/* === Back Navigation === */
.back-nav {
    margin-bottom: 16px;
}

.back-nav a {
    color: var(--text-muted-color);
    text-decoration: none;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s;
}

.back-nav a:hover {
    color: var(--text-secondary-color);
}

.back-nav .material-icons {
    font-size: 16px;
}

/* === Study Common === */
.study-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.study-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0;
}

.btn-sm {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-sm .material-icons {
    font-size: 18px;
}

.btn-sm-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px rgba(255, 87, 34, 0.2);
}

.btn-sm-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-sm-secondary {
    background-color: #666;
    color: white;
}

.btn-sm-secondary:hover {
    background-color: #444;
}

.btn-sm-outline {
    background-color: var(--surface-color);
    color: var(--primary-color);
    border: 1.5px solid var(--primary-color);
}

.btn-sm-outline:hover {
    background-color: var(--tint-orange-bg);
}

.btn-sm-danger {
    background-color: var(--surface-color);
    color: #d32f2f;
    border: 1.5px solid #d32f2f;
}

.btn-sm-danger:hover {
    background-color: #ffebee;
}

/* === Search Bar === */
.study-search {
    position: relative;
    margin-bottom: 24px;
}

.study-search .material-icons {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted-color);
    font-size: 20px;
}

.study-search input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--surface-color);
    transition: border-color 0.2s;
    font-family: inherit;
}

.study-search input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
}

/* === Section Tabs === */
.study-section-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.study-section-tab {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-secondary-color);
    background: var(--surface-color);
    border: 1.5px solid var(--border-color);
    transition: all 0.2s;
    cursor: pointer;
}

.study-section-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.study-section-tab.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* === Group Card Grid === */
.group-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.group-card {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.group-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.group-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0 0 8px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.group-card-title .material-icons {
    font-size: 20px;
    color: var(--primary-color);
}

.group-card-desc {
    font-size: 0.88rem;
    color: var(--text-secondary-color);
    margin-bottom: 14px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.group-card-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.group-badge {
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 600;
}

.group-badge-subject {
    background-color: #e3f2fd;
    color: #1565c0;
}

.group-badge-region {
    background-color: #f3e5f5;
    color: #7b1fa2;
}

.group-badge-members {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.group-badge-private {
    background-color: var(--tint-orange-bg);
    color: #e65100;
}

.group-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted-color);
}

.invite-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border: 1.5px solid var(--primary-color);
    border-radius: 14px;
    background: var(--surface-color);
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

.invite-btn:hover {
    background: var(--tint-orange-bg);
}

.invite-btn .material-icons {
    font-size: 14px;
}

/* === Group Detail Header === */
.group-top-row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.group-top-row > .group-detail-header {
    flex: 1;
    min-width: 0;
}

.group-top-row > .attendance-section {
    flex: 0 0 280px;
}

.group-detail-header {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.group-detail-title-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 8px;
}

.group-detail-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0;
}

.group-detail-desc {
    color: var(--text-secondary-color);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.group-detail-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.group-detail-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.group-detail-actions .slug-display {
    font-size: 0.8rem;
    color: var(--text-muted-color);
    margin-left: auto;
}

/* === Post Tabs === */
.post-tabs {
    display: flex;
    background: var(--surface-color);
    border-radius: 10px;
    margin-bottom: 16px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
    overflow-x: auto;
}

.post-tab {
    flex: 1;
    min-width: fit-content;
    text-align: center;
    padding: 12px 16px;
    text-decoration: none;
    color: var(--text-muted-color);
    font-weight: 600;
    font-size: 0.88rem;
    border: none;
    border-bottom: 2px solid transparent;
    background: none;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.post-tab:hover {
    color: var(--text-secondary-color);
    background-color: var(--surface-alt-color);
}

.post-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.post-tab .material-icons {
    font-size: 18px;
}

.post-tab {
    position: relative;
}

.tab-badge-dot {
    width: 8px;
    height: 8px;
    background: #F44336;
    border-radius: 50%;
    position: absolute;
    top: 8px;
    right: 8px;
}

