/* 二级页面专用样式 - 极简主义设计 */
.project-header {
    padding: 8rem 3rem 4rem;
    text-align: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.project-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-tertiary);
}

.project-company::after {
    content: '|';
    margin-left: 2rem;
    color: var(--border-color);
}

.project-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.project-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.project-tags {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.project-tag {
    padding: 0.4rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* 返回导航 */
.nav-back {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 1rem 3rem;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.back-link:hover {
    color: var(--text-primary);
}

/* 项目内容 */
.project-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem;
}

.detail-section {
    margin-bottom: 3rem;
}

.detail-section h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.detail-section h2 i {
    color: var(--text-tertiary);
}

.section-body {
    color: var(--text-secondary);
    line-height: 1.8;
}

.section-body p {
    margin-bottom: 1rem;
}

/* 指标卡片 */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
}

.metric-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: all var(--transition-normal);
}

.metric-card:hover {
    border-color: var(--border-dark);
    transform: translateY(-2px);
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.metric-label {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

/* 职责列表 */
.responsibility-list {
    list-style: none;
}

.responsibility-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.responsibility-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--text-tertiary);
}

.responsibility-list li strong {
    color: var(--text-primary);
}

/* 功能模块网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: var(--border-dark);
}

.feature-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* 场景时间线 */
.scenarios-timeline {
    position: relative;
    padding-left: 2rem;
}

.scenario-item {
    position: relative;
    padding-bottom: 2rem;
    padding-left: 1.5rem;
    border-left: 2px solid var(--border-color);
}

.scenario-item:last-child {
    padding-bottom: 0;
    border-left-color: transparent;
}

.scenario-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 10px;
    height: 10px;
    background: var(--bg-primary);
    border: 2px solid var(--border-dark);
    border-radius: 50%;
}

.scenario-date {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 0.5rem;
}

.scenario-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.scenario-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 文档链接 */
.docs-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.doc-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.doc-link:hover {
    border-color: var(--border-dark);
    background: var(--bg-tertiary);
}

.doc-link i {
    color: var(--text-tertiary);
}

/* 技术栈标签 */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.tech-tag {
    padding: 0.3rem 0.8rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* 流程图 */
.process-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 2rem 0;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.process-step {
    text-align: center;
    padding: 1rem;
    min-width: 100px;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.step-title {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 500;
}

.process-arrow {
    color: var(--text-tertiary);
    font-size: 1.2rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .project-header {
        padding: 6rem 1.5rem 3rem;
    }

    .project-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .project-company::after {
        display: none;
    }

    .project-title {
        font-size: 1.8rem;
    }

    .project-content {
        padding: 2rem 1.5rem;
    }

    .nav-back {
        padding: 1rem 1.5rem;
    }

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

    .features-grid {
        grid-template-columns: 1fr;
    }

    .process-flow {
        flex-direction: column;
    }

    .process-arrow {
        transform: rotate(90deg);
    }
}