:root {
    --ink: #152033;
    --muted: #69758a;
    --line: #dfe5ee;
    --soft: #f4f7fb;
    --brand: #0f766e;
    --brand-dark: #115e59;
    --accent: #2563eb;
    --danger: #dc2626;
    --warning: #b45309;
    --success: #15803d;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--soft);
    color: var(--ink);
    font-family: Inter, Segoe UI, Arial, sans-serif;
}

a {
    color: inherit;
    text-decoration: none;
}

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background: linear-gradient(135deg, #ecfeff 0%, #f8fafc 48%, #eef2ff 100%);
}

.login-panel {
    width: min(960px, 100%);
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 28px;
    align-items: center;
}

.brand-mark,
.app-brand span {
    width: 48px;
    height: 48px;
    display: inline-grid;
    place-items: center;
    background: var(--brand);
    color: #fff;
    border-radius: 8px;
    font-weight: 800;
}

.login-panel h1 {
    font-size: 52px;
    margin: 18px 0 10px;
}

.login-panel p {
    max-width: 560px;
    color: var(--muted);
    font-size: 18px;
    line-height: 1.6;
}

.login-card,
.panel,
.stat-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
}

.login-card {
    padding: 28px;
}

.login-card h2 {
    margin: 0 0 18px;
}

.hint {
    text-align: center;
    font-size: 13px;
    margin: 14px 0 0;
    color: var(--muted);
}

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 280px 1fr;
    transition: grid-template-columns .2s ease;
}

.app-shell.sidebar-collapsed {
    grid-template-columns: 76px 1fr;
}

.sidebar {
    background: #111827;
    color: #dbe4f0;
    padding: 18px 14px;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    transition: width .2s ease, transform .2s ease, padding .2s ease;
    z-index: 30;
}

.sidebar-head {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: space-between;
    margin-bottom: 22px;
}

.app-brand {
    display: flex;
    gap: 12px;
    align-items: center;
    padding: 4px;
    min-width: 0;
}

.app-brand strong {
    white-space: nowrap;
}

.app-brand span {
    width: 38px;
    height: 38px;
    flex: 0 0 38px;
}

.sidebar-close {
    border: 1px solid rgba(148, 163, 184, 0.25);
    background: rgba(255, 255, 255, 0.05);
    color: #dbe4f0;
    border-radius: 6px;
    padding: 8px 10px;
    cursor: pointer;
    font-weight: 800;
    font-size: 12px;
}

.sidebar-close:hover {
    background: rgba(255, 255, 255, 0.11);
}

.sidebar-backdrop {
    display: none;
}

.slide-nav {
    display: grid;
    gap: 8px;
}

.nav-group {
    border: 1px solid rgba(148, 163, 184, 0.14);
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.22);
    overflow: hidden;
}

.nav-toggle {
    width: 100%;
    border: 0;
    background: transparent;
    color: #dbe4f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 11px 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 800;
    text-align: left;
    text-transform: uppercase;
    letter-spacing: 0;
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

.nav-chevron {
    width: 20px;
    height: 20px;
    display: inline-grid;
    place-items: center;
    transition: transform .2s ease;
    font-size: 20px;
    line-height: 1;
}

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

.nav-panel {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height .25s ease, opacity .2s ease, padding .2s ease;
    padding: 0 8px;
}

.nav-group.open .nav-panel {
    max-height: 560px;
    opacity: 1;
    padding: 0 8px 8px;
}

.sidebar nav a {
    display: block;
    padding: 10px 12px;
    border-radius: 6px;
    margin-bottom: 4px;
    color: #cbd5e1;
    font-size: 14px;
}

.app-shell.sidebar-collapsed .sidebar {
    padding: 18px 10px;
}

.app-shell.sidebar-collapsed .app-brand {
    justify-content: center;
}

.app-shell.sidebar-collapsed .app-brand strong,
.app-shell.sidebar-collapsed .sidebar-close,
.app-shell.sidebar-collapsed .nav-panel,
.app-shell.sidebar-collapsed .nav-toggle span:first-child {
    display: none;
}

