:root {
  --bg-primary: #0b1120;
  --bg-secondary: #131d33;
  --bg-card: #19243d;
  --bg-input: #0e1626;
  --border-subtle: #24324f;
  --border-highlight: #3b82f6;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-emerald: #0e9790;
  --accent-emerald-dark: #0b7c76;
  --accent-emerald-subtle: rgba(14, 151, 144, 0.14);
  --accent-amber: #f59e0b;
  --accent-amber-subtle: rgba(245, 158, 11, 0.12);
  --accent-blue: #38bdf8;
  --accent-blue-subtle: rgba(56, 189, 248, 0.12);
  --accent-danger: #ef4444;
  --accent-danger-subtle: rgba(239, 68, 68, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.55;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}

/* Typography & Links */
h1, h2, h3, h4 {
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
}

p {
  color: var(--text-muted);
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: #7dd3fc;
}

code, pre {
  font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

/* Layout Utilities */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }
.gap-lg { gap: 24px; }
.gap-xl { gap: 32px; }

/* Navigation Bar */
.navbar {
  border-bottom: 1px solid var(--border-subtle);
  background-color: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-inner {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.logo-badge {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 9999px;
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  border: 1px solid rgba(14, 151, 144, 0.35);
}

.site-logo-img {
  height: 38px;
  width: auto;
  border-radius: var(--radius-sm);
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--text-main);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-emerald);
  color: #042f2e;
  border-color: var(--accent-emerald);
}

.btn-primary:hover {
  background-color: var(--accent-emerald-dark);
  border-color: var(--accent-emerald-dark);
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background-color: #233150;
  border-color: var(--border-highlight);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-outline:hover {
  background-color: var(--bg-card);
  border-color: var(--text-muted);
}

.btn-danger {
  background-color: var(--accent-danger-subtle);
  color: var(--accent-danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background-color: var(--accent-danger);
  color: #ffffff;
}

.btn-amber {
  background-color: var(--accent-amber);
  color: #451a03;
  border-color: var(--accent-amber);
}

.btn-amber:hover {
  background-color: #d97706;
  color: #ffffff;
}

.btn-sm {
  padding: 5px 11px;
  font-size: 0.82rem;
}

/* Hero Section */
.hero {
  padding: 68px 0 52px;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px;
  border-radius: 9999px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--accent-blue);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}

.hero p.lead {
  font-size: 1.15rem;
  max-width: 680px;
  margin: 0 auto 36px;
  color: var(--text-muted);
}

/* Real-Time Group Name Checker Card */
.handle-check-card {
  max-width: 640px;
  margin: 0 auto;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  text-align: left;
}

.handle-input-group {
  display: flex;
  align-items: stretch;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.handle-input-group:focus-within {
  border-color: var(--border-highlight);
}

.handle-prefix {
  padding: 12px 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  color: var(--text-dim);
  background-color: rgba(255, 255, 255, 0.02);
  border-right: 1px solid var(--border-subtle);
  user-select: none;
}

.handle-input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 12px 14px;
  color: var(--text-main);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  outline: none;
}

.handle-suffix {
  padding: 12px 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  color: var(--accent-blue);
  background-color: var(--accent-blue-subtle);
  border-left: 1px solid var(--border-subtle);
  font-weight: 600;
  user-select: none;
}

.handle-status {
  margin-top: 14px;
  font-size: 0.88rem;
  min-height: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.badge-available {
  color: var(--accent-emerald);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

.badge-taken {
  color: var(--accent-danger);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

.suggestions-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.suggestion-chip {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.suggestion-chip:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background-color: var(--accent-blue-subtle);
}

/* Sections */
.section {
  padding: 56px 0;
  border-top: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: 36px;
}

.section-tag {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-emerald);
  margin-bottom: 8px;
}

.section-title {
  font-size: 1.8rem;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

/* Group Types Comparison (2 asymmetric columns per anti-slop rules) */
.types-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.type-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color 0.2s ease;
}

.type-card:hover {
  border-color: var(--border-highlight);
}

.type-badge {
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.badge-open {
  background-color: var(--accent-blue-subtle);
  color: var(--accent-blue);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.badge-broadcast {
  background-color: var(--accent-amber-subtle);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.type-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.type-desc {
  font-size: 0.94rem;
  margin-bottom: 20px;
  flex-grow: 1;
}

