:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #14b8a6; /* Teal */
    --accent-hover: #0d9488;
    --border: #334155;
    --danger: #ef4444;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

a {
    color: var(--text-main);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent);
}

/* Buttons */
.btn {
    background-color: var(--card-bg);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.btn:hover {
    border-color: var(--accent);
}

.btn.active {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-primary {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

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

.btn-danger {
    background-color: transparent;
    border-color: var(--danger);
    color: var(--danger);
}
.btn-danger:hover {
    background-color: var(--danger);
    color: #fff;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    color: var(--text-main);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

/* Layouts */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.button-group {
    display: flex;
    gap: 0.5rem;
}

/* Chart */
.chart-container {
    position: relative;
    height: 60vh;
    width: 100%;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
}

/* Login */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    width: 100%;
    max-width: 400px;
}

.error-msg {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: none;
}

/* Admin Grid */
.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}
@media (min-width: 768px) {
    .grid {
        grid-template-columns: 1fr 1fr;
    }
}

.station-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    margin-bottom: 0.5rem;
}

.skeleton {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(30, 41, 59, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: 0.5rem;
}

/* Focus Indicators */
*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toast {
    background-color: var(--card-bg);
    color: var(--text-main);
    padding: 1rem 1.5rem;
    border-radius: 0.375rem;
    border-left: 4px solid var(--accent);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    animation: slideIn 0.3s ease-out forwards;
}
.toast.error {
    border-left-color: var(--danger);
}
@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Overview Cards */
.overview-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.overview-card {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}
.overview-card.cheapest {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}
.overview-card .station-name {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.overview-card .price {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
}
.overview-card .closed-badge {
    font-size: 0.75rem;
    background-color: var(--danger);
    color: white;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    align-self: flex-start;
    margin-top: 0.5rem;
}

/* Calculator Widget */
.calculator-widget {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    margin-top: 1.5rem;
}
.calculator-results {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.calc-result-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem;
    background-color: var(--bg-color);
    border-radius: 0.25rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}
.modal {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}
.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}