/* ============================================================
   金牛论坛 - 设计系统 v1.0
   主色: #C2B59B | 白: #FFFFFF | 灰: #ADADAD
   风格: 极简扁平超细线(stroke-width:1) | 黄金比例φ=1.618
   ============================================================ */

:root {
    --color-primary: #C2B59B;
    --color-primary-light: #D4C9B4;
    --color-primary-dark: #A89B7E;
    --color-white: #FFFFFF;
    --color-gray: #ADADAD;
    --color-gray-light: #F5F4F2;
    --color-gray-dark: #6B6B6B;
    --color-text: #2D2D2D;
    --color-text-secondary: #6B6B6B;
    --color-border: #E8E5E0;
    --color-bg: #FAFAF8;
    --color-card: #FFFFFF;
    --color-success: #67C23A;
    --color-danger: #F56C6C;
    --color-warning: #E6A23C;
    --color-info: #4A90D9;

    --font-base: 15px;
    --font-sm: 13px;
    --font-lg: 18px;
    --font-xl: 24px;
    --font-xxl: 32px;
    --line-height: 1.618;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
    --shadow-primary: 0 4px 14px rgba(194,181,155,0.3);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);

    --phi: 1.618;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 40px;
    --space-xxl: 64px;
}

/* 暗黑模式 */
[data-theme="dark"] {
    --color-text: #E8E5E0;
    --color-text-secondary: #A0A0A0;
    --color-border: #3A3A3A;
    --color-bg: #1A1A1A;
    --color-card: #242424;
    --color-gray-light: #2A2A2A;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.4);
}

/* ============ 基础重置 ============ */
* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: var(--font-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

/* ============ 导航栏 ============ */
.bbs-navbar {
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
    padding: 10px 0;
    z-index: 1000;
}

.brand-text {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: 1px;
}

.logo-main { border-radius: var(--radius-sm); }

.bbs-navbar .nav-link {
    color: var(--color-text-secondary);
    font-size: var(--font-sm);
    padding: 8px 14px;
    border-radius: var(--radius-full);
    transition: var(--transition);
    position: relative;
}
.bbs-navbar .nav-link:hover,
.bbs-navbar .nav-link.active {
    color: var(--color-primary-dark);
    background: rgba(194,181,155,0.1);
}
.bbs-navbar .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

/* 搜索框 */
.search-form { position: relative; }
.search-input {
    width: 180px;
    padding: 6px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    background: var(--color-gray-light);
    transition: var(--transition);
}
.search-input:focus {
    width: 240px;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(194,181,155,0.15);
    outline: none;
}

/* 图标按钮 */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}
.btn-icon:hover {
    background: rgba(194,181,155,0.12);
    color: var(--color-primary-dark);
    transform: scale(1.05);
}
.btn-icon:active { transform: scale(0.95); }

/* 主题切换图标 */
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

/* 通知徽章 */
.notification-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    font-size: 10px;
    font-weight: 600;
    color: #fff;
    background: var(--color-danger);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse-badge 2s infinite;
}

/* 按钮 */
.btn-primary {
    background: var(--color-primary);
    border: none;
    color: #fff;
    font-size: var(--font-sm);
    font-weight: 500;
    padding: 8px 18px;
    border-radius: var(--radius-full);
    transition: var(--transition);
    box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(194,181,155,0.4);
}
.btn-primary:active { transform: translateY(0) scale(0.97); }

.btn-create { display: flex; align-items: center; gap: 6px; }
.btn-login { display: flex; align-items: center; gap: 6px; }

/* 头像 */
.btn-avatar {
    border: none;
    background: none;
    padding: 0;
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: var(--transition);
}
.btn-avatar:hover { transform: scale(1.08); box-shadow: 0 0 0 3px rgba(194,181,155,0.3); }
.btn-avatar::after { display: none; }

.avatar-sm { width: 32px; height: 32px; border-radius: var(--radius-full); object-fit: cover; }
.avatar-md { width: 42px; height: 42px; border-radius: var(--radius-full); object-fit: cover; }
.avatar-lg { width: 64px; height: 64px; border-radius: var(--radius-full); object-fit: cover; }
.avatar-xl { width: 96px; height: 96px; border-radius: var(--radius-full); object-fit: cover; }