/* 인증 알림 배너 */
.challenge-pending-banner {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--tint-orange-bg);
    border: 1px solid #FFE0B2;
    border-radius: 10px;
    margin-bottom: 16px;
    font-size: 0.88rem;
    color: #E65100;
}

.challenge-pending-banner .material-icons {
    font-size: 20px;
    color: #FF9800;
    flex-shrink: 0;
}

.challenge-pending-banner-btn {
    margin-left: auto;
    flex-shrink: 0;
    padding: 6px 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.82rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.2s;
}

.challenge-pending-banner-btn:hover {
    background: #E64A19;
}

/* === Post List === */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.post-item {
    background: var(--surface-color);
    border-radius: 10px;
    padding: 16px 20px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
    text-decoration: none;
    color: inherit;
    display: block;
    transition: background-color 0.15s;
}

.post-item:hover {
    background-color: var(--surface-alt-color);
}

.post-item-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.post-type-badge {
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 700;
}

.post-type-badge--question {
    background-color: #e3f2fd;
    color: #1565c0;
}

.post-type-badge--proof {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.post-type-badge--notice {
    background-color: var(--tint-orange-bg);
    color: #e65100;
}

.post-type-badge--general {
    background-color: var(--surface-alt-color);
    color: var(--text-secondary-color);
}

.post-item-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color);
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.post-item-pinned {
    color: var(--primary-color);
    font-size: 16px;
}

/* Post participation status */
.post-item--todo {
    border-left: 3px solid #ffb74d;
}

.post-item--done {
    border-left: 3px solid #81c784;
}

.post-status-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.post-status-icon .material-icons {
    font-size: 18px;
}

.post-status-icon--done .material-icons {
    color: #4caf50;
}

.post-status-icon--todo .material-icons {
    color: var(--text-muted-color);
}

.post-item-footer {
    display: flex;
    gap: 12px;
    font-size: 0.78rem;
    color: var(--text-muted-color);
    align-items: center;
}

.post-item-footer .material-icons {
    font-size: 14px;
    vertical-align: middle;
    margin-right: 2px;
}

.post-item-stat {
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

/* === Post Detail === */
.post-detail {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 28px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.post-detail-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.post-detail-top-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
}

.post-detail-type {
    margin-bottom: 10px;
}

.post-detail-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0 0 10px 0;
}

.post-detail-meta {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-muted-color);
    align-items: center;
}

.post-detail-meta .material-icons {
    font-size: 16px;
    vertical-align: middle;
    margin-right: 3px;
}

.post-detail-body {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-color);
    white-space: pre-wrap;
    word-break: break-word;
    margin-bottom: 16px;
}

.post-detail-image {
    margin-top: 20px;
}

.post-detail-image img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.post-detail-actions {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* === Official Answer (Question) === */
.official-answer {
    background: linear-gradient(135deg, #e8f5e9, #f1f8e9);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    border-left: 4px solid #4caf50;
}

.official-answer-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    font-weight: 700;
    color: #2e7d32;
    font-size: 0.95rem;
}

.official-answer-header .material-icons {
    font-size: 20px;
}

.official-answer-body {
    font-size: 0.95rem;
    line-height: 1.8;
    color: #333;
    white-space: pre-wrap;
    word-break: break-word;
}

/* === Answer Form === */
.answer-prompt {
    background: var(--surface-alt-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    text-align: center;
}

.answer-prompt p {
    color: var(--text-secondary-color);
    margin-bottom: 16px;
    font-size: 0.92rem;
}

.answer-prompt .material-icons {
    font-size: 40px;
    color: var(--border-color);
    margin-bottom: 8px;
    display: block;
}

.answer-form textarea {
    width: 100%;
    min-height: 120px;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.2s;
    margin-bottom: 12px;
}

.answer-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.answer-form button {
    padding: 10px 16px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background-color 0.2s;
    align-self: flex-end;
}

.answer-form button:hover {
    background-color: var(--primary-dark);
}

/* === Answer List === */
.answer-list {
    margin-bottom: 20px;
}

.answer-list-header {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.answer-item {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 10px;
}

