:root {
  --bg-black: #05070c;
  --bg-navy: #0b1120;
  --glass-bg: rgba(15, 23, 42, 0.65);
  --glass-border: rgba(56, 189, 248, 0.18);
  --glass-highlight: rgba(255, 255, 255, 0.05);
  --cyan: #06b6d4;
  --cyan-bright: #22d3ee;
  --purple: #8b5cf6;
  --purple-bright: #a855f7;
  --gradient-accent: linear-gradient(135deg, var(--cyan), var(--purple));
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  --success: #10b981;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius-lg: 16px;
  --radius-md: 10px;
}

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

body {
  background-color: var(--bg-black);
  background-image: radial-gradient(circle at 50% 0%, var(--bg-navy) 0%, var(--bg-black) 75%);
  color: var(--text-primary);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.5;
}

/* Ambient Background Glows */
.bg-glow {
  position: fixed;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  filter: blur(130px);
  opacity: 0.18;
  pointer-events: none;
  z-index: -1;
}

.bg-glow-1 {
  top: -120px;
  left: -100px;
  background: var(--cyan);
}

.bg-glow-2 {
  bottom: -150px;
  right: -100px;
  background: var(--purple);
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navbar */
.navbar {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(5, 7, 12, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 40;
}

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

.brand {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  padding: 4px 10px;
  border: 1px solid rgba(34, 211, 238, 0.35);
  border-radius: 8px;
}

.brand-sub {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  color: var(--text-primary);
}

.status-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.status-pill.online .status-dot {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.status-pill.error .status-dot {
  background: var(--danger);
  box-shadow: 0 0 8px var(--danger);
}

/* Main & Hero */
.main-content {
  flex: 1;
  padding-top: 36px;
  padding-bottom: 48px;
}

.hero-section {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 32px;
}

.tagline {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--cyan-bright);
  margin-bottom: 10px;
  font-weight: 700;
}

.hero-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
}

/* Alert Banner */
.alert-banner {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.45);
  color: #fca5a5;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  font-size: 0.9rem;
}

/* Glass Cards */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6), inset 0 1px 0 0 var(--glass-highlight);
}

/* Generator Card */
.generator-card {
  max-width: 780px;
  margin: 0 auto 32px;
  padding: 24px;
}

.generator-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.label-badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.timer-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--cyan-bright);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  padding: 4px 12px;
  border-radius: 999px;
  font-family: var(--font-mono);
}

.timer-badge.expiring {
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.4);
  background: rgba(251, 191, 36, 0.1);
}

.address-box {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}

.address-box input {
  flex: 1;
  background: rgba(5, 7, 12, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 1rem;
  outline: none;
  min-width: 0;
}

.address-box input:focus {
  border-color: var(--cyan);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: transform 0.15s ease, opacity 0.2s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}

.btn:active:not(:disabled) {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 6px 24px rgba(139, 92, 246, 0.45);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.11);
}

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

.btn-danger:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.25);
}

.btn-sm {
  padding: 7px 12px;
  font-size: 0.82rem;
}

.action-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

/* Workspace Grid */
.workspace-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 20px;
  min-height: 480px;
}

.inbox-list-card,
.message-viewer-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.card-header {
  padding: 18px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h2 {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.count-pill {
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  font-family: var(--font-mono);
}

.auto-sync-text {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Message List */
.message-list {
  flex: 1;
  overflow-y: auto;
  max-height: 540px;
}

.message-item {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  cursor: pointer;
  transition: background 0.15s ease;
}

.message-item:hover {
  background: rgba(255, 255, 255, 0.04);
}

.message-item.active {
  background: rgba(6, 182, 212, 0.12);
  border-left: 3px solid var(--cyan-bright);
}

.msg-item-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}

.msg-sender {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.msg-time {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.msg-item-subject {
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--cyan-bright);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.msg-item-preview {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Empty State & Radar */
.empty-state {
  padding: 56px 24px;
  text-align: center;
  color: var(--text-secondary);
}

.empty-state h3 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.empty-state p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.radar-spinner {
  width: 44px;
  height: 44px;
  margin: 0 auto 18px;
  border-radius: 50%;
  border: 2px solid rgba(34, 211, 238, 0.2);
  border-top-color: var(--cyan-bright);
  border-right-color: var(--purple-bright);
  animation: spin 1.2s linear infinite;
}

.spin {
  animation: spin 0.8s linear infinite;
}

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

/* Viewer */
.viewer-placeholder {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-muted);
  padding: 40px;
}

.viewer-content {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.viewer-topbar {
  padding: 14px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.viewer-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.view-toggle {
  display: flex;
  background: rgba(5, 7, 12, 0.7);
  border-radius: 8px;
  padding: 3px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.toggle-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 5px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
}

.toggle-btn.active {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
}

.message-meta {
  padding: 18px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.msg-subject {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.message-body-wrapper {
  flex: 1;
  min-height: 360px;
  display: flex;
  flex-direction: column;
}

#msg-html-frame {
  width: 100%;
  flex: 1;
  min-height: 380px;
  border: none;
  background: #ffffff;
}

.msg-text-body {
  padding: 20px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-primary);
  overflow-y: auto;
}

/* Footer */
.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-link:hover {
  color: var(--cyan-bright);
}

/* Toasts */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 99;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  animation: slideUp 0.25s ease;
}

.toast.error {
  border-color: rgba(239, 68, 68, 0.5);
  color: #fca5a5;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hidden {
  display: none !important;
}

.mobile-only {
  display: none;
}

/* Responsive Mobile Layout */
@media (max-width: 860px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }

  .mobile-only {
    display: inline-flex;
  }

  .workspace-grid.viewing-message .inbox-list-card {
    display: none;
  }

  .workspace-grid:not(.viewing-message) .message-viewer-card {
    display: none;
  }
}

@media (max-width: 560px) {
  .address-box {
    flex-direction: column;
  }

  .action-bar {
    grid-template-columns: 1fr;
  }
}