:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-bg: #f4f5f9;
    --color-surface: #ffffff;
    --color-text: #1f2937;
    --color-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-success: #16a34a;
    --color-warning: #d97706;
    --color-error: #dc2626;
    --radius: 14px;
    --shadow: 0 6px 20px rgba(17, 24, 39, 0.06);
    --sidebar-width: 230px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
}

a { color: var(--color-primary); }

/* ---------- Layout ---------- */
.layout { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-width);
    background: #111827;
    color: #e5e7eb;
    display: flex;
    flex-direction: column;
    padding: 20px 16px;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 26px;
    padding: 0 4px;
}
.brand-dot { width: 12px; height: 12px; border-radius: 50%; background: linear-gradient(135deg, #818cf8, #4f46e5); }

.menu { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.menu a {
    color: #cbd5e1;
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 0.92rem;
    font-weight: 500;
}
.menu a:hover { background: rgba(255,255,255,0.06); color: #fff; }
.menu a.active { background: var(--color-primary); color: #fff; }

.sidebar-footer { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 14px; font-size: 0.85rem; }
.admin-name { color: #e5e7eb; margin-bottom: 6px; }
.logout-link { color: #f87171; text-decoration: none; font-weight: 600; }

.content { flex: 1; min-width: 0; }

.topbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.topbar h1 { font-size: 1.2rem; margin: 0; }
.menu-toggle { display: none; background: none; border: none; font-size: 1.3rem; cursor: pointer; }

.content-inner { padding: 24px; max-width: 1200px; }

/* ---------- Stat cards ---------- */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}
.stat-grid-3 { grid-template-columns: repeat(3, 1fr); }

.stat-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px 20px;
    border-left: 4px solid var(--color-primary);
}
.stat-card.stat-warn { border-left-color: var(--color-warning); }
.stat-card.stat-good { border-left-color: var(--color-success); }
.stat-card.stat-accent { border-left-color: #0ea5e9; }

.stat-label { display: block; font-size: 0.82rem; color: var(--color-muted); margin-bottom: 6px; }
.stat-value { display: block; font-size: 1.7rem; font-weight: 800; }

/* ---------- Panels ---------- */
.panel {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 22px;
}
.panel-narrow { max-width: 560px; }
.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.panel-header h2 { font-size: 1.05rem; margin: 0; }
.panel-actions { display: flex; gap: 8px; }

/* ---------- Forms ---------- */
.form { display: flex; flex-direction: column; gap: 14px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 0.88rem; font-weight: 600; color: var(--color-text); }
.form input, .form select, .form textarea {
    font-size: 0.95rem;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    font-family: inherit;
    background: #fff;
}
.form input:focus, .form select:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.hint { font-size: 0.82rem; color: var(--color-muted); margin: 0; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.checkbox-inline { display: flex !important; flex-direction: row !important; align-items: center; gap: 8px; font-weight: 500 !important; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    border: none;
    border-radius: 10px;
    padding: 11px 18px;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background .15s ease, transform .1s ease;
}
.btn:active { transform: scale(0.98); }
.btn-block { display: block; width: 100%; }
.btn-sm { padding: 7px 12px; font-size: 0.82rem; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-secondary { background: #f1f5f9; color: var(--color-text); }
.btn-secondary:hover { background: #e2e8f0; }
.btn-ghost { background: transparent; color: var(--color-primary); }

/* ---------- Alerts ---------- */
.alert { padding: 12px 14px; border-radius: 10px; font-size: 0.9rem; margin-bottom: 16px; }
.alert-error { background: #fef2f2; color: var(--color-error); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--color-success); border: 1px solid #bbf7d0; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.table th, .table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--color-border); }
.table th { color: var(--color-muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; }
.table tr:hover td { background: #fafbff; }
.table .empty { text-align: center; color: var(--color-muted); padding: 24px; }
.table code { background: #f1f5f9; padding: 2px 6px; border-radius: 6px; font-size: 0.82rem; }
.row-actions a { margin-right: 10px; font-size: 0.85rem; text-decoration: none; }
.truncate { max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- Badges ---------- */
.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 700; }
.badge-used { background: #f0fdf4; color: var(--color-success); }
.badge-unused { background: #fffbeb; color: var(--color-warning); }

/* ---------- Filter bar / toolbar ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 18px; }
.filter-bar select, .filter-bar input { padding: 9px 10px; border: 1px solid var(--color-border); border-radius: 10px; font-size: 0.88rem; }
.table-toolbar { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }

/* ---------- Pagination ---------- */
.pagination { display: flex; gap: 6px; margin-top: 16px; flex-wrap: wrap; }
.pagination a { padding: 7px 12px; border-radius: 8px; background: #f1f5f9; text-decoration: none; color: var(--color-text); font-size: 0.85rem; }
.pagination a.active { background: var(--color-primary); color: #fff; }

/* ---------- Result actions / preview stats ---------- */
.result-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.preview-stats { margin-top: 20px; }
.preview-stats h3 { font-size: 0.95rem; margin-bottom: 10px; }

/* ---------- Login page ---------- */
.login-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(160deg, #eef2ff, #f4f5f9 60%);
    padding: 20px;
}
.login-card {
    width: 100%;
    max-width: 380px;
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px 28px;
}
.login-brand { display: flex; align-items: center; gap: 10px; }
.login-brand h1 { font-size: 1.25rem; margin: 0; }
.login-sub { color: var(--color-muted); margin: 6px 0 20px; font-size: 0.9rem; }
.login-form { display: flex; flex-direction: column; gap: 14px; }
.login-form label { display: flex; flex-direction: column; gap: 6px; font-size: 0.85rem; font-weight: 600; }
.login-form input {
    padding: 11px 12px; border: 1px solid var(--color-border); border-radius: 10px; font-size: 0.95rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .stat-grid, .stat-grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
    .menu-toggle { display: block; }
    .sidebar {
        position: fixed;
        left: -260px;
        z-index: 40;
        transition: left .2s ease;
        box-shadow: 0 0 30px rgba(0,0,0,0.3);
    }
    .sidebar.open { left: 0; }
    .content-inner { padding: 16px; }
    .stat-grid, .stat-grid-3, .grid-4 { grid-template-columns: 1fr; }
}