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

:root {
    --primary: #1e3a5f;
    --primary-light: #2d5a87;
    --accent: #c9a96e;
    --accent-light: #e8d5a8;
    --bg: #ffffff;
    --bg-alt: #f8f9fb;
    --text: #1a1a2e;
    --text-light: #5a5a6e;
    --text-muted: #8a8aa0;
    --border: #e5e7eb;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --container: 1100px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: 'Playfair Display', serif;
    font-size: 26px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-logo span {
    color: var(--accent);
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 36px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    font-size: 15px;
    position: relative;
    padding: 4px 0;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 8px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 100px 24px 60px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(201, 169, 110, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(30, 58, 95, 0.08) 0%, transparent 50%),
        linear-gradient(180deg, #fafbfd 0%, #ffffff 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle, rgba(30, 58, 95, 0.04) 1px, transparent 1px);
    background-size: 28px 28px;
    opacity: 0.6;
}

.hero-content {
    text-align: center;
    max-width: 680px;
    animation: fadeUp 0.8s ease-out;
}

.avatar-wrapper {
    margin-bottom: 32px;
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 48px;
    color: white;
    box-shadow: 0 8px 32px rgba(30, 58, 95, 0.25);
    border: 4px solid white;
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.hero-name {
    font-family: 'Playfair Display', serif;
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
    letter-spacing: -1px;
}

.hero-title {
    font-size: clamp(16px, 2.5vw, 20px);
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: clamp(14px, 2vw, 17px);
    color: var(--text-muted);
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 15px;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(30, 58, 95, 0.3);
}

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(30, 58, 95, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.hero-social {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.hero-social a {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: white;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 18px;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.hero-social a:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(30, 58, 95, 0.25);
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-muted);
    font-size: 20px;
    animation: bounce 2s infinite;
}

.section {
    padding: 100px 0;
}

.section:nth-child(even) {
    background: var(--bg-alt);
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 700;
    text-align: center;
    margin-bottom: 56px;
    color: var(--text);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: var(--accent);
    margin: 16px auto 0;
    border-radius: 2px;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text p {
    margin-bottom: 20px;
    color: var(--text-light);
    font-size: 16px;
}

.about-text strong {
    color: var(--primary);
}

.info-card {
    background: white;
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.info-item {
    display: flex;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.info-item:last-child {
    border-bottom: none;
}

.info-item i {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(30, 58, 95, 0.08);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.info-item div {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.info-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: 600;
}

.info-value {
    font-size: 15px;
    color: var(--text);
    font-weight: 500;
}

.info-value.link {
    color: var(--primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.info-value.link:hover {
    color: var(--accent);
}

.timeline {
    position: relative;
    max-width: 720px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(180deg, var(--accent) 0%, var(--accent-light) 100%);
}

.timeline-item {
    position: relative;
    padding-bottom: 40px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -34px;
    top: 6px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    border: 4px solid white;
    box-shadow: 0 0 0 2px var(--accent);
}

.timeline-date {
    font-size: 14px;
    color: var(--accent);
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.timeline-title {
    font-size: 19px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.timeline-sub {
    font-size: 15px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 8px;
}

.timeline-desc {
    font-size: 14px;
    color: var(--text-light);
}

.subsection {
    margin-bottom: 64px;
}

.subsection:last-child {
    margin-bottom: 0;
}

.subsection-title {
    font-family: 'Playfair Display', serif;
    font-size: 22px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.subsection-title i {
    color: var(--accent);
    font-size: 20px;
}

.paper-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.paper-card {
    background: white;
    border-radius: var(--radius);
    padding: 28px 32px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
}

.paper-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--accent-light);
}

.paper-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    background: rgba(201, 169, 110, 0.15);
    color: var(--accent);
    margin-bottom: 12px;
}

.paper-tag.published {
    background: rgba(30, 136, 80, 0.12);
    color: #2e7d32;
}

.paper-card h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
    line-height: 1.5;
}

.paper-authors {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.paper-venue {
    font-size: 13px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 12px;
}

.paper-abstract {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
    line-height: 1.6;
}

.paper-links {
    display: flex;
    gap: 16px;
}

.paper-links a {
    font-size: 13px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.paper-links a:hover {
    color: var(--accent);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.project-card {
    background: white;
    border-radius: var(--radius);
    padding: 32px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-light);
}

