* {
    box-sizing: border-box;
}

:root {
    --sidebar-width: 288px;
    --sidebar-collapsed-width: 92px;
    --topbar-height: 72px;
    --color-bg: #f3f5f8;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #111827;
    --color-muted: #6b7280;
    --color-sidebar: #09152f;
    --color-sidebar-text: #dbe4f0;
    --color-sidebar-muted: rgba(219, 228, 240, 0.55);
    --color-primary: #2563eb;
    --shadow-soft: 0 6px 18px rgba(15, 23, 42, 0.06);
}

html, body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    font-family: Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
}

body {
    min-height: 100vh;
}

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

svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

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

.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #081226 0%, #0b1733 100%);
    color: var(--color-sidebar-text);
    overflow-y: auto;
    padding: 18px 16px 24px;
    z-index: 1100;
    transition: width 0.25s ease, transform 0.25s ease;
    border-right: 1px solid rgba(255,255,255,0.05);
}

.sidebar-brand {
    padding: 4px 6px 18px;
    margin-bottom: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-brand-name {
    font-size: 18px;
    font-weight: bold;
    color: #ffffff;
}

.sidebar-brand-instance {
    margin-top: 6px;
    font-size: 13px;
    color: var(--color-sidebar-muted);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.sidebar-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-group-title {
    font-size: 11px;
    font-weight: bold;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-sidebar-muted);
    padding: 0 10px;
}

.sidebar-group-items {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 44px;
    padding: 10px 12px;
    border-radius: 12px;
    color: var(--color-sidebar-text);
    transition: background 0.2s ease, color 0.2s ease;
}

.sidebar-link:hover {
    background: rgba(255,255,255,0.06);
}

.sidebar-link.active {
    background: rgba(255,255,255,0.10);
    color: #ffffff;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06);
}

.ui-icon {
    width: 20px;
    min-width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.sidebar-link-text {
    line-height: 1.2;
}

.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.25s ease;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--topbar-height);
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 0 20px;
}

.topbar-left,
.topbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.topbar-title-wrap {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.topbar-title {
    margin: 0;
    font-size: 18px;
    line-height: 1.1;
}

.topbar-subtitle {
    font-size: 12px;
    color: var(--color-muted);
}

.topbar-btn,
.topbar-icon-btn,
.topbar-logout {
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    background: #fff;
    color: var(--color-text);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 12px;
    cursor: pointer;
}

.topbar-btn:hover,
.topbar-icon-btn:hover,
.topbar-logout:hover {
    background: #f9fafb;
}

.topbar-chip,
.topbar-user {
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    background: #fff;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    color: var(--color-text);
}

.topbar-user-name {
    max-width: 180px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.counter {
    min-width: 18px;
    height: 18px;
    border-radius: 999px;
    background: var(--color-primary);
    color: #fff;
    font-size: 11px;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 5px;
}

.app-content {
    padding: 20px;
}

.page-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.page-heading h2 {
    margin: 0 0 8px 0;
    font-size: 28px;
}

.page-heading p {
    margin: 0;
    color: var(--color-muted);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 18px;
    box-shadow: var(--shadow-soft);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 12px;
}

.card p {
    margin: 0 0 8px 0;
}

.placeholder-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
}

.meta-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 10px;
    border-radius: 999px;
    background: #eef2ff;
    color: #3730a3;
    font-size: 12px;
    font-weight: bold;
}

.footer {
    margin-top: auto;
    padding: 14px 20px;
    font-size: 12px;
    color: var(--color-muted);
    border-top: 1px solid var(--color-border);
    background: #ffffff;
}

.sidebar-overlay {
    display: none;
}

.desktop-only {
    display: inline-flex;
}

.mobile-only {
    display: none;
}

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

body.sidebar-collapsed .app-main {
    margin-left: var(--sidebar-collapsed-width);
}

body.sidebar-collapsed .sidebar-brand-instance,
body.sidebar-collapsed .sidebar-group-title,
body.sidebar-collapsed .sidebar-link-text {
    display: none;
}

body.sidebar-collapsed .sidebar-link {
    justify-content: center;
    padding-left: 10px;
    padding-right: 10px;
}

body.sidebar-collapsed .sidebar-brand {
    display: flex;
    justify-content: center;
    align-items: center;
}

body.sidebar-collapsed .sidebar-brand-name {
    font-size: 16px;
}

@media (max-width: 1100px) {
    .topbar-chip span,
    .topbar-user-name,
    .topbar-logout span {
        display: none;
    }

    .topbar-chip,
    .topbar-user,
    .topbar-logout,
    .topbar-icon-btn {
        width: 40px;
        padding: 0;
    }
}

@media (max-width: 991px) {
    .card-grid {
        grid-template-columns: 1fr;
    }

    .mobile-only {
        display: inline-flex;
    }

    .desktop-only {
        display: none;
    }

    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width);
    }

    .app-main {
        margin-left: 0 !important;
    }

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

    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, 0.45);
        z-index: 1050;
    }

    body.sidebar-open .sidebar-overlay {
        display: block;
    }

    .topbar {
        padding: 0 14px;
    }

    .app-content {
        padding: 14px;
    }

    .topbar-right {
        gap: 8px;
    }

    .topbar-title {
        font-size: 17px;
    }

    .page-heading h2 {
        font-size: 22px;
    }
}

@media (max-width: 640px) {
    .topbar {
        gap: 10px;
    }

    .topbar-right {
        gap: 6px;
    }

    .topbar-btn,
    .topbar-icon-btn,
    .topbar-chip,
    .topbar-user,
    .topbar-logout {
        height: 38px;
    }

    .app-content {
        padding: 12px;
    }

    .card {
        padding: 16px;
    }
}