/* =========================================================
   CHRONOS.GLOBAL - ESTILOS FINTECH & DARK MODE PREMIUM
   ========================================================= */

:root {
  /* Paleta de Colores Primarios (Dark Charcoal / Obsidian Noir) */
  --bg-primary: #090a0d;
  --bg-secondary: #121318;
  --bg-card: rgba(20, 22, 28, 0.78);
  --bg-card-hover: rgba(30, 33, 42, 0.88);
  --border-color: rgba(255, 255, 255, 0.09);
  --border-glow: rgba(56, 189, 248, 0.25);

  /* Acentos y Estados */
  --accent-cyan: #38bdf8;
  --accent-blue: #3b82f6;
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.35);
  --accent-red: #ef4444;
  --accent-red-glow: rgba(239, 68, 68, 0.35);
  --accent-amber: #f59e0b;
  --accent-amber-glow: rgba(245, 158, 11, 0.35);

  /* Texto */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Tipografías */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transiciones y Sombras */
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.65), 0 8px 10px -6px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.12);
}

/* =========================================================
   TEMA CLARO (LIGHT MODE)
   ========================================================= */
[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-glow: rgba(2, 132, 199, 0.25);

  --accent-cyan: #0284c7;
  --accent-blue: #2563eb;
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.25);
  --accent-red: #dc2626;
  --accent-red-glow: rgba(220, 38, 38, 0.25);
  --accent-amber: #d97706;
  --accent-amber-glow: rgba(217, 119, 6, 0.25);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.12);
}

[data-theme="light"] body {
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 100% 50%, rgba(5, 150, 105, 0.05) 0%, transparent 40%);
}

[data-theme="light"] .brand-name {
  color: #0f172a;
}

[data-theme="light"] .section-header h2 {
  color: #0f172a;
}

[data-theme="light"] .logo-icon-box {
  background: rgba(2, 132, 199, 0.1);
  border-color: rgba(2, 132, 199, 0.3);
  color: #0284c7;
  box-shadow: 0 0 15px rgba(2, 132, 199, 0.15);
}

[data-theme="light"] .atomic-clock,
[data-theme="light"] .city-time-display {
  color: #0f172a;
}

[data-theme="light"] .app-header {
  background: rgba(241, 245, 249, 0.88);
}

[data-theme="light"] .lang-dropdown {
  background: #ffffff;
  border: 1px solid rgba(2, 132, 199, 0.25);
  box-shadow: 0 15px 35px -5px rgba(15, 23, 42, 0.15);
}

[data-theme="light"] .lang-item {
  color: #0f172a;
}

[data-theme="light"] .lang-item:hover {
  background: rgba(2, 132, 199, 0.1);
  color: #0284c7;
}

[data-theme="light"] .timeline-row {
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .timeline-hours-header {
  color: #64748b;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .timeline-cell {
  background: rgba(0, 0, 0, 0.025);
  border-right: 1px solid rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .styled-select {
  background: rgba(0, 0, 0, 0.04);
  color: #0f172a;
}

[data-theme="light"] .styled-select option {
  background: #ffffff;
  color: #0f172a;
}

[data-theme="light"] .sync-status {
  background: rgba(0, 0, 0, 0.04);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.035) 0%, transparent 60%),
    radial-gradient(circle at 100% 50%, rgba(56, 189, 248, 0.02) 0%, transparent 45%);
  background-attachment: fixed;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Paneles Glassmorphism */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  box-shadow: var(--shadow-lg);
}

/* Header */
.app-header {
  border-bottom: 1px solid var(--border-color);
  background: rgba(9, 10, 13, 0.88);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.85rem 0;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon-box {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.18), rgba(59, 130, 246, 0.08));
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 10px;
  color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.18);
  transition: var(--transition);
}

.logo:hover .logo-icon-box {
  border-color: var(--accent-cyan);
  transform: scale(1.04);
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: #ffffff;
}

.brand-accent {
  color: var(--accent-cyan);
}

.brand-tagline {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Estado de Sincronización */
.sync-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.4rem 0.8rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
}

.sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
}

.sync-dot.pulsing {
  box-shadow: 0 0 0 rgba(16, 185, 129, 0.6);
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.btn-resync {
  background: none;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition);
  padding: 3px;
  border-radius: 50%;
}

.btn-resync:hover {
  color: var(--accent-cyan);
  transform: rotate(180deg);
}

.geo-svg, .pulse-svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.info-svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.badge-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-right: 0.25rem;
}

.status-dot-active {
  background: var(--accent-emerald);
  box-shadow: 0 0 6px var(--accent-emerald);
}

.status-dot-inactive {
  background: var(--text-muted);
}

/* Botón secundario con icono */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* Contenido Principal */
.main-content {
  flex: 1;
  padding-top: 2rem;
  padding-bottom: 3rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* =========================================================
   1. HERO CLOCK (RELOJ ATÓMICO)
   ========================================================= */
.hero-clock-section {
  text-align: center;
}

.clock-card {
  padding: 2.5rem 1.5rem;
  border: 1px solid var(--border-glow);
  box-shadow: var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.clock-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
}

.location-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.timezone-badge {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
}

.atomic-clock {
  font-family: var(--font-mono);
  font-size: 4.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #ffffff;
  display: flex;
  justify-content: center;
  align-items: baseline;
  text-shadow: 0 0 30px rgba(56, 189, 248, 0.2);
  margin: 0.5rem 0;
}

.time-seconds {
  font-size: 2.5rem;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-left: 0.2rem;
}

.time-ampm {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-left: 0.75rem;
  font-weight: 600;
}

.clock-details {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}

.date-display {
  font-size: 1.15rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.offset-indicator {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.3rem 0.8rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
}

.offset-indicator strong {
  color: var(--accent-emerald);
}

/* =========================================================
   2. SECCIÓN MERCADOS FINANCIEROS
   ========================================================= */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.2rem;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #ef4444;
  animation: pulseRed 1.5s infinite;
}

@keyframes pulseRed {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
  100% { opacity: 1; transform: scale(1); }
}

.markets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.market-card {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.market-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.market-card.open {
  border-left: 4px solid var(--accent-emerald);
}

.market-card.closed {
  border-left: 4px solid var(--accent-red);
}

.market-card.premarket {
  border-left: 4px solid var(--accent-amber);
}

.market-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.market-title-group {
  display: flex;
  flex-direction: column;
}

.market-flag-name {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.market-exchange {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Badges de Estado */
.status-badge {
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-badge.open {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  box-shadow: 0 0 10px var(--accent-emerald-glow);
}

.status-badge.closed {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.status-badge.premarket {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
  box-shadow: 0 0 10px var(--accent-amber-glow);
}

.market-mid {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.market-local-time {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: #ffffff;
}

.market-schedule {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.market-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
}

.countdown-label {
  color: var(--text-muted);
}

.countdown-value {
  font-family: var(--font-mono);
  font-weight: 600;
}

.countdown-value.text-open {
  color: var(--accent-emerald);
}

.countdown-value.text-closed {
  color: var(--accent-red);
}

/* =========================================================
   TIMELINE OVERLAP (MAPA DE SOLAPAMIENTO)
   ========================================================= */
.market-timeline-card {
  padding: 1.5rem;
}

.timeline-header {
  margin-bottom: 1.25rem;
}

.timeline-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.tooltip-info {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.timeline-container {
  position: relative;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.timeline-hours-header {
  display: grid;
  grid-template-columns: 140px repeat(24, 1fr);
  gap: 2px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 0.5rem;
  min-width: 700px;
}

.timeline-rows {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 700px;
}

.timeline-row {
  display: grid;
  grid-template-columns: 140px repeat(24, 1fr);
  gap: 2px;
  align-items: center;
}

.timeline-market-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.timeline-cell {
  height: 22px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.03);
}

.timeline-cell.active-session {
  background: var(--accent-blue);
  opacity: 0.85;
}

.timeline-cell.overlap-session {
  background: var(--accent-emerald);
  box-shadow: 0 0 6px var(--accent-emerald-glow);
}

