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

:root {
    --bg: #f4f5f7;
    --card: #fff;
    --text: #1a1a2e;
    --text-secondary: #6b7280;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --error: #ef4444;
    --border: #e5e7eb;
    --radius: 12px;
    --shadow: 0 1px 3px rgb(0 0 0 / 8%), 0 1px 2px rgb(0 0 0 / 6%);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 10%), 0 4px 6px -2px rgb(0 0 0 / 5%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Tabs */
.tabs {
    display: flex;
    justify-content: center;
    gap: 4px;
    padding: 16px 16px 0;
    background: var(--card);
    border-bottom: 1px solid var(--border);
}

.tab {
    padding: 10px 24px;
    border: none;
    background: none;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.tab:hover {
    color: var(--text);
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Main layout */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tab-content {
    display: none;
    flex: 1;
    flex-direction: column;
}

.tab-content.active {
    display: flex;
}

/* Cards */
.card {
    background: var(--card);
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.card h1 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn.primary:disabled {
    background: #93c5fd;
    cursor: not-allowed;
}

.btn.small {
    padding: 6px 14px;
    font-size: 13px;
    background: var(--bg);
    color: var(--text);
    margin-top: 12px;
}

.btn.small:hover {
    background: var(--border);
}

/* Status */
.status {
    margin-top: 12px;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 14px;
}

.status.loading {
    background: #eff6ff;
    color: var(--primary);
}

.status.error {
    background: #fef2f2;
    color: var(--error);
}

/* Coordinates display */
.coords {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 16px;
    padding: 16px;
    background: var(--bg);
    border-radius: var(--radius);
}

.coord-group {
    flex: 1;
    min-width: 120px;
}

.coord-group label,
.result-item label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.coord-value {
    font-size: 18px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

/* Map */
.map-container {
    flex: 1;
    min-height: 400px;
}

/* Distance calculator inputs */
.input-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.input-group {
    flex: 1;
    min-width: 200px;
    position: relative;
}

.input-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.input-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.input-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgb(59 130 246 / 10%);
}

/* Autocomplete suggestions */
.suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-top: 4px;
    list-style: none;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    max-height: 200px;
    overflow-y: auto;
}

.suggestions li {
    padding: 10px 12px;
    font-size: 13px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
}

.suggestions li:last-child {
    border-bottom: none;
}

.suggestions li:hover {
    background: var(--bg);
}

/* Distance result */
.result {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 16px;
    padding: 16px;
    background: var(--bg);
    border-radius: var(--radius);
}

.result-item {
    flex: 1;
    min-width: 140px;
}

.result-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.result-value.small {
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

/* Footer */
footer {
    text-align: center;
    padding: 16px;
    font-size: 13px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    background: var(--card);
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (width <= 600px) {
    .tabs {
        padding: 12px 8px 0;
    }

    .tab {
        padding: 8px 16px;
        font-size: 14px;
    }

    .card {
        padding: 16px;
    }

    .card h1 {
        font-size: 18px;
    }

    .input-row {
        flex-direction: column;
    }

    .input-group {
        min-width: 100%;
    }

    .coords {
        flex-direction: column;
    }

    .map-container {
        min-height: 300px;
    }
}