/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navigation */
.navbar {
    background-color: var(--bg-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.nav-brand a:hover {
    color: var(--primary-dark);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: var(--transition);
}

.lang-switcher {
    margin-left: 1rem;
}

.lang-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.lang-btn:hover {
    background-color: var(--primary-dark);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    margin-bottom: 3rem;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.hero-image {
    flex: 0 0 200px;
}

.hero-image img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid white;
    box-shadow: var(--shadow-lg);
}

.hero-text {
    flex: 1;
    min-width: 300px;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.hero-text .subtitle {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    opacity: 0.95;
}

.hero-text .location {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    transition: var(--transition);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.2);
}

.social-links a:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Sections */
.section {
    padding: 3rem 0;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-color);
    text-align: center;
    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;
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-light);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.project-card {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-card h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
    line-height: 1.4;
    flex-shrink: 0;
}

.project-card h3 a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.project-card h3 a:hover {
    color: var(--primary-color);
}

.project-card p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
    flex-grow: 1;
    margin: 0;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.text-center {
    text-align: center;
}

/* Job Objective */
.objective-content {
    max-width: 800px;
    margin: 0 auto;
}

.objective-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.preferred-roles {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    margin: 2rem 0;
}

.preferred-roles h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-size: 1.2rem;
}

.preferred-roles h3:first-child {
    margin-top: 0;
}

.preferred-roles ul {
    list-style: none;
    padding-left: 0;
}

.preferred-roles li {
    padding: 0.5rem 0;
    color: var(--text-light);
    padding-left: 1.5rem;
    position: relative;
}

.preferred-roles li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.location-pref {
    margin-top: 1rem;
    font-style: italic;
}

.resume-download {
    text-align: center;
    margin-top: 2rem;
}

/* Certifications */
.certifications-list {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.certification-item {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.certification-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.certification-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.certification-item h3 {
    margin: 0;
    color: var(--text-color);
    font-size: 1.3rem;
    font-weight: 600;
    flex: 1;
    min-width: 200px;
}

.certification-issuer {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1rem;
    white-space: nowrap;
}

.certification-date {
    color: var(--text-light);
    font-size: 0.95rem;
    margin: 0.5rem 0;
    font-style: italic;
}

.certification-description {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 1rem;
    margin: 1rem 0;
}

.certification-links {
    margin-top: 1rem;
    display: flex;
    align-items: center;
}

.certification-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
}

.certification-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Skills List */
.skills-list {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.skill-item {
    background-color: var(--bg-light);
    padding: 1.75rem 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.skill-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.skill-item h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.skill-item p {
    color: var(--text-light);
    line-height: 1.9;
    font-size: 1rem;
    margin: 0;
    letter-spacing: 0.01em;
}

/* Footer */
.footer {
    background-color: var(--bg-light);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-light);
    margin-top: 4rem;
}

/* Course/Project List Pages */
.list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.list-item {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.list-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.list-item h3 {
    margin-bottom: 1rem;
}

.list-item h3 a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.list-item h3 a:hover {
    color: var(--primary-color);
}

.list-item .meta {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.list-item .description {
    color: var(--text-light);
    line-height: 1.7;
}

/* Category Section */
.category-section {
    margin-bottom: 3rem;
}

/* Semester Row Layout */
.semester-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 2rem;
}

.semester-row {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.semester-row:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.semester-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.semester-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.semester-title a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.semester-title a:hover {
    color: var(--primary-color);
}

.semester-date {
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
}

.semester-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.semester-detail-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.semester-detail-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.semester-detail-btn i {
    font-size: 0.9rem;
}

.courses-in-semester {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.course-entry {
    padding: 1rem;
    background-color: var(--bg-color);
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
}

.course-code-name {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.course-code {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1rem;
}

.course-name {
    color: var(--text-color);
    font-weight: 500;
    font-size: 1rem;
}

.course-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.keyword-tag {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    background-color: var(--bg-light);
    color: var(--text-light);
    border-radius: 20px;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.keyword-tag:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Project Row Layout */
.project-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 2rem;
}

.project-row {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.project-row:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.project-header {
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.project-title a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.project-title a:hover {
    color: var(--primary-color);
}

.project-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.project-description {
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.project-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.project-keyword-tag {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
}

.project-keyword-tag:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

/* Detail Pages */
.detail-header {
    margin-bottom: 3rem;
}

.detail-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
    color: var(--text-light);
}

.detail-content {
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.8;
}

.detail-content h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.detail-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
    font-size: 1.4rem;
}

.detail-content p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.detail-content ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.detail-content li {
    margin-bottom: 0.5rem;
}

.detail-content a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.detail-content a:hover {
    text-decoration: underline;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

.back-link i {
    margin-right: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-text .subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .projects-grid,
    .list-grid,
    .skills-list {
        gap: 1.25rem;
    }

    .skill-item {
        padding: 1.5rem;
    }

    .skill-item h3 {
        font-size: 1.15rem;
        margin-bottom: 0.6rem;
    }

    .skill-item p {
        font-size: 0.95rem;
        line-height: 1.8;
    }

    .certification-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .certification-item {
        padding: 1.5rem;
    }

    .certification-item h3 {
        font-size: 1.2rem;
    }

    .certification-description {
        font-size: 0.95rem;
    }

    /* Semester Row Responsive */
    .semester-header {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .course-code-name {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .course-keywords {
        margin-top: 0.75rem;
    }

    /* Project Row Responsive */
    .project-title {
        font-size: 1.2rem;
    }

    .project-meta-row {
        flex-direction: column;
        gap: 0.75rem;
    }

    .project-keywords {
        margin-top: 1rem;
    }
}