/* ========================================
   Cycling Power Optimizer - Styles
   Modern dark theme with glassmorphism
   ======================================== */

:root {
    /* Color palette */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(25, 25, 35, 0.8);
    --bg-card-hover: rgba(35, 35, 50, 0.9);

    --accent-primary: #00d4ff;
    --accent-secondary: #7c3aed;
    --accent-gradient: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;

    /* Power zone colors */
    --zone-recovery: #3b82f6;
    --zone-endurance: #22c55e;
    --zone-tempo: #eab308;
    --zone-threshold: #f97316;
    --zone-vo2max: #ef4444;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background gradient effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(124, 58, 237, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* App Container */
.app-container {
    position: relative;
    z-index: 1;
    max-width: 1800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.6s ease;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: var(--accent-primary);
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.5));
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 300;
}

/* Info Button */
.info-btn {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    padding: 4px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    margin-left: var(--spacing-sm);
}

.info-btn:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.info-btn svg {
    width: 100%;
    height: 100%;
}

/* Info Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    padding: var(--spacing-lg);
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    max-width: 700px;
    max-height: 85vh;
    overflow-y: auto;
    padding: var(--spacing-xl);
    position: relative;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
}

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

.modal-content h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--accent-primary);
}

.info-section {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.info-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.info-section h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.info-section p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.formula {
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    color: var(--accent-primary);
    text-align: center;
    margin: var(--spacing-md) 0;
}

.formula-breakdown {
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-size: 0.85rem;
}

.formula-breakdown>div {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

.formula-breakdown strong {
    color: var(--text-primary);
}

.constants {
    font-size: 0.8rem !important;
    color: var(--text-muted) !important;
    font-style: italic;
}

.info-section ol {
    margin-left: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.info-section li {
    margin-bottom: var(--spacing-sm);
}

/* Main Content Layout */
.main-content {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: var(--spacing-xl);
    flex: 1;
}

/* Control Panel */
.control-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Cards */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    animation: fadeInUp 0.5s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card), var(--shadow-glow);
}

.card-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

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

/* File Upload */
.file-upload {
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.file-upload:hover,
.file-upload.dragover {
    border-color: var(--accent-primary);
    background: rgba(0, 212, 255, 0.05);
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl) var(--spacing-lg);
    cursor: pointer;
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.875rem;
    transition: color var(--transition-normal);
}

.upload-label:hover {
    color: var(--accent-primary);
}

.upload-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
    opacity: 0.7;
}

/* Route Info */
.route-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.info-item {
    text-align: center;
}

.info-label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.info-value {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-primary);
}

/* Input Groups */
.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.input-with-unit {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.input-with-unit input {
    flex: 1;
}

.unit {
    font-size: 0.875rem;
    color: var(--text-muted);
    min-width: 40px;
}

input[type="number"],
input[type="text"] {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

input[type="number"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
}

input[type="number"]::-webkit-inner-spin-button {
    opacity: 0.5;
}

/* Wind Direction */
.wind-direction-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

input[type="range"] {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: grab;
    transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.wind-compass {
    position: relative;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.compass-arrow {
    width: 4px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 2px;
    transform-origin: center bottom;
    transition: transform var(--transition-fast);
}

.compass-label {
    position: absolute;
    top: -6px;
    font-size: 0.65rem;
    color: var(--text-muted);
}

.wind-degrees {
    font-size: 0.9rem;
    color: var(--text-secondary);
    min-width: 35px;
    text-align: right;
}

/* Ride Mode */
.ride-mode-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.ride-mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: inherit;
}

.ride-mode-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

.ride-mode-btn.active {
    background: rgba(0, 212, 255, 0.15);
    border-color: var(--accent-primary);
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.2);
}

.mode-icon {
    font-size: 1.5rem;
}

.mode-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.mode-desc {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: center;
}

/* Target Intensity */
.intensity-info {
    margin-bottom: var(--spacing-md);
}

.intensity-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.intensity-slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.intensity-slider-container input[type="range"] {
    flex: 1;
}

.intensity-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-primary);
    min-width: 55px;
    text-align: right;
}

.intensity-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.auto-recommend-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-top: var(--spacing-md);
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--radius-sm);
    color: var(--accent-primary);
    font-size: 0.85rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.auto-recommend-btn:hover {
    background: rgba(0, 212, 255, 0.2);
    border-color: var(--accent-primary);
}

.btn-icon-sm {
    width: 16px;
    height: 16px;
}

.recommended-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: var(--radius-sm);
}

.recommended-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.recommended-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: #22c55e;
}

/* Calculate Button */
.calculate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 212, 255, 0.4);
}

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

.btn-icon {
    width: 20px;
    height: 20px;
}

/* Visualization Panel */
.visualization-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Map */
.map-card {
    flex: 0 0 auto;
}

.map-card .card-title {
    margin-bottom: var(--spacing-sm);
}

.map-container {
    height: 220px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-secondary);
}

.map-legend {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.65rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 12px;
    height: 4px;
    border-radius: 2px;
}

.legend-color.recovery {
    background: var(--zone-recovery);
}

.legend-color.endurance {
    background: var(--zone-endurance);
}

.legend-color.tempo {
    background: var(--zone-tempo);
}

.legend-color.threshold {
    background: var(--zone-threshold);
}

.legend-color.vo2max {
    background: var(--zone-vo2max);
}

/* Chart */
.chart-card {
    flex: 0 0 auto;
}

.chart-container {
    height: 200px;
    position: relative;
}

/* Results */
.results-card {
    opacity: 0.6;
    transition: opacity var(--transition-normal);
}

.results-card.active {
    opacity: 1;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.result-item {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
}

.result-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
}

.result-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* W' Gauge */
.wprime-gauge {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.wprime-gauge label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.gauge-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.gauge-fill {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, var(--zone-vo2max), var(--zone-tempo), var(--zone-endurance));
    border-radius: 4px;
    transition: width var(--transition-slow);
}

.gauge-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.loading-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 340px 1fr;
    }
}

@media (max-width: 992px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .control-panel {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .calculate-btn {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-md);
    }

    .control-panel {
        grid-template-columns: 1fr;
    }

    .route-info {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .map-legend {
        justify-content: center;
    }

    .logo h1 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .results-grid {
        grid-template-columns: 1fr 1fr;
    }

    .result-item:last-child {
        grid-column: 1 / -1;
    }
}

/* Leaflet custom styles */
.leaflet-container {
    background: var(--bg-secondary);
}

.leaflet-tile-pane {
    filter: brightness(0.9) contrast(1.1);
}