/* 全局样式 */
:root {
    --primary-color: #6f42c1; /* 主色调 - 紫色 */
    --secondary-color: #ff6b6b; /* 次要色调 - 珊瑚红 */
    --dark-color: #343a40; /* 深色 */
    --light-color: #f8f9fa; /* 浅色 */
    --success-color: #28a745; /* 成功色 */
    --danger-color: #dc3545; /* 危险色 */
    --warning-color: #fd7e14; /* 警告色 */
    --info-color: #17a2b8; /* 信息色 */
    --border-radius: 0.375rem; /* 边框圆角 */
    --box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15); /* 盒子阴影 */
    --transition: all 0.3s ease; /* 过渡效果 */
}

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

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

/* 工具类 */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--secondary-color) !important; }

.rounded { border-radius: var(--border-radius) !important; }
.shadow { box-shadow: var(--box-shadow) !important; }

/* 布局 */
.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container { max-width: 540px; }
}

@media (min-width: 768px) {
    .container { max-width: 720px; }
}

@media (min-width: 992px) {
    .container { max-width: 960px; }
}

@media (min-width: 1200px) {
    .container { max-width: 1140px; }
}

/* 导航栏 */
.navbar {
    padding: 0.75rem 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.navbar-dark {
    background-color: var(--dark-color) !important;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.8);
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: white;
}

/* 卡片样式 */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.15);
}

.card-img-top {
    width: 100%;
    object-fit: cover;
}

.card-body {
    padding: 1.25rem;
}

.card-title {
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.card-footer {
    padding: 0.75rem 1.25rem;
    background-color: rgba(0, 0, 0, 0.03);
    border-top: 1px solid rgba(0, 0, 0, 0.125);
}

/* 图片网格 */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem 0;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.gallery-item:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: var(--transition);
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-item .overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    color: white;
    padding: 1rem;
    opacity: 0;
    transition: var(--transition);
}

.gallery-item:hover .overlay {
    opacity: 1;
}

/* 标签云 */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: #e9ecef;
    border-radius: 50rem;
    font-size: 0.875rem;
    transition: var(--transition);
}

.tag:hover {
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
}

/* 评分 */
.rating {
    color: #ffc107;
    font-size: 0.9rem;
}

.rating-input {
    direction: rtl;
    unicode-bidi: bidi-override;
}

.rating-input input {
    display: none;
}

.rating-input label {
    font-size: 1.5rem;
    color: #ddd;
    cursor: pointer;
    padding: 0 0.25rem;
}

.rating-input input:checked ~ label,
.rating-input label:hover,
.rating-input label:hover ~ label {
    color: #ffc107;
}

/* 按钮 */
.btn {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background-color: #5a32a3;
    border-color: #5a32a3;
}

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

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

/* 表单 */
.form-control {
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius);
    border: 1px solid #ced4da;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(111, 66, 193, 0.25);
}

/* 页脚 */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 3rem 0;
    margin-top: auto;
}

footer a {
    color: rgba(255, 255, 255, 0.7);
}

footer a:hover {
    color: white;
    text-decoration: none;
}

.social-icons a {
    display: inline-block;
    width: 36px;
    height: 36px;
    line-height: 36px;
    text-align: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    margin-right: 0.5rem;
}

.social-icons a:hover {
    background-color: var(--primary-color);
}

/* 登录/注册表单 */
.auth-container {
    max-width: 400px;
    margin: 2rem auto;
}

.auth-card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.auth-card .card-body {
    padding: 2rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .gallery {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
    
    .gallery-item img {
        height: 200px;
    }
}

@media (max-width: 576px) {
    .gallery {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    .gallery-item img {
        height: 150px;
    }
    
    .auth-card .card-body {
        padding: 1.5rem;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #5a32a3;
}

/* 加载动画 */
.loader {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    border: 0.25rem solid rgba(111, 66, 193, 0.2);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 模态框 */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.2);
}

/* 分页 */
.pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.pagination .page-link {
    color: var(--primary-color);
}

/* 工具提示 */
.tooltip-inner {
    background-color: var(--dark-color);
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

.bs-tooltip-auto[data-popper-placement^=top] .tooltip-arrow::before,
.bs-tooltip-top .tooltip-arrow::before {
    border-top-color: var(--dark-color);
}

/* 面包屑导航 */
.breadcrumb {
    background-color: transparent;
    padding: 0;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "›";
}

/* 消息提示 */
.alert {
    border-radius: var(--border-radius);
    border: none;
}

.alert-dismissible .btn-close {
    padding: 0.5rem;
}

/* 图片详情页 */
.image-detail {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.image-meta {
    padding: 1.5rem;
}

.image-meta h2 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.image-meta .meta-item {
    margin-bottom: 0.75rem;
}

.image-meta .meta-label {
    font-weight: 600;
    color: var(--dark-color);
    display: inline-block;
    width: 80px;
}

/* 评论区域 */
.comment-list {
    margin-top: 2rem;
}

.comment-item {
    padding: 1rem;
    border-radius: var(--border-radius);
    background-color: white;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    margin-bottom: 1rem;
}

.comment-author {
    display: flex;
    align-items: center;
    margin-bottom: 0.75rem;
}

.comment-author img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 0.75rem;
}

.comment-author .author-name {
    font-weight: 600;
    margin-bottom: 0;
}

.comment-author .comment-date {
    font-size: 0.875rem;
    color: #6c757d;
}

.comment-content {
    padding-left: 55px;
}

/* 响应式图片 */
.img-fluid {
    max-width: 100%;
    height: auto;
}

.img-thumbnail {
    padding: 0.25rem;
    background-color: #fff;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    max-width: 100%;
    height: auto;
}