:root {
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --danger-color: #dc2626;
    --danger-hover: #b91c1c;
    --success-bg: #dcfce7;
    --success-text: #166534;
    --warning-bg: #fef9c3;
    --warning-text: #854d0e;
    --muted-color: #64748b;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --text-color: #f1f5f9;
        --card-bg: #1e293b;
        --border-color: #334155;
        --primary-color: #3b82f6;
        --primary-hover: #60a5fa;
        --danger-color: #ef4444;
        --danger-hover: #f87171;
        --success-bg: #064e3b;
        --success-text: #6ee7b7;
        --warning-bg: #78350f;
        --warning-text: #fde047;
        --muted-color: #94a3b8;
    }
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    padding: 20px;
    max-width: 960px;
    margin: 0 auto;
}

h1, h2, h3 {
    margin-bottom: 1rem;
    font-weight: 600;
}

p {
    margin-bottom: 1rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 25px;
}

footer {
    margin-top: 40px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--muted-color);
    text-align: center;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 20px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

label {
    font-weight: 500;
    font-size: 0.9rem;
}

input[type="text"],
input[type="number"],
input[type="password"] {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    border-radius: 4px;
    font-size: 1rem;
}

input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -1px;
}

.btn {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
}

.btn:hover {
    background-color: var(--primary-hover);
}

.btn-danger {
    background-color: var(--danger-color);
}

.btn-danger:hover {
    background-color: var(--danger-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th, td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

th {
    font-weight: 600;
    background-color: rgba(0, 0, 0, 0.02);
}

tr:hover {
    background-color: rgba(0, 0, 0, 0.01);
}

code {
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.85rem;
    background-color: rgba(0, 0, 0, 0.05);
    padding: 2px 4px;
    border-radius: 3px;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 0.8rem;
    border-radius: 12px;
    font-weight: 500;
}

.badge-success {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.badge-warning {
    background-color: var(--warning-bg);
    color: var(--warning-text);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.metric-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 15px;
    text-align: center;
}

.metric-label {
    font-size: 0.8rem;
    color: var(--muted-color);
    text-transform: uppercase;
    margin-bottom: 5px;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 600;
}

.alert-banner {
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-banner.danger {
    background-color: var(--danger-color);
    color: #ffffff;
}

.alert-banner.warning {
    background-color: var(--warning-bg);
    color: var(--warning-text);
    border: 1px solid var(--border-color);
}

.alert-banner.success {
    background-color: var(--success-bg);
    color: var(--success-text);
    border: 1px solid var(--border-color);
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 8px;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
    font-size: 1.4rem;
    margin: 0;
}

.gps-coords {
    margin-top: 15px;
    font-size: 0.8rem;
    color: var(--muted-color);
    display: flex;
    gap: 5px;
    align-items: center;
    justify-content: center;
}

.gps-coords code {
    font-size: 0.8rem;
}

.btn-block {
    width: 100%;
    display: block;
    padding: 12px;
    font-size: 1rem;
}

@media (max-width: 600px) {
    body {
        padding: 12px;
    }
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    .metric-card {
        padding: 10px;
    }
    .metric-value {
        font-size: 1.25rem;
    }
    .card {
        padding: 15px;
        margin-bottom: 12px;
    }
    #map {
        height: 250px !important;
    }
}

.btn:disabled, .btn[disabled] {
    cursor: not-allowed;
    opacity: 0.65;
}

.badge-danger {
    background-color: var(--danger-color);
    color: #ffffff;
}

#map-container {
    margin-bottom: 20px;
    position: relative;
    display: none;
}

#map {
    width: 100%;
    height: 350px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

#btn-center-map {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 10;
    padding: 6px 12px;
    font-size: 0.8rem;
    background: var(--card-bg, #ffffff);
    color: var(--text-color, #1f2937);
    border: 1px solid var(--border-color);
    cursor: pointer;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    display: none;
}

#safety-status-container {
    margin-top: 15px;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
    text-align: center;
    display: none;
}

#safety-status-value {
    display: block;
    width: 100%;
}

#safety-status-time {
    font-size: 0.85rem;
    color: var(--muted-color);
    margin-top: 8px;
}

.safety-status-badge {
    display: block;
    width: 100%;
    box-sizing: border-box;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1.1rem;
    color: #ffffff;
    text-align: center;
    border: 1px solid transparent;
}

.safety-status-badge.sent {
    background: #6b7280;
    border-color: #4b5563;
}

.safety-status-badge.received {
    background: #eab308;
    border-color: #ca8a04;
}

.safety-status-badge.ok {
    background: #22c55e;
    border-color: #16a34a;
}

.safety-status-badge.danger {
    background: #ef4444;
    border-color: #dc2626;
}

#no-telemetry-msg {
    text-align: center;
    color: var(--muted-color);
    padding: 30px 0;
}

#metrics-grid {
    display: none;
}

#time-ago {
    font-size: 1.1rem;
}

#gps-group {
    display: none;
}