:root {
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --border-color: #404040;
    --shadow-light: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-medium: 0 4px 12px rgba(0,0,0,0.4);
    --accent-primary: #007bff;
    --accent-primary-hover: #0056b3;
    --accent-danger: #dc3545;
    --accent-danger-hover: #c82333;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --border-radius: 8px;
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
}

.container {
    display: flex;
    height: 100vh;
    overflow: hidden;
    margin-left: 0;
    transition: var(--transition);
}

.container.sidebar-open {
    margin-left: 280px;
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    transition: var(--transition);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    z-index: 100;
    transform: translateX(-100%);
}

.container.sidebar-open .sidebar {
    transform: translateX(0);
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-tertiary);
}

.sidebar-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.toggle-btn {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.toggle-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md) 0;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-secondary);
}

.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background: #6b7280;
}

.new-report-btn {
    margin: 0 var(--spacing-md) var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    width: calc(100% - 2 * var(--spacing-md));
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    transition: var(--transition);
}

.new-report-btn:hover {
    background: var(--accent-primary-hover);
    transform: translateY(-1px);
}

.report-list {
    list-style: none;
}

.report-item {
    padding: var(--spacing-md);
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
}

.report-item:hover {
    background: var(--bg-tertiary);
}

.report-item.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-right: none;
}

.report-item.active::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to top, var(--accent-primary), var(--accent-primary-hover));
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.report-title {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.report-date {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-trigger {
    position: fixed;
    left: 0;
    top: 0;
    width: 20px;
    height: 100vh;
    z-index: 99;
    cursor: ew-resize;
    background: transparent;
    transition: width var(--transition);
}

.container.sidebar-open .sidebar-trigger {
    width: 0;
}

.sidebar-hint {
    position: fixed;
    left: 25px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(18, 18, 18, 0.8);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 12px;
    opacity: 0.5;
    transition: opacity var(--transition), transform var(--transition);
    z-index: 98;
    white-space: nowrap;
    box-shadow: var(--shadow-light);
    pointer-events: none;
}

.sidebar-hint:hover {
    opacity: 0.8;
}

.sidebar-hint.hidden {
    opacity: 0;
    transform: translateY(-50%) translateX(-20px);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    overflow: hidden;
    width: 100%;
}

.header {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 64px;
}

.header h1 {
    font-size: 24px;
    color: var(--text-primary);
    font-weight: 600;
    flex-grow: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: var(--spacing-md);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
    align-items: center;
}

.action-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
    transition: var(--transition);
}

.action-btn:hover,
.action-btn:focus {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    outline: none;
}

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

.action-btn.primary:hover {
    background: var(--accent-primary-hover);
}

.content-area {
    flex: 1;
    padding: var(--spacing-xl);
    overflow-y: auto;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 80px var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.empty-state h3 {
    font-size: 20px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-muted);
}

.empty-state p {
    font-size: 14px;
    max-width: 400px;
}

.report-content {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--border-color);
}

.report-content h2 {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-md);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.report-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.meta-item {
    display: flex;
    flex-direction: column;
}

.meta-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
}

.meta-value {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.report-abstract {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-left: 4px solid var(--accent-primary);
    border-radius: var(--border-radius);
}

.abstract-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-xs);
}

.abstract-content {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
}

.report-main-content {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.report-main-content h3 {
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    border-bottom: none;
    padding-bottom: var(--spacing-sm);
}

.main-content-text {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-primary);
}

.main-content-text p,
.abstract-content p {
    margin-bottom: 1em;
}

.main-content-text h1,
.abstract-content h1 {
    font-size: 32px;
    line-height: 1.2;
    color: var(--text-primary);
    font-weight: 700;
    margin: var(--spacing-xl) 0 var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.main-content-text h1::after,
.abstract-content h1::after {
    display: none;
}

.main-content-text h2,
.abstract-content h2 {
    font-size: 26px;
    line-height: 1.3;
    color: var(--text-primary);
    font-weight: 600;
    margin: var(--spacing-lg) 0 var(--spacing-md);
    padding-left: var(--spacing-md);
    border-left: none;
    background: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 0;
}