.project-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 22px;
    margin-bottom: 20px;
}

.project-card h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 10px;
}

.project-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 18px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    font-size: 12px;
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--bg-alt);
    color: var(--text-light);
    font-weight: 500;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px;
}

.skill-category h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-category h3 i {
    color: var(--accent);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    padding: 8px 18px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 14px;
    color: var(--text-light);
    font-weight: 500;
    transition: var(--transition);
    cursor: default;
}

.skill-tag:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

.contact-intro {
    text-align: center;
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 48px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 32px 20px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.contact-card i {
    font-size: 28px;
    color: var(--primary);
    margin-bottom: 8px;
    transition: var(--transition);
}

.contact-card:hover i {
    color: var(--accent);
    transform: scale(1.1);
}

.contact-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: 600;
}

.contact-value {
    font-size: 14px;
    color: var(--text);
    font-weight: 500;
    text-align: center;
}

.footer {
    padding: 32px 0;
    background: var(--text);
    color: rgba(255, 255, 255, 0.7);
    text-align: center;
    font-size: 14px;
}

.footer i {
    color: #e57373;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.awards-group {
    margin-bottom: 56px;
}

.awards-group:last-child {
    margin-bottom: 0;
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.award-card {
    background: white;
    border-radius: var(--radius);
    padding: 24px 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.award-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent) 0%, var(--primary) 100%);
}

.award-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.award-rank {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 8px;
}

.award-card h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    line-height: 1.45;
}

.award-card p {
    font-size: 13px;
    color: var(--text-muted);
}

.scholarship-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.scholarship-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 18px 22px;
    background: white;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.scholarship-item:hover {
    border-color: var(--accent-light);
    box-shadow: var(--shadow-sm);
    transform: translateX(4px);
}

.scholarship-item i {
    color: var(--accent);
    font-size: 18px;
    margin-top: 2px;
    flex-shrink: 0;
}

.scholarship-item div {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.scholarship-item strong {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
}

.scholarship-item span {
    font-size: 13px;
    color: var(--text-muted);
}

.award-card-photo {
    padding: 0;
    overflow: hidden;
}

.award-card-photo .award-rank,
.award-card-photo h4,
.award-card-photo p {
    padding-left: 20px;
    padding-right: 20px;
}

.award-card-photo .award-rank {
    padding-top: 16px;
}

.award-card-photo h4 {
    padding-bottom: 4px;
}

.award-card-photo p {
    padding-bottom: 20px;
}

.award-img {
    position: relative;
    width: 100%;
    height: 180px;
    overflow: hidden;
    background: var(--bg-alt);
    cursor: zoom-in;
}

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

.award-card-photo:hover .award-img img {
    transform: scale(1.06);
}

.award-img-overlay {
    position: absolute;
    inset: 0;
    background: rgba(30, 58, 95, 0);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    color: white;
    font-size: 24px;
}

.award-img:hover .award-img-overlay {
    background: rgba(30, 58, 95, 0.55);
    opacity: 1;
}

.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    cursor: zoom-out;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 40px;
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    max-width: 90vw;
    max-height: 80vh;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: lightboxIn 0.3s ease-out;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 36px;
    font-size: 40px;
    color: white;
    font-weight: 300;
    line-height: 1;
    cursor: pointer;
    transition: var(--transition);
}

.lightbox-close:hover {
    color: var(--accent);
    transform: rotate(90deg);
}

.lightbox-caption {
    margin-top: 16px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
}

@keyframes lightboxIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        transform: translateY(-120%);
        transition: var(--transition);
    }

    .nav-menu.open {
        transform: translateY(0);
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .section {
        padding: 70px 0;
    }

    .timeline {
        padding-left: 32px;
    }

    .hero {
        padding-top: 100px;
    }

    .avatar {
        width: 90px;
        height: 90px;
        font-size: 36px;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 240px;
        justify-content: center;
    }

    .paper-card {
        padding: 24px 20px;
    }

    .project-card {
        padding: 24px;
    }
}


/* UAV project media */
.project-actions {
    margin-top: 20px;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--accent);
}

.uav-gallery-intro {
    margin: -8px 0 22px;
    color: var(--text-light);
    font-size: 14px;
}