/* ============ 主内容区 ============ */
.main-content {
    min-height: calc(100vh - 200px);
    padding: var(--space-lg) 0;
}

/* ============ 卡片 ============ */
.bbs-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    transition: var(--transition);
    animation: fadeInUp 0.4s ease-out;
}
.bbs-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

/* 帖子卡片 */
.topic-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    transition: var(--transition);
    cursor: pointer;
    animation: fadeInUp 0.4s ease-out both;
}
.topic-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
    transform: translateY(-2px);
}
.topic-card:active { transform: translateY(0) scale(0.995); }

.topic-title {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.topic-title:hover { color: var(--color-primary-dark); }

.topic-excerpt {
    font-size: var(--font-sm);
    color: var(--color-text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--space-md);
}

.topic-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 12px;
    color: var(--color-gray);
}
.topic-meta .meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 帖子图片网格 */
.topic-images {
    display: grid;
    gap: 6px;
    margin: var(--space-md) 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.topic-images.count-1 { grid-template-columns: 1fr; max-width: 400px; }
.topic-images.count-2 { grid-template-columns: 1fr 1fr; }
.topic-images.count-3 { grid-template-columns: 1fr 1fr 1fr; }
.topic-images.count-4 { grid-template-columns: 1fr 1fr; }
.topic-images.count-5,
.topic-images.count-6 { grid-template-columns: 1fr 1fr 1fr; }
.topic-images.count-7,
.topic-images.count-8,
.topic-images.count-9 { grid-template-columns: 1fr 1fr 1fr; }

.topic-images .img-wrapper {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    border-radius: var(--radius-sm);
}
.topic-images .img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.topic-images .img-wrapper:hover img { transform: scale(1.05); }
.topic-images .img-more {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-lg);
    font-weight: 600;
}

/* 类型标签 */
.type-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    font-size: 11px;
    font-weight: 500;
    border-radius: var(--radius-full);
    color: #fff;
}

/* 置顶/精华标记 */
.badge-top, .badge-essence {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 2px 8px;
    font-size: 11px;
    border-radius: var(--radius-full);
    font-weight: 500;
}
.badge-top { background: rgba(245,108,108,0.1); color: var(--color-danger); }
.badge-essence { background: rgba(194,181,155,0.15); color: var(--color-primary-dark); }

/* ============ 侧边栏 ============ */
.sidebar-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
}
.sidebar-title {
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ============ 页脚 ============ */
.bbs-footer {
    background: var(--color-card);
    border-top: 1px solid var(--color-border);
    font-size: var(--font-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-xxl);
}
.bbs-footer a { color: var(--color-text-secondary); }
.bbs-footer a:hover { color: var(--color-primary); }
.footer-desc { font-size: 12px; color: var(--color-gray); }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; justify-content: flex-end; }
.footer-links a { font-size: 12px; }

/* ============ Cookie同意 ============ */
.cookie-consent {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-card);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
    z-index: 9999;
    animation: slideUp 0.5s ease-out;
}
.cookie-text {
    font-size: var(--font-sm);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ============ Toast通知 ============ */
.toast-success {
    background: var(--color-card);
    border: 1px solid var(--color-success);
    border-radius: var(--radius-md);
    color: var(--color-success);
    box-shadow: var(--shadow-lg);
}
.toast-error {
    background: var(--color-card);
    border: 1px solid var(--color-danger);
    border-radius: var(--radius-md);
    color: var(--color-danger);
    box-shadow: var(--shadow-lg);
}

/* ============ 动画系统 ============ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes slideDown {
    from { opacity: 0; transform: translate(-50%, -20px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}
@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
    20%, 40%, 60%, 80% { transform: translateX(4px); }
}
@keyframes pulse-badge {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}
@keyframes bounceIn {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.05); }
    70% { transform: scale(0.9); }
    100% { transform: scale(1); opacity: 1; }
}
@keyframes ripple {
    to { transform: scale(4); opacity: 0; }
}
@keyframes heartBeat {
    0% { transform: scale(1); }
    25% { transform: scale(1.3); }
    50% { transform: scale(1); }
    75% { transform: scale(1.2); }
    100% { transform: scale(1); }
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

