:root {
    --primary-color: #166534;
    --secondary-color: #15803d;
    --text-color: #1f2937;
    --bg-color: #ffffff;
    --card-bg: #f3f4f6;
    --success-color: #16a34a;
}

.dark-mode {
    --primary-color: #22c55e;
    --secondary-color: #4ade80;
    --text-color: #f3f4f6;
    --bg-color: #111827;
    --card-bg: #1f2937;
    --success-color: #22c55e;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: all 0.3s ease;
}

/* Navigation */
.navbar {
    background-color: var(--bg-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-color);
}

.nav-link {
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
#hero {
    padding-top: 80px;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--card-bg) 100%);
}

.profile-image img {
    max-width: 300px;
    border: 4px solid var(--primary-color);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Section Titles */
.section-title {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

/* Skills Section */
.skill-category {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.skill-category:hover {
    transform: translateY(-5px);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.badge {
    padding: 0.5rem 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.badge:hover {
    transform: scale(1.05);
}

/* Project Cards */
.project-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
    border: 1px solid rgba(0,0,0,0.1);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
    border-color: var(--primary-color);
}

.project-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
}

.project-card .text-muted {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.project-card .role {
    font-size: 0.9rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-card .role i {
    font-size: 1rem;
}

.project-card .tech-stack {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid rgba(0,0,0,0.1);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Tech Badge */
.tech-badge {
    background-color: rgba(22, 101, 52, 0.1);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 0.75rem;
    font-weight: 500;
    font-size: 0.85rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.tech-badge:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Achievement Badge */
.achievement-badge {
    background-color: rgba(22, 165, 74, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
    padding: 0.5rem 0.75rem;
    font-weight: 500;
    font-size: 0.85rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.achievement-badge:hover {
    background-color: var(--success-color);
    color: white;
    transform: translateY(-2px);
}

/* Project Filters */
.project-filters {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.project-filters .btn {
    padding: 0.6rem 1.5rem;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.project-filters .btn:hover {
    background-color: rgba(22, 101, 52, 0.1);
    transform: translateY(-2px);
}

.project-filters .btn.active {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

/* Project Item Animation */
.project-item {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
    display: none;
    height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
    width: 100%;
}

.project-item.show {
    opacity: 1;
    transform: translateY(0);
    display: block;
    height: auto;
    margin-bottom: 1.5rem;
    padding: 0 15px;
}

/* Điều chỉnh lại grid system */
@media (min-width: 768px) {
    .project-item.show {
        padding: 0 15px;
    }
}

@media (min-width: 992px) {
    .project-item.show {
        padding: 0 15px;
    }
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    height: 100%;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 0;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.project-role {
    font-size: 1rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-weight: 500;
}

.project-description {
    font-size: 0.95rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tech .badge {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    background-color: var(--primary-color);
    color: white;
    border-radius: 2rem;
}

.project-achievements {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.project-achievements h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.project-achievements ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.project-achievements li {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.project-achievements li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* Dark mode adjustments */
.dark-mode .project-card {
    background-color: var(--card-bg);
    border-color: rgba(255, 255, 255, 0.05);
}

.dark-mode .project-tech .badge {
    background-color: var(--primary-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .project-filters .btn {
        padding: 0.4rem 1rem;
        font-size: 0.9rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .project-title {
        font-size: 1.3rem;
    }

    .project-tech .badge {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

/* Download CV Button */
.download-cv {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
    padding: 1rem 1.5rem;
    border-radius: 50px;
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-weight: 500;
    border: 2px solid var(--primary-color);
}

.download-cv:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
    color: white;
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.download-cv i {
    font-size: 1.25rem;
}

.download-cv span {
    font-size: 0.95rem;
    letter-spacing: 0.5px;
}

/* Dark mode adjustments */
.dark-mode .download-cv {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.dark-mode .download-cv:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .download-cv {
        bottom: 1.5rem;
        right: 1.5rem;
        padding: 0.75rem;
    }
    
    .download-cv span {
        display: none;
    }
    
    .download-cv i {
        font-size: 1.1rem;
    }
}

/* Contact Form */
.contact-form {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.form-control {
    background-color: var(--bg-color);
    border: 1px solid var(--card-bg);
    color: var(--text-color);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(22, 101, 52, 0.25);
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Responsive Design */
@media (max-width: 768px) {
    .profile-image img {
        max-width: 200px;
        margin-top: 2rem;
    }
    
    .section-title {
        margin-bottom: 2rem;
    }
    
    .skill-category {
        margin-bottom: 1rem;
    }
}

/* Dark Mode Toggle */
#themeToggle {
    width: 40px;
    height: 40px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

/* Footer */
footer {
    background-color: var(--card-bg);
    color: var(--text-color);
}

/* Project Section */
.project-filters {
    margin-bottom: 2rem;
}

.project-filters .btn {
    margin: 0.5rem;
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    transition: all 0.3s ease;
}

.project-filters .btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.project-item {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
    display: none;
    height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
    width: 100%;
}

.project-item.show {
    opacity: 1;
    transform: translateY(0);
    display: block;
    height: auto;
    margin-bottom: 1.5rem;
    padding: 0 15px;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    height: 100%;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 0;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.project-role {
    font-size: 1rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-weight: 500;
}

.project-description {
    font-size: 0.95rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tech .badge {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    background-color: var(--primary-color);
    color: white;
    border-radius: 2rem;
}

.project-achievements {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.project-achievements h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.project-achievements ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.project-achievements li {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.project-achievements li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* Dark mode adjustments */
.dark-mode .project-card {
    background-color: var(--card-bg);
    border-color: rgba(255, 255, 255, 0.05);
}

.dark-mode .project-tech .badge {
    background-color: var(--primary-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .project-filters .btn {
        padding: 0.4rem 1rem;
        font-size: 0.9rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .project-title {
        font-size: 1.3rem;
    }

    .project-tech .badge {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

/* Project Details Modal */
.modal-fullscreen {
    background-color: var(--bg-color);
}

.modal-content {
    background-color: var(--bg-color);
    border: none;
    border-radius: 0;
}

.modal-header {
    border-bottom: 1px solid rgba(0,0,0,0.1);
    padding: 1.5rem;
}

.modal-title {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 600;
}

.modal-body {
    padding: 2rem;
    color: var(--text-color);
}

.project-details-section {
    margin-bottom: 2rem;
}

.project-details-section h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.project-details-section ul {
    list-style: none;
    padding-left: 0;
}

.project-details-section li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
}

.project-details-section li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

.project-details-section .tech-badge {
    display: inline-block;
    margin: 0.25rem;
}

/* Dark mode adjustments */
.dark-mode .modal-content {
    background-color: var(--bg-color);
}

.dark-mode .modal-header {
    border-bottom-color: rgba(255,255,255,0.1);
}

.dark-mode .modal-title {
    color: var(--primary-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .modal-header {
        padding: 1rem;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .modal-title {
        font-size: 1.2rem;
    }
    
    .project-details-section h3 {
        font-size: 1.1rem;
    }
}