/* Modern Dark/Blue Theme for Dynamic Pace Converter */

:root {
  --primary-bg: #0a0e1a;
  --secondary-bg: #1a1f2e;
  --card-bg: #252b3d;
  --accent-blue: #4f8ff7;
  --accent-light: #6ba3f7;
  --accent-dark: #2d5db5;
  --accent-green: #10b981;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #8892b0;
  --border-color: #334155;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.4);
  --border-radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, var(--primary-bg) 0%, #0f172a 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  font-size: 16px;
}

.container {
  max-width: 850px;
  margin: 0 auto;
  padding: 2rem 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 3rem;
}

.header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.header p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  backdrop-filter: blur(10px);
  animation: slideInUp 0.6s ease-out;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-blue);
  transform: translateY(-4px);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-icon {
  width: 20px;
  height: 20px;
  color: var(--accent-blue);
}

/* Mode Selector */
.mode-selector {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin: 0 auto 2rem auto;
  background: var(--secondary-bg);
  padding: 0.5rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  max-width: 600px;
}

.mode-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.mode-btn:hover {
  background: rgba(79, 143, 247, 0.1);
  color: var(--accent-light);
}

.mode-btn.active {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-light));
  color: white;
  box-shadow: 0 4px 15px rgba(79, 143, 247, 0.3);
}

.mode-icon {
  width: 18px;
  height: 18px;
}

.mode-icon svg {
  width: 100%;
  height: 100%;
}

.mode-text {
  font-weight: 500;
  white-space: nowrap;
}

/* Input Container */
.input-container {
  position: relative;
  min-height: 200px;
  margin-bottom: 2rem;
}

.input-mode {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s ease;
  pointer-events: none;
}

.input-mode.active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.input-mode.visible {
  position: relative;
}

/* Input Row */
.input-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.input-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
  min-width: 120px;
}

.input-field.wide {
  flex: 2;
}

.input-field.small {
  flex: 0 0 80px;
}

.input-field label {
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.input-field input,
.input-field select {
  background: var(--secondary-bg);
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.875rem 1rem;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 500;
  transition: var(--transition);
  text-align: center;
}

.input-field select {
  cursor: pointer;
  appearance: none !important;
  -webkit-appearance: none !important;
  -moz-appearance: none !important;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f8fafc' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1rem;
  padding-right: 3rem;
  background-color: var(--secondary-bg) !important;
  border: 2px solid var(--border-color) !important;
  color: var(--text-primary) !important;
}

.input-field select option {
  background: var(--secondary-bg) !important;
  background-color: var(--secondary-bg) !important;
  color: var(--text-primary) !important;
  border: none !important;
  padding: 0.5rem;
}

.input-field select option:checked,
.input-field select option:hover,
.input-field select option:focus {
  background: var(--accent-blue) !important;
  background-color: var(--accent-blue) !important;
  color: white !important;
}

/* Browser-specific select styling fixes */
.input-field select::-webkit-scrollbar {
  width: 8px;
}

.input-field select::-webkit-scrollbar-track {
  background: var(--secondary-bg);
}

.input-field select::-webkit-scrollbar-thumb {
  background: var(--accent-blue);
  border-radius: 4px;
}

/* Firefox specific */
@-moz-document url-prefix() {
  .input-field select {
    background-image: none;
    padding-right: 1rem;
  }

  .input-field select option {
    background-color: var(--secondary-bg) !important;
    color: var(--text-primary) !important;
  }
}

.input-field input:focus,
.input-field select:focus {
  outline: none !important;
  border-color: var(--accent-blue) !important;
  box-shadow: 0 0 0 3px rgba(79, 143, 247, 0.1) !important;
  background: rgba(79, 143, 247, 0.05) !important;
  background-color: rgba(79, 143, 247, 0.05) !important;
  transform: scale(1.02);
}

.input-field select:focus option {
  background: var(--secondary-bg);
  color: var(--text-primary);
}

.input-separator {
  font-size: 2rem;
  font-weight: 300;
  color: var(--accent-blue);
  margin: 0 0.5rem;
  align-self: flex-end;
  padding-bottom: 0.875rem;
}

.time-inputs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 2;
}

/* Result Display */
.result-display {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-light));
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  color: white;
  position: relative;
  overflow: hidden;
}

.result-display::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.5s;
}

.result-display:hover::before {
  left: 100%;
}

.result-value {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.result-unit {
  font-size: 1rem;
  opacity: 0.9;
  font-weight: 500;
}

/* Dual result display for race mode */
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

.result-item-inline {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
}

.result-item-inline .result-value {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

@media (max-width: 767px) {
  .result-row {
    gap: 1rem;
  }

  .result-item-inline .result-value {
    font-size: 1.5rem;
  }
}

/* Action Button */
.action-btn {
  background: linear-gradient(135deg, var(--accent-green), #34d399);
  color: white;
  border: none;
  padding: 1rem 2rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.action-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
}

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

.action-btn.loading {
  background: var(--text-muted);
  cursor: not-allowed;
  animation: pulse 1.5s ease-in-out infinite;
}

.action-btn.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.btn-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.action-btn:hover .btn-icon {
  transform: translateX(4px);
}

/* Results Section */
.results-section {
  margin-top: 2rem;
  animation: slideInUp 0.8s ease-out 0.2s both;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 850px;
  margin: 0 auto;
}

.result-item {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
  width: 160px;
  min-height: 80px;
}

.result-item:hover {
  background: rgba(79, 143, 247, 0.05);
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.result-distance {
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.result-time {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: 'Monaco', 'Consolas', monospace;
}

/* Footer */
.footer {
  margin-top: 3rem;
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
}

/* Error Messages */
.error-message {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  color: var(--error);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-weight: 500;
}

/* Responsive Design */
@media (min-width: 768px) {
  .main-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

  .header h1 {
    font-size: 3rem;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 3rem 2rem;
  }

  .card {
    padding: 2.5rem;
  }
}

@media (max-width: 767px) {
  .mode-selector {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .mode-btn {
    flex-direction: row;
    justify-content: center;
    padding: 0.75rem;
  }

  .input-row {
    flex-direction: column;
    align-items: stretch;
  }

  .time-inputs {
    flex-direction: row;
    justify-content: center;
  }

  .input-separator {
    align-self: center;
    padding-bottom: 0;
  }

  .result-value {
    font-size: 2rem;
  }

  .header h1 {
    font-size: 2rem;
  }

  .container {
    padding: 1rem;
  }

  .card {
    padding: 1.5rem;
  }

  .results-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 400px;
  }

  .container {
    max-width: 400px;
  }

  .mode-selector {
    max-width: 350px;
  }

  .action-btn {
    max-width: 250px;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .container {
    max-width: 600px;
  }

  .results-grid {
    max-width: 600px;
  }

  .mode-selector {
    max-width: 450px;
  }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--primary-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-blue);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-light);
}