.type-features {
  list-style: none;
  margin-bottom: 24px;
}

.type-features li {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.type-features li strong {
  color: var(--text-main);
}

/* Technical Architecture & Gateway Lookup */
.arch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 768px) {
  .arch-grid { grid-template-columns: 1fr; }
}

.info-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
}

.info-card h3 {
  font-size: 1.25rem;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.carrier-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-size: 0.85rem;
}

.carrier-table th, .carrier-table td {
  padding: 8px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.carrier-table th {
  color: var(--text-dim);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.72rem;
}

.carrier-table td code {
  color: var(--accent-blue);
  font-size: 0.82rem;
}

/* Interactive Simulator */
.simulator-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-lg);
}

.sim-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
}

@media (max-width: 820px) {
  .sim-grid { grid-template-columns: 1fr; }
}

.sim-col h4 {
  font-size: 1rem;
  margin-bottom: 14px;
  color: var(--text-main);
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text-main);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--border-highlight);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
  font-family: inherit;
}

.sim-output {
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  min-height: 220px;
  display: flex;
  flex-direction: column;
}

.sim-log-entries {
  flex-grow: 1;
  overflow-y: auto;
  font-size: 0.85rem;
  max-height: 260px;
}

.sim-log-entry {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  background-color: rgba(255, 255, 255, 0.03);
  border-left: 3px solid var(--accent-blue);
}

.sim-log-entry.approved { border-left-color: var(--accent-emerald); }
.sim-log-entry.pending { border-left-color: var(--accent-amber); }
.sim-log-entry.locked { border-left-color: var(--accent-danger); }

/* Modals */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

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

.modal-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 540px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(12px);
  transition: transform 0.2s ease;
}

.modal-backdrop.open .modal-card {
  transform: translateY(0);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.2rem;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease;
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 24px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-subtle);
  background-color: rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

/* Multi-Step Wizard */
.wizard-steps {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  position: relative;
}

.wizard-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  z-index: 2;
}

.step-circle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.wizard-step.active .step-circle {
  background-color: var(--accent-emerald);
  color: #042f2e;
  border-color: var(--accent-emerald);
  font-weight: 700;
}

.wizard-step.active {
  color: var(--text-main);
}

.wizard-step.completed .step-circle {
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  border-color: var(--accent-emerald);
}

/* Admin Dashboard Screen */
#dashboard-view {
  display: none;
  min-height: calc(100vh - 68px);
  padding: 32px 0 64px;
}

.dash-header {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.dash-title h2 {
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.dash-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.stat-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.stat-val {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
}

.dash-nav-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 24px;
  overflow-x: auto;
}

.dash-tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  padding: 10px 18px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.dash-tab-btn:hover {
  color: var(--text-main);
}

.dash-tab-btn.active {
  color: var(--accent-emerald);
  border-bottom-color: var(--accent-emerald);
}

.dash-tab-content {
  display: none;
}

.dash-tab-content.active {
  display: block;
}

/* Data Tables */
.table-responsive {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.data-table th, .data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
}

.data-table th {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.015);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-active {
  background-color: var(--accent-emerald-subtle);
  color: var(--accent-emerald);
  border: 1px solid rgba(14, 151, 144, 0.35);
}

.status-pending {
  background-color: var(--accent-amber-subtle);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.status-locked {
  background-color: var(--accent-danger-subtle);
  color: var(--accent-danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Pending Message Moderation Cards */
.pending-msg-card {
  background-color: var(--bg-card);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pending-msg-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

.pending-msg-body {
  font-size: 0.98rem;
  color: var(--text-main);
  background-color: var(--bg-input);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.pending-msg-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

/* Security Lockout Alert */
.alert-box {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  font-size: 0.88rem;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.alert-danger {
  background-color: var(--accent-danger-subtle);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.alert-warning {
  background-color: var(--accent-amber-subtle);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #fcd34d;
}

.alert-success {
  background-color: var(--accent-emerald-subtle);
  border: 1px solid rgba(14, 151, 144, 0.35);
  color: #a7f3d0;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  padding: 36px 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}