:root {
    --bg-dark: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --panel-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --accent: #10b981;
    --accent-hover: #059669;
    --gradient-bg: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --coverage-color: rgba(59, 130, 246, 0.2);
    --coverage-border: rgba(59, 130, 246, 0.8);
    --station-color: #10b981;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    background: var(--gradient-bg);
    min-height: 100vh;
    display: flex;
    overflow: hidden;
}

.app-container {
    display: flex;
    width: 100%;
    height: 100vh;
    padding: 20px;
    gap: 20px;
}

/* Map Section (Left) */
.map-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    backdrop-filter: blur(12px);
    overflow: hidden;
    position: relative;
}

.map-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--panel-border);
}

.map-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.badge {
    font-size: 0.75rem;
    background: var(--primary);
    padding: 4px 8px;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.map-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.canvas-container {
    flex: 1;
    position: relative;
    overflow: auto;
    background-color: #1a1a2e; /* Dark fallback */
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: crosshair;
}

#background-map {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    pointer-events: none;
    z-index: 0;
}

#mapCanvas {
    max-width: none;
    display: none; /* hidden until uploaded */
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    transform-origin: 0 0;
    position: relative;
    z-index: 1;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    color: var(--text-muted);
}

.scale-overlay {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(8px);
    padding: 12px 16px;
    border-radius: 8px;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.scale-input-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.scale-input-group label {
    font-size: 0.9rem;
    color: var(--text-main);
    white-space: nowrap;
}

.scale-input-group input {
    width: 80px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 6px 10px;
    border-radius: 6px;
    outline: none;
}

.scale-input-group select {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 6px 10px;
    border-radius: 6px;
    outline: none;
    cursor: pointer;
}

.map-controls {
    padding: 16px 24px;
    border-top: 1px solid var(--panel-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 23, 42, 0.5);
}

/* Sidebar (Right) */
.sidebar {
    width: 400px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    padding-right: 4px;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}
.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 4px;
}

.panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    padding: 24px;
    backdrop-filter: blur(12px);
}

.summary-panel {
    text-align: center;
    background: linear-gradient(145deg, rgba(30,41,59,0.9), rgba(15,23,42,0.9));
    border-top: 4px solid var(--accent);
}

.summary-panel h2 {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 600;
}

.result-number {
    font-size: 4rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin: 10px 0;
    text-shadow: 0 0 20px rgba(16, 185, 129, 0.4);
}

.result-number .unit {
    font-size: 1.5rem;
    color: var(--text-main);
    margin-left: 4px;
}

.panel h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 10px;
}

.input-group {
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-row {
    display: flex;
    gap: 12px;
}
.input-row .input-group { flex: 1; }

label {
    font-size: 0.9rem;
    font-weight: 600;
    color: #e2e8f0;
}

input[type="number"] {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: all 0.2s;
}

input[type="number"]:focus, input[type="text"]:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

.helper-text {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Buttons */
button {
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }

.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
}
.btn-secondary:hover:not(:disabled) { background: rgba(255,255,255,0.2); }

.btn-icon {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
}
.btn-icon:hover:not(:disabled) { background: rgba(255,255,255,0.2); }
.btn-icon.active {
    background: rgba(245, 158, 11, 0.2);
    border-color: #f59e0b;
    color: #f59e0b;
}

.btn-icon.text-red {
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.3);
}
.btn-icon.text-red:hover:not(:disabled) {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
}

.draw-tools {
    display: flex;
    gap: 8px;
}

.zoom-controls {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(8px);
    padding: 8px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.zoom-controls button {
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    padding: 0;
}

.zoom-controls button:hover:not(:disabled) {
    background: rgba(255,255,255,0.2);
}
.zoom-controls button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-accent {
    width: 100%;
    background: #f59e0b;
    color: #1e1b4b;
    padding: 12px;
    margin-top: 8px;
}
.btn-accent:hover { background: #d97706; }

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ─── Google Maps Search Modal ─────────────────────────────────────────────── */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 14px;
    width: 98%;
    max-width: 1152px;
    height: 95vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

.modal-header h3 {
    color: #f8fafc;
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-close-btn {
    background: none;
    border: none;
    color: #94a3b8;
    font-size: 1.6rem;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
    border-radius: 4px;
    transition: color 0.2s, background 0.2s;
}

.modal-close-btn:hover {
    color: #f8fafc;
    background: rgba(255, 255, 255, 0.1);
}

.modal-search-bar {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
    align-items: center;
}

.modal-search-bar input[type="text"] {
    flex: 1;
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid #475569;
    background: #0f172a;
    color: #f8fafc;
    font-size: 0.95rem;
    outline: none;
    font-family: 'Inter', sans-serif;
}

.modal-search-bar input[type="text"]:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

#google-map-container {
    flex: 1;
    min-height: 0;
    background: #0f172a;
}

.modal-footer {
    padding: 12px 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

.modal-hint {
    color: #94a3b8;
    font-size: 0.82rem;
    margin: 0 0 10px 0;
    line-height: 1.4;
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

/* Google Places autocomplete dropdown dark styling */
.pac-container {
    background-color: #1e293b;
    border: 1px solid #475569;
    border-radius: 6px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    font-family: 'Inter', sans-serif;
}

.pac-item {
    color: #cbd5e1;
    border-top: 1px solid #334155;
    padding: 8px 12px;
    cursor: pointer;
}

.pac-item:hover,
.pac-item-selected {
    background-color: #334155;
}

.pac-item-query {
    color: #f8fafc;
    font-size: 0.9rem;
}

.pac-matched {
    color: #3b82f6;
}

.pac-icon {
    filter: invert(1) brightness(0.6);
}