:root {
            --bg-primary: #0a0e1a;
            --bg-card: rgba(14, 20, 36, 0.7);
            --bg-card-solid: #0e1424;
            --border: rgba(148, 163, 184, 0.08);
            --border-hover: rgba(148, 163, 184, 0.15);
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --accent-teal: #2dd4bf;
            --accent-blue: #38bdf8;
            --accent-amber: #fbbf24;
            --accent-red: #f87171;
            --accent-green: #4ade80;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            overflow-x: hidden;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
        }
        .mono { font-family: 'JetBrains Mono', monospace; }

        /* ─── Topographic Background ─── */
        .topo-bg {
            position: fixed; inset: 0; z-index: 0; pointer-events: none;
            opacity: 0.03;
            background-image: url("data:image/svg+xml,%3Csvg width='400' height='400' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 200 Q100 150 200 200 T400 200' fill='none' stroke='%2338bdf8' stroke-width='1'/%3E%3Cpath d='M0 180 Q120 130 200 180 T400 180' fill='none' stroke='%2338bdf8' stroke-width='0.5'/%3E%3Cpath d='M0 220 Q80 170 200 220 T400 220' fill='none' stroke='%2338bdf8' stroke-width='0.5'/%3E%3Cpath d='M0 100 Q100 50 200 100 T400 100' fill='none' stroke='%232dd4bf' stroke-width='0.8'/%3E%3Cpath d='M0 300 Q100 250 200 300 T400 300' fill='none' stroke='%232dd4bf' stroke-width='0.8'/%3E%3C/svg%3E");
            background-size: 400px 400px;
        }

        /* ─── Ambient Light ─── */
        .ambient {
            position: fixed; z-index: 0; pointer-events: none;
            border-radius: 50%;
            filter: blur(150px);
        }
        .ambient-1 { width: 500px; height: 500px; background: rgba(45,212,191,0.06); top: -150px; right: -100px; }
        .ambient-2 { width: 400px; height: 400px; background: rgba(56,189,248,0.04); bottom: -100px; left: -100px; }

        /* ─── Water Ripple Canvas ─── */
        #ripple-canvas {
            position: fixed; inset: 0; z-index: 0;
            pointer-events: none; opacity: 0.15;
        }

        /* ─── Cards ─── */
        .card {
            background: var(--bg-card);
            backdrop-filter: blur(20px) saturate(1.2);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card:hover {
            border-color: var(--border-hover);
            box-shadow: 0 8px 32px rgba(0,0,0,0.2);
        }
        .card-solid {
            background: var(--bg-card-solid);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
        }

        /* ─── Typography ─── */
        .display { font-weight: 800; letter-spacing: -0.03em; line-height: 1.05; }
        .heading { font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }
        .label { font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-muted); }

        /* ─── Accent Line ─── */
        .accent-line {
            width: 40px; height: 3px;
            background: linear-gradient(90deg, var(--accent-teal), var(--accent-blue));
            border-radius: 2px;
        }

        /* ─── Buttons ─── */
        .btn-primary {
            background: linear-gradient(135deg, var(--accent-teal), var(--accent-blue));
            color: #0a0e1a;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius);
            border: none;
            cursor: pointer;
            font-size: 0.9375rem;
            transition: all 0.25s ease;
            position: relative;
            overflow: hidden;
        }
        .btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(45,212,191,0.25); }
        .btn-primary:active { transform: translateY(0); }
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 10px 20px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            cursor: pointer;
            font-size: 0.8125rem;
            transition: all 0.2s;
        }
        .btn-secondary:hover { border-color: var(--border-hover); background: rgba(255,255,255,0.02); }

        /* ─── Risk Levels ─── */
        .risk-safe { background: linear-gradient(135deg, #065f46, #059669); }
        .risk-warn { background: linear-gradient(135deg, #92400e, #d97706); }
        .risk-danger {
            background: linear-gradient(135deg, #991b1b, #dc2626);
            animation: pulse-glow 2s ease-in-out infinite;
        }
        @keyframes pulse-glow {
            0%, 100% { box-shadow: 0 0 20px rgba(220,38,38,0.2); }
            50% { box-shadow: 0 0 40px rgba(220,38,38,0.4); }
        }

        /* ─── Status Chip ─── */
        .chip {
            display: inline-flex; align-items: center; gap: 6px;
            padding: 5px 12px;
            border-radius: 999px;
            font-size: 0.6875rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .chip-live {
            background: rgba(45,212,191,0.1);
            border: 1px solid rgba(45,212,191,0.2);
            color: var(--accent-teal);
        }
        .chip-replay {
            background: rgba(251,191,36,0.1);
            border: 1px solid rgba(251,191,36,0.2);
            color: var(--accent-amber);
        }

