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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 3;
}

header {
    text-align: center;
    padding: 50px 0 30px;
    position: relative;
}

.header-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

header h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 4.2rem;
    margin-bottom: 15px;
    background: linear-gradient(45deg, #2563eb, #7c3aed);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.05em;
    text-shadow: 0 4px 10px rgba(37, 99, 235, 0.15);
}

header p {
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 30px;
    color: #4b5563;
    line-height: 1.7;
}

.decorative-shape {
    position: absolute;
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #c7d2fe, #a5b4fc);
    border-radius: 50%;
    top: 50px;
    left: 5%;
    z-index: 1;
    filter: blur(90px);
    opacity: 0.4;
    animation: float 12s infinite ease-in-out;
}

.decorative-shape-2 {
    position: absolute;
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, #fbcfe8, #f9a8d4);
    border-radius: 50%;
    bottom: 50px;
    right: 5%;
    z-index: 1;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 10s infinite ease-in-out;
}

.decorative-shape-3 {
    position: absolute;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, #a5f3fc, #67e8f9);
    border-radius: 50%;
    top: 40%;
    right: 10%;
    z-index: 1;
    filter: blur(70px);
    opacity: 0.4;
    animation: float 14s infinite ease-in-out reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(-15px, -15px); }
    50% { transform: translate(10px, 10px); }
    75% { transform: translate(5px, -5px); }
}

.projects-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); 
    gap: 40px;
    margin-top: 40px;
    position: relative;
    z-index: 2;
}

@media (max-width: 1200px) {
    .projects-container {
        /* 讓 5 個專案在寬螢幕下保持一行 3 個 */
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); 
    }
}

@media (max-width: 600px) {
    .projects-container {
        grid-template-columns: 1fr;
    }
}

.project-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    transition: all 0.4s ease;
    position: relative;
    border: 1px solid rgba(0, 0, 0, 0.03);
    backdrop-filter: blur(10px);
    transform-style: preserve-3d;
    perspective: 1000px;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.15);
}

.card-header {
    padding: 35px 35px 25px;
    position: relative;
}

.project-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #3b82f6, #6366f1);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
    transition: transform 0.3s ease;
}

.project-card:hover .project-icon {
    transform: rotate(5deg) scale(1.05);
}

.project-card:nth-child(2) .project-icon {
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    box-shadow: 0 10px 25px rgba(139, 92, 246, 0.3);
}

.project-card:nth-child(3) .project-icon {
    background: linear-gradient(135deg, #facc15, #f97316); /* ACS/點名查詢 橙色調 */
    box-shadow: 0 10px 25px rgba(250, 204, 21, 0.3);
}

.project-card:nth-child(4) .project-icon {
    background: linear-gradient(135deg, #34d399, #059669); /* GitHub Pages Deploy Instructions 綠色調 */
    box-shadow: 0 10px 25px rgba(52, 211, 153, 0.3);
}

/* 第五張卡片 (Course Inquiry System) 樣式 - 圖標 */
.project-card:nth-child(5) .project-icon {
    background: linear-gradient(135deg, #ef4444, #dc2626); /* 紅色調 */
    box-shadow: 0 10px 25px rgba(239, 68, 68, 0.3);
}

.project-icon i {
    font-size: 36px;
    color: white;
}

.card-header h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.1rem;
    margin-bottom: 20px;
    color: #1e293b;
    position: relative;
    display: inline-block;
}

.card-header h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(45deg, #3b82f6, #2563eb);
    border-radius: 2px;
}

.project-card:nth-child(2) .card-header h2::after {
    background: linear-gradient(45deg, #8b5cf6, #7c3aed);
}

.project-card:nth-child(3) .card-header h2::after {
    background: linear-gradient(45deg, #facc15, #f97316);
}

.project-card:nth-child(4) .card-header h2::after {
    background: linear-gradient(45deg, #34d399, #059669);
}

/* 第五張卡片 (Course Inquiry System) 樣式 - 標題底線 */
.project-card:nth-child(5) .card-header h2::after {
    background: linear-gradient(45deg, #ef4444, #dc2626);
}

