/* Modern Metro Dark & Light Glassmorphism CSS */
:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #131b2e;
  --bg-card: rgba(23, 32, 54, 0.75);
  --bg-card-hover: rgba(30, 42, 70, 0.88);
  --bg-column: rgba(15, 22, 38, 0.5);
  --bg-train-card: rgba(26, 36, 60, 0.7);
  --bg-train-card-hover: rgba(32, 45, 74, 0.85);
  --bg-input: rgba(13, 20, 36, 0.8);
  --bg-badge: rgba(255, 255, 255, 0.06);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.18);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --time-color: #38bdf8;
  --gradient-logo: linear-gradient(90deg, #ffffff 0%, #cbd5e1 100%);
  --bg-radial: radial-gradient(at 10% 10%, rgba(0, 169, 224, 0.12) 0px, transparent 50%),
               radial-gradient(at 90% 20%, rgba(0, 168, 77, 0.12) 0px, transparent 50%),
               radial-gradient(at 50% 80%, rgba(0, 51, 160, 0.12) 0px, transparent 50%);
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.35);

  /* Seoul & Metropolitan Line Colors */
  --line-1: #0033A0;
  --line-1-bg: rgba(0, 51, 160, 0.2);
  --line-2: #00A84D;
  --line-2-bg: rgba(0, 168, 77, 0.2);
  --line-3: #EF7C1C;
  --line-3-bg: rgba(239, 124, 28, 0.2);
  --line-4: #00A9E0;
  --line-4-bg: rgba(0, 169, 224, 0.2);
  --line-5: #996CAD;
  --line-5-bg: rgba(153, 108, 173, 0.2);
  --line-6: #CD7C2F;
  --line-6-bg: rgba(205, 124, 47, 0.2);
  --line-7: #747F00;
  --line-7-bg: rgba(116, 127, 0, 0.2);
  --line-8: #EA5480;
  --line-8-bg: rgba(234, 84, 128, 0.2);
  --line-9: #BDB092;
  --line-9-bg: rgba(189, 176, 146, 0.2);
  --line-default: #64748b;

  --accent-express: #ff4757;
  --accent-arriving: #2ed573;
  --accent-warning: #ffa502;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-column: rgba(248, 250, 252, 0.85);
  --bg-train-card: #ffffff;
  --bg-train-card-hover: #f8fafc;
  --bg-input: #ffffff;
  --bg-badge: rgba(0, 0, 0, 0.05);
  --border-color: rgba(0, 0, 0, 0.1);
  --border-hover: rgba(0, 0, 0, 0.22);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  --time-color: #0284c7;
  --gradient-logo: linear-gradient(90deg, #0f172a 0%, #334155 100%);
  --bg-radial: radial-gradient(at 10% 10%, rgba(0, 169, 224, 0.08) 0px, transparent 50%),
               radial-gradient(at 90% 20%, rgba(0, 168, 77, 0.08) 0px, transparent 50%),
               radial-gradient(at 50% 80%, rgba(0, 51, 160, 0.08) 0px, transparent 50%);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.08);
}

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

body {
  background-color: var(--bg-primary);
  background-image: var(--bg-radial);
  background-attachment: fixed;
  color: var(--text-main);
  font-family: var(--font-family);
  min-height: 100vh;
  line-height: 1.5;
  padding-bottom: 40px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 24px 16px;
}

/* Header */
.app-header {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
}

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

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 46px;
  height: 46px;
  background: linear-gradient(135deg, #00A84D 0%, #00A9E0 100%);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 4px 16px rgba(0, 168, 77, 0.35);
}

.logo-text h1 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: var(--gradient-logo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-text p {
  font-size: 0.825rem;
  color: var(--text-muted);
}

.header-right-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-link-btn, .logout-btn, .theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-badge);
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.doc-link-btn:hover, .theme-toggle-btn:hover {
  background: var(--border-hover);
  color: var(--text-main);
  border-color: var(--border-hover);
}

.logout-btn:hover {
  background: rgba(255, 71, 87, 0.15);
  color: #ff4757;
  border-color: rgba(255, 71, 87, 0.3);
}

/* Primary Stations Bar */
.target-stations-section {
  margin-bottom: 24px;
}

.section-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-label .star-icon {
  color: #f59e0b;
}

.section-label .db-icon {
  font-size: 1rem;
}

.primary-stations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.station-card-btn {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  text-align: left;
}

.station-card-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--line-color, var(--line-default));
  transition: width 0.2s ease;
}

.station-card-btn:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card);
}

.station-card-btn.active {
  background: var(--bg-card-hover);
  border-color: var(--line-color, var(--line-default));
  box-shadow: 0 0 16px rgba(0, 0, 0, 0.15), inset 0 0 0 1px var(--line-color, var(--line-default));
}

.station-card-btn.active::before {
  width: 6px;
}

.station-btn-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 6px;
}

.station-btn-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.line-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.725rem;
  font-weight: 700;
  color: #ffffff;
  background-color: var(--line-color, var(--line-default));
  white-space: nowrap;
}

.station-btn-desc {
  font-size: 0.775rem;
  color: var(--text-muted);
}

.click-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Search Bar & Presets */
.search-section {
  margin-bottom: 24px;
}

.search-container {
  display: flex;
  gap: 8px;
}

.search-input-wrapper {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
}

.search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px 12px 42px;
  color: var(--text-main);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: all 0.2s ease;
}