        /* ─── Loading ─── */
        .loader-bar {
            height: 2px; background: var(--border); border-radius: 1px; overflow: hidden;
        }
        .loader-bar-fill {
            height: 100%; width: 0%;
            background: linear-gradient(90deg, var(--accent-teal), var(--accent-blue));
            transition: width 0.8s ease;
            border-radius: 1px;
        }

        /* ─── Screen transitions ─── */
        .screen { display: none; }
        .screen.active { display: block; animation: screenIn 0.4s cubic-bezier(0.16, 1, 0.3, 1); }
        @keyframes screenIn {
            from { opacity: 0; transform: translateY(12px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* ─── Map ─── */
        #map { border-radius: var(--radius); z-index: 5; }
        .leaflet-container { background: var(--bg-primary) !important; }

        /* ─── Scrollbar ─── */
        ::-webkit-scrollbar { width: 5px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: rgba(148,163,184,0.15); border-radius: 3px; }

        /* ─── Drop zone ─── */
        .drop-zone {
            border: 1.5px dashed rgba(148,163,184,0.15);
            transition: all 0.3s;
            cursor: pointer;
        }
        .drop-zone:hover, .drop-zone.dragover {
            border-color: var(--accent-teal);
            background: rgba(45,212,191,0.03);
        }

        /* ─── Replay badge ─── */
        .replay-badge {
            position: fixed; top: 16px; right: 16px; z-index: 100;
            display: none;
        }
        .replay-badge.visible { display: block; }

        /* ─── Data Metric ─── */
        .metric { text-align: center; }
        .metric-value { font-size: 1.75rem; font-weight: 800; letter-spacing: -0.02em; }
        .metric-label { font-size: 0.6875rem; color: var(--text-muted); margin-top: 2px; letter-spacing: 0.02em; }

        /* ─── Section divider ─── */
        .divider { height: 1px; background: var(--border); margin: 24px 0; }

        /* ─── Evac card ─── */
        .evac-card {
            position: relative;
            padding-left: 20px;
        }
        .evac-card::before {
            content: '';
            position: absolute; left: 0; top: 8px;
            width: 6px; height: 6px;
            background: var(--accent-red);
            border-radius: 50%;
            box-shadow: 0 0 8px rgba(248,113,113,0.5);
        }

        /* ─── Containers ─── */
        .container { max-width: 720px; margin: 0 auto; padding: 0 20px; }
        .container-wide { max-width: 960px; margin: 0 auto; padding: 0 20px; }

        /* ─── Feature Grid ─── */
        .feature-icon {
            width: 40px; height: 40px;
            border-radius: 10px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.125rem;
            flex-shrink: 0;
        }

        /* ─── Toggle ─── */
        .toggle-track {
            width: 44px; height: 24px;
            border-radius: 12px;
            background: rgba(148,163,184,0.15);
            cursor: pointer;
            position: relative;
            transition: all 0.3s;
            border: 1px solid var(--border);
        }
        .toggle-track.active {
            background: rgba(251,191,36,0.2);
            border-color: rgba(251,191,36,0.3);
        }
        .toggle-dot {
            width: 18px; height: 18px;
            border-radius: 50%;
            background: var(--text-secondary);
            position: absolute; top: 2px; left: 2px;
            transition: all 0.3s;
        }
        .toggle-track.active .toggle-dot {
            left: 22px;
            background: var(--accent-amber);
        }

        /* ─── Progress Steps ─── */
        .step-item {
            display: flex; align-items: center; gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius);
            background: rgba(255,255,255,0.02);
            border: 1px solid var(--border);
            transition: all 0.4s;
        }
        .step-item.active { border-color: rgba(45,212,191,0.3); background: rgba(45,212,191,0.03); }
        .step-item.done { border-color: rgba(74,222,128,0.2); }
        .step-num {
            width: 28px; height: 28px;
            border-radius: 8px;
            display: flex; align-items: center; justify-content: center;
            font-size: 0.75rem; font-weight: 700;
            background: rgba(148,163,184,0.1);
            color: var(--text-muted);
            flex-shrink: 0;
            transition: all 0.3s;
        }
        .step-item.active .step-num { background: rgba(45,212,191,0.15); color: var(--accent-teal); }
        .step-item.done .step-num { background: rgba(74,222,128,0.15); color: var(--accent-green); }

        /* ─── Quick Action Pills ─── */
        .pill {
            display: inline-flex; align-items: center; gap: 6px;
            padding: 8px 14px;
            border-radius: 10px;
            font-size: 0.8125rem;
            font-weight: 500;
            background: rgba(255,255,255,0.03);
            border: 1px solid var(--border);
            color: var(--text-secondary);
        }