:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #764ba2;
    --secondary-color: #f093fb;
    --accent-color: #f5576c;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Courier New', monospace;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 14px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

.page-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: var(--primary-gradient);
    padding: 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    margin: 0 auto;
    width: 1200px;
    display: flex;
    align-items: center;
    height: 60px;
    padding: 0 16px;
}

.header-logo {
    flex: 1;
    display: flex;
    align-items: center;
    text-decoration: none;
}

.header-logo img {
    height: 40px;
    border-radius: 5px;
}

.header-nav {
    flex: 3;
    display: flex;
    justify-content: center;
}

.header-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 8px;
}

.header-nav li {
    margin: 0;
}

.header-nav a {
    color: rgba(255, 255, 255, 0.9);
    padding: 8px 10px;
    text-decoration: none;
    font-size: 13px;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.header-nav a:hover {
    color: white;
    background: rgba(255, 255, 255, 0.15);
}

.header-nav a.active {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.header-user {
    flex: 1;
    text-align: right;
}

.header-user a {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.header-user a:hover {
    background: rgba(255, 255, 255, 0.3);
}

.main-content {
    flex: 1;
    padding: 24px 0;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.card-hover {
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 20px;
    text-align: center;
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title::before {
    content: '';
    width: 4px;
    height: 18px;
    background: var(--primary-gradient);
    border-radius: 2px;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    gap: 6px;
    min-width: 80px;
}

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

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: #f1f5f9;
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: #e2e8f0;
}

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

.btn-success:hover {
    background: #059669;
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-outline:hover {
    background: #f8fafc;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 14px;
}

.form-label small {
    color: var(--text-muted);
    font-weight: normal;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s ease;
    background: var(--bg-color);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2364748b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 10px center;
    background-repeat: no-repeat;
    background-size: 16px;
    padding-right: 32px;
}

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

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 2px solid var(--border-color);
    accent-color: var(--primary-color);
}

.form-checkbox label {
    font-size: 14px;
    color: var(--text-secondary);
}

.file-upload {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-color);
}

.file-upload:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

.file-upload.dragover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.02);
}

.file-upload-icon {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: 0.6;
}

.file-upload-text {
    font-size: 14px;
    color: var(--text-secondary);
}

.file-upload-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.result-box {
    margin-top: 20px;
    padding: 20px;
    background: var(--bg-color);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.result-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.result-size {
    font-size: 12px;
    color: var(--text-muted);
    background: white;
    padding: 4px 10px;
    border-radius: 12px;
}

.result-content {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    word-break: break-all;
}

.result-content pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
}

.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0;
    flex-wrap: wrap;
}

.tab {
    padding: 10px 20px;
    background: none;
    border: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: all 0.3s ease;
    margin-bottom: -1px;
    position: relative;
}

.tab:hover {
    color: var(--text-secondary);
}

.tab.active {
    color: var(--primary-color);
    background: var(--card-bg);
    border-bottom: 2px solid var(--primary-color);
}

.search-box {
    margin-bottom: 20px;
}

.search-box form {
    display: flex;
    gap: 10px;
    max-width: 600px;
    margin: 0 auto;
}

.search-box input {
    flex: 1;
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}

.search-box input:focus {
    border-color: var(--primary-color);
}

.search-box button {
    padding: 12px 28px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.search-box button:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.category-tabs {
    margin-bottom: 20px;
    padding: 15px;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.category-tabs a {
    display: inline-block;
    padding: 8px 16px;
    margin: 4px 2px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    border-radius: var(--radius-sm);
    transition: all 0.3s;
}

.category-tabs a:hover {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
}

.category-tabs a.active {
    background: var(--primary-gradient);
    color: white;
}

.small-daohang {
    display: inline-block;
    padding: 0 10px;
    line-height: 20px;
}

.small-daohang a {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.small-daohang a:hover {
    color: var(--danger-color);
}

.grid {
    display: grid;
    gap: 16px;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.grid-6 {
    grid-template-columns: repeat(6, 1fr);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
}

.badge-primary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.badge-secondary {
    background: #f1f5f9;
    color: var(--text-secondary);
}

.priority-high {
    border-left: 3px solid var(--danger-color);
}

.priority-medium {
    border-left: 3px solid var(--warning-color);
}

.priority-low {
    border-left: 3px solid var(--success-color);
}

.category-work {
    background: rgba(102, 126, 234, 0.08);
    border-left: 3px solid var(--primary-color);
}

.category-life {
    background: rgba(245, 158, 11, 0.08);
    border-left: 3px solid var(--warning-color);
}

.category-study {
    background: rgba(16, 185, 129, 0.08);
    border-left: 3px solid var(--success-color);
}

.category-other {
    background: rgba(148, 163, 184, 0.08);
    border-left: 3px solid var(--text-muted);
}

.footer {
    text-align: center;
    padding: 32px 0;
    color: var(--text-muted);
    font-size: 13px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer p {
    margin: 4px 0;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.empty-state-desc {
    font-size: 14px;
    color: var(--text-muted);
}

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    gap: 8px;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    font-size: 14px;
    color: var(--text-muted);
}

.toast {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    z-index: 9999;
    animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
    box-shadow: var(--shadow-lg);
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

.toast-success {
    background: var(--success-color);
    color: white;
}

.toast-error {
    background: var(--danger-color);
    color: white;
}

.toast-warning {
    background: var(--warning-color);
    color: white;
}

.toast-info {
    background: var(--primary-color);
    color: white;
}

@media (max-width: 768px) {
    .header-content {
        width: 100%;
        flex-wrap: wrap;
        height: auto;
        padding: 10px 16px;
        gap: 10px;
    }

    .header-logo {
        flex: 1;
    }

    .header-nav {
        flex: 100%;
        justify-content: flex-start;
        overflow-x: auto;
    }

    .header-nav ul {
        flex-wrap: nowrap;
        padding-bottom: 5px;
    }

    .header-user {
        flex: 1;
        text-align: left;
    }

    .container {
        padding: 0 12px;
    }

    .main-content {
        padding: 16px 0;
    }

    .card {
        padding: 16px;
    }

    .grid-2, .grid-3, .grid-4, .grid-6 {
        grid-template-columns: 1fr;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab {
        padding: 8px 12px;
        font-size: 13px;
    }
}