/* ===== 基础变量与重置 ===== */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius: 16px;
    --radius-sm: 10px;
    --header-height: 64px;
    --tags-height: 60px;
}

/* 亮色主题 */
body.light-mode {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --overlay-bg: rgba(0, 0, 0, 0.5);
    --card-bg: #ffffff;
    --tag-bg: #f1f5f9;
    --tag-active-bg: #667eea;
    --tag-active-text: #ffffff;
}

/* 暗色主题 */
body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --overlay-bg: rgba(0, 0, 0, 0.8);
    --card-bg: #1e293b;
    --tag-bg: #334155;
    --tag-active-bg: #818cf8;
    --tag-active-text: #0f172a;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: var(--transition);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.hidden {
    display: none !important;
}

/* ===== 顶部导航 ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo svg {
    stroke: url(#logoGradient);
}

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

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow);
}

/* 主题切换图标 */
body.light-mode .moon-icon { display: block; }
body.light-mode .sun-icon { display: none; }
body.dark-mode .sun-icon { display: block; }
body.dark-mode .moon-icon { display: none; }

/* ===== 搜索弹窗 ===== */
.search-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
}

.search-modal:not(.hidden) {
    transform: translateY(0);
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    gap: 12px;
    align-items: center;
}

#searchInput {
    flex: 1;
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: var(--transition);
}

#searchInput:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

/* ===== 标签分类 ===== */
.tags-section {
    position: sticky;
    top: var(--header-height);
    z-index: 90;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.tags-wrapper {
    overflow-x: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.tags-wrapper::-webkit-scrollbar {
    display: none;
}

.tags-container {
    display: flex;
    gap: 10px;
    padding: 14px 0;
    min-width: max-content;
}

.tag-btn {
    padding: 8px 18px;
    border: none;
    border-radius: 999px;
    background-color: var(--tag-bg);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
}

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

.tag-btn.active {
    background: var(--primary-gradient);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.35);
}

/* ===== 主内容区 ===== */
.main {
    padding: 32px 0 60px;
    min-height: calc(100vh - var(--header-height) - var(--tags-height) - 80px);
}

/* 加载状态 */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 20px;
}

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

/* 空状态 */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    color: var(--text-secondary);
    text-align: center;
}

.empty-state svg {
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
    margin-bottom: 24px;
}

/* 卡片网格 - 瀑布流布局 */
.cards-grid {
    column-count: 4;
    column-gap: 20px;
}

.card {
    break-inside: avoid;
    margin-bottom: 20px;
    background-color: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transition: var(--transition);
    animation: fadeInUp 0.5s ease both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

.card-image-wrapper {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.card-image {
    width: 100%;
    display: block;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.card-quote-overlay {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 40px 20px 20px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.85), transparent);
    color: #ffffff;
}

.card-quote {
    font-size: 14px;
    line-height: 1.6;
    font-weight: 500;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-author {
    margin-top: 8px;
    font-size: 12px;
    opacity: 0.85;
    font-style: italic;
}

.card-footer {
    padding: 14px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.card-tag {
    padding: 3px 10px;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 12px;
    border-radius: 999px;
}

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

.card-action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.card-action-btn:hover {
    background-color: #667eea;
    color: #ffffff;
}

/* 加载更多 */
.load-more-container {
    text-align: center;
    margin-top: 40px;
    padding: 20px 0;
}

/* 按钮通用样式 */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(102, 126, 234, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.45);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
}

/* ===== 预览模态框 ===== */
.preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.preview-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--overlay-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.preview-content {
    position: relative;
    max-width: 900px;
    width: 100%;
    max-height: 92vh;
    background-color: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.preview-close {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 10;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.5);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.preview-close:hover {
    background-color: rgba(0, 0, 0, 0.75);
    transform: rotate(90deg);
}

.preview-image-wrapper {
    position: relative;
    flex: 1;
    min-height: 0;
    overflow: hidden;
    background-color: var(--bg-tertiary);
}

