body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 25% 25%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255,255,255,0.05) 0%, transparent 50%);
    z-index: -1;
    animation: backgroundMove 20s ease-in-out infinite;
}

@keyframes backgroundMove {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.main-container {
    padding: 40px 20px;
    min-height: 100vh;
    animation: fadeIn 1s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.header-section {
    text-align: center;
    margin-bottom: 60px;
    color: white;
    animation: slideInFromTop 1s ease-out;
}

@keyframes slideInFromTop {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 25px;
    text-shadow: 0 4px 15px rgba(0,0,0,0.3);
    background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.7));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.header-subtitle {
    font-size: 1.4rem;
    opacity: 0.95;
    margin-bottom: 40px;
    font-weight: 400;
    text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.projects-container {
    max-width: 1200px;
    margin: 0 auto;
}

.coming-soon-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 30px;
    box-shadow: 
        0 30px 80px rgba(0,0,0,0.15),
        0 0 0 1px rgba(255,255,255,0.2),
        inset 0 1px 0 rgba(255,255,255,0.8);
    padding: 80px 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation: slideInUp 1s ease-out 0.3s both;
}

.coming-soon-card:hover {
    transform: translateY(-10px);
    box-shadow: 
        0 40px 100px rgba(0,0,0,0.2),
        0 0 0 1px rgba(255,255,255,0.3),
        inset 0 1px 0 rgba(255,255,255,0.9);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.coming-soon-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, #667eea, #764ba2, #667eea);
    background-size: 200% 100%;
    animation: gradientMove 3s ease-in-out infinite;
}

@keyframes gradientMove {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.coming-soon-icon {
    font-size: 6rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 35px;
    animation: iconFloat 4s ease-in-out infinite;
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(5deg); }
}

.coming-soon-title {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 25px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.coming-soon-description {
    font-size: 1.25rem;
    color: #6c757d;
    margin-bottom: 45px;
    line-height: 1.8;
    font-weight: 400;
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.back-button:hover {
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.navigation-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.nav-btn:hover {
    background: #667eea;
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.language-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: white;
    padding: 10px 15px;
    border-radius: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 10px;
}

.toggle-switch {
    position: relative;
    width: 60px;
    height: 30px;
    background: #ccc;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.toggle-switch.active {
    background: #667eea;
}

.toggle-slider {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.toggle-switch.active .toggle-slider {
    transform: translateX(30px);
}

.lang-label {
    font-weight: 600;
    font-size: 0.9em;
}

.lang-label.active {
    color: #667eea;
}

/* Hide elements based on language */
.lang-vi { display: block !important; }
.lang-en { display: none !important; }

body.english .lang-vi { display: none !important; }
body.english .lang-en { display: block !important; }

@media (max-width: 768px) {
    .header-title {
        font-size: 2.5rem;
    }
    
    .coming-soon-card {
        padding: 60px 30px;
        margin: 10px;
    }
    
    .coming-soon-title {
        font-size: 2rem;
    }
    
    .navigation-links {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

/* Project Cards Styles */
.featured-section, .regular-section {
    margin-bottom: 60px;
}

.section-title {
    color: white;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.section-title i {
    color: #ffd700;
    font-size: 1.8rem;
}

.project-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    animation: projectCardFloat 6s ease-in-out infinite;
}

@keyframes projectCardFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.project-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 30px 60px rgba(0,0,0,0.25);
}

.featured-card {
    border: 2px solid #ffd700;
    background: linear-gradient(135deg, rgba(255,215,0,0.1) 0%, rgba(255,255,255,0.95) 100%);
}

.project-video, .project-thumbnail {
    position: relative;
    overflow: hidden;
}

.project-video video, .project-thumbnail img {
    border-radius: 0;
    transition: all 0.3s ease;
}

.project-card:hover .project-video video,
.project-card:hover .project-thumbnail img {
    transform: scale(1.05);
}

.video-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 3rem;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.project-thumbnail:hover .video-overlay {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
}

.project-content {
    padding: 25px;
}

.project-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 15px;
    line-height: 1.3;
}

.project-meta {
    margin-bottom: 15px;
}

.project-date {
    color: #666;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.project-description {
    color: #555;
    margin-bottom: 20px;
    line-height: 1.6;
}

.technologies h5 {
    font-size: 1rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.tech-tag {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tech-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.tech-more {
    background: #e0e0e0;
    color: #666;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.project-link:hover {
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.project-link.primary {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    color: #333;
}

.project-link.primary:hover {
    color: #333;
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.4);
}

/* Project Detail Page Styles */
.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    color: #333;
    padding: 12px 20px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.3s ease;
}

.back-button:hover {
    background: white;
    color: #333;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.project-detail-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 80px 20px 40px;
}

.project-header {
    text-align: center;
    margin-bottom: 50px;
    color: white;
}

.project-header .project-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.featured-badge {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    color: #333;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 5px;
}

.ongoing-badge {
    background: linear-gradient(135deg, #4caf50, #8bc34a);
    color: white;
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: 10px;
}

.project-video-section,
.project-description-section,
.technologies-section,
.project-links-section,
.navigation-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-title {
    color: #333;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.video-container {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.description-content {
    color: #555;
    line-height: 1.8;
    font-size: 1.1rem;
}

.tech-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tech-badge {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 8px 16px;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tech-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.links-container {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.project-link-large {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 25px;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 15px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.project-link-large:hover {
    color: #333;
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
    border-color: #667eea;
}

.project-link-large i {
    font-size: 2rem;
    color: #667eea;
}

.project-link-large strong {
    font-size: 1.2rem;
    margin-bottom: 5px;
    display: block;
}

.project-link-large p {
    margin: 0;
    color: #666;
    font-size: 0.95rem;
}

.navigation-section {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Responsive Design for Project Details */
@media (max-width: 768px) {
    .project-header .project-title {
        font-size: 2rem;
        flex-direction: column;
        gap: 10px;
    }
    
    .project-detail-container {
        padding: 60px 15px 20px;
    }
    
    .project-video-section,
    .project-description-section,
    .technologies-section,
    .project-links-section,
    .navigation-section {
        padding: 20px;
    }
    
    .links-container {
        grid-template-columns: 1fr;
    }
    
    .project-link-large {
        padding: 20px;
    }
    
    .navigation-section {
        flex-direction: column;
        align-items: center;
    }
    
    .back-button {
        position: relative;
        top: auto;
        left: auto;
        margin-bottom: 20px;
    }
}