:root {
    color-scheme: light dark;
    font-family: 'Segoe UI', system-ui, sans-serif;
    --bg: #ffffff;
    --fg: #202124;
    --primary: #0a74da;
    --muted: #6b7280;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

.site-header {
    background: #0b1a33;
    color: #f8fafc;
    padding: 1rem 0;
}

.site-header .brand {
    color: #f8fafc;
    font-size: 1.4rem;
    text-decoration: none;
    font-weight: 600;
}

.site-header .main-nav a {
    margin-left: 1rem;
    color: #dbeafe;
    text-decoration: none;
    font-size: 0.95rem;
}

.site-main {
    padding: 2rem 0 3rem;
}

.card {
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    background: #fff;
    box-shadow: 0 1px 2px rgba(15,23,42,.08);
}

.card h2 {
    margin-top: 0;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.table th,
.table td {
    border: 1px solid #e5e7eb;
    padding: 0.6rem 0.8rem;
    text-align: left;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: none;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    cursor: pointer;
}

.btn-secondary {
    background: #475569;
}

.form-group {
    margin-bottom: 1rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 0.6rem;
    border-radius: 6px;
    border: 1px solid #cbd5f5;
}

.site-footer {
    background: #0f172a;
    color: #e2e8f0;
    padding: 2rem 0;
}

@media (max-width: 640px) {
    .site-header .main-nav {
        display: flex;
        flex-wrap: wrap;
        margin-top: 0.5rem;
    }
    .site-header .main-nav a {
        margin: 0.3rem 0.6rem 0 0;
    }
}
.flash {
    background: #ecfdf5;
    border: 1px solid #059669;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.flash-error {
    background: #fee2e2;
    border-color: #b91c1c;
}

.flash-hide {
    opacity: 0;
    transition: opacity 0.4s ease;
}