.project-description {
    font-size: 1.15rem;
    color: #4b5563;
    line-height: 1.8;
    margin-bottom: 30px;
}

.card-content {
    padding: 0 35px 35px;
    margin-top: auto;
}

.project-link {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(45deg, #3b82f6, #2563eb);
    color: white;
    padding: 14px 32px;
    border-radius: 14px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.25);
    position: relative;
    overflow: hidden;
}

.project-card:nth-child(2) .project-link {
    background: linear-gradient(45deg, #8b5cf6, #7c3aed);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.25);
}

.project-card:nth-child(3) .project-link {
    background: linear-gradient(45deg, #facc15, #f97316);
    box-shadow: 0 6px 20px rgba(250, 204, 21, 0.25);
}

.project-card:nth-child(4) .project-link {
    background: linear-gradient(45deg, #34d399, #059669);
    box-shadow: 0 6px 20px rgba(52, 211, 153, 0.25);
}

/* 第五張卡片 (Course Inquiry System) 樣式 - 連結按鈕 */
.project-card:nth-child(5) .project-link {
    background: linear-gradient(45deg, #ef4444, #dc2626);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.25);
}

.project-link:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 25px rgba(37, 99, 235, 0.35);
}

.project-card:nth-child(2) .project-link:hover {
    box-shadow: 0 12px 25px rgba(139, 92, 246, 0.35);
}

.project-card:nth-child(3) .project-link:hover {
    box-shadow: 0 12px 25px rgba(250, 204, 21, 0.35);
}

.project-card:nth-child(4) .project-link:hover {
    box-shadow: 0 12px 25px rgba(52, 211, 153, 0.35);
}

/* 第五張卡片 (Course Inquiry System) 樣式 - 連結按鈕 Hover */
.project-card:nth-child(5) .project-link:hover {
    box-shadow: 0 12px 25px rgba(239, 68, 68, 0.35);
}

.project-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.project-link:hover::before {
    left: 100%;
}

.project-link i {
    margin-left: 10px;
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.project-link:hover i {
    transform: translateX(4px);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 30px 0;
}

.tech-tag {
    background: #e0e7ff;
    color: #4f46e5;
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease;
}

.tech-tag:hover {
    transform: translateY(-3px);
}

.project-card:nth-child(2) .tech-tag {
    background: #f5d0fe;
    color: #c026d3;
}

.project-card:nth-child(3) .tech-tag {
    background: #fef9c3; 
    color: #a16207; 
}

.project-card:nth-child(4) .tech-tag {
    background: #d1fae5; 
    color: #065f46; 
}

/* 第五張卡片 (Course Inquiry System) 樣式 - 技術標籤 */
.project-card:nth-child(5) .tech-tag {
    background: #fee2e2; 
    color: #991b1b; 
}

.footer {
    text-align: center;
    margin-top: 80px;
    padding: 30px;
    position: relative;
    z-index: 2;
}

.github-link {
    display: inline-flex;
    align-items: center;
    background: white;
    color: #3b82f6;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    padding: 12px 30px;
    border-radius: 50px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.github-link:hover {
    color: #2563eb;
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.github-link i {
    margin-right: 12px;
    font-size: 1.4rem;
}

.copyright {
    margin-top: 25px;
    color: #6b7280;
    font-size: 1rem;
    font-weight: 500;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 3rem;
    }
    
    header p {
        font-size: 1.15rem;
    }
    
    .projects-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .project-card {
        border-radius: 20px;
    }
    
    .card-header {
        padding: 30px 25px 20px;
    }
    
    .card-content {
        padding: 0 25px 30px;
    }
    
    .project-icon {
        width: 70px;
        height: 70px;
    }
    
    .card-header h2 {
        font-size: 1.9rem;
    }
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(59, 130, 246, 0.1);
    z-index: 1;
    pointer-events: none;
}

/* --- 語言切換按鈕樣式 --- */
.lang-toggle-btn {
    background: #ffffff;
    color: #4f46e5;
    border: 2px solid #a5b4fc;
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.lang-toggle-btn:hover {
    background: #f0f0ff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}