.timeline-now-indicator {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.9);
  pointer-events: none;
  z-index: 10;
  transition: left 0.5s ease-out;
}

.now-label {
  position: absolute;
  top: -8px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-cyan);
  color: #0a0e17;
  font-size: 0.6rem;
  font-weight: 800;
  padding: 1px 4px;
  border-radius: 3px;
  letter-spacing: 0.05em;
}

/* =========================================================
   3. COMPARADOR DE ZONAS HORARIAS
   ========================================================= */
.converter-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.btn {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.styled-select {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  cursor: pointer;
  outline: none;
}

.styled-select:focus {
  border-color: var(--accent-cyan);
}

/* Slider de 24 horas */
.slider-control-card {
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.slider-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.slider-time-badge {
  font-family: var(--font-mono);
  background: var(--accent-cyan);
  color: #0a0e17;
  font-weight: 700;
  padding: 0.2rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.85rem;
}

.time-range-slider {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.1);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.time-range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.8);
  cursor: grab;
  border: 2px solid #ffffff;
}

.time-range-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.8);
  cursor: grab;
  border: 2px solid #ffffff;
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 0.5rem;
}

/* Lista de Ciudades Comparadas */
.cities-compare-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.city-compare-card {
  padding: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}

.city-compare-card:hover {
  background: var(--bg-card-hover);
}

.city-info-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.city-flag {
  font-size: 2rem;
}

.city-name-box h4 {
  font-size: 1.1rem;
  font-weight: 700;
}

.city-diff-badge {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.city-status-group {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.work-window-badge {
  font-size: 0.75rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.work-window-badge.work-hours {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.work-window-badge.off-hours {
  background: rgba(107, 114, 128, 0.15);
  color: var(--text-muted);
  border: 1px solid rgba(107, 114, 128, 0.3);
}

.city-time-display {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: #ffffff;
  min-width: 110px;
  text-align: right;
}

.btn-remove-city {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.25rem;
  transition: var(--transition);
}

.btn-remove-city:hover {
  color: var(--accent-red);
}

/* =========================================================
   4. SEO & FAQ
   ========================================================= */
.seo-info-section {
  padding: 2rem;
}

.seo-info-section h2 {
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.faq-card h3 {
  font-size: 1rem;
  color: var(--accent-cyan);
  margin-bottom: 0.5rem;
}

.faq-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-subtext {
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

/* Header Controls (Language Selector + Sync Badge) */
.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Selector de Idiomas Dropdown */
.lang-selector-container {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.75rem;
  border-radius: 9999px;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  transition: var(--transition);
  font-family: inherit;
}

.lang-btn:hover, .lang-btn:focus-visible {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--accent-cyan);
  outline: none;
}

/* Botón Alternador de Tema (Dark / Light / System) */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.75rem;
  border-radius: 9999px;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  transition: var(--transition);
  font-family: inherit;
  user-select: none;
}

.theme-toggle-btn:hover, .theme-toggle-btn:focus-visible {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--accent-cyan);
  outline: none;
  transform: translateY(-1px);
}

.theme-icon {
  font-size: 0.95rem;
  line-height: 1;
}

.theme-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.lang-flag {
  font-size: 1.05rem;
  line-height: 1;
}

.lang-code {
  letter-spacing: 0.05em;
}

.lang-caret {
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.lang-selector-container.open .lang-caret {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  width: 230px;
  max-height: 340px;
  overflow-y: auto;
  background: #111217;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 0.75rem;
  box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.9), 0 0 15px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  padding: 0.35rem;
  display: none;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.25) transparent;
}

.lang-dropdown::-webkit-scrollbar {
  width: 6px;
}
.lang-dropdown::-webkit-scrollbar-thumb {
  background: rgba(56, 189, 248, 0.3);
  border-radius: 4px;
}

.lang-selector-container.open .lang-dropdown {
  display: block;
  animation: dropdownFade 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes dropdownFade {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.lang-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  width: 100%;
  padding: 0.5rem 0.7rem;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.84rem;
  border-radius: 0.45rem;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s ease, color 0.15s ease;
  font-family: inherit;
}