.main-content-text h3,
.abstract-content h3 {
    font-size: 20px;
    line-height: 1.4;
    color: var(--text-primary);
    font-weight: 600;
    margin: var(--spacing-md) 0 var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
}

.main-content-text h4,
.abstract-content h4 {
    font-size: 18px;
    line-height: 1.4;
    color: var(--text-primary);
    font-weight: 600;
    margin: var(--spacing-md) 0 var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.main-content-text h5,
.abstract-content h5 {
    font-size: 16px;
    line-height: 1.4;
    color: var(--text-secondary);
    font-weight: 600;
    margin: var(--spacing-sm) 0 var(--spacing-xs);
}

.main-content-text h6,
.abstract-content h6 {
    font-size: 14px;
    line-height: 1.4;
    color: var(--text-muted);
    font-weight: 600;
    margin: var(--spacing-sm) 0 var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.main-content-text ul, .main-content-text ol,
.abstract-content ul, .abstract-content ol {
    margin: var(--spacing-md) 0 var(--spacing-md) var(--spacing-lg);
    padding-left: var(--spacing-lg);
}

.main-content-text ul li,
.main-content-text ol li,
.abstract-content ul li,
.abstract-content ol li {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-sm);
}

.main-content-text ol {
    counter-reset: item;
}

.main-content-text ol li {
    display: block;
}

.main-content-text ol li:before {
    content: counter(item) ".";
    counter-increment: item;
    font-weight: 600;
    color: var(--accent-primary);
    margin-right: var(--spacing-xs);
}

.main-content-text pre,
.abstract-content pre {
    position: relative;
    margin: var(--spacing-lg) 0;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.main-content-text pre code,
.abstract-content pre code {
    display: block;
    background-color: #282c34;
    color: #abb2bf;
    padding: var(--spacing-lg);
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', 'Andale Mono', 'Ubuntu Mono', monospace;
    line-height: 1.5;
    border: none;
    tab-size: 4;
}

.code-copy-btn {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 4px;
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: 12px;
    opacity: 0.8;
    transition: var(--transition);
    z-index: 10;
}

.code-copy-btn:hover {
    background: var(--accent-primary-hover);
    opacity: 1;
}

.code-copy-btn.copied {
    background: var(--accent-danger);
}

.main-content-text table,
.abstract-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    font-size: 13px;
}

.main-content-text th, .main-content-text td,
.abstract-content th, .abstract-content td {
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    text-align: left;
    vertical-align: top;
}

.main-content-text th,
.abstract-content th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.main-content-text tbody tr:nth-child(even),
.abstract-content tbody tr:nth-child(even) {
    background: rgba(0,123,255,0.05);
}

.main-content-text tbody tr:hover,
.abstract-content tbody tr:hover {
    background: var(--bg-tertiary);
    transform: scale(1.01);
    transition: var(--transition);
}

.report-author-date {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
}

.report-author-date strong {
    color: var(--text-primary);
}

.float-button {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    background-color: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    box-shadow: var(--shadow-medium);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    z-index: 1000;
    line-height: 1.2;
    padding: var(--spacing-xs);
    box-sizing: border-box;
}

.float-button:hover {
    background-color: var(--accent-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%) !important;
        width: 280px;
    }

    .container {
        margin-left: 0 !important;
    }

    .sidebar-trigger {
        display: none;
    }

    .sidebar-hint {
        display: none;
    }

    .container.sidebar-open {
        margin-left: 0 !important;
    }

    .sidebar-open .sidebar {
        transform: translateX(0) !important;
    }

    .header {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .content-area {
        padding: var(--spacing-lg);
    }

    .report-content {
        padding: var(--spacing-lg);
    }

    .float-button {
        width: 50px;
        height: 50px;
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        font-size: 10px;
    }

    .header h1 {
        margin-right: var(--spacing-sm);
        font-size: 20px;
    }

    .header-actions {
        flex-wrap: wrap;
        justify-content: flex-end;
        gap: var(--spacing-xs);
    }

    .header-actions .action-btn {
        margin-bottom: var(--spacing-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 13px;
    }