#previewImage {
    width: 100%;
    height: 100%;
    max-height: 55vh;
    object-fit: contain;
    display: block;
}

.preview-quote-overlay {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 60px 32px 32px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    color: #ffffff;
}

#previewQuote {
    font-size: 18px;
    line-height: 1.7;
    font-weight: 500;
    margin: 0;
}

#previewQuote::before {
    content: '\201C';
    font-size: 40px;
    line-height: 0;
    margin-right: 8px;
    vertical-align: -15px;
    opacity: 0.6;
}

#previewAuthor {
    display: block;
    margin-top: 12px;
    font-size: 14px;
    opacity: 0.85;
    font-style: italic;
}

#previewAuthor::before {
    content: '—— ';
}

.preview-info {
    padding: 24px 32px;
    border-top: 1px solid var(--border-color);
}

.preview-meta {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 20px;
}

.preview-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.preview-tags .card-tag {
    padding: 6px 14px;
    font-size: 13px;
}

.preview-resolution {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.preview-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.preview-actions .btn-primary,
.preview-actions .btn-secondary {
    flex: 1;
    min-width: 160px;
}

/* ===== Toast 提示 ===== */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 12px 24px;
    background-color: var(--text-primary);
    color: var(--bg-primary);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    z-index: 999;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
}

.toast:not(.hidden) {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background-color: #10b981;
    color: #ffffff;
}

.toast.error {
    background-color: #ef4444;
    color: #ffffff;
}

/* ===== 页脚 ===== */
.footer {
    padding: 24px 0;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.footer p {
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.8;
}

/* ===== 响应式适配 ===== */

/* 平板 */
@media (max-width: 1200px) {
    .cards-grid {
        column-count: 3;
    }
}

@media (max-width: 900px) {
    .cards-grid {
        column-count: 2;
    }

    .preview-quote-overlay {
        padding: 48px 24px 24px;
    }

    #previewQuote {
        font-size: 16px;
    }

    .preview-info {
        padding: 20px 24px;
    }
}

/* 手机 */
@media (max-width: 600px) {
    .container {
        padding: 0 16px;
    }

    .header-inner {
        height: 56px;
    }

    .logo span {
        font-size: 18px;
    }

    :root {
        --header-height: 56px;
    }

    .cards-grid {
        column-count: 1;
        column-gap: 16px;
    }

    .card {
        margin-bottom: 16px;
    }

    .main {
        padding: 20px 0 40px;
    }

    .tags-container {
        padding: 12px 0;
        gap: 8px;
    }

    .tag-btn {
        padding: 7px 16px;
        font-size: 13px;
    }

    .preview-modal {
        padding: 0;
    }

    .preview-content {
        max-height: 100vh;
        height: 100vh;
        border-radius: 0;
    }

    #previewImage {
        max-height: 50vh;
    }

    .preview-quote-overlay {
        padding: 40px 20px 20px;
    }

    #previewQuote {
        font-size: 15px;
        line-height: 1.6;
    }

    #previewQuote::before {
        font-size: 32px;
        vertical-align: -12px;
    }

    .preview-info {
        padding: 16px 20px;
    }

    .preview-actions {
        flex-direction: column;
    }

    .preview-actions .btn-primary,
    .preview-actions .btn-secondary {
        width: 100%;
    }

    .card-quote {
        font-size: 13px;
        -webkit-line-clamp: 4;
    }

    .empty-state,
    .loading-state {
        padding: 60px 20px;
    }
}

/* 超小屏 */
@media (max-width: 380px) {
    .logo span {
        font-size: 16px;
    }

    .card-footer {
        padding: 12px 14px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .card-actions {
        align-self: flex-end;
    }
}

/* 打印样式 */
@media print {
    .header, .tags-section, .footer, .header-actions,
    .preview-actions, .preview-close, .card-actions {
        display: none !important;
    }
}