/* ── Reset & Tokens ───────────────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #0d1117;
    --surface: #161b27;
    --surface2: #1e2535;
    --border: #2a3347;
    --accent: #3b82f6;
    --accent-h: #60a5fa;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text: #e2e8f0;
    --muted: #8b9ab4;
    --radius: 12px;
    --radius-sm: 6px;
    --sidebar-w: 240px;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
}

/* ── Sidebar ──────────────────────────────────────────────────── */
.sidebar {
    width: var(--sidebar-w);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-brand {
    padding: 28px 20px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.brand-text {
    flex: 1;
}

.brand-badge {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    background: #3b82f615;
    border: 1px solid #3b82f630;
    padding: 3px 8px;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 8px;
}

.brand-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
    line-height: 1.3;
}

.close-sidebar {
    display: none;
    background: none;
    border: none;
    color: var(--muted);
    font-size: 20px;
    cursor: pointer;
}

.sidebar-nav {
    padding: 16px 12px;
    flex: 1;
    overflow-y: auto;
}

/* Nav Groups (Collapsible) */
.nav-group {
    margin-bottom: 4px;
}

.nav-group-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: transparent;
    border: none;
    padding: 10px 12px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all .2s;
    font-family: inherit;
}

.nav-group-btn:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
}

.nav-group-btn.active {
    color: var(--accent-h);
}

.nav-group-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.nav-chevron {
    font-size: 10px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-group.open .nav-chevron {
    transform: rotate(90deg);
}

.nav-sub {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-group.open .nav-sub {
    grid-template-rows: 1fr;
}

.nav-sub-inner {
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding-left: 36px;
    gap: 2px;
    margin-top: 2px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    color: var(--muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: all .2s;
}

.nav-link:hover,
.nav-link.active {
    background: #3b82f615;
    color: var(--accent-h);
}

.nav-link-single {
    padding: 10px 12px;
    font-weight: 600;
    margin-bottom: 4px;
}

/* ── Main content ─────────────────────────────────────────────── */
.main {
    margin-left: var(--sidebar-w);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.topbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 18px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 16px;
    position: relative;
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.user-btn {
    background: #3b82f615;
    border: 1px solid var(--border);
    color: var(--text);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

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

.user-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-top: 8px;
    min-width: 200px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

.user-menu.open {
    display: block;
}

.user-menu-item {
    display: block;
    padding: 10px 16px;
    color: var(--text);
    text-decoration: none;
    font-size: 13px;
    transition: all 0.2s;
}

.user-menu-item:hover {
    background: var(--surface2);
    color: var(--accent);
}

.user-menu-item.danger:hover {
    color: var(--danger);
}

.topbar-sub {
    font-size: 13px;
    color: var(--muted);
    margin-top: 2px;
}

.page-content {
    padding: 32px;
    flex: 1;
}

/* ── Cards ────────────────────────────────────────────────────── */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.card-title {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text);
}

/* ── Stat tiles ───────────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-tile {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}

.stat-label {
    font-size: 12px;
    color: var(--muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: .5px;
}

.stat-value {
    font-size: 32px;
    font-weight: 800;
    margin: 6px 0 4px;
    line-height: 1;
}

.stat-sub {
    font-size: 12px;
    color: var(--muted);
}

/* ── Buttons ──────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    border: none;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all .2s;
}

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

.btn-primary:hover {
    background: var(--accent-h);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}

.btn-outline:hover {
    background: #3b82f615;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 12px;
}

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

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}

.form-hint {
    font-size: 12px;
    color: var(--muted);
    margin-top: 4px;
}

.form-select,
.form-control {
    width: 100%;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    padding: 10px 14px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color .2s;
}

.form-select:focus,
.form-control:focus {
    border-color: var(--accent);
}

.form-select option {
    background: var(--surface2);
}

.form-check {
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-check input[type=checkbox] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
}

.form-error {
    font-size: 12px;
    color: var(--danger);
    margin-top: 4px;
}

.file-drop {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 36px;
    text-align: center;
    cursor: pointer;
    transition: border-color .2s, background .2s;
}

.file-drop:hover {
    border-color: var(--accent);
    background: #3b82f608;
}

.file-drop-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.file-drop p {
    color: var(--muted);
    font-size: 14px;
}

.file-drop strong {
    color: var(--accent);
}

#id_excel_file {
    display: none;
}

/* ── Alerts ───────────────────────────────────────────────────── */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 20px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.alert-success {
    background: #10b98115;
    border: 1px solid #10b98135;
    color: #34d399;
}

.alert-warning {
    background: #f59e0b15;
    border: 1px solid #f59e0b35;
    color: #fbbf24;
}

.alert-danger {
    background: #ef444415;
    border: 1px solid #ef444435;
    color: #f87171;
}

/* ── Tables ───────────────────────────────────────────────────── */
.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

th {
    background: var(--surface2);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

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

tr:hover td {
    background: #ffffff04;
}

/* ── Badges ───────────────────────────────────────────────────── */
.badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
}

.badge-success {
    background: #10b98120;
    color: #34d399;
}

.badge-warning {
    background: #f59e0b20;
    color: #fbbf24;
}

.badge-danger {
    background: #ef444420;
    color: #f87171;
}

.badge-info {
    background: #3b82f620;
    color: #60a5fa;
}

/* ── Divider ──────────────────────────────────────────────────── */
hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 24px 0;
}

/* ── Responsive ───────────────────────────────────────────────── */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 24px;
    cursor: pointer;
    margin-right: 16px;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.5);
    }

    .sidebar.mobile-open {
        transform: translateX(0);
    }

    .close-sidebar {
        display: block;
    }

    .mobile-menu-btn {
        display: block;
    }

    .main {
        margin-left: 0;
    }

    .page-content {
        padding: 20px;
    }

    .topbar {
        padding: 16px 20px;
    }
}