/* =========================================
   PORTFOLIO 页面专用样式 - 二次元机能风
   ========================================= */

.portfolio-section {
    min-height: 100vh;
    padding: 5rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 10;
}

/* 区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-title {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.section-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* 筛选栏 */
.filter-bar {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: var(--border-dark);
    color: var(--text-primary);
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.filter-btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--secondary-accent);
}

.filter-btn.active {
    background: var(--text-primary);
    color: var(--text-inverse);
}

/* =========================================
   项目卡片网格
   ========================================= */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

/* 单个卡片 */
.project-card {
    background: var(--bg-card);
    border: var(--border-dark);
    position: relative;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    clip-path: polygon(
        0 0,
        100% 0,
        100% calc(100% - var(--clip-angle)),
        calc(100% - var(--clip-angle)) 100%,
        0 100%
    );
}

.project-card:hover {
    transform: translate(-3px, -3px);
    box-shadow: 6px 6px 0 var(--secondary-accent);
}

/* 卡片头部 */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border-bottom: 2px solid var(--text-primary);
}

.project-id {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 700;
}

.project-status {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 900;
    padding: 0.2rem 0.5rem;
    border: 2px solid;
}

.status-active {
    color: var(--primary-accent);
    border-color: var(--primary-accent);
}

.status-complete {
    color: var(--tech-blue);
    border-color: var(--tech-blue);
}

.status-archived {
    color: var(--text-muted);
    border-color: var(--text-muted);
}

/* 预览区 */
.card-preview {
    position: relative;
    height: 140px;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.preview-placeholder {
    text-align: center;
    z-index: 2;
}

.preview-icon {
    display: block;
    font-size: 2.5rem;
    margin-bottom: 0.4rem;
    opacity: 0.7;
}

.preview-text {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 2px;
}

/* 条形码装饰 */
.barcode {
    position: absolute;
    bottom: 8px;
    right: 8px;
    width: 70px;
    height: 25px;
    background: repeating-linear-gradient(
        90deg,
        var(--text-primary) 0px,
        var(--text-primary) 2px,
        transparent 2px,
        transparent 4px,
        var(--text-primary) 4px,
        var(--text-primary) 5px,
        transparent 5px,
        transparent 9px
    );
    opacity: 0.25;
}

.project-card:hover .card-preview {
    filter: none;
}

.card-preview {
    filter: grayscale(70%);
    transition: filter var(--transition-normal);
}

/* 卡片内容 */
.card-content {
    padding: 1rem;
}

.project-title {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
}

.project-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 0.85rem;
}

/* 标签 */
.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--text-primary);
    color: var(--text-primary);
}

/* 卡片底部 */
.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-top: 2px solid var(--bg-primary);
}

.project-date {
    font-family: var(--font-mono);
    font-size: 0.7rem;
}

.date-label {
    color: var(--text-muted);
    margin-right: 4px;
}

.date-value {
    color: var(--text-primary);
    font-weight: 700;
}

.btn-view {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.4rem 0.8rem;
    background: var(--bg-dark);
    border: none;
    color: var(--text-inverse);
    cursor: pointer;
    clip-path: polygon(
        0 0,
        calc(100% - 8px) 0,
        100% 8px,
        100% 100%,
        8px 100%,
        0 calc(100% - 8px)
    );
    transition: background var(--transition-fast);
}

.btn-view:hover {
    background: var(--secondary-accent);
    color: var(--text-primary);
}

.btn-view:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* =========================================
   统计面板
   ========================================= */
.stats-panel {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    max-width: 700px;
    margin: 0 auto;
}

.stat-box {
    text-align: center;
    padding: 1.25rem;
    background: var(--bg-card);
    border: var(--border-dark);
    position: relative;
}

.stat-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--secondary-accent);
}

.stat-number {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--secondary-accent);
    margin-bottom: 0.2rem;
}

.stat-box .stat-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 1px;
}

/* =========================================
   筛选动画
   ========================================= */
.project-card[hidden] {
    display: none;
}

.project-card.fade-out {
    animation: fadeOut 0.25s ease forwards;
}

.project-card.card-enter {
    animation: cardEnter 0.5s ease both;
    animation-delay: var(--card-delay, 0s);
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: scale(0.95);
    }
}

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

/* =========================================
   响应式
   ========================================= */
@media (max-width: 768px) {
    .portfolio-section {
        padding-top: 10rem;
    }

    .section-title {
        font-size: 1.4rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-panel {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .filter-btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.75rem;
    }
}