:root {
    --sidebar-width: 260px;
    --sidebar-width-collapsed: 72px;
    --color-bg: #f4f6f9;
    --color-surface: #ffffff;
    --color-sidebar: #101f35;
    --color-sidebar-hover: #1a324f;
    --color-accent: #1c3a5e;
    --color-accent-light: #8fb3d9;
    --color-text: #17233a;
    --color-text-muted: #6b7789;
    --color-border: #e2e6ed;
    --color-danger: #b3261e;
    --color-success: #2e6b3e;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
}

a { color: inherit; }

.app {
    display: flex;
    min-height: 100vh;
}

/* ---------- Sidebar ---------- */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: var(--color-sidebar);
    color: #f2f1ee;
    display: flex;
    flex-direction: column;
    transition: width 0.2s ease;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.app.is-collapsed .sidebar {
    width: var(--sidebar-width-collapsed);
}

.sidebar-brand {
    padding: 1.5rem 1.25rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.brand-mark {
    font-weight: 800;
    letter-spacing: 0.14em;
    font-size: 1.1rem;
    color: #ffffff;
}

.brand-sub {
    font-size: 0.7rem;
    color: var(--color-accent-light);
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.app.is-collapsed .brand-sub,
.app.is-collapsed .nav-link span:first-child,
.app.is-collapsed .chevron,
.app.is-collapsed .user-chip,
.app.is-collapsed .logout-link {
    display: none;
}

.app.is-collapsed .brand-mark {
    font-size: 0.7rem;
}

.nav {
    flex: 1;
    padding: 0.75rem 0;
}

.nav-list, .nav-sub {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item { position: relative; }

.nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    width: 100%;
    padding: 0.65rem 1.25rem;
    background: none;
    border: none;
    color: rgba(255,255,255,0.85);
    font-size: 0.9rem;
    text-decoration: none;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
}

.nav-link:hover {
    background: var(--color-sidebar-hover);
    color: #fff;
}

.nav-item.is-active > .nav-link,
.nav-item.is-active > .nav-toggle {
    color: #ffffff;
    background: var(--color-sidebar-hover);
    border-left: 3px solid var(--color-accent-light);
    padding-left: calc(1.25rem - 3px);
}

.nav-sub {
    max-height: 0;
    overflow: hidden;
    background: rgba(0,0,0,0.18);
    transition: max-height 0.2s ease;
}

.nav-sub.is-open {
    max-height: 600px;
}

.nav-sub .nav-link {
    padding-left: 2.25rem;
    font-size: 0.85rem;
}

.chevron {
    transition: transform 0.2s ease;
    font-size: 1.1rem;
    color: rgba(255,255,255,0.4);
}

.nav-item.is-active > .nav-toggle .chevron,
.nav-toggle:has(+ .nav-sub.is-open) .chevron {
    transform: rotate(90deg);
}

.sidebar-footer {
    padding: 1rem 1.25rem 1.25rem;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.user-chip {
    display: flex;
    flex-direction: column;
    margin-bottom: 0.5rem;
}

.user-name {
    font-size: 0.85rem;
    font-weight: 600;
}

.user-email {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.5);
}

.logout-link {
    font-size: 0.8rem;
    color: var(--color-accent-light);
    text-decoration: none;
}

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

/* ---------- Content ---------- */
.content-area {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.topbar {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.9rem 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    box-shadow: 0 4px 18px rgba(16, 31, 53, 0.08);
    position: sticky;
    top: 1.25rem;
    z-index: 5;
    margin: 1.25rem 1.5rem 0;
}

.sidebar-toggle {
    width: 36px;
    height: 36px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    border-radius: 999px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
}

.sidebar-toggle span {
    width: 16px;
    height: 2px;
    background: var(--color-text);
    display: block;
}

.page-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0;
}

.content {
    flex: 1;
    padding: 1.5rem 2rem 2rem;
}

/* ---------- Reusable UI ---------- */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 10px rgba(16, 31, 53, 0.04);
}

.card h2, .card h3 {
    margin-top: 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.stat {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.25rem;
    box-shadow: 0 2px 10px rgba(16, 31, 53, 0.04);
}

.stat .value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-accent);
}

.stat .label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

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

th, td {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

th {
    color: var(--color-text-muted);
    font-weight: 600;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-active { background: #e6f0e8; color: var(--color-success); }
.badge-inactive { background: #eaedf2; color: var(--color-text-muted); }
.badge-danger { background: #fbe7e5; color: var(--color-danger); }

.btn {
    display: inline-block;
    padding: 0.6rem 1.3rem;
    border-radius: 999px;
    border: 1px solid var(--color-accent);
    background: var(--color-accent);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
}

.btn:hover { background: #0f2036; border-color: #0f2036; }

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

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

form.form-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: flex-end;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    margin-bottom: 1rem;
}

.field label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.field input,
.field select,
.field textarea {
    padding: 0.55rem 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    font-size: 0.9rem;
    font-family: inherit;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(28, 58, 94, 0.12);
}

.checkbox-tree ul {
    list-style: none;
    padding-left: 1.25rem;
}

.checkbox-tree > ul { padding-left: 0; }

.checkbox-tree label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.2rem 0;
    font-size: 0.9rem;
}

.flash {
    padding: 0.75rem 1rem;
    border-radius: 10px;
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
}

.flash-success { background: #e6f0e8; color: var(--color-success); }
.flash-error { background: #fbe7e5; color: var(--color-danger); }
.flash-info { background: #eef0f5; color: #34435c; }

.empty-state {
    padding: 2.5rem;
    text-align: center;
    color: var(--color-text-muted);
}

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-sidebar);
}

.login-card {
    background: var(--color-surface);
    border-radius: 24px;
    padding: 2.5rem;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.25);
}

.login-brand {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--color-accent);
    font-weight: 800;
    letter-spacing: 0.14em;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        z-index: 20;
        transform: translateX(0);
    }
    .app.is-collapsed .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width);
    }
    .content { padding: 1.25rem; }
}