/* ===================================
   作品集頁面樣式
   =================================== */

/* ===== 主要布局 ===== */
.portfolio-layout {
    display: flex;
    gap: 40px;
    margin-top: 50px;
    align-items: flex-start;
}

/* ===== 左側篩選器側邊欄 ===== */
.filters-sidebar {
    width: 280px;
    flex-shrink: 0;
    position: sticky;
    top: 100px;
}

/* ===== 右側作品主區域 ===== */
.portfolio-main {
    flex: 1;
    min-width: 0;
}

/* ===== 篩選器容器 ===== */
.filters-container {
    width: 100%;
    margin: 0;
    position: relative;
    z-index: 2;
}

.filter-section {
    margin-bottom: 30px;
}

.filter-section:last-child {
    margin-bottom: 0;
}

.filter-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 700;
    color: var(--cyan);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    opacity: 0.9;
}

.filter-title i {
    font-size: 12px;
}

.filter-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* 2 欄網格布局（分類和標籤） */
.filter-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

/* 自動換行布局（技術） */
.filter-wrap {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    gap: 6px;
}

.filter-btn {
    width: 100%;
    padding: 14px 18px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
    text-align: center;
}

.filter-btn span {
    position: relative;
    z-index: 1;
}

.filter-btn:hover {
    border-color: rgba(0, 217, 255, 0.4);
    background: rgba(0, 217, 255, 0.05);
    color: var(--cyan);
    transform: translateX(3px);
}

.filter-btn.active {
    background: rgba(0, 217, 255, 0.15);
    border-color: var(--cyan);
    color: var(--cyan);
    box-shadow: 0 0 15px rgba(0, 217, 255, 0.2);
}

/* 自動寬度按鈕（技術標籤） */
.filter-btn-auto {
    width: fit-content;
    padding: 8px 14px;
    font-size: 12px;
    white-space: nowrap;
    flex-shrink: 0;
}

/* ===== 作品網格 ===== */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    position: relative;
    z-index: 1;
}

/* ===== 作品項目 ===== */
.portfolio-item {
    opacity: 1;
    transform: scale(1);
    transition: all 0.5s ease;
}

.portfolio-item.hidden {
    opacity: 0;
    transform: scale(0.8);
    position: absolute;
    pointer-events: none;
}

/* ===== 作品卡片 ===== */
.portfolio-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.portfolio-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
    z-index: 0;
}

.portfolio-card:hover {
    transform: translateY(-10px);
    border-color: var(--cyan);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 0 30px rgba(0, 217, 255, 0.4);
}

.portfolio-card:hover::before {
    opacity: 1;
}

/* ===== 圖片區域 ===== */
.portfolio-image {
    position: relative;
    width: 100%;
    height: 280px;
    overflow: hidden;
    flex-shrink: 0;
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.portfolio-card:hover .portfolio-image img {
    transform: scale(1.1);
}

/* ===== 內容區域 ===== */
.portfolio-content {
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    flex: 1;
    position: relative;
    z-index: 1;
}

.portfolio-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    margin-bottom: 5px;
}

.portfolio-logo {
    width: 50px;
    height: 50px;
    object-fit: contain;
    padding: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 217, 255, 0.2);
    flex-shrink: 0;
}

.portfolio-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    margin: 0;
    flex: 1;
    text-shadow: 0 2px 10px rgba(0, 217, 255, 0.3);
    transition: color 0.3s ease;
}

.portfolio-card:hover .portfolio-title {
    color: var(--cyan);
}

.portfolio-description {
    font-size: 14px;
    line-height: 1.6;
    color: var(--sys-text-muted);
    margin: 0;
}

/* 技術標籤 */
.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.tech-tag {
    padding: 5px 12px;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 15px;
    font-size: 12px;
    color: var(--cyan);
    font-weight: 500;
    transition: all 0.3s ease;
}

.tech-tag:hover {
    background: rgba(0, 217, 255, 0.2);
    border-color: var(--cyan);
    transform: translateY(-2px);
}

/* ===================================
   響應式設計 (RWD)
   =================================== */

/* 平板 (768px - 1024px) */
@media (max-width: 992px) {
    .portfolio-layout {
        gap: 30px;
    }

    .filters-sidebar {
        width: 150px;
    }

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

    .portfolio-grid {
        gap: 20px;
        grid-template-columns: repeat(1, 1fr);
    }

    .filter-btn {
        padding: 12px 16px;
        font-size: 13px;
    }
}

/* 小平板 / 大手機 (481px - 768px) */
@media (max-width: 768px) {
    .portfolio-layout {
        flex-direction: column;
        gap: 30px;
        margin-top: 30px;
    }

    .filters-sidebar {
        width: 100%;
        position: static;
    }

    .filter-grid {
        display: flex;
        flex-wrap: wrap;
        flex-direction: row;
    }

    .filter-btn {
        width: fit-content;
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .portfolio-image {
        height: 240px;
    }

    .portfolio-content {
        padding: 20px;
    }
}

/* 手機 (最大 480px) */
@media (max-width: 480px) {
    .portfolio-layout {
        margin-top: 20px;
        gap: 20px;
    }

    .filter-section {
        margin-bottom: 20px;
    }

    .filter-title {
        font-size: 12px;
        margin-bottom: 10px;
    }

    .filter-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
    }

    .filter-btn {
        padding: 10px 14px;
        font-size: 12px;
    }

    .filter-btn-auto {
        padding: 6px 12px;
        font-size: 11px;
    }

    .portfolio-image {
        height: 200px;
    }

    .portfolio-content {
        padding: 15px;
        gap: 12px;
    }

    .portfolio-logo {
        width: 40px;
        height: 40px;
    }

    .portfolio-title {
        font-size: 16px;
    }

    .portfolio-description {
        font-size: 13px;
    }

    .tech-tag {
        padding: 4px 10px;
        font-size: 11px;
    }
}