.answer-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.answer-item-author {
    font-weight: 600;
    color: var(--text-color);
}

.answer-item-date {
    color: var(--text-muted-color);
}

.answer-item-body {
    font-size: 0.92rem;
    line-height: 1.7;
    color: var(--text-color);
    white-space: pre-wrap;
    word-break: break-word;
}

.answer-item--mine {
    border-color: var(--primary-light);
    background-color: var(--tint-brand-bg);
}

/* === Comment Section === */
.comment-section {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    overflow: hidden;
}

.comment-section-header {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.comment-section-header .material-icons {
    font-size: 20px;
    color: var(--primary-color);
}

.comment-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.comment-item:last-child {
    border-bottom: none;
}

.comment-item-header {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 4px;
    font-size: 0.82rem;
}

.comment-item-author {
    font-weight: 600;
    color: var(--text-color);
}

.comment-item-date {
    color: var(--text-muted-color);
}

.comment-delete-btn {
    background: none;
    border: none;
    color: var(--text-muted-color);
    cursor: pointer;
    padding: 2px;
    display: flex;
    align-items: center;
    transition: color 0.2s;
}

.comment-delete-btn:hover {
    color: #d32f2f;
}

.comment-delete-btn .material-icons {
    font-size: 16px;
}

.comment-item-body {
    font-size: 0.9rem;
    color: var(--text-secondary-color);
    line-height: 1.5;
}

.comment-form {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    max-width: 100%;
}

.comment-form input,
.comment-form textarea {
    flex: 1;
    min-width: 0;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color 0.2s;
    box-sizing: border-box;
    resize: vertical;
}

.comment-form input:focus,
.comment-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.comment-form button {
    flex-shrink: 0;
    margin-left: auto;
    padding: 10px 16px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background-color 0.2s;
    white-space: nowrap;
    box-sizing: border-box;
}

.comment-form button:hover {
    background-color: var(--primary-dark);
}

/* === Write Form === */
.write-form {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 28px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.write-form .form-group {
    margin-bottom: 20px;
    text-align: left;
}

.write-form label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.write-form input[type="text"],
.write-form textarea,
.write-form select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s;
    background-color: var(--surface-alt-color);
}

.write-form input[type="text"]:focus,
.write-form textarea:focus,
.write-form select:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--surface-color);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.write-form textarea {
    min-height: 200px;
    resize: vertical;
    line-height: 1.7;
}

.write-form .answer-field textarea {
    min-height: 150px;
    background-color: var(--tint-mint-bg);
}

.type-selector {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.type-selector label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
    font-size: 0.88rem;
    color: var(--text-secondary-color);
}

.type-selector input[type="radio"] {
    display: none;
}

.type-selector input[type="radio"]:checked + label,
.type-selector label.selected {
    border-color: var(--primary-color);
    background-color: var(--tint-orange-bg);
    color: var(--primary-color);
    font-weight: 600;
}

.type-selector label .material-icons {
    font-size: 18px;
}

/* === 출석 현황 === */
.attendance-section {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 0;
    border: 1px solid var(--border-color);
}

.attendance-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-color);
    margin-bottom: 16px;
}

.attendance-header .material-icons {
    color: var(--primary-color);
    font-size: 20px;
}

.attendance-calendar {
    margin-bottom: 16px;
}

.attendance-dow {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-size: 0.72rem;
    color: var(--text-muted-color);
    margin-bottom: 6px;
}

.attendance-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    text-align: center;
}

.attendance-day {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1;
    border-radius: 50%;
    font-size: 0.78rem;
    color: var(--text-muted-color);
}

.attendance-day--empty {
    visibility: hidden;
}

.attendance-day--done {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.attendance-day--today {
    outline: 2px solid var(--primary-color);
    outline-offset: 1px;
}

.attendance-day--today.attendance-day--done {
    outline-color: var(--primary-dark);
}

.attendance-ranking {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.attendance-member {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--text-secondary-color);
    background: var(--surface-alt-color);
    padding: 4px 10px;
    border-radius: 12px;
}

.attendance-member strong {
    color: var(--primary-color);
    font-weight: 600;
}

