:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
    --danger: #ef4444;
    --border-radius: 12px;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

.app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--card-bg);
}

.stats-row {
    display: flex;
    gap: 15px;
}

.stat-pill {
    font-size: 0.9rem;
    background: var(--card-bg);
    padding: 8px 12px;
    border-radius: 20px;
    color: var(--accent-green);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

#tolls-balance-display {
    color: var(--accent-blue);
}

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

.balance-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
}

.balance-value {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    margin-top: 5px;
}

.positive {
    color: var(--accent-green);
}

.negative {
    color: var(--danger);
}

.driver-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
    cursor: pointer;
}

.driver-link:hover {
    color: var(--accent-blue);
    text-decoration: underline;
}

.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input,
select {
    width: 100%;
    padding: 10px;
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 6px;
    color: white;
    box-sizing: border-box;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--accent-blue);
}

button {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

button:hover {
    opacity: 0.9;
}

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

.btn-secondary {
    background: var(--accent-green);
    color: white;
}

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

.inline-form {
    display: flex;
    gap: 10px;
}

.inline-form button {
    width: auto;
    padding: 10px 20px;
    background: var(--card-bg);
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
}

#fuel-price-display {
    font-size: 0.9rem;
    background: var(--card-bg);
    padding: 8px 12px;
    border-radius: 20px;
    color: var(--accent-green);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.nav-tab {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
    flex: 1;
    text-align: center;
    white-space: nowrap;
}

.nav-tab:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-tab.active {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.form-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.form-section.active {
    display: block;
}

.hidden {
    display: none !important;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 15px;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 5px;
    transition: background 0.2s;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

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

/* Settings Modal */
.settings-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.settings-content {
    background: var(--bg-color);
    padding: 30px;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    max-height: 90vh;
    overflow-y: auto;
}

/* Settings Modal */
.settings-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.settings-content {
    background: var(--bg-color);
    padding: 30px;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    max-height: 90vh;
    overflow-y: auto;
}