:root {
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f8f8;
    --color-bg-card: #f0f0f0;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-accent: #d4a84b;
    --color-accent-accessible: #7a5a12;
    --color-accent-light: #e8c47c;
    --color-tag-bg: #FCFAF3;
    --color-tag-text: #4f4015;
    --color-tag-border: #e4d5a4;
    --color-border: rgba(0, 0, 0, 0.1);
    --color-overlay: rgba(255, 255, 255, 0.85);
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.4s var(--transition-smooth), color 0.4s var(--transition-smooth);
}

::selection {
    background-color: var(--color-accent);
    color: var(--color-bg);
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Prevent layout shift while images load */
img[width][height] {
    aspect-ratio: attr(width) / attr(height);
}

/* Skeleton loading animation */
@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

@keyframes skeleton-shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Project images */
.project-image {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    background-color: var(--color-bg-secondary);
}

.project-image picture {
    display: block;
    width: 100%;
    height: 100%;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--transition-smooth);
}

/* Picture element styling */
picture {
    display: block;
    width: 100%;
    height: 100%;
}

picture img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 4rem;
    background: linear-gradient(to bottom, var(--color-bg), transparent);
    transition: all 0.4s var(--transition-smooth);
}

.header.scrolled {
    background: var(--color-bg);
    backdrop-filter: blur(10px);
    padding: 1rem 4rem;
    box-shadow: 0 1px 0 var(--color-border);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 500;
    letter-spacing: -0.02em;
    transition: opacity 0.3s var(--transition-smooth);
}

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    flex: 0 0 auto;
    object-fit: contain;
}

.logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 3rem;
    align-items: center;
}

.nav-links a {
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    position: relative;
    transition: color 0.3s var(--transition-smooth);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width 0.3s var(--transition-smooth);
}

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

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

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 8rem 4rem 4rem;
    position: relative;
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.hero-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
    margin-bottom: 2rem;
}

.hero-text {
    flex: 1;
    max-width: 100%;
}

.hero-image {
    flex: 0 0 auto;
    max-width: 680px;
    width: 100%;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s var(--transition-smooth) 0.5s forwards;
}

.hero-image img {
    width: 100%;
    max-height: 500px;
    height: auto;
    object-fit: contain;
}

.hero-subtitle {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent-accessible);
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s var(--transition-smooth) 0.2s forwards;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    max-width: 70%;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s var(--transition-smooth) 0.4s forwards;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    line-height: 1.8;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s var(--transition-smooth) 0.6s forwards;
}

.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    opacity: 0;
    animation: fadeIn 1s var(--transition-smooth) 1s forwards;
}

.scroll-indicator span {
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #4a4a4a;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--color-accent-accessible), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

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

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

@keyframes scrollPulse {
    0%, 100% {
        opacity: 0.3;
        transform: scaleY(0.5);
    }
    50% {
        opacity: 1;
        transform: scaleY(1);
    }
}

.section-header {
    max-width: 1400px;
    margin: 0 auto 4rem;
    padding: 0 4rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.section-header-about,
.section-header-contact {
    padding-left: 0;
}

.section-number {
    font-family: var(--font-display);
    font-size: 0.875rem;
    color: var(--color-accent);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    letter-spacing: -0.02em;
}

.work-section {
    padding: 8rem 0;
}

.projects-grid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 4rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4rem 3rem;
}

.project-card {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s var(--transition-smooth),
                transform 0.6s var(--transition-smooth);
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-image {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    background-color: var(--color-bg-secondary);
    margin-bottom: 1.5rem;
    cursor: pointer;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--transition-smooth);
}

.project-image:hover img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.4s var(--transition-smooth);
}

.project-image:hover .project-overlay {
    opacity: 1;
}

.view-project {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text);
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--color-text);
    background-color: rgba(0, 0, 0, 0.4);
    transition: all 0.3s var(--transition-smooth);
}

.project-image:hover .view-project {
    background-color: var(--color-text);
    color: var(--color-bg);
}

.project-info {
    padding-right: 2rem;
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
    line-height: 1.4;
}

