:root {
    --primary: #000;
    --secondary: #333;
    --tertiary: #666;
    --quaternary: #999;
    --light: #f8f8f8;
    --white: #fff;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-heavy: rgba(0, 0, 0, 0.3);
    --border: rgba(0, 0, 0, 0.08);
    --success: #1a5f4a;
    --danger: #5f1a1a;
    --info: #1a4a5f;
    --success-light: rgba(26, 95, 74, 0.1);
    --danger-light: rgba(95, 26, 26, 0.1);
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
    font-family: 'Georgia', 'Times New Roman', serif;
    background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
    color: var(--primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--white);
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px var(--shadow);
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 50%;
    width: 60%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    transform: translateX(-50%);
}

.title {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 4px;
    margin: 0 0 1rem 0;
    text-transform: uppercase;
    position: relative;
}

.subtitle {
    font-size: 0.9rem;
    color: var(--tertiary);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.user-info {
    margin-top: 1rem;
    font-size: 1rem;
    color: var(--secondary);
    font-weight: bold;
}

.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.auth-form {
    max-width: 400px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--light);
    border: 1px solid var(--border);
    box-shadow: 0 2px 10px var(--shadow);
    margin-top: 2rem;
}

.auth-form h3 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    font-weight: normal;
}

.btn {
    background: var(--white);
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 0.75rem 2rem;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-heavy);
}

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

.btn.primary:hover {
    background: var(--secondary);
}

.btn.danger {
    border-color: var(--danger);
    color: var(--danger);
}

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

.btn.info {
    border-color: var(--info);
    color: var(--info);
}

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

.grid {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 2rem;
    margin-top: 3rem;
}

@media (max-width: 968px) {
    .grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--white);
    border: 1px solid var(--border);
    padding: 2rem;
    box-shadow: 0 4px 20px var(--shadow);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
}

.card h2 {
    margin: 0 0 2rem 0;
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-align: center;
    color: var(--primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.9rem;
    color: var(--tertiary);
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

input[type="text"], input[type="email"], input[type="password"], textarea, select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    background: var(--light);
    color: var(--primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.1);
}

textarea {
    min-height: 100px;
    resize: vertical;
}

.quiz-types {
    display: flex;
    gap: 2rem;
    margin: 1rem 0;
}

.quiz-type {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.quiz-type input[type="radio"] {
    width: auto;
    margin: 0;
}

.quiz-type label {
    margin: 0;
    font-size: 0.9rem;
    text-transform: none;
    cursor: pointer;
}

.conditional-field {
    display: none;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.conditional-field.active {
    display: block;
}

.ox-answer {
    display: flex;
    gap: 2rem;
    margin-top: 0.5rem;
}

.ox-answer label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-transform: none;
    cursor: pointer;
}

.choices-container {
    margin-top: 0.5rem;
}

.choice-item {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    background: var(--light);
    border: 1px solid var(--border);
}

.choice-item.correct {
    background: rgba(26, 95, 74, 0.1);
    border-color: var(--success);
}

.choice-item input {
    flex: 1;
    margin: 0;
    background: transparent;
    border: none;
}

.choice-item button {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

.records {
    background: var(--white);
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px var(--shadow);
}

.records-header {
    padding: 1rem 1.5rem;
    background: var(--light);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.pill {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary);
    color: var(--white);
    font-size: 0.8rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.search-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.search-controls input {
    width: 200px;
}

.table-container {
    max-height: 500px;
    overflow: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--light);
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    font-size: 0.8rem;
    position: sticky;
    top: 0;
    white-space: nowrap;
}

td {
    white-space: normal; /* 본문은 정상 줄바꿈 */
    word-break: keep-all; /* 한글 단어 단위로 줄바꿈 */
}

tr:hover td {
    background: var(--light);
}

.table-item {
    max-width: 250px;   /* 더 작은 폭으로 제한 */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.modal.open {
    display: flex;
    opacity: 1;
    transform: scale(1);
}

.modal.small-modal .modal-content {
    max-width: 400px;
    padding: 2rem;
    text-align: center;
}

.modal-content {
    background: var(--white);
    width: min(800px, 90vw);
    max-height: 80vh;
    padding: 3rem;
    position: relative;
    border: 2px solid var(--primary);
    box-shadow: 0 20px 60px var(--shadow-heavy);
}

.modal-content.analysis, .modal-content.stats {
    max-width: 600px;
    overflow: auto;
}

.modal-content::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(45deg, var(--primary), transparent, var(--primary));
    z-index: -1;
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--tertiary);
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    color: var(--primary);
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.progress-bar {
    width: 200px;
    height: 4px;
    background: var(--border);
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 0.3s ease;
}

.question {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.options {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
}

.option {
    padding: 1rem;
    border: 1px solid var(--border);
    background: var(--light);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.option[disabled] {
    cursor: not-allowed;
    background: var(--quaternary);
    color: var(--white);
    opacity: 0.5;
}

.tf-buttons {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.tf-buttons .btn {
    min-width: 120px;
}

.tf-buttons .btn[disabled] {
    cursor: not-allowed;
    background: var(--quaternary);
    color: var(--white);
    opacity: 0.5;
}

.feedback {
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--light);
    border-left: 4px solid var(--primary);
    transition: all 0.3s ease;
}

.feedback.correct {
    border-color: var(--success);
    background: var(--success-light);
}

.feedback.incorrect {
    border-color: var(--danger);
    background: var(--danger-light);
}

.quiz-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.quiz-start-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.quiz-controls select {
    width: auto;
    min-width: 100px;
}

.finished-controls {
    display: none;
    justify-content: center;
    gap: 1rem;
}

.finished-controls.show {
    display: flex;
}

.analysis-results {
    display: grid;
    gap: 1.5rem;
}

.analysis-results h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.analysis-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.analysis-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px dashed var(--border);
}

.stats-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--light);
    border: 1px solid var(--border);
}

.stat-item .stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
}

.stat-item .stat-label {
    font-size: 0.9rem;
    color: var(--tertiary);
    text-transform: uppercase;
}


.row {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.hidden {
    display: none !important;
}

.loading {
    pointer-events: none;
    opacity: 0.7;
    cursor: wait;
}

.small {
    font-size: 0.85rem;
    color: var(--tertiary);
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .title {
        font-size: 2rem;
        letter-spacing: 2px;
    }

    .modal-content {
        padding: 2rem;
    }

    .quiz-types {
        flex-direction: column;
        gap: 1rem;
    }

    .controls {
        justify-content: center;
    }

    .search-controls {
        flex-direction: column;
        width: 100%;
    }

    .search-controls input {
        width: 100%;
    }
}