:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --background: #f3f4f6;
    --surface: #ffffff;
    --text-main: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --border: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
}

body {
    background-color: var(--background);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.5;
}

/* 布局优化 */
.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 50;
}

.sidebar-header {
    height: 64px;
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border);
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--primary);
    gap: 0.75rem;
}

.sidebar-nav {
    padding: 1.5rem 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
    font-weight: 500;
}

.nav-item:hover {
    background-color: #f3f4f6;
    color: var(--text-main);
}

.nav-item.active {
    background-color: #eef2ff;
    color: var(--primary);
}

.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 2rem;
    max-width: 1600px;
    margin-right: auto;
}

/* 卡片样式 */
.modern-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all 0.2s ease;
}

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

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
    gap: 0.5rem;
    text-decoration: none;
}

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

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

.btn-secondary {
    background-color: white;
    border-color: var(--border);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background-color: #f9fafb;
    border-color: #d1d5db;
}

.btn-danger {
    background-color: white;
    border-color: #fee2e2;
    color: var(--danger);
}

.btn-danger:hover {
    background-color: #fef2f2;
    border-color: #fca5a5;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--surface);
    transition: border-color 0.2s, box-shadow 0.2s;
    font-size: 0.95rem;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-hint {
    margin-top: 0.375rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* 页面头部 */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
}

.page-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
}

.page-desc {
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* 项目列表网格 */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.project-card-content {
    padding: 1.5rem;
}

.project-cover {
    width: 100%;
    aspect-ratio: 16 / 9;
    height: auto;
    background: #f3f4f6;
}

.project-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.project-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
}

.project-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.project-stats {
    display: flex;
    gap: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

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

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 详情页布局 */
.detail-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
}

.detail-main {
    min-width: 0;
}

.detail-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* 状态徽章 */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-primary {
    background-color: #eef2ff;
    color: var(--primary);
}

.badge-success {
    background-color: #ecfdf5;
    color: var(--success);
}

/* 图标辅助 */
.icon {
    width: 1.25rem;
    height: 1.25rem;
}

.icon-sm {
    width: 1rem;
    height: 1rem;
}