* {
    box-sizing: border-box;
}

body {
    background: var(--app-bg);
    color: var(--app-text);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
    margin: 0;
}

a {
    color: var(--app-accent);
}

.topbar {
    align-items: center;
    background: var(--app-topbar-bg);
    border-bottom: 1px solid var(--app-border);
    display: flex;
    justify-content: space-between;
    min-height: 4rem;
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

.brand {
    color: var(--app-accent);
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
}

.top-actions {
    align-items: center;
    display: flex;
    gap: 1rem;
}

.top-link {
    border: 1px solid var(--app-border);
    border-radius: 999px;
    padding: 0.35rem 0.75rem;
    text-decoration: none;
}

.layout {
    display: grid;
    grid-template-columns: 16rem minmax(0, 1fr);
    min-height: calc(100vh - 4rem);
}

.sidebar {
    border-right: 1px solid var(--app-border);
    padding: 1rem;
}

.menu h2 {
    color: var(--app-muted);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    margin: 1rem 0 0.4rem;
    text-transform: uppercase;
}

.menu ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.menu a {
    border-radius: 0.75rem;
    display: block;
    padding: 0.5rem 0.65rem;
    text-decoration: none;
}

.menu a:hover {
    background: color-mix(in srgb, var(--app-accent) 12%, transparent);
}

.content {
    padding: 2rem;
}

.app-card {
    background: var(--app-card-bg);
    border: 1px solid var(--app-border);
    border-radius: 1rem;
    margin: 0 auto;
    max-width: 58rem;
    padding: 2rem;
    width: 100%;
}

.login-card {
    max-width: 44rem;
}

.app-form {
    display: grid;
    gap: 1rem;
}

.app-form label {
    display: grid;
    gap: 0.35rem;
}

input,
select,
button {
    border: 1px solid var(--app-border);
    border-radius: 0.75rem;
    color: var(--app-text);
    font: inherit;
    padding: 0.75rem;
}

input,
select {
    background: var(--app-input-bg);
}

button {
    background: var(--app-accent);
    color: #ffffff;
    cursor: pointer;
    font-weight: 700;
}

.notice {
    background: color-mix(in srgb, var(--app-accent) 14%, transparent);
    border: 1px solid var(--app-border);
    border-radius: 0.75rem;
    padding: 0.75rem;
}

.field-help {
    color: var(--app-muted);
}

.settings-grid,
.settings-tabs {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
    margin-top: 1rem;
}

.copy-block {
    background: #0f172a;
    border-radius: 0.75rem;
    color: #f8fafc;
    overflow-x: auto;
    padding: 1rem;
    white-space: pre-wrap;
}

.checklist li {
    margin-bottom: 0.5rem;
}

@media (max-width: 760px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-bottom: 1px solid var(--app-border);
        border-right: 0;
    }

    .content {
        padding: 1rem;
    }
}