/* CSS 变量 - 亮色模式 */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f7fa;
    --bg-card: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #546e7a;
    --border-color: #e0e6ed;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
    --accent: #3498db;
    --accent-hover: #2980b9;
    --tag-bg: #e3f2fd;
    --tag-text: #1565c0;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 暗色模式 */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #0f0f0f;
    --bg-card: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.4);
    --accent: #64b5f6;
    --accent-hover: #42a5f5;
    --tag-bg: #1e3a5f;
    --tag-text: #90caf9;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

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

/* Header */
.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle:hover {
    border-color: var(--accent);
    transform: scale(1.05);
}

[data-theme="light"] .icon-dark,
[data-theme="dark"] .icon-light {
    display: none;
}

/* Controls */
.controls {
    margin: 2rem 0;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 250px;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

/* Tag Filter */
.tag-filter {
    position: relative;
}

.tag-filter-toggle {
    padding: 0.75rem 1.5rem;
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    white-space: nowrap;
}

.tag-filter-toggle:hover {
    border-color: var(--accent);
}

.tag-count {
    background-color: var(--accent);
    color: white;
    border-radius: 12px;
    padding: 0.1rem 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
}

.tag-filter-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-hover);
    min-width: 250px;
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 50;
}

.tag-filter-dropdown.active {
    display: block;
}

.tag-filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.tag-clear {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0.25rem 0.5rem;
}

.tag-clear:hover {
    text-decoration: underline;
}

.tag-list {
    padding: 0.5rem;
}

.tag-checkbox {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
}

.tag-checkbox:hover {
    background-color: var(--bg-secondary);
}

.tag-checkbox input {
    margin-right: 0.5rem;
    cursor: pointer;
}

.tag-checkbox label {
    cursor: pointer;
    flex: 1;
}

/* Collections Grid */
.collections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* Collection Card */
.collection-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

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

.card-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.card-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.card-icon img {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    object-fit: cover;
}

.card-title-wrapper {
    flex: 1;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.card-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tag {
    background-color: var(--tag-bg);
    color: var(--tag-text);
    padding: 0.25rem 0.75rem;
    border-radius: 16px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Expanded Detail */
.collection-detail {
    grid-column: 1 / -1;
    background-color: var(--bg-card);
    border: 2px solid var(--accent);
    border-radius: 12px;
    padding: 2rem;
    margin-top: -1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-hover);
    animation: expandDetail 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

@keyframes expandDetail {
    from {
        opacity: 0;
        transform: scaleY(0);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: scaleY(1);
        max-height: 2000px;
    }
}

.detail-header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.detail-icon {
    font-size: 4rem;
    flex-shrink: 0;
}

.detail-icon img {
    width: 80px;
    height: 80px;
    border-radius: 12px;
    object-fit: cover;
}

.detail-info {
    flex: 1;
}

.detail-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.detail-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.detail-close {
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 1.5rem;
    transition: var(--transition);
    flex-shrink: 0;
}

.detail-close:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    transform: scale(1.1);
}

.detail-content {
    color: var(--text-primary);
    line-height: 1.8;
}

.detail-content h1,
.detail-content h2,
.detail-content h3,
.detail-content h4,
.detail-content h5,
.detail-content h6 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.detail-content h1 { font-size: 1.8rem; }
.detail-content h2 { font-size: 1.5rem; }
.detail-content h3 { font-size: 1.3rem; }

.detail-content p {
    margin-bottom: 1rem;
}

.detail-content ul,
.detail-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.detail-content li {
    margin-bottom: 0.5rem;
}

.detail-content a {
    color: var(--accent);
    text-decoration: none;
}

.detail-content a:hover {
    text-decoration: underline;
}

.detail-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
}

.detail-content code {
    background-color: var(--bg-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.detail-content pre {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
}

.detail-content pre code {
    background: none;
    padding: 0;
}

.detail-content blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
}

/* No Results */
.no-results {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    font-size: 1.2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .collections-grid {
        grid-template-columns: 1fr;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .search-box {
        min-width: 100%;
    }
    
    .tag-filter-dropdown {
        right: 0;
        left: 0;
    }
    
    .detail-header {
        flex-direction: column;
    }
    
    .detail-close {
        align-self: flex-end;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Add Item Button */
.btn-add-item {
    padding: 0.75rem 1.5rem;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-add-item:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    overflow-y: auto;
    padding: 2rem;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--bg-card);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 700px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

/* Form */
.add-item-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
}

.btn-primary,
.btn-secondary {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

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

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

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent);
}

/* Preview Section */
.preview-section {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.preview-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.preview-card {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
}

/* Mobile responsiveness for modal */
@media (max-width: 768px) {
    .modal {
        padding: 1rem;
    }
    
    .modal-content {
        max-height: 95vh;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
    }
}