:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    --secondary: #6b7280;
    --bg: #f9fafb;
    --card-bg: #ffffff;
    --border: #e5e7eb;
    --text: #111827;
    --text-muted: #6b7280;
    --success-bg: #d1fae5;
    --success-text: #065f46;
    --error-bg: #fee2e2;
    --error-text: #991b1b;
    --radius: 8px;
}

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

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

/* ---- Navbar ---- */
.navbar {
    background: #1e293b;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.nav-links { display: flex; gap: 4px; }

.nav-link {
    color: #94a3b8;
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: color 0.15s, background 0.15s;
}

.nav-link:hover { color: #fff; background: rgba(255,255,255,0.08); }

/* ---- Container ---- */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 24px;
}

/* ---- Page Header ---- */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
}

/* ---- Card ---- */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}

/* ---- Forms ---- */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    color: var(--text);
    background: #fff;
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

select.form-control { cursor: pointer; }

.input-with-button {
    display: flex;
    gap: 8px;
}

.input-with-button .form-control { flex: 1; }

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 18px;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, opacity 0.15s;
    white-space: nowrap;
}

.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }

.btn-secondary { background: #f3f4f6; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover:not(:disabled) { background: #e5e7eb; }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: var(--danger-dark); }

.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { color: var(--text); background: #f3f4f6; }

.btn-sm { padding: 5px 12px; font-size: 0.8rem; }

/* ---- Validation ---- */
.validation-error { display: block; color: var(--danger); font-size: 0.8rem; margin-top: 4px; }

/* ---- Fetch status ---- */
.fetch-status {
    font-size: 0.82rem;
    margin-top: 6px;
    padding: 5px 10px;
    border-radius: 4px;
}

.fetch-status.hidden { display: none; }
.status-info { background: #eff6ff; color: #1d4ed8; }
.status-success { background: var(--success-bg); color: var(--success-text); }
.status-error { background: var(--error-bg); color: var(--error-text); }

/* ---- Alerts ---- */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.alert-success { background: var(--success-bg); color: var(--success-text); border: 1px solid #6ee7b7; }
.alert-error { background: var(--error-bg); color: var(--error-text); border: 1px solid #fca5a5; }

/* ---- Filters ---- */
.filters { margin-bottom: 20px; }

.filter-form {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    flex-wrap: wrap;
}

.form-group-inline {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 160px;
}

.form-group-inline label { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); }
.form-group-inline .form-control { padding: 7px 10px; }

/* ---- Links table ---- */
.results-info { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 12px; }

.category-section { margin-bottom: 32px; }

.category-heading {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 2px solid #dbeafe;
}

.links-table-wrapper {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.links-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.links-table thead { background: #f8fafc; }

.links-table th {
    padding: 10px 14px;
    text-align: left;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border);
}

.links-table td {
    padding: 10px 14px;
    border-bottom: 1px solid #f3f4f6;
    vertical-align: middle;
}

.links-table tbody tr:last-child td { border-bottom: none; }
.links-table tbody tr:hover { background: #f8fafc; }

.title-cell { font-weight: 500; max-width: 280px; }
.url-cell { max-width: 300px; }

.url-link {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.85rem;
    word-break: break-all;
}

.url-link:hover { text-decoration: underline; }

.date-cell { color: var(--text-muted); font-size: 0.82rem; white-space: nowrap; }
.actions-cell { white-space: nowrap; }

/* ---- Empty state ---- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state a { color: var(--primary); }

/* ---- Danger zone ---- */
.danger-zone {
    border-color: #fecaca;
    background: #fff5f5;
}

.danger-zone h3 { color: var(--danger); margin-bottom: 8px; font-size: 1rem; }
.danger-zone p { color: var(--text-muted); font-size: 0.875rem; margin-bottom: 14px; }

/* ---- Misc ---- */
.text-muted { color: var(--text-muted); font-size: 0.82rem; }

.hidden { display: none !important; }

.spinner {
    width: 14px;
    height: 14px;
    border: 2px solid rgba(0,0,0,0.2);
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
}

@keyframes spin { to { transform: rotate(360deg); } }