:root {
    --color-primary: #1e4d8b; --color-primary-dark: #163a68; --color-bg: #f4f6f9;
    --color-card: #ffffff; --color-text: #1f2933; --color-muted: #6b7280;
    --color-border: #e2e8f0; --color-success: #1e7a3c; --color-danger: #b3261e; --radius: 10px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background: var(--color-bg); color: var(--color-text); }
a { color: var(--color-primary); }
.navbar { background: var(--color-primary); color: #fff; padding: 0.9rem 1.5rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.navbar .brand { font-weight: 600; font-size: 1.1rem; }
.navbar .nav-right { display: flex; align-items: center; gap: 1rem; font-size: 0.9rem; }
.navbar a.logout { color: #fff; text-decoration: none; background: rgba(255,255,255,0.15); padding: 0.4rem 0.9rem; border-radius: var(--radius); }
.navbar a.logout:hover { background: rgba(255,255,255,0.28); }
.subnav { background: var(--color-primary-dark); display: flex; gap: 0.3rem; padding: 0 1rem; flex-wrap: wrap; }
.subnav a { color: #dbe6f5; text-decoration: none; padding: 0.6rem 0.9rem; font-size: 0.88rem; border-bottom: 3px solid transparent; }
.subnav a:hover { color: #fff; border-bottom-color: rgba(255,255,255,0.5); }
.container { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }
.login-wrapper { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.login-card { background: var(--color-card); border-radius: var(--radius); box-shadow: 0 6px 24px rgba(0,0,0,0.08); padding: 2.2rem; width: 100%; max-width: 380px; }
.login-card h1 { font-size: 1.3rem; margin-bottom: 1.4rem; color: var(--color-primary-dark); text-align: center; }

.login-logo-container {
    text-align: center;
    margin-bottom: 20px;
}

.login-logo {
    max-width: 300px; /* Adjust this to change the size of your logo */
    height: auto;
    display: inline-block;
}

.field { margin-bottom: 1.1rem; }
label { display: block; font-size: 0.85rem; margin-bottom: 0.35rem; color: var(--color-muted); }
input[type="text"], input[type="password"], input[type="number"] { width: 100%; padding: 0.65rem 0.8rem; border: 1px solid var(--color-border); border-radius: var(--radius); font-size: 1rem; }
input:focus { outline: none; border-color: var(--color-primary); }
button, .btn { background: var(--color-primary); color: #fff; border: none; padding: 0.7rem 1.2rem; border-radius: var(--radius); font-size: 1rem; cursor: pointer; width: 100%; }
button:hover, .btn:hover { background: var(--color-primary-dark); }
.alert { padding: 0.7rem 0.9rem; border-radius: var(--radius); font-size: 0.9rem; margin-bottom: 1rem; }
.alert-error { background: #fdecea; color: var(--color-danger); border: 1px solid #f3c4c0; }
.alert-success { background: #e8f6ec; color: var(--color-success); border: 1px solid #bfe6cb; }
.alert-warning { background: #fdf3e6; color: #8a5a10; border: 1px solid #f0d9b5; }
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.card { background: var(--color-card); border-radius: var(--radius); padding: 1.2rem; box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.card .card-label { font-size: 0.8rem; color: var(--color-muted); text-transform: uppercase; letter-spacing: 0.03em; }
.card .card-value { font-size: 1.9rem; font-weight: 700; color: var(--color-primary-dark); margin-top: 0.3rem; }
.section-title { margin-top: 2rem; margin-bottom: 0.8rem; color: var(--color-primary-dark); }
.list-table { width: 100%; border-collapse: collapse; background: var(--color-card); border-radius: var(--radius); overflow: hidden; }
.list-table th, .list-table td { text-align: left; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--color-border); font-size: 0.92rem; }
.list-table th { background: #f0f3f8; color: var(--color-muted); font-weight: 600; }
.badge { display: inline-block; padding: 0.15rem 0.6rem; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge-open { background: #e5f5ea; color: var(--color-success); }
.badge-closed { background: #f3e8e8; color: var(--color-danger); }
.empty-state { background: var(--color-card); border-radius: var(--radius); padding: 1.5rem; color: var(--color-muted); text-align: center; }
.form-card { background: var(--color-card); border-radius: var(--radius); padding: 1.3rem 1.4rem; box-shadow: 0 2px 8px rgba(0,0,0,0.05); margin-bottom: 1.5rem; }
.form-card h2 { margin-top: 0; font-size: 1.05rem; color: var(--color-primary-dark); }
.form-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.form-row .field { flex: 1; min-width: 180px; }
select { width: 100%; padding: 0.6rem 0.7rem; border: 1px solid var(--color-border); border-radius: var(--radius); font-size: 0.95rem; background: #fff; }
.btn-small { width: auto; padding: 0.35rem 0.8rem; font-size: 0.82rem; border-radius: 6px; }
.btn-secondary { background: #edf1f7; color: var(--color-primary-dark); }
.btn-secondary:hover { background: #dde5f0; }
.btn-danger { background: var(--color-danger); }
.btn-danger:hover { background: #8f1e18; }
.inline-form { display: inline; }
.action-cell { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.text-muted { color: var(--color-muted); font-size: 0.85rem; }
.grades-table-wrapper { overflow-x: auto; }
.grades-table { border-collapse: collapse; background: var(--color-card); border-radius: var(--radius); min-width: 100%; }
.grades-table th, .grades-table td { border-bottom: 1px solid var(--color-border); padding: 0.5rem 0.6rem; text-align: center; white-space: nowrap; font-size: 0.9rem; }
.grades-table th { background: #f0f3f8; color: var(--color-muted); font-weight: 600; }
.grades-table td:first-child, .grades-table th:first-child { text-align: left; position: sticky; left: 0; background: var(--color-card); }
.grades-table th:first-child { background: #f0f3f8; }
.score-input { width: 64px; padding: 0.35rem; border: 1px solid var(--color-border); border-radius: 6px; text-align: center; }
.score-input:disabled { background: #f4f6f9; color: var(--color-muted); }
.label-input { width: 110px; padding: 0.3rem; border: 1px solid var(--color-border); border-radius: 6px; text-align: center; font-weight: 600; background: #fff; }
.label-input:disabled { background: #f0f3f8; border: none; color: var(--color-muted); font-weight: 600; }
.col-remove-btn { display: block; margin: 0 auto 0.3rem; background: none; border: none; color: var(--color-danger); cursor: pointer; font-size: 0.85rem; width: auto; padding: 0; }
.avg-cell { font-weight: 600; color: var(--color-primary-dark); }
.banner-info { background: #eef4fb; border: 1px solid #cfe0f3; color: var(--color-primary-dark); padding: 0.7rem 0.9rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.9rem; }
.banner-locked { background: #fdf3e6; border: 1px solid #f0d9b5; color: #8a5a10; padding: 0.7rem 0.9rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.9rem; }
.banner-sync { background: #fdf3e6; border: 1px solid #f0d9b5; color: #8a5a10; padding: 0.7rem 0.9rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.9rem; display: none; }
.banner-sync a { color: #8a5a10; font-weight: 600; }
.banner-delete-warning { background: #fdecea; border: 2px solid var(--color-danger); color: var(--color-danger); padding: 1rem 1.1rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.92rem; }
.banner-delete-safe { background: #e8f6ec; border: 1px solid #bfe6cb; color: var(--color-success); padding: 1rem 1.1rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.92rem; }

@media (max-width: 600px) {
    .navbar { flex-direction: column; align-items: flex-start; }
}