:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --accent-color: #00e676; /* Vibrant Green */
    --accent-glow: rgba(0, 230, 118, 0.3);
    --border-color: #333333;
    --error-color: #ff5252;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 1rem;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding-bottom: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
    padding-top: 1rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

.highlight {
    color: var(--accent-color);
}

header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.card {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    transition: transform 0.2s;
}

.card h2 {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.input-group {
    margin-bottom: 1.2rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: #2c2c2c;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.route-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.btn {
    padding: 0.8rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-secondary {
    background-color: #333;
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: #444;
}

.status-text {
    font-size: 0.85rem;
    margin-top: 0.5rem;
    color: var(--text-secondary);
}

.status-text.error {
    color: var(--error-color);
}

.divider {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 1.5rem 0;
    position: relative;
}

.divider::before, .divider::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background-color: var(--border-color);
}

.divider::before { left: 0; }
.divider::after { right: 0; }

/* Toggle Switch */
.toggle-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
}

.toggle-group label {
    margin-bottom: 0;
    color: var(--text-secondary);
    font-weight: 500;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Result Card */
.result-card {
    border: 1px solid var(--accent-glow);
    background: linear-gradient(145deg, #1e1e1e, #181818);
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.result-item {
    background-color: #2c2c2c;
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
}

.result-item .label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.result-item .value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.highlight-item {
    background-color: rgba(0, 230, 118, 0.1);
    border: 1px solid var(--accent-glow);
}

.highlight-item .value {
    color: var(--accent-color);
}

.split-result {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px dashed var(--border-color);
    text-align: center;
}

.split-result h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.cost-per-person {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

@media (max-width: 480px) {
    .container {
        padding: 0;
    }
    body {
        padding: 0.5rem;
    }
    header h1 {
        font-size: 2rem;
    }
    .result-grid {
        grid-template-columns: 1fr;
    }
}