.type-selector--disabled {
    opacity: 0.6;
    pointer-events: none;
}

.answer-field {
    display: none;
    padding: 16px;
    background: var(--tint-mint-bg);
    border-radius: 8px;
    border: 1px dashed #81c784;
}

.answer-field.show {
    display: block;
}

.answer-field-hint {
    font-size: 0.82rem;
    color: var(--text-secondary-color);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.answer-field-hint .material-icons {
    font-size: 16px;
    color: #4caf50;
}

/* === Empty State === */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted-color);
}

.empty-state .material-icons {
    font-size: 56px;
    margin-bottom: 12px;
    color: var(--border-color);
}

.empty-state p {
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.empty-state .empty-sub {
    font-size: 0.82rem;
    color: var(--text-muted-color);
}

/* === Message (Flash) === */
.study-message {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.study-message .material-icons {
    font-size: 18px;
}

.study-message--success {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.study-message--error {
    background-color: #ffebee;
    color: #d32f2f;
}

/* === Member List === */
.member-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.member-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    background: var(--surface-alt-color);
    border-radius: 16px;
    font-size: 0.82rem;
    color: var(--text-secondary-color);
    text-decoration: none;
    transition: background 0.15s;
}

.member-chip:hover {
    background: var(--border-color);
}

.member-chip .material-icons {
    font-size: 16px;
    color: var(--text-muted-color);
}

.member-chip--owner .material-icons {
    color: var(--primary-color);
}

.member-kick-icon {
    font-size: 14px !important;
    color: var(--text-muted-color) !important;
    margin-left: 2px;
    border-radius: 50%;
    padding: 1px;
}

.member-kick-icon:hover {
    color: #d32f2f !important;
    background: #ffebee;
}

/* === More Menu (Dropdown) === */
.more-menu-wrapper {
    position: relative;
    display: inline-block;
}

.more-menu-trigger {
    padding: 6px 8px !important;
}

.more-menu-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: var(--surface-color);
    border-radius: 10px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    min-width: 160px;
    z-index: 100;
    overflow: hidden;
}

.more-menu-dropdown.show {
    display: block;
    animation: fadeSlideDown 0.15s ease;
}

@keyframes fadeSlideDown {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.more-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 0.88rem;
    color: var(--text-color);
    text-decoration: none;
    border: none;
    background: none;
    width: 100%;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.15s;
}

.more-menu-item:hover {
    background-color: var(--surface-alt-color);
}

.more-menu-item .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

.more-menu-item--danger {
    color: #d32f2f;
}

.more-menu-item--danger .material-icons {
    color: #d32f2f;
}

.more-menu-item--danger:hover {
    background-color: #ffebee;
}

/* === Floating Write Button === */
.write-fab {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    box-shadow: 0 4px 12px rgba(255, 87, 34, 0.35);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    text-decoration: none;
    z-index: 50;
}

.write-fab:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(255, 87, 34, 0.4);
}

.write-fab .material-icons {
    font-size: 28px;
}

/* === Responsive === */
@media (max-width: 767px) {
    .group-top-row {
        flex-direction: column;
    }

    .group-top-row > .attendance-section {
        flex: none;
    }

    .group-grid {
        grid-template-columns: 1fr;
    }

    .post-detail {
        padding: 20px;
    }

    .write-form {
        padding: 20px;
    }

    .group-detail-header {
        padding: 20px;
    }

    .group-detail-actions .slug-display {
        display: none;
    }

    .study-header {
        flex-direction: column;
        align-items: stretch;
    }

    .study-header .btn-sm {
        justify-content: center;
    }

    /* 모바일 터치 타겟 (44px 이상) */
    .btn-sm {
        min-height: 44px;
        padding: 10px 18px;
        font-size: 0.88rem;
    }

    .post-item {
        padding: 14px 16px;
    }

    .post-tab {
        min-height: 44px;
        padding: 10px 14px;
    }

    .comment-form input,
    .comment-form textarea {
        min-height: 44px;
        font-size: 16px;
    }

