:root {
    --bg-primary: #0f172a;
    --bg-card: #1e293b;
    --border-color: #334155;
    --text-primary: #f8fafc;
    --text-muted: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* University-Level Professional Navigation Header */
header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 70px;
}

.brand-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 20px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 10px 12px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.nav-link:hover, .nav-link.active {
    color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.1);
}

/* Dropdown Menus on Hover */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    min-width: 220px;
    padding: 8px 0;
    display: none;
    list-style: none;
    margin: 5px 0 0 0;
}

.nav-item:hover .dropdown-menu {
    display: block;
}

.dropdown-item {
    display: block;
    padding: 10px 18px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.dropdown-item:hover {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
}

.auth-btn {
    background: var(--accent-blue);
    color: white !important;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;

    &.logout {
        background: var(--danger);
    }
}

/* Forms & Error Displays */
.form-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 30px;
    max-width: 500px;
    margin: 40px auto;
}

.form-group {
    margin-bottom: 20px;

    label {
        display: block;
        font-size: 0.85rem;
        color: var(--text-muted);
        margin-bottom: 8px;
        text-transform: uppercase;
        font-weight: 600;
    }

    input, select, textarea {
        width: 100%;
        padding: 10px 12px;
        background: #0f172a;
        border: 1px solid var(--border-color);
        border-radius: 6px;
        color: white;
        font-size: 0.95rem;
        box-sizing: border-box;

        &:focus {
            outline: none;
            border-color: var(--accent-blue);
        }
    }
}

.password-wrapper {
    position: relative;

    .toggle-pass {
        position: absolute;
        right: 12px;
        top: 50%;
        transform: translateY(-50%);
        cursor: pointer;
        font-size: 0.8rem;
        color: var(--text-muted);
    }
}

.error-banner {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-bottom: 20px;
    display: none;
}

.btn-primary {
    background: var(--accent-blue);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    font-size: 1rem;

    &:hover {
        background: var(--accent-hover);
    }
}