    .main-content-text h1, .abstract-content h1 { font-size: 24px; }

    .main-content-text h2, .abstract-content h2 { font-size: 20px; }

    .main-content-text h3, .abstract-content h3 { font-size: 18px; }

    .main-content-text table, .abstract-content table { font-size: 12px; }

    .main-content-text th, .main-content-text td, .abstract-content th, .abstract-content td { padding: var(--spacing-sm); }
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.7);
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--bg-secondary);
    margin: auto;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    width: 90%;
    max-width: 600px;
    position: relative;
    animation: fadeIn 0.3s ease-out;
    border: 1px solid var(--border-color);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-content h2 {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.close-button {
    color: var(--text-secondary);
    font-size: 28px;
    font-weight: bold;
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition);
}

.close-button:hover,
.close-button:focus {
    color: var(--accent-danger);
}

.input-group {
    margin-bottom: var(--spacing-lg);
}

.input-group label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.input-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.input-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(0,123,255,0.25);
}

.modal-tips {
    background-color: var(--bg-tertiary);
    border-left: 4px solid #ffc107;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    border-radius: var(--border-radius);
    font-size: 13px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.modal-tips p {
    margin-bottom: var(--spacing-sm);
}

.modal-tips p:last-child {
    margin-bottom: 0;
}

.modal-tips p a {
    color: var(--accent-primary);
    text-decoration: underline;
}

.modal-tips p a:hover {
    color: var(--accent-primary-hover);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        padding: var(--spacing-lg);
    }

    .modal-content h2 {
        font-size: 20px;
    }

    .close-button {
        font-size: 24px;
        top: var(--spacing-sm);
        right: var(--spacing-md);
    }

    .modal-tips {
        padding: var(--spacing-sm);
        font-size: 12px;
    }

    .action-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 13px;
    }
}

.loading-animation {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    font-size: 16px;
    color: var(--text-secondary);
    text-align: center;
}

.loading-spinner {
    border: 4px solid rgba(0, 123, 255, 0.2);
    border-top: 4px solid var(--accent-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.abort-generation-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-danger);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.abort-generation-btn:hover {
    background: var(--accent-danger-hover);
}

.error-state-container {
    text-align: center;
    padding: 80px var(--spacing-md);
    background-color: #2a1a1a;
    border: 1px solid var(--accent-danger);
    border-radius: var(--border-radius);
    margin: var(--spacing-xl) auto;
    max-width: 600px;
    box-shadow: var(--shadow-medium);
}

.error-state-container h3.error-message {
    color: var(--accent-danger);
    font-size: 24px;
    margin-bottom: var(--spacing-md);
}

.error-state-container p.error-message {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.6;
}

.error-state-container p.error-message a {
    font-weight: bold;
    color: var(--accent-primary);
}

#shareModal .modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

#shareModal .modal-content h2 {
    color: var(--text-primary);
}

.share-link-container {
    display: flex;
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: var(--bg-primary);
}

#shareLinkInput {
    flex-grow: 1;
    padding: var(--spacing-md);
    border: none;
    background-color: transparent;
    font-size: 14px;
    color: var(--text-primary);
    cursor: text;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#shareLinkInput:focus {
    outline: none;
}

#copyShareLinkBtn {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--accent-primary);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
    flex-shrink: 0;
}

#copyShareLinkBtn:hover {
    background-color: var(--accent-primary-hover);
}

.share-modal-footer {
    text-align: right;
}

.share-modal-footer .action-btn {
    margin-left: var(--spacing-sm);
}

#shareModal .close-button {
    color: var(--text-secondary);
}

#shareModal .close-button:hover,
#shareModal .close-button:focus {
    color: var(--accent-danger);
}

#deleteModal .modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    max-width: 400px;
    text-align: center;
}

#deleteModal .modal-content h2 {
    color: var(--accent-danger);
    margin-bottom: var(--spacing-md);
}

#deleteModal .modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 14px;
}

#deleteModal .close-button {
    color: var(--text-secondary);
}

#deleteModal .close-button:hover {
    color: var(--accent-danger);
}