    .comment-form button {
        min-height: 44px;
        padding: 0 16px;
    }

    .study-search input {
        font-size: 16px;
    }

    .challenge-week-days {
        gap: 6px;
    }

    .challenge-week-day {
        width: 36px;
        height: 36px;
    }

    .challenge-verify-input input {
        font-size: 16px;
    }

    .challenge-verify-input button {
        min-height: 44px;
    }

    .challenge-detail-actions {
        flex-wrap: wrap;
    }

    .challenge-detail-actions .btn-sm {
        min-height: 44px;
    }

    /* iOS 입력 확대 방지 */
    .write-form input[type="text"],
    .write-form textarea,
    .write-form select {
        font-size: 16px;
    }

    /* iOS 입력 확대 방지 */
    .answer-form textarea {
        font-size: 16px;
    }

    /* 터치타겟 44px */
    .more-menu-item {
        min-height: 44px;
    }
}

/* ── 챌린지 스타일 ── */

/* 주기 뱃지 */
.challenge-freq-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--tint-orange-bg);
    color: #e65100;
    white-space: nowrap;
}

/* 챌린지 카드 (group.php 인증 탭) */
.challenge-card {
    background: var(--surface-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 12px;
    overflow: hidden;
    transition: box-shadow 0.15s;
}

.challenge-card:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.challenge-card-link {
    display: block;
    padding: 16px;
    text-decoration: none;
    color: inherit;
}

.challenge-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.challenge-card-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-color);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.challenge-card-desc {
    font-size: 0.85rem;
    color: var(--text-muted-color);
    margin: 0 0 8px;
    line-height: 1.4;
}

.challenge-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted-color);
}

.challenge-card-participants {
    display: flex;
    align-items: center;
    gap: 4px;
}

.challenge-card-participants .material-icons {
    font-size: 16px;
}

.challenge-today-status {
    display: flex;
    align-items: center;
    gap: 3px;
    font-weight: 500;
}

.challenge-today-status .material-icons {
    font-size: 16px;
}

.challenge-today--done {
    color: var(--primary-color);
}

.challenge-today--pending {
    color: #f57c00;
}

.challenge-today--off {
    color: var(--text-muted-color);
}

.challenge-today--join {
    color: var(--primary-color);
}

/* 빠른 인증 폼 */
.quick-verify-form {
    padding: 0 16px 16px;
}

.challenge-verify-input {
    display: flex;
    gap: 8px;
    align-items: center;
}

.challenge-verify-input input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

.challenge-verify-input input:focus {
    border-color: var(--primary-color);
}

.challenge-verify-input button {
    flex-shrink: 0;
    padding: 10px 14px;
}

.challenge-verify-input button .material-icons {
    font-size: 18px;
}

/* 챌린지 상세 페이지 */
.challenge-detail-header {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.challenge-detail-title-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.challenge-detail-title-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.challenge-detail-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-color);
    margin: 0;
}

.challenge-detail-desc {
    color: var(--text-secondary-color);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.challenge-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-muted-color);
    margin-bottom: 16px;
}

.challenge-detail-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.challenge-detail-meta .material-icons {
    font-size: 16px;
}

.challenge-detail-actions {
    display: flex;
    gap: 8px;
}

.btn-sm-danger {
    color: #d32f2f !important;
    border-color: #d32f2f !important;
}

/* 이번 주 현황 바 */
.challenge-week-bar {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
}

.challenge-week-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary-color);
    margin-bottom: 10px;
}

.challenge-week-days {
    display: flex;
    justify-content: space-between;
    gap: 8px;
}

.challenge-week-day {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    width: 42px;
    height: 42px;
    justify-content: center;
    border-radius: 8px;
    transition: background 0.15s;
}

.challenge-week-day-label {
    font-size: 0.7rem;
    color: var(--text-muted-color);
    font-weight: 500;
}

.challenge-week-day .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

.challenge-week-day--done .material-icons {
    color: var(--primary-color);
}

.challenge-week-day--today {
    background: var(--tint-orange-bg);
    border-radius: 8px;
}

