:root {
    --bg: #f4f5f7;
    --fg: #1c1f26;
    --card-bg: #ffffff;
    --border: #dde1e6;
    --accent: #2563eb;
    --muted: #6b7280;
}

[data-theme="dark"] {
    --bg: #14161c;
    --fg: #e6e8ec;
    --card-bg: #1d2029;
    --border: #2c3140;
    --accent: #5b8def;
    --muted: #9aa1ae;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a {
    color: var(--accent);
    text-decoration: none;
}

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

.sidebar {
    width: 220px;
    flex-shrink: 0;
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1rem;
}

.brand {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.nav a {
    color: var(--fg);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
}

.nav a:hover {
    background: var(--bg);
}

.sidebar-footer {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    border-top: 1px solid var(--border);
    padding-top: 0.75rem;
}

.sidebar-footer button {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--fg);
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    cursor: pointer;
}

.user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--muted);
}

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

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.card h2 {
    margin-top: 0;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    text-align: left;
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.empty {
    color: var(--muted);
    font-style: italic;
}

form label {
    display: block;
    margin-bottom: 0.75rem;
}

input, select, button {
    font: inherit;
}

input[type="text"], input[type="password"], input[type="email"], input[type="number"], select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--fg);
}

button[type="submit"] {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    cursor: pointer;
}

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.login-card {
    width: 100%;
    max-width: 360px;
}

.login-card .brand {
    text-align: center;
    font-size: 1.4rem;
    margin-bottom: 0.25rem;
}

.login-card .subtitle {
    text-align: center;
    color: var(--muted);
    margin: 0 0 1.5rem;
    font-size: 0.9rem;
}

.login-card label {
    display: block;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.login-card label span {
    display: block;
    margin-bottom: 0.35rem;
}

.login-card button[type="submit"] {
    width: 100%;
    margin-top: 0.25rem;
}

.login-error {
    background: rgba(220, 38, 38, 0.12);
    border: 1px solid rgba(220, 38, 38, 0.4);
    color: #dc2626;
    padding: 0.6rem 0.75rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .app {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        flex-direction: row;
        align-items: center;
        border-right: none;
        border-bottom: 1px solid var(--border);
        flex-wrap: wrap;
    }

    .brand {
        margin-bottom: 0;
        margin-right: 1rem;
    }

    .nav {
        flex-direction: row;
        flex: 1;
    }

    .sidebar-footer {
        border-top: none;
        flex-direction: row;
    }

    table, thead, tbody, th, td, tr {
        display: block;
    }

    thead {
        display: none;
    }

    tr {
        border-bottom: 1px solid var(--border);
        padding: 0.5rem 0;
    }

    td {
        border-bottom: none;
        padding: 0.25rem 0;
    }

    td::before {
        content: attr(data-label);
        font-weight: 600;
        display: inline-block;
        min-width: 40%;
        color: var(--muted);
    }
}