:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --background-color: #f4f4f9;
    --error-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f1c40f;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
    color: #333;
}

.container {
    max-width: 920px;
    margin: 0 auto;
    padding: 20px;
    background: white;
    min-height: 100vh;
    border-radius: 14px;
    border: 1px solid rgba(15, 23, 42, 0.06);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

header {
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
}

.hidden {
    display: none !important;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"], input[type="number"], select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
    resize: vertical;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: rgba(52, 152, 219, 0.7);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
}

.primary-btn:hover {
    background-color: #2980b9;
}

.secondary-btn {
    background-color: var(--secondary-color);
    color: white;
}

.secondary-btn:hover {
    background-color: #1f2a44;
}

.question-card {
    background: #fff;
    border: 1px solid rgba(15, 23, 42, 0.08);
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 14px;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.05);
}

.question-stem {
    font-weight: bold;
    margin-bottom: 10px;
}

.options-list {
    list-style: none;
    padding: 0;
}

.options-list li {
    margin-bottom: 5px;
}

.result-card {
    border: 1px solid rgba(15, 23, 42, 0.08);
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 14px;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.05);
}

.result-card button {
    margin-top: 10px;
    margin-right: 8px;
}

.correct {
    border-left: 5px solid var(--success-color);
}

.incorrect {
    border-left: 5px solid var(--error-color);
}

.ai-feedback {
    background-color: #fff8e1;
    padding: 10px;
    margin-top: 10px;
    border-radius: 10px;
    border: 1px solid #ffe0b2;
}

.feedback-label {
    font-weight: bold;
    color: #d35400;
}

.alert-box {
    background-color: #fff3cd;
    color: #856404;
    padding: 10px;
    border: 1px solid #ffeeba;
    border-radius: 4px;
    margin-bottom: 15px;
}

/* Modal */
.modal {
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 6vh auto;
    padding: 20px;
    border: 1px solid #888;
    width: min(920px, 94%);
    border-radius: 12px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.22);
}

.close-btn {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close-btn:hover,
.close-btn:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

.admin-container {
    max-width: 1120px;
    background: transparent;
    box-shadow: none;
    border: none;
    border-radius: 0;
    min-height: 100vh;
}

.admin-shell {
    background: white;
    border-radius: 14px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    border: 1px solid rgba(15, 23, 42, 0.06);
    padding: 18px;
}

.admin-nav {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin: 14px 0 6px;
}

.admin-nav button {
    background: #f3f6ff;
    color: #1f2a44;
    border: 1px solid #dbe5ff;
    padding: 10px 14px;
    border-radius: 10px;
}

.admin-nav button.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.admin-card {
    background: white;
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 14px;
    padding: 18px;
    box-shadow: 0 10px 22px rgba(15, 23, 42, 0.06);
    margin-bottom: 16px;
}

.admin-card h3 {
    margin-top: 0;
}

.admin-subtitle {
    opacity: 0.8;
    margin-top: -6px;
}

.generated-list {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.generated-item {
    background: white;
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 14px;
    padding: 14px;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.05);
}