/* General Styles for SPA */
body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f6f9;
}

#app-content {
    min-height: calc(100vh - 60px);
    transition: opacity 0.2s ease-in-out;
}

/* Page Loader */
.page-loader {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.8);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
}

/* Sidebar Layout */
.wrapper {
    display: flex;
    width: 100%;
}
.sidebar {
    width: 250px;
    height: 100vh;
    background: #343a40;
    color: #fff;
    position: fixed;
    overflow-y: auto;
}
.sidebar .nav-link {
    color: #c2c7d0;
}
.sidebar .nav-link:hover, .sidebar .nav-link.active {
    color: #fff;
    background: rgba(255,255,255,0.1);
}
.main-panel {
    width: calc(100% - 250px);
    margin-left: 250px;
    min-height: 100vh;
}

/* Exam Interface */
.exam-header {
    background: #fff;
    border-bottom: 1px solid #ddd;
    padding: 10px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}
.question-nav-btn {
    width: 40px;
    height: 40px;
    margin: 3px;
    border-radius: 4px;
    border: 1px solid #ccc;
    background: #fff;
}
.question-nav-btn.answered {
    background: #198754;
    color: #fff;
    border-color: #198754;
}
.question-nav-btn.doubtful {
    background: #ffc107;
    color: #000;
    border-color: #ffc107;
}
.question-nav-btn.active {
    border: 2px solid #0d6efd;
    font-weight: bold;
}

/* Auth Layout */
.auth-wrapper {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #e9ecef;
}
.auth-card {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

@media (max-width: 768px) {
    .sidebar {
        left: -250px;
        transition: 0.3s;
    }
    .sidebar.show {
        left: 0;
    }
    .main-panel {
        width: 100%;
        margin-left: 0;
    }
}