.challenge-week-day--off .material-icons {
    color: var(--border-color);
}

.challenge-week-day:not(.challenge-week-day--done):not(.challenge-week-day--off) .material-icons {
    color: var(--text-muted-color);
}

.challenge-week-day--clickable {
    cursor: pointer;
}

.challenge-week-day--clickable:hover {
    background: var(--surface-alt-color);
}

.challenge-week-day--active {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

/* 인증 폼 (상세 페이지) */
.challenge-verify-form {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 16px;
    border: 2px solid var(--primary-color);
}

.challenge-verify-done {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--tint-orange-bg);
    border-radius: 12px;
    padding: 14px 20px;
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.challenge-verify-done .material-icons {
    font-size: 22px;
}

.challenge-cancel-btn {
    margin-left: auto;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 4px 12px;
    font-size: 0.82rem;
    color: var(--text-muted-color);
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
}

.challenge-cancel-btn:hover {
    border-color: #d32f2f;
    color: #d32f2f;
}

/* 인증 기록 */
/* === Challenge Date Navigation === */
.challenge-date-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-color);
}

.challenge-date-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: none;
    border: none;
    padding: 0;
    color: var(--text-secondary-color);
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
}

.challenge-date-btn:hover:not(:disabled) {
    background: var(--surface-alt-color);
    color: var(--text-color);
}

.challenge-date-btn:disabled {
    color: var(--text-muted-color);
    cursor: default;
}

.challenge-date-current {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary-color);
    min-width: 100px;
    text-align: center;
}

.challenge-date-current--today {
    color: var(--primary-color);
}

.challenge-date-today-btn {
    font-size: 0.8rem;
    color: var(--primary-color);
    text-decoration: none;
    padding: 4px 10px;
    border: 1px solid var(--primary-color);
    border-radius: 12px;
    transition: background 0.15s, color 0.15s;
    margin-left: 4px;
}

.challenge-date-today-btn:hover {
    background: var(--primary-color);
    color: white;
}

.challenge-logs {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
}

.challenge-logs-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary-color);
    margin: 0 0 14px;
}

.challenge-logs-title .material-icons {
    font-size: 20px;
    color: var(--primary-color);
}

.challenge-logs-empty {
    text-align: center;
    color: var(--text-muted-color);
    font-size: 0.9rem;
    padding: 20px 0;
}

.challenge-log-item {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.challenge-log-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.challenge-log-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.challenge-log-header strong {
    font-size: 0.88rem;
    color: var(--text-color);
}

.challenge-log-time {
    font-size: 0.78rem;
    color: var(--text-muted-color);
}

.challenge-log-content {
    font-size: 0.9rem;
    color: var(--text-secondary-color);
    line-height: 1.5;
}

/* 참여자 */
.challenge-participants {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
}

.challenge-participant-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.challenge-participant-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--surface-alt-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary-color);
    text-decoration: none;
}

.challenge-participant-chip strong {
    color: var(--primary-color);
    font-size: 0.8rem;
}

/* 챌린지 생성 - 요일 선택 */
.challenge-day-selector {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.challenge-day-chip {
    cursor: pointer;
}

.challenge-day-chip input {
    display: none;
}

.challenge-day-chip span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted-color);
    transition: all 0.15s;
}

.challenge-day-chip input:checked + span {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.challenge-day-chip span:hover {
    border-color: var(--primary-color);
}

/* 힌트 텍스트 */
.hint {
    font-weight: 400;
    color: var(--text-muted-color);
    font-size: 0.85rem;
}

/* ── 문제내기(quiz) 스타일 ── */

.quiz-post-form {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    border: 2px solid var(--primary-color);
}

.quiz-post-form .form-group {
    margin-bottom: 12px;
}

.quiz-post-form .form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    resize: vertical;
}

.quiz-post-form .form-control:focus {
    border-color: var(--primary-color);
}

.quiz-answer-hint {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--text-muted-color);
    margin-bottom: 8px;
}