.app-shell.sidebar-collapsed .sidebar-head {
    justify-content: center;
}

.app-shell.sidebar-collapsed .slide-nav {
    margin-top: 18px;
}

.app-shell.sidebar-collapsed .nav-group {
    border-radius: 8px;
}

.app-shell.sidebar-collapsed .nav-toggle {
    justify-content: center;
    padding: 12px 8px;
}

.app-shell.sidebar-collapsed .nav-chevron {
    transform: none;
}

.sidebar nav a:hover,
.sidebar nav a.active {
    background: #1f3b47;
    color: #fff;
}

.content {
    padding: 22px;
    min-width: 0;
}

.topbar {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.topbar h1 {
    margin: 0;
    font-size: 24px;
}

.topbar span {
    color: var(--muted);
    font-size: 13px;
}

.user-chip {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 9px 12px;
}

.user-chip a {
    color: var(--danger);
    font-weight: 700;
}

.icon-btn {
    display: none;
}

.app-shell.sidebar-collapsed .icon-btn {
    display: inline-flex;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.stat-card {
    padding: 18px;
}

.stat-card span {
    display: block;
    color: var(--muted);
    font-size: 13px;
    margin-bottom: 8px;
}

.stat-card strong {
    font-size: 28px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.panel {
    padding: 18px;
    margin-bottom: 16px;
}

.panel-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.panel-heading h2 {
    margin: 0;
    font-size: 18px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.span-2,
.form-actions {
    grid-column: 1 / -1;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
}

.table-actions {
    white-space: nowrap;
}

.table-actions .btn {
    margin-left: 6px;
}

.badge {
    display: inline-block;
    padding: 5px 9px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}

.text-bg-success {
    background: #dcfce7;
    color: var(--success);
}

.text-bg-secondary {
    background: #e5e7eb;
    color: #374151;
}

.alert {
    border-radius: 8px;
    padding: 12px 14px;
    margin-bottom: 16px;
    border: 1px solid transparent;
}

.alert-success {
    background: #ecfdf5;
    border-color: #bbf7d0;
    color: #166534;
}

.alert-warning {
    background: #fffbeb;
    border-color: #fde68a;
    color: var(--warning);
}

.alert-danger {
    background: #fef2f2;
    border-color: #fecaca;
    color: var(--danger);
}

@media (max-width: 980px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .app-shell.sidebar-collapsed {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        z-index: 20;
        transform: translateX(-100%);
        transition: transform .2s ease;
        width: min(320px, 86vw);
        max-width: 86vw;
        box-shadow: 24px 0 50px rgba(15, 23, 42, 0.28);
    }

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

    .app-shell.sidebar-collapsed .sidebar {
        padding: 18px 14px;
    }

    .app-shell.sidebar-collapsed .app-brand {
        justify-content: flex-start;
    }

    .app-shell.sidebar-collapsed .app-brand strong,
    .app-shell.sidebar-collapsed .sidebar-close,
    .app-shell.sidebar-collapsed .nav-panel,
    .app-shell.sidebar-collapsed .nav-toggle span:first-child {
        display: initial;
    }

    .app-shell.sidebar-collapsed .sidebar-close {
        display: inline-flex;
    }

    .app-shell.sidebar-collapsed .sidebar-head {
        justify-content: space-between;
    }

    .app-shell.sidebar-collapsed .slide-nav {
        margin-top: 0;
    }

    .app-shell.sidebar-collapsed .nav-toggle {
        justify-content: space-between;
        padding: 11px 12px;
    }

    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        z-index: 15;
        border: 0;
        background: rgba(15, 23, 42, 0.38);
        padding: 0;
    }

    .sidebar.open + .sidebar-backdrop {
        display: block;
    }

    .icon-btn {
        display: inline-flex;
    }

    .stats-grid,
    .grid-2,
    .login-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 680px) {
    .content {
        padding: 14px;
    }

    .topbar {
        align-items: flex-start;
    }

    .topbar h1 {
        font-size: 20px;
    }

    .user-chip {
        flex-direction: column;
        align-items: flex-end;
        gap: 2px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .login-panel h1 {
        font-size: 36px;
    }
}