.lang-item:hover, .lang-item:focus-visible {
  background: rgba(56, 189, 248, 0.15);
  color: #ffffff;
  outline: none;
}

.lang-item.active {
  background: rgba(56, 189, 248, 0.22);
  color: var(--accent-cyan);
  font-weight: 600;
}

.lang-item-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lang-item-code {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* Soporte RTL (Árabe, Hebreo) */
html[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

html[dir="rtl"] .lang-dropdown {
  right: auto;
  left: 0;
}

html[dir="rtl"] .lang-item {
  text-align: right;
}

html[dir="rtl"] .city-time-display {
  text-align: left;
}

/* Responsividad */
@media (max-width: 768px) {
  .atomic-clock {
    font-size: 3.2rem;
  }
  .time-seconds {
    font-size: 1.8rem;
  }
  .city-compare-card {
    flex-direction: column;
    align-items: flex-start;
  }
  .city-status-group {
    width: 100%;
    justify-content: space-between;
  }
  .header-container {
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
  }
  .header-controls {
    width: 100%;
    justify-content: space-between;
  }
}

/* =========================================================
   13. MODO PANTALLA COMPLETA (DESK DISPLAY MODE)
   ========================================================= */
.fullscreen-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--bg-primary);
  z-index: 999999;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  padding: 3rem 2rem;
  user-select: none;
}

.fullscreen-overlay.active {
  display: flex;
  animation: fadeIn 0.25s ease-out;
}

.fullscreen-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1400px;
}

.btn-close-fullscreen {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-close-fullscreen:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: var(--accent-red);
  color: #fca5a5;
}

.fullscreen-clock-card {
  text-align: center;
  margin: auto 0;
}

.fullscreen-time {
  font-family: var(--font-mono);
  font-size: clamp(4.5rem, 15vw, 12rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: #ffffff;
  line-height: 0.95;
  text-shadow: 0 0 50px rgba(56, 189, 248, 0.25);
}

.fullscreen-time .seconds {
  font-size: 0.5em;
  color: var(--accent-cyan);
}

.fullscreen-date {
  font-size: clamp(1.2rem, 3vw, 2.2rem);
  color: var(--text-secondary);
  margin-top: 1.5rem;
  font-weight: 500;
}

.fullscreen-markets-bar {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
  max-width: 1200px;
}

.fullscreen-market-chip {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  padding: 0.45rem 1.25rem;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* =========================================================
   14. ATAJOS DE TECLADO (<kbd>)
   ========================================================= */
kbd {
  display: inline-block;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.4);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  min-width: 24px;
  text-align: center;
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.85rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.shortcut-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* =========================================================
   15. CALCULADORA DE VUELOS & JET LAG
   ========================================================= */
.flight-calc-card {
  padding: 2rem;
  margin-top: 1rem;
}

.flight-form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.flight-input-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.flight-input {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  color: #ffffff;
  padding: 0.65rem 0.9rem;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.flight-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
}

.flight-result-box {
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 12px;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}

.flight-result-item .label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.flight-result-item .val {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-top: 0.2rem;
}

.flight-result-item .sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Light Theme Overrides */
[data-theme="light"] .fullscreen-overlay {
  background: #f1f5f9;
}
[data-theme="light"] .fullscreen-time {
  color: #0f172a;
  text-shadow: 0 0 40px rgba(2, 132, 199, 0.15);
}
[data-theme="light"] .fullscreen-date {
  color: #475569;
}
[data-theme="light"] .fullscreen-market-chip {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
  color: #0f172a;
}
[data-theme="light"] kbd {
  background: rgba(0, 0, 0, 0.06);
  border-color: rgba(0, 0, 0, 0.15);
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.15);
  color: #0284c7;
}
[data-theme="light"] .shortcut-row {
  background: rgba(0, 0, 0, 0.02);
  border-color: rgba(0, 0, 0, 0.06);
}
[data-theme="light"] .flight-input {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.15);
  color: #0f172a;
}