.project-description {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.project-tag {
    font-size: 0.8125rem;
    font-weight: 600;
    line-height: 1.35;
    padding: 0.4rem 0.8rem;
    background-color: var(--color-tag-bg);
    border: 1px solid var(--color-tag-border);
    border-radius: 4px;
    color: var(--color-tag-text);
    transition: all 0.3s var(--transition-smooth);
}

[data-theme="dark"] .project-tag {
    color: #1a1a1a;
}

.project-category {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    line-height: 1.45;
    text-transform: uppercase;
    color: var(--color-accent-accessible);
}

.about-section {
    padding: 8rem 4rem;
    background-color: var(--color-bg-secondary);
    transition: background-color 0.4s var(--transition-smooth);
}

.about-content {
    max-width: 1400px;
    margin: 0 auto;
}

.about-text {
    max-width: 70%;
}

.about-intro {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    line-height: 1.4;
    margin-bottom: 2rem;
    font-weight: 400;
}

.about-text p:not(.about-intro) {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-details {
    display: flex;
    gap: 4rem;
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 1px solid var(--color-border);
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.detail-number {
    font-family: var(--font-display);
    font-size: 3.5rem;
    color: var(--color-accent);
}

.detail-label {
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.contact-section {
    padding: 8rem 4rem;
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
}

.contact-item {
    position: relative;
    display: inline-block;
    margin-bottom: 1.5rem;
    cursor: pointer;
}

.contact-item:last-of-type {
    margin-bottom: 3rem;
}

.contact-email {
    font-family: 'Source Code Pro', monospace;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    display: block;
    transition: color 0.3s var(--transition-smooth), transform 0.2s var(--transition-smooth);
}

.contact-phone {
    font-family: 'Source Code Pro', monospace;
    font-size: clamp(1.25rem, 3vw, 2rem);
    display: block;
    transition: color 0.3s var(--transition-smooth), transform 0.2s var(--transition-smooth);
    color: var(--color-text);
}

.contact-item:hover .contact-email,
.contact-item:hover .contact-phone {
    color: var(--color-accent);
    transform: translateY(-2px);
}

.copy-hint {
    position: absolute;
    top: 50%;
    right: -80px;
    transform: translateY(-50%);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    opacity: 0;
    transition: opacity 0.3s var(--transition-smooth);
    pointer-events: none;
    white-space: nowrap;
}

.contact-item:hover .copy-hint {
    opacity: 1;
}

.copy-feedback {
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-bg);
    background-color: var(--color-accent);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s var(--transition-smooth), top 0.3s var(--transition-smooth);
}

.copy-feedback.show {
    opacity: 1;
    top: -40px;
}

.copy-feedback::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--color-accent);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.social-link {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--color-border);
    transition: all 0.3s var(--transition-smooth);
}

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

.footer {
    padding: 2rem 4rem;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.05em;
}

@media (max-width: 1024px) {
    .projects-grid {
        gap: 3rem 2rem;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 1rem 1.5rem;
    }

    .header.scrolled {
        padding: 1rem 1.5rem;
    }

    .nav-links {
        gap: 1.5rem;
    }

    .logo {
        gap: 0.55rem;
    }

    .logo-icon {
        width: 2.5rem;
        height: 2.5rem;
    }

    .nav-links a {
        font-size: 0.75rem;
    }

    .theme-toggle {
        font-size: 0.65rem;
        padding: 0.4rem 0.75rem;
    }

    .theme-toggle .theme-label {
        display: none;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
    }

    .hero-row {
        flex-direction: column;
        gap: 2rem;
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-image {
        max-width: 400px;
    }

    .section-header {
        padding: 0 1.5rem;
        margin-bottom: 3rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        padding: 0 1.5rem;
        gap: 3rem;
    }

    .project-info {
        padding-right: 0;
    }

    .about-section {
        padding: 5rem 1.5rem;
    }

    .about-details {
        flex-wrap: wrap;
        gap: 2rem;
    }

    .contact-section {
        padding: 5rem 1.5rem;
    }

    .social-links {
        flex-wrap: wrap;
    }

    .copy-hint {
        display: none;
    }

    .footer {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .nav-links a {
        display: none;
    }

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

    .detail-number {
        font-size: 2.5rem;
    }
}