.animate-slideDown { animation: slideDown 0.4s ease-out; }
.animate-shake { animation: shake 0.5s ease-in-out; }
.animate-bounceIn { animation: bounceIn 0.5s ease-out; }
.animate-heartBeat { animation: heartBeat 0.6s ease-in-out; }
.animate-fadeIn { animation: fadeIn 0.3s ease-out; }

/* 按钮涟漪效果 */
.btn-ripple {
    position: relative;
    overflow: hidden;
}
.btn-ripple .ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

/* 点赞动画 */
.like-active { animation: heartBeat 0.6s ease-in-out; color: var(--color-danger) !important; }

/* 加载动画 */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ============ 表单 ============ */
.form-control, .form-select {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-base);
    padding: 10px 14px;
    transition: var(--transition);
    background: var(--color-card);
    color: var(--color-text);
}
.form-control:focus, .form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(194,181,155,0.15);
    outline: none;
}
.form-control.is-invalid {
    border-color: var(--color-danger);
    animation: shake 0.4s ease-in-out;
}
.invalid-feedback { color: var(--color-danger); font-size: 12px; }

/* 错误提示动画 */
.error-shake { animation: shake 0.5s ease-in-out; }

/* ============ 分页 ============ */
.pagination .page-link {
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: var(--font-sm);
    padding: 6px 12px;
    transition: var(--transition);
}
.pagination .page-link:hover {
    background: rgba(194,181,155,0.1);
    border-color: var(--color-primary-light);
    color: var(--color-primary-dark);
}
.pagination .active .page-link {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

/* ============ 回复区 ============ */
.reply-item {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
    animation: fadeInUp 0.3s ease-out both;
}
.reply-item:last-child { border-bottom: none; }
.reply-content { font-size: var(--font-base); line-height: var(--line-height); }
.reply-children {
    margin-left: var(--space-xl);
    padding-left: var(--space-md);
    border-left: 2px solid var(--color-border);
}

/* 楼层号 */
.floor-num {
    font-size: 11px;
    color: var(--color-gray);
    background: var(--color-gray-light);
    padding: 1px 8px;
    border-radius: var(--radius-full);
}

/* ============ 图片上传区 ============ */
.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--color-gray-light);
}
.upload-area:hover, .upload-area.dragover {
    border-color: var(--color-primary);
    background: rgba(194,181,155,0.05);
}
.upload-preview {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: var(--space-md);
}
.upload-preview .preview-item {
    position: relative;
    aspect-ratio: 4/3;
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.upload-preview .preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.upload-preview .preview-remove {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 22px;
    height: 22px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}
.upload-preview .preview-remove:hover { background: var(--color-danger); transform: scale(1.1); }

/* ============ 响应式 ============ */
@media (max-width: 991px) {
    .search-form { display: none !important; }
    .topic-images.count-3 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
    :root { --font-base: 14px; --font-lg: 16px; }
    .main-content { padding: var(--space-md) 0; }
    .topic-card { padding: var(--space-md); }
    .bbs-card { padding: var(--space-md); }
    .topic-images.count-4,
    .topic-images.count-5,
    .topic-images.count-6,
    .topic-images.count-7,
    .topic-images.count-8,
    .topic-images.count-9 { grid-template-columns: 1fr 1fr 1fr; }
    .footer-links { justify-content: center; }
}
@media (max-width: 320px) {
    .topic-images { grid-template-columns: 1fr 1fr !important; }
    .btn-create span, .btn-login span { display: none; }
}

/* ============ 滚动条美化 ============ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-gray); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

/* ============ 下拉菜单 ============ */
.dropdown-menu {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 6px;
    animation: fadeInUp 0.2s ease-out;
}
.dropdown-item {
    font-size: var(--font-sm);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.dropdown-item:hover { background: rgba(194,181,155,0.1); }

/* ============ 统计数字 ============ */
.stat-number {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--color-primary-dark);
    line-height: 1.2;
}
.stat-label {
    font-size: 12px;
    color: var(--color-gray);
}

/* ============ 空状态 ============ */
.empty-state {
    text-align: center;
    padding: var(--space-xxl) var(--space-lg);
    color: var(--color-gray);
}
.empty-state svg { margin-bottom: var(--space-md); opacity: 0.5; }