:root {
    --bg: #f5f6f8;
    --card: #ffffff;
    --border: #e2e5eb;
    --text: #1f2430;
    --text-muted: #5c6370;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --error: #dc2626;
    --info-bg: #eff6ff;
    --info-border: #bfdbfe;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.topbar {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
}
.topbar-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.brand {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
}
.logout-form {
    display: flex;
    align-items: center;
    gap: 12px;
}
.user-label {
    color: var(--text-muted);
    font-size: 14px;
}

.container {
    max-width: 960px;
    margin: 32px auto;
    padding: 0 24px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 20px;
}
.card-info {
    background: var(--info-bg);
    border-color: var(--info-border);
}

.login-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px;
    max-width: 400px;
    margin: 60px auto;
}
.login-card h2 {
    margin-top: 0;
}

label {
    display: block;
    margin-top: 16px;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
}
input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 15px;
    font-family: inherit;
}
input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    font-family: inherit;
}
.btn-primary {
    background: var(--primary);
    color: white;
    margin-top: 20px;
    width: 100%;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary {
    background: transparent;
    border-color: var(--border);
    color: var(--text);
    padding: 6px 12px;
    font-size: 13px;
}
.btn-secondary:hover { background: var(--bg); }

.flash-zone { margin-bottom: 20px; }
.flash {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 10px;
    font-size: 14px;
}
.flash-error { background: #fef2f2; color: var(--error); border: 1px solid #fecaca; }
.flash-warning { background: #fffbeb; color: var(--warning); border: 1px solid #fde68a; }
.flash-success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }