panel Styles */
.settings-panel,
.about-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.setting-group label {
  font-weight: 700;
  font-size: 16px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.setting-description {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 8px 0;
  line-height: 1.5;
}

/* Theme Options */
.theme-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.theme-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px 16px;
  border: 2px solid var(--border-light);
  border-radius: var(--radius);
  background: var(--bg-panel);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-fast);
  text-align: center;
  gap: 8px;
}

.theme-btn:hover {
  border-color: var(--primary-blue);
  background: rgba(74, 158, 255, 0.1);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.theme-btn.active {
  border-color: var(--primary-gold);
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.15), rgba(74, 158, 255, 0.15));
  box-shadow: 0 0 16px rgba(212, 175, 55, 0.3);
}

.theme-icon {
  font-size: 32px;
  line-height: 1;
}

.theme-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.theme-desc {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
}

.coming-soon-badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(74, 158, 255, 0.15);
  color: var(--primary-blue);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.setting-group button {
  padding: 10px 16px;
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: var(--radius-sm);
  background: rgba(212, 175, 55, 0.1);
  color: var(--primary-gold);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition-fast);
}

.setting-group button:hover {
  background: rgba(212, 175, 55, 0.2);
  border-color: var(--primary-gold);
}

/* About Panel */
.about-logo {
  text-align: center;
  margin: 10px 0;
}

.about-logo img {
  width: 80px;
  height: 80px;
}

.about-panel h3 {
  text-align: center;
  margin: 10px 0;
  color: var(--text-primary);
}

.about-panel .version {
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
}

.about-panel .description {
  color: var(--text-secondary);
  line-height: 1.6;
}

.about-features {
  background: rgba(74, 158, 255, 0.1);
  padding: 15px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary-blue);
}

.about-features h4 {
  margin-top: 0;
  color: var(--primary-blue);
}

.about-features ul {
  margin: 8px 0;
  padding-left: 20px;
  list-style: none;
}

.about-features li {
  color: var(--text-secondary);
  margin: 4px 0;
}

.about-features li::before {
  content: "✓ ";
  color: var(--primary-gold);
  margin-right: 8px;
}

.about-developer {
  background: rgba(212, 175, 55, 0.1);
  padding: 15px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary-gold);
  margin-top: 10px;
}

.about-developer h4 {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--primary-gold);
}

.about-developer p {
  margin: 4px 0;
  color: var(--text-secondary);
}

.about-developer strong {
  color: var(--text-primary);
  font-size: 15px;
}

.dev-desc {
  font-size: 13px;
  font-style: italic;
}

.about-panel .copyright {
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .sidebar {
    width: 240px;
  }
  
  .content-area {
    padding: 24px;
  }
  
  .top-bar {
    padding: 24px 32px;
  }
  
  .page-title {
    font-size: 28px;
  }
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    height: auto;
    flex-direction: row;
    padding: 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  
  .sidebar-header {
    padding: 16px 24px;
    border-bottom: none;
    border-right: 1px solid var(--border);
  }
  
  .brand-title {
    font-size: 20px;
  }
  
  .brand-subtitle {
    display: none;
  }
  
  .sidebar-nav {
    flex-direction: row;
    padding: 16px 24px;
    gap: 8px;
    overflow-x: auto;
    overflow-y: hidden;
  }
  
  .sidebar-item {
    flex-direction: column;
    padding: 12px 16px;
    min-width: 80px;
  }
  
  .sidebar-item .icon {
    margin-right: 0;
    margin-bottom: 4px;
  }
  
  .sidebar-item .label {
    font-size: 11px;
  }
  
  .top-bar {
    padding: 20px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  
  .page-title {
    font-size: 24px;
  }
  
  .header-actions {
    width: 100%;
    justify-content: flex-start;
  }
  
  .content-area {
    padding: 20px;
  }
  
  .home-hero {
    padding: 60px 24px 50px;
  }
  
  .home-logo svg {
    width: 100px;
    height: 100px;
  }
  
  .home-title {
    font-size: 36px;
  }
  
  .home-subtitle {
    font-size: 18px;
  }
  
  .home-description {
    font-size: 15px;
  }
  
  .search-form {
    flex-direction: column;
    gap: 10px;
  }
  
  .search-input-wrapper {
    width: 100%;
  }
  
  .search-engine-select {
    width: 100%;
  }
  
  .search-btn {
    width: 100%;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .three {
    grid-template-columns: 1fr;
  }
  
  .kpi {
    grid-template-columns: 1fr;
  }
  
  .modal {
    width: 95%;
    margin: 20px;
  }
  
  table {
    font-size: 12px;
  }
  
  table th, table td {
    padding: 8px;
  }
}

@media (max-width: 480px) {
  .sidebar-header {
    padding: 12px 16px;
  }
  
  .brand-title {
    font-size: 16px;
  }
  
  .sidebar-nav {
    padding: 12px 16px;
    gap: 6px;
  }
  
  .sidebar-item {
    padding: 10px 12px;
    min-width: 70px;
  }
  
  .sidebar-item .icon svg {
    width: 18px;
    height: 18px;
  }
  
  .sidebar-item .label {
    font-size: 10px;
  }
  
  .top-bar {
    padding: 16px 20px;
  }
  
  .page-title {
    font-size: 20px;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 13px;
  }
  
  .content-area {
    padding: 16px;
  }
  
  .card {
    padding: 20px;
  }
  
  .home-hero {
    padding: 50px 20px 40px;
  }
  
  .home-logo {
    margin-bottom: 32px;
  }
  
  .home-logo svg {
    width: 90px;
    height: 90px;
  }
  
  .home-title {
    font-size: 28px;
  }
  
  .home-subtitle {
    font-size: 16px;
  }
  
  .home-description {
    font-size: 14px;
  }
  
  .search-container {
    max-width: 100%;
  }
  
  .search-input {
    font-size: 14px;
  }
  
  .search-btn {
    padding: 14px 24px;
    font-size: 14px;
  }
  
  .feature-card {
    padding: 24px 20px;
  }
  
  .home-cta {
    padding: 32px 20px;
  }
  
  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .cta-buttons .btn {
    width: 100%;
  }
  
  .modal {
    width: 100%;
    max-height: 90vh;
    margin: 0;
    border-radius: 0;
  }
  
  .modal-header {
    padding: 16px 20px;
  }
  
  .modal-header h2 {
    font-size: 18px;
  }
  
  .modal-body {
    padding: 20px;
  }
  
  table {
    font-size: 11px;
    display: block;
    overflow-x: auto;
  }
  
  input, select, textarea {
    font-size: 14px;
  }
}

/* Logo sizing: keep logo small inside sidebar */