:root {
    --primary-color: #4a6fa5;
    --secondary-color: #6b8e23;
    --accent-color: #ff6b6b;
    --background-color: #f5f7fa;
    --card-bg-color: #ffffff;
    --text-color: #333333;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --lv1-color: #808080;
    --lv5-color: #4caf50;
    --lv10-color: #2196f3;
    --lv20-color: #9c27b0;
    --lv30-color: #ff9800;
    --lv50-color: #e91e63;
    --lv50ex-color: #ff00ff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 15px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.main-nav ul {
    display: flex;
    list-style: none;
}

.main-nav li {
    margin-left: 25px;
}

.main-nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 5px 10px;
    border-radius: 4px;
}

.main-nav a:hover, .main-nav a.active {
    background-color: rgba(255, 255, 255, 0.2);
}

.user-actions {
    display: flex;
    align-items: center;
}

.user-profile {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
}

.user-name {
    margin-right: 5px;
    font-weight: 500;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: white;
    color: var(--text-color);
    min-width: 150px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    display: none;
    z-index: 100;
}

.user-profile:hover .user-dropdown {
    display: block;
}

.user-dropdown a {
    display: block;
    padding: 10px 15px;
    text-decoration: none;
    color: var(--text-color);
    transition: background-color 0.3s;
}

.user-dropdown a:hover {
    background-color: var(--background-color);
}

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.login-btn {
    background-color: transparent;
    color: white;
    border: 1px solid white;
    margin-right: 10px;
}

.login-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

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

.register-btn:hover {
    background-color: #5a7d1c;
}

.sign-in-btn {
    background-color: var(--success-color);
    color: white;
    margin-top: 10px;
    padding: 6px 12px;
    font-size: 0.9rem;
}

.sign-in-btn:hover {
    background-color: #218838;
}

.sign-in-btn.signed-in {
    background-color: var(--text-secondary);
    cursor: not-allowed;
}

main {
    padding: 30px 0;
}

.welcome-section {
    text-align: center;
    padding: 40px 0;
    margin-bottom: 30px;
    background: linear-gradient(to right, rgba(74, 111, 165, 0.1), rgba(107, 142, 35, 0.1));
    border-radius: 8px;
}

.welcome-section h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.welcome-section p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

section h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 8px;
    display: inline-block;
}

.post-grid, .gold-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.post-card, .gold-card {
    background-color: var(--card-bg-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 20px;
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.post-card:hover, .gold-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.post-title, .gold-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.post-content, .gold-content {
    color: var(--text-secondary);
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-meta, .gold-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.post-author, .gold-author {
    display: flex;
    align-items: center;
}

.author-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    margin-right: 8px;
    object-fit: cover;
}

.post-actions, .gold-actions {
    display: flex;
    align-items: center;
}

.action-icon {
    margin-left: 10px;
    display: flex;
    align-items: center;
}

.action-icon i {
    margin-right: 5px;
}

.like-icon {
    color: var(--accent-color);
}

.comment-icon {
    color: var(--secondary-color);
}

.gold-reward {
    color: var(--warning-color);
    font-weight: 600;
    margin-top: 10px;
    display: flex;
    align-items: center;
}

.gold-reward i {
    margin-right: 5px;
}

.gold-status {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-top: 10px;
}

.status-pending {
    background-color: var(--warning-color);
    color: white;
}

.status-completed {
    background-color: var(--success-color);
    color: white;
}

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 50px;
}

.recharge-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--card-bg-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.user-balance {
    margin-bottom: 20px;
    padding: 15px;
    background-color: rgba(74, 111, 165, 0.1);
    border-radius: 4px;
}

.recharge-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.recharge-option {
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.recharge-option:hover {
    border-color: var(--primary-color);
}

.recharge-option.selected {
    border-color: var(--primary-color);
    background-color: rgba(74, 111, 165, 0.1);
}

.recharge-amount {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.recharge-price {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.payment-methods {
    margin-bottom: 30px;
}

.payment-method {
    display: inline-block;
    padding: 10px 20px;
    margin-right: 15px;
    margin-bottom: 10px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.payment-method:hover {
    border-color: var(--primary-color);
}

