:root {
    --primary: #2563eb;
    --secondary: #0f172a;
    --bg: #f4f7fb;
    --card: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --border: #e5e7eb;
    --danger: #dc2626;
    --success: #16a34a;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.hidden {
    display: none !important;
}

.workspace-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    background:
        radial-gradient(circle at top left, rgba(37, 99, 235, 0.18), transparent 30%),
        linear-gradient(135deg, #0f172a, #1e293b);
}

.workspace-card {
    width: min(950px, 100%);
    background: #ffffff;
    border-radius: 24px;
    padding: 35px;
    box-shadow: 0 30px 70px rgba(0,0,0,0.25);
}

.workspace-card h1 {
    margin-top: 0;
    font-size: 34px;
}

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

.sidebar {
    width: 280px;
    background: var(--secondary);
    color: #fff;
    padding: 24px;
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0 auto 0 0;
}

.brand-box {
    display: flex;
    gap: 14px;
    align-items: center;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.12);
    margin-bottom: 18px;
}

.logo-wrap {
    width: 52px;
    height: 52px;
    background: var(--primary);
    border-radius: 16px;
    display: grid;
    place-items: center;
    overflow: hidden;
    font-weight: bold;
    font-size: 22px;
}

.logo-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
}

.brand-box h2 {
    margin: 0;
    font-size: 18px;
    line-height: 1.2;
}

.brand-box small {
    color: rgba(255,255,255,0.65);
}

nav {
    display: grid;
    gap: 8px;
}

.nav-btn,
.switch-btn {
    width: 100%;
    border: 0;
    border-radius: 12px;
    padding: 13px 14px;
    cursor: pointer;
    text-align: left;
    background: transparent;
    color: rgba(255,255,255,0.8);
    font-size: 15px;
}

.nav-btn:hover,
.nav-btn.active {
    background: var(--primary);
    color: #ffffff;
}

.switch-btn {
    margin-top: auto;
    background: rgba(255,255,255,0.08);
    text-align: center;
}

.main {
    flex: 1;
    margin-left: 280px;
    padding: 28px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: center;
    margin-bottom: 25px;
}

.topbar h1 {
    margin: 0;
    font-size: 30px;
}

.topbar p {
    margin: 6px 0 0;
    color: var(--muted);
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.grid {
    display: grid;
    gap: 22px;
}

.grid.two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    margin-bottom: 22px;
}

.stat-card,
.panel {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
}

.stat-card {
    padding: 22px;
}

.stat-card span {
    color: var(--muted);
    display: block;
    margin-bottom: 10px;
}

.stat-card strong {
    font-size: 30px;
}

.panel {
    padding: 22px;
    margin-bottom: 22px;
}

.panel h2 {
    margin-top: 0;
}

.panel-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

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

input,
select,
textarea {
    width: 100%;
    padding: 12px 13px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 14px;
    background: #fff;
}

textarea {
    min-height: 46px;
    resize: vertical;
}

button {
    background: var(--primary);
    color: white;
    border: 0;
    border-radius: 12px;
    padding: 12px 16px;
    cursor: pointer;
    font-weight: 700;
}

button:hover {
    filter: brightness(0.95);
}

.delete-btn {
    background: var(--danger);
    padding: 8px 11px;
    font-size: 12px;
}

.table-wrap {
    width: 100%;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 760px;
}

th,
td {
    padding: 13px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

th {
    color: var(--muted);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge {
    display: inline-block;
    padding: 5px 9px;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.12);
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
}

.list-item {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
}

.list-item:last-child {
    border-bottom: 0;
}

.list-item strong {
    display: block;
}

.list-item small {
    color: var(--muted);
}

#toast {
    position: fixed;
    right: 22px;
    bottom: 22px;
    background: #111827;
    color: white;
    padding: 14px 18px;
    border-radius: 14px;
    box-shadow: 0 18px 40px rgba(0,0,0,0.22);
    display: none;
    z-index: 50;
}

@media (max-width: 1000px) {
    .sidebar {
        position: static;
        width: 100%;
    }

    .app-shell {
        display: block;
    }

    .main {
        margin-left: 0;
    }

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

    .topbar {
        display: block;
    }
}