.quiz-answer-hint .material-icons {
    font-size: 16px;
    color: #f9a825;
}

.quiz-item {
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}

.quiz-item:last-child {
    border-bottom: none;
}

.quiz-item-header {
    margin-bottom: 8px;
}

.quiz-item-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

.quiz-item-meta {
    font-size: 0.78rem;
    color: var(--text-muted-color);
    margin-top: 2px;
}

.quiz-item-body {
    font-size: 0.92rem;
    color: var(--text-secondary-color);
    line-height: 1.6;
    margin-bottom: 12px;
    padding: 12px;
    background: var(--surface-alt-color);
    border-radius: 8px;
}

.quiz-official-answer {
    background: var(--tint-amber-bg);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 10px;
}

.quiz-official-answer-header {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 0.88rem;
    color: #e65100;
    margin-bottom: 6px;
}

.quiz-official-answer-header .material-icons {
    font-size: 18px;
}

.quiz-answers {
    margin-bottom: 10px;
}

.quiz-answer-item {
    padding: 10px 12px;
    border-left: 3px solid var(--border-color);
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary-color);
}

.quiz-answer-item--mine {
    border-left-color: var(--primary-color);
    background: var(--tint-orange-bg);
}

.quiz-answer-item strong {
    font-size: 0.85rem;
    color: var(--text-color);
}

.quiz-answer-form {
    background: var(--surface-alt-color);
    border-radius: 8px;
    padding: 14px;
}

.quiz-answer-form .form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    resize: vertical;
}

.quiz-answer-form .form-control:focus {
    border-color: var(--primary-color);
}

.quiz-answer-prompt {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--text-muted-color);
    margin: 0 0 10px;
}

.quiz-answer-prompt .material-icons {
    font-size: 16px;
    color: var(--primary-color);
}

.quiz-answer-prompt-readonly {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-muted-color);
    padding: 10px 0 0;
}

.quiz-answer-prompt-readonly .material-icons {
    font-size: 16px;
    color: var(--text-muted-color);
}

/* ── 챌린지 사진 인증 ── */

.challenge-image-upload {
    margin-bottom: 10px;
}

.challenge-image-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px;
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    background: var(--surface-alt-color);
    color: var(--text-muted-color);
    font-size: 0.92rem;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
}

.challenge-image-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.challenge-image-btn .material-icons {
    font-size: 22px;
}

.challenge-image-preview {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    background: #000;
}

.challenge-image-preview img {
    display: block;
    width: 100%;
    max-height: 300px;
    object-fit: contain;
    border-radius: 10px;
}

.challenge-image-remove {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.challenge-image-remove:hover {
    background: rgba(0, 0, 0, 0.8);
}

.challenge-image-remove .material-icons {
    font-size: 20px;
}

/* 인증 로그 이미지 */
.challenge-log-image {
    margin: 8px 0;
    border-radius: 8px;
    overflow: hidden;
}

.challenge-log-image img {
    display: block;
    width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.2s;
    background: var(--surface-alt-color);
}

.challenge-log-image img:hover {
    opacity: 0.9;
}

/* 사진 인증 그리드 */
.challenge-photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
}

.challenge-photo-card {
    background: var(--surface-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

.challenge-photo-card .challenge-log-image {
    margin: 0;
    border-radius: 0;
}

.challenge-photo-card .challenge-log-image img {
    border-radius: 0;
    max-height: 260px;
    width: 100%;
    object-fit: cover;
}

.challenge-photo-card-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px 4px;
    font-size: 0.88rem;
}

.challenge-photo-card .challenge-log-content {
    padding: 0 12px 10px;
    font-size: 0.85rem;
    color: var(--text-secondary-color);
}

/* 빠른 인증 사진 버튼 */
.challenge-quick-photo-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-muted-color);
    flex-shrink: 0;
    transition: color 0.2s, background 0.2s;
}

.challenge-quick-photo-btn:hover {
    color: var(--primary-color);
    background: var(--primary-light);
}

.challenge-quick-photo-btn--required {
    color: var(--primary-color);
}

.challenge-quick-photo-btn .material-icons {
    font-size: 22px;
}

.quick-photo-name {
    display: block;
    font-size: 0.78rem;
    color: var(--primary-color);
    padding: 0 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}