.search-input:focus {
  border-color: #00A9E0;
  box-shadow: 0 0 0 3px rgba(0, 169, 224, 0.15);
  background: var(--bg-input);
}

.search-btn {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0 20px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.search-btn:hover {
  background: linear-gradient(135deg, #334155 0%, #475569 100%);
  border-color: var(--border-hover);
}

.quick-preset-container {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.preset-label {
  font-size: 0.775rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.preset-chip {
  background: var(--bg-badge);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 16px;
  font-size: 0.775rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.preset-chip:hover {
  background: var(--border-hover);
  color: var(--text-main);
  border-color: var(--chip-color, var(--border-hover));
}

/* Dashboard Card */
.dashboard-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Dashboard Header */
.dash-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 20px;
}

.dash-title-group {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.current-station-name {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.line-tabs {
  display: flex;
  gap: 6px;
  align-items: center;
}

.line-tab-btn {
  background: var(--bg-badge);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.line-tab-btn:hover {
  background: var(--border-hover);
  color: var(--text-main);
}

.line-tab-btn.active {
  background: var(--tab-color, #3b82f6);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.dash-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.auto-refresh-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-badge);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.refresh-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--accent-arriving);
  border-radius: 50%;
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(46, 213, 115, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(46, 213, 115, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(46, 213, 115, 0); }
}

.refresh-btn {
  background: var(--bg-badge);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.refresh-btn:hover {
  background: var(--border-hover);
  transform: rotate(45deg);
}

.refresh-btn.spinning svg {
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  100% { transform: rotate(360deg); }
}

/* Two Column Direction Layout */
.columns-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

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

.direction-column {
  background: var(--bg-column);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.col-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.dir-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #38bdf8;
}

.dir-indicator.down {
  background: #4ade80;
}

.train-count-badge {
  font-size: 0.75rem;
  background: var(--bg-badge);
  padding: 2px 8px;
  border-radius: 10px;
  color: var(--text-muted);
}

/* Train Arrival Card */
.train-card {
  background: var(--bg-train-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.train-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-train-card-hover);
}

.train-card.arriving-soon {
  border-color: rgba(46, 213, 115, 0.4);
  background: linear-gradient(135deg, rgba(46, 213, 115, 0.08) 0%, var(--bg-train-card) 100%);
}

.train-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.train-destination {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.badges-group {
  display: flex;
  gap: 6px;
  align-items: center;
}

.type-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-badge);
  color: var(--text-muted);
}

.type-badge.express {
  background: rgba(255, 71, 87, 0.15);
  color: var(--accent-express);
  border: 1px solid rgba(255, 71, 87, 0.3);
}

.train-time-msg {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--time-color);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.train-card.arriving-soon .train-time-msg {
  color: var(--accent-arriving);
}

.current-loc-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.825rem;
  color: var(--text-muted);
  padding-top: 8px;
  border-top: 1px dashed var(--border-color);
}

.loc-station {
  display: flex;
  align-items: center;
  gap: 6px;
}

.train-no {
  font-family: monospace;
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* Track Visualizer */
.track-visual {
  margin-top: 12px;
  padding-top: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.track-line {
  flex: 1;
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
  position: relative;
  overflow: hidden;
}

.track-progress {
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, var(--accent-arriving));
  border-radius: 2px;
}

.train-icon-small {
  font-size: 0.85rem;
}

/* Loading & Empty States */
.loading-state, .empty-state, .error-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-color);
  border-radius: 50%;
  border-top-color: #38bdf8;
  animation: spin 0.9s ease-in-out infinite;
  margin: 0 auto 16px;
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.6;
}

/* MariaDB History Section */
.history-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: 24px;
}

.history-chips-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.history-chip {
  background: var(--bg-badge);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.history-chip:hover {
  background: var(--border-hover);
  color: var(--text-main);
  border-color: var(--border-hover);
}

.history-chip .chip-time {
  font-size: 0.725rem;
  color: var(--text-dim);
}

.history-chip-placeholder {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Login Page Styles */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-container {
  width: 100%;
  max-width: 400px;
}

.login-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  box-shadow: var(--shadow-card);
  position: relative;
}

.login-top-bar {
  position: absolute;
  top: 16px;
  right: 16px;
}

.login-logo {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, #00A84D 0%, #00A9E0 100%);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  margin: 0 auto 20px;
  box-shadow: 0 6px 20px rgba(0, 168, 77, 0.4);
}

.login-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.login-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: left;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.login-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  color: var(--text-main);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: all 0.2s ease;
}

.login-input:focus {
  border-color: #00A9E0;
  box-shadow: 0 0 0 3px rgba(0, 169, 224, 0.2);
}

.login-btn {
  width: 100%;
  background: linear-gradient(135deg, #00A84D 0%, #00A9E0 100%);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  padding: 14px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px rgba(0, 169, 224, 0.3);
}

.login-btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.login-error-msg {
  background: rgba(255, 71, 87, 0.15);
  border: 1px solid rgba(255, 71, 87, 0.3);
  color: #ff4757;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  text-align: center;
}

.login-footer {
  margin-top: 28px;
  font-size: 0.775rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

/* Footer */
.app-footer {
  margin-top: 36px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

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

.footer-link:hover {
  color: #38bdf8;
  text-decoration: underline;
}