:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    padding: 2rem;
}

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

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.search-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    align-items: end;
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-main);
}

input, select {
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s;
    width: 100%;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
}

#btn-search {
    background-color: var(--primary);
    color: white;
    grid-column: 1 / -1;
}

#btn-search:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-secondary:hover {
    background-color: var(--bg-body);
    color: var(--text-main);
}

/* Results Area */
.hidden {
    display: none;
}

.error-box {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #991b1b;
}

.error-icon {
    font-size: 1.25rem;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-title {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.sort-controls label {
    color: var(--text-muted);
    font-weight: 500;
}

.sort-controls select {
    padding: 0.4rem 0.6rem;
    font-size: 0.85rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
}

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

.divider {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

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

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

.badge {
    background-color: var(--primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.85rem;
}

.table-responsive {
    background: var(--bg-card);
    border-radius: 1rem;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    background-color: #f1f5f9;
    padding: 1rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background-color: #f8fafc;
}

.btn-action {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

.btn-action:hover {
    text-decoration: underline;
}

/* Loading */
#loading {
    text-align: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e2e8f0;
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .search-card {
        grid-template-columns: 1fr;
    }
    
    body {
        padding: 1rem;
    }
}