.payment-method.selected {
    border-color: var(--primary-color);
    background-color: rgba(74, 111, 165, 0.1);
}

.recharge-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.recharge-btn:hover {
    background-color: #3a5a8a;
}

.recharge-btn:disabled {
    background-color: var(--text-secondary);
    cursor: not-allowed;
}

/* 商店页面样式 */
.store-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--card-bg-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.store-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.filter-btn {
    padding: 8px 16px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

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

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

.store-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.loading-skeleton {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.skeleton-item {
    height: 300px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 8px;
}

.no-data, .error-message {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
}

.error-message {
    color: var(--danger-color);
}

.store-item-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.store-item-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.item-card-image {
    height: 150px;
    overflow: hidden;
}

.item-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.store-item-card:hover .item-card-image img {
    transform: scale(1.05);
}

.item-card-content {
    padding: 15px;
}

.item-card-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.item-card-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.item-card-price {
    font-size: 1rem;
    font-weight: 600;
    color: var(--warning-color);
    margin-bottom: 15px;
}

.buy-btn {
    width: 100%;
    padding: 8px 0;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.buy-btn:hover {
    background-color: #3a5a8a;
}

/* 悬赏页面样式 */
.gold-task-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--card-bg-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0;
}

.create-btn {
    background-color: var(--secondary-color);
    color: white;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.create-btn:hover {
    background-color: #5a7d1c;
}

.task-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.search-bar {
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 250px;
}

.search-bar input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px 0 0 4px;
    font-size: 1rem;
}

.search-btn {
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s;
}

.search-btn:hover {
    background-color: #3a5a8a;
}

.filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.task-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.skeleton-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 20px;
}

.skeleton-line {
    height: 20px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    margin-bottom: 15px;
    border-radius: 4px;
}

.skeleton-line.short {
    width: 60%;
}

.skeleton-line.half {
    width: 80%;
}

.skeleton-footer {
    display: flex;
    justify-content: space-between;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.pagination button {
    padding: 8px 12px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

.pagination button:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .header-container {
        flex-direction: column;
    }

    .logo {
        margin-bottom: 15px;
    }

    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .main-nav li {
        margin: 5px 10px;
    }

    .user-actions {
        margin-top: 15px;
    }
}

@media (max-width: 768px) {
    .post-grid, .gold-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 576px) {
    .welcome-section h2 {
        font-size: 1.6rem;
    }

    .welcome-section p {
        font-size: 1rem;
    }

    section h3 {
        font-size: 1.3rem;
    }

    .post-grid, .gold-grid {
        grid-template-columns: 1fr;
    }
}

/* 个人中心页面样式 */
.profile-container {
    max-width: 1000px;
    margin: 30px auto;
    background-color: var(--card-bg-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.profile-header {
    display: flex;
    padding: 20px;
    background-color: rgba(74, 111, 165, 0.1);
    border-bottom: 1px solid var(--border-color);
}

.profile-avatar-container {
    position: relative;
    margin-right: 20px;
}

.profile-avatar-container img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 4px solid white;
    object-fit: cover;
}

.profile-level-badge {
    position: absolute;
    bottom: 0;
    right: 0;
    background-color: var(--primary-color);
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 12px;
    border: 2px solid white;
}

.profile-info {
    flex: 1;
}

.profile-info h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.profile-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 15px;
}

.stat-item {
    flex: 1;
    min-width: 120px;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.exp-bar {
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 5px;
}

.exp-progress {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 4px;
}

.profile-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: 15px 20px;
    background-color: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.tab-btn:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

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

.profile-tab-content {
    padding: 20px;
}

.hidden {
    display: none;
}

.profile-details {
    margin-bottom: 20px;
}

.detail-item {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.detail-label {
    display: inline-block;
    width: 100px;
    font-weight: 500;
    color: var(--text-secondary);
}

.skeleton-post-item {
    height: 120px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 4px;
    margin-bottom: 15px;
}

.profile-settings .form-group {
    margin-bottom: 20px;
}

.profile-settings label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.profile-settings input,
.profile-settings textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.profile-settings textarea {
    resize: vertical;
}

.name-change-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

.save-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.save-btn:hover {
    background-color: #3a5a8a;
}