.uav-media-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.uav-media-item {
    min-width: 0;
    margin: 0;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #fff;
}

.uav-media-item img,
.uav-media-item video {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    background: #101820;
}

.uav-media-item figcaption {
    padding: 12px 16px;
    color: var(--text-light);
    font-size: 13px;
}

@media (max-width: 600px) {
    .uav-media-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
}


.award-certificate {
    max-width: 680px;
    margin: 24px 0 0;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #fff;
    box-shadow: var(--shadow-sm);
}

.award-certificate img {
    display: block;
    width: 100%;
    height: auto;
    cursor: zoom-in;
}

.award-certificate figcaption {
    padding: 12px 16px;
    color: var(--text-muted);
    font-size: 13px;
}

.ue5-photo-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.ue5-photo-item {
    min-width: 0;
    margin: 0;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: #fff;
}

.ue5-photo-item img {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    cursor: zoom-in;
}

.ue5-photo-item figcaption {
    padding: 12px 14px;
    color: var(--text-light);
    font-size: 13px;
}

.ue5-logo-item img {
    object-fit: contain;
    background: #080808;
}

@media (max-width: 900px) {
    .ue5-photo-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 600px) {
    .ue5-photo-grid {
        gap: 14px;
    }
}

/* Shared visual system for the portfolio pages */
:root {
    --primary: #243b43;
    --primary-light: #49646b;
    --accent: #bd805b;
    --accent-light: #ead4c5;
    --bg: #f7f6f2;
    --bg-alt: #efeee8;
    --text: #202d30;
    --text-light: #58676a;
    --text-muted: #7d898a;
    --border: #e1e0d8;
    --shadow-sm: 0 3px 12px rgba(31, 45, 46, .05);
    --shadow-md: 0 14px 38px rgba(31, 45, 46, .08);
    --shadow-lg: 0 20px 54px rgba(31, 45, 46, .13);
    --radius: 16px;
    --radius-sm: 12px;
    --container: 1080px;
}

body.portfolio-page {
    background: var(--bg);
    font-family: 'DM Sans', 'Inter', sans-serif;
}

.portfolio-page .navbar {
    background: rgba(247, 246, 242, .92);
    border-bottom: 1px solid rgba(225, 224, 216, .8);
}

.portfolio-page .nav-container { height: 72px; }
.portfolio-page .nav-logo { font-size: 25px; }
.portfolio-page .nav-menu { gap: 30px; }
.portfolio-page .nav-link { font-size: 14px; letter-spacing: .01em; }
.portfolio-page .nav-link::after { height: 1px; }
.portfolio-page .hamburger { border: 0; background: transparent; }

.portfolio-page .hero {
    min-height: min(760px, 100vh);
    padding-top: 118px;
    padding-bottom: 80px;
}

.portfolio-page .hero-bg {
    background:
        radial-gradient(ellipse at 16% 25%, rgba(189, 128, 91, .12), transparent 42%),
        radial-gradient(ellipse at 83% 78%, rgba(73, 100, 107, .11), transparent 44%),
        linear-gradient(145deg, #f5f3ed 0%, #fbfaf7 54%, #f1f0e9 100%);
}

.portfolio-page .hero-bg::before {
    background-image: linear-gradient(rgba(36, 59, 67, .035) 1px, transparent 1px), linear-gradient(90deg, rgba(36, 59, 67, .035) 1px, transparent 1px);
    background-size: 52px 52px;
    mask-image: linear-gradient(to bottom, black, transparent 90%);
    opacity: .45;
}

.portfolio-page .hero-content { max-width: 760px; }
.portfolio-page .avatar { border: 5px solid rgba(255,255,255,.78); box-shadow: 0 18px 46px rgba(36,59,67,.14); }
.portfolio-page .hero-name { font-size: clamp(44px, 7vw, 72px); letter-spacing: -.045em; margin-bottom: 12px; }
.portfolio-page .hero-subtitle { color: var(--text-light); font-size: clamp(15px, 1.8vw, 18px); letter-spacing: .035em; margin: 0 auto 32px; max-width: 620px; }
.portfolio-page .hero-actions { margin-bottom: 24px; }
.portfolio-page .btn { border-radius: 999px; padding: 13px 24px; }
.portfolio-page .btn-primary { background: var(--primary); box-shadow: 0 8px 20px rgba(36,59,67,.16); }
.portfolio-page .btn-outline { border: 1px solid rgba(36,59,67,.35); }

