:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-bg: #f4f5f7;
    --color-text: #1f2937;
    --color-border: #e2e2e2;
    --color-error: #dc2626;
    --sidebar-width: 220px;
}

* { box-sizing: border-box; }

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

.topbar {
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar__brand { font-weight: 700; font-size: 18px; }
.topbar__nav { display: flex; align-items: center; gap: 16px; }
.topbar__nav a { color: var(--color-primary); text-decoration: none; }

.layout { display: flex; min-height: calc(100vh - 53px); }

.sidebar {
    width: var(--sidebar-width);
    background: #fff;
    border-right: 1px solid var(--color-border);
    padding: 16px 0;
}

.sidebar nav { display: flex; flex-direction: column; }
.sidebar nav a {
    padding: 10px 24px;
    color: var(--color-text);
    text-decoration: none;
}
.sidebar nav a:hover { background: var(--color-bg); }

.content { flex: 1; padding: 24px; }

.cards { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 24px; }
.card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 20px;
    width: 240px;
}
.card a { color: var(--color-primary); text-decoration: none; font-weight: 600; }

/* --- Auth / Login --- */
.auth-body {
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
.auth-wrapper { width: 100%; max-width: 380px; }
.auth-card {
    background: #fff;
    border-radius: 10px;
    padding: 32px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.auth-card h1 { margin: 0 0 4px; font-size: 22px; }
.auth-card__subtitle { color: #6b7280; margin: 0 0 20px; font-size: 14px; }

.auth-card form { display: flex; flex-direction: column; gap: 6px; }
.auth-card label { font-size: 13px; font-weight: 600; margin-top: 8px; }
.auth-card input {
    padding: 10px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
}

.btn {
    margin-top: 16px;
    padding: 10px;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    cursor: pointer;
}
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-dark); }

.alert { padding: 10px; border-radius: 6px; font-size: 14px; margin-bottom: 8px; }
.alert--error { background: #fee2e2; color: var(--color-error); }