.page-masthead {
    padding: 150px 0 76px;
    background: radial-gradient(ellipse at 82% 5%, rgba(189,128,91,.12), transparent 35%), linear-gradient(150deg,#f1f0e9,#faf9f5 65%);
    border-bottom: 1px solid var(--border);
}

.page-masthead .container { max-width: 850px; }
.page-masthead .eyebrow, .eyebrow { color: var(--accent); font-size: 11px; font-weight: 700; letter-spacing: .19em; }
.page-masthead h1 { margin: 12px 0 10px; font: 600 clamp(42px, 7vw, 68px)/1.05 'Playfair Display', Georgia, serif; letter-spacing: -.035em; }
.page-masthead p:last-child { max-width: 600px; color: var(--text-light); font-size: 17px; }

.portfolio-page .section { padding: 80px 0; }
.portfolio-page .section:nth-child(even) { background: transparent; }
.portfolio-page .section-title { text-align: left; margin: 0 0 34px; font-size: clamp(29px,4vw,38px); letter-spacing: -.025em; }
.portfolio-page .section-title::after { margin: 14px 0 0; width: 42px; height: 2px; }
.portfolio-page .about-grid { grid-template-columns: minmax(0,1.55fr) minmax(260px,.8fr); gap: clamp(34px,7vw,88px); }
.portfolio-page .about-text p { max-width: 680px; color: var(--text-light); line-height: 1.9; }
.portfolio-page .about-text strong { color: var(--text); }
.portfolio-page .info-card, .portfolio-page .timeline-content, .portfolio-page .paper-card, .portfolio-page .project-card, .portfolio-page .skill-category, .portfolio-page .contact-card, .portfolio-page .award-card, .portfolio-page .scholarship-item, .portfolio-page .ue5-photo-item, .portfolio-page .uav-media-item {
    border-color: var(--border);
    box-shadow: var(--shadow-sm);
}
.portfolio-page .timeline::before { background: #deddd4; }
.portfolio-page .timeline-dot { box-shadow: 0 0 0 4px var(--bg); }
.portfolio-page .timeline-title { color: var(--text); }
.portfolio-page .subsection-title { color: var(--primary); }
.portfolio-page .paper-card, .portfolio-page .project-card, .portfolio-page .skill-category, .portfolio-page .contact-card, .portfolio-page .scholarship-item { border-radius: var(--radius); }
.portfolio-page .paper-card { padding: clamp(24px,4vw,38px); }
.portfolio-page .project-card { padding: 28px; }
.portfolio-page .project-card h4 { line-height: 1.4; }
.portfolio-page .uav-media-item, .portfolio-page .ue5-photo-item { border-radius: var(--radius); }
.portfolio-page .uav-media-item img, .portfolio-page .uav-media-item video, .portfolio-page .ue5-photo-item img { background-color: #e8e7df; }
.portfolio-page .award-card-photo .award-img img { aspect-ratio: 4 / 3; object-fit: cover; }
.portfolio-page .scholarship-item { align-items: center; }
.portfolio-page .certificate-preview { margin-left: auto; flex: 0 0 84px; width: 84px; padding: 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: #fff; cursor: zoom-in; }
.portfolio-page .certificate-preview img { display: block; width: 100%; height: 60px; object-fit: cover; }
.portfolio-page .footer { padding: 28px 0; background: #243b43; font-size: 13px; letter-spacing: .02em; }
.portfolio-page .footer span { color: #d69b75; padding: 0 5px; }
.single-project { max-width: 760px; }

.home-next { padding: 0 0 88px; }
.home-next .eyebrow { margin-bottom: 14px; }
.home-link-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-top: 1px solid var(--border); }
.home-link-grid a { min-height: 76px; display:flex; align-items:center; gap:16px; padding: 18px 12px 18px 0; border-bottom:1px solid var(--border); color:var(--text); text-decoration:none; }
.home-link-grid a + a { padding-left: 22px; border-left:1px solid var(--border); }
.home-link-grid span { font-size:11px; color:var(--accent); letter-spacing:.12em; }
.home-link-grid strong { font:600 19px 'Playfair Display',Georgia,serif; }
.home-link-grid i { margin-left:auto; color:var(--text-muted); transition:transform .2s ease; }
.home-link-grid a:hover i { transform:translateX(5px); }

.reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 768px) {
    .portfolio-page .nav-container { height: 66px; }
    .portfolio-page .nav-menu { top: 66px; gap: 17px; background: rgba(247,246,242,.98); }
    .page-masthead { padding: 125px 0 52px; }
    .portfolio-page .section { padding: 60px 0; }
    .portfolio-page .about-grid { grid-template-columns: 1fr; gap: 28px; }
    .home-link-grid { grid-template-columns: 1fr; }
    .home-link-grid a + a { padding-left: 0; border-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
    .reveal { opacity: 1; transform: none; }
}

.home-overview { padding-top: 28px; }
.home-overview > .container > .eyebrow { margin: 0 0 12px; }
.home-overview .section-title { margin-bottom: 30px; }
.home-work-list { border-top: 1px solid var(--border); }
.home-work-item { display: grid; grid-template-columns: minmax(130px,.42fr) minmax(190px,.72fr) minmax(0,1.45fr); align-items: center; gap: clamp(20px,3.5vw,48px); padding: 30px 0 32px; border-bottom: 1px solid var(--border); }
.home-work-item--certificates { grid-template-columns: minmax(130px,.42fr) minmax(190px,.72fr) minmax(0,1.45fr); }
.home-work-certificates { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; align-items: center; }
.home-work-certificate { display: block; width: 100%; padding: 0; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; background: #fff; cursor: zoom-in; }
.home-work-certificate img { display: block; width: 100%; aspect-ratio: 1.42; object-fit: contain; transition: transform .3s ease; }
.home-work-certificate:hover img { transform: scale(1.035); }
.home-work-image { display: block; overflow: hidden; border-radius: 8px; background: #e8e4dc; aspect-ratio: 16 / 10; }
.home-work-image img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.home-work-image:hover img { transform: scale(1.035); }
.home-work-type { margin: 4px 0 0; color: var(--accent); font-size: 11px; font-weight: 700; letter-spacing: .13em; line-height: 1.9; }
.home-work-copy h3 { margin: 0 0 10px; color: var(--text); font: 600 clamp(21px,2.5vw,27px)/1.25 'Playfair Display',Georgia,serif; }
.home-work-copy p { max-width: 700px; margin: 0 0 14px; color: var(--text-light); line-height: 1.8; }
.home-work-actions { display: flex; flex-wrap: wrap; gap: 22px; }
.home-work-link { display: inline-flex; align-items: center; gap: 9px; color: var(--primary); font-size: 14px; font-weight: 600; text-decoration: none; }
.home-work-link i { color: var(--accent); transition: transform .2s ease; }
.home-work-link:hover i { transform: translateX(4px); }
@media (max-width: 760px) { .home-work-item, .home-work-item--certificates { grid-template-columns: minmax(110px,.45fr) minmax(0,1fr); gap: 12px 20px; padding: 24px 0 27px; } .home-work-type { grid-column: 1 / -1; display: flex; gap: 14px; } .home-work-type br { display: none; } .home-work-image, .home-work-certificates { grid-column: 1; grid-row: 2 / span 1; align-self: start; } .home-work-copy { grid-column: 2; grid-row: 2; } }
@media (max-width: 760px) { .home-work-item--certificates { grid-template-columns: minmax(0,1fr); } .home-work-item--certificates .home-work-type, .home-work-item--certificates .home-work-certificates, .home-work-item--certificates .home-work-copy { grid-column: 1; grid-row: auto; } .home-work-certificates { max-width: 420px; } }
@media (max-width: 480px) { .home-work-item { grid-template-columns: 1fr; } .home-work-image, .home-work-certificates, .home-work-copy { grid-column: 1; grid-row: auto; } .home-work-image { max-height: 220px; } }
.award-img.award-certificate { height: auto; width: 100%; border: 0; padding: 0; display: block; background: #fff; }
.portfolio-page .award-card-photo .award-img.award-certificate img { display: block; width: 100%; height: auto; aspect-ratio: 1.42; object-fit: contain; }