:root {
    /* Color Palette - Muted, aged-paper */
    --bg-color: #faf7ee;
    --card-bg: #f7f2e4;
    --text-primary: #1c1c1a;
    --text-secondary: #5c5850;
    --accent-color: #1d3557;
    /* Muted ink navy — used only for genuine links */
    --accent-hover: #12233c;
    --border-color: #ece4d1;

    /* Spacing */
    --container-width: 1200px;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;

    /* Typography */
    --font-main: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

ul {
    list-style: none;
}

/* Layout Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.grid {
    display: grid;
    gap: var(--spacing-md);
}

/* Header */
header {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.2rem;
    font-weight: 600;
    font-family: var(--font-main);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
}

.main-nav ul {
    display: flex;
    gap: var(--spacing-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
}

.nav-links a:hover,
.main-nav a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* Hero Section */
.hero {
    padding: var(--spacing-lg) 0 var(--spacing-md) 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.profile-pic {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-md);
}

.hero h1 {
    font-size: 2.4rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    max-width: 780px;
    line-height: 1.3;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 0;
}

/* Projects Section */
.projects {
    padding: var(--spacing-lg) 0;
}

/* Experience Section */
.experience {
    padding: var(--spacing-md) 0;
}

.experience-list {
    display: flex;
    flex-direction: column;
}

.experience-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.experience-logo {
    width: 56px;
    height: 56px;
    object-fit: contain;
    border-radius: 3px;
    flex-shrink: 0;
}

.experience-info h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    font-family: var(--font-main);
}

.experience-role {
    font-size: 0.92rem;
    color: var(--text-secondary);
    font-family: var(--font-sans);
}

.experience-date {
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    margin-top: 0.25rem;
}

.section-title {
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    border-left: none;
    padding-left: 0;
    padding-bottom: 0.6rem;
    margin-bottom: 1.75rem;
    border-bottom: 1px solid var(--border-color);
}

.project-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.project-card {
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    overflow: hidden;
    transition: border-color 0.2s ease;
    width: 320px;
    flex-shrink: 0;
}

.project-card:hover {
    border-color: var(--text-secondary);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.card-image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--text-primary);
}

.card-image-label {
    color: var(--bg-color);
    font-family: 'Courier New', Courier, monospace;
    font-size: 1rem;
    letter-spacing: 0.02em;
}

.card-content {
    padding: var(--spacing-md);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.6rem;
}

.card-desc {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.btn {
    display: inline-block;
    padding: 0;
    background-color: transparent;
    color: var(--accent-color);
    border-radius: 0;
    font-weight: 500;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    text-decoration: underline;
    text-underline-offset: 3px;
}

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

/* Project Detail Gallery */
.gallery-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.gallery-item {
    break-inside: avoid;
    width: 280px;
    flex-shrink: 0;
}

.gallery-item img,
.gallery-item video {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 2px;
    border: 1px solid var(--border-color);
    display: block;
    background-color: var(--card-bg);
}

.caption {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    color: var(--text-secondary);
    text-align: center;
}

.subtitle {
    font-size: 1.05rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.project-intro {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.8;
}

/* Footer */

footer {
    padding: var(--spacing-lg) 0;
    text-align: center;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-lg);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .container {
        padding-left: 1.25rem;
        padding-right: 1.25rem;
    }

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

    .experience-item {
        gap: 1rem;
        padding: 1rem 0;
    }

    .experience-logo {
        width: 44px;
        height: 44px;
    }

    .project-card {
        width: 100%;
    }

    .gallery-item {
        width: 100%;
    }

    .tech-item {
        width: 100%;
    }
}

/* Project Detail Refinements */
.project-intro p {
    font-size: 1.15rem;
    text-align: left;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.project-intro {
    max-width: 1000px;
    margin: 0 auto var(--spacing-lg);
}

/* Visible Hyperlinks */
.project-links a,
.project-intro a {
    color: var(--accent-color);
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: 500;
    font-size: 1rem;
}

.project-links a:hover,
.project-intro a:hover {
    color: var(--accent-hover);
}

/* Awards Section */
.project-awards h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.awards-list li {
    font-size: 1.05rem;
    margin-bottom: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.awards-list li strong {
    color: var(--text-primary);
}

.project-awards {
    margin-bottom: 4rem;
}


/* Technical Details Section */
.tech-details {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.tech-item {
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: 1.5rem;
    width: 280px;
    flex-shrink: 0;
    transition: border-color 0.2s ease;
}

.tech-item:hover {
    border-color: var(--text-secondary);
}

.tech-item h3 {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.tech-item p {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.7;
}


/* Tech Stack / Keyword Tags */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: var(--spacing-md);
    font-family: var(--font-sans);
}

.tech-tag {
    background-color: transparent;
    color: var(--text-secondary);
    padding: 0;
    border-radius: 0;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    border: none;
}

.tech-tag:not(:last-child)::after {
    content: "\00a0\00b7\00a0";
    color: var(--border-color);
}

/* Card Tags (Index Page) */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-sans);
}

.card-tag {
    display: inline-block;
    background-color: transparent;
    color: var(--text-secondary);
    padding: 0;
    border-radius: 0;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border: none;
    white-space: nowrap;
}

.card-tag:not(:last-child)::after {
    content: "\00a0\00b7\00a0";
    color: var(--border-color);
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1.5rem;
    margin-top: var(--spacing-sm);
    font-family: var(--font-sans);
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0;
    border: none;
    border-radius: 0;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.social-btn:hover {
    color: var(--accent-color);
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* Inline Button (within text) */
.inline-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0;
    margin: 0 0.15rem;
    border: none;
    border-radius: 0;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-color);
    vertical-align: middle;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.inline-btn:hover {
    color: var(--accent-hover);
}


/* Description Section */
.project-description {
    margin-bottom: var(--spacing-lg);
}

.project-description p {
    font-size: 1.08rem;
    line-height: 1.9;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    max-width: 900px;
}

.project-description p a {
    color: var(--accent-color);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.project-description p a:hover {
    color: var(--accent-hover);
}

.project-description .project-links {
    margin-top: var(--spacing-md);
}

/* Math Sections */
.math-section h3 {
    font-family: var(--font-sans);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.math-block {
    overflow-x: auto;
    padding: 1rem 0;
    margin: 1rem 0;
    text-align: center;
}

.pipeline-list {
    list-style: decimal;
    padding-left: 1.5rem;
}

.pipeline-list li {
    font-size: 1.02rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.7;
}

/* Photography Viewer */
.photo-viewer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: var(--spacing-md);
    width: 100%;
    max-width: 100%;
}

.photo-stage {
    flex: 1 1 auto;
    min-width: 0;
    max-width: 1000px;
    display: flex;
    justify-content: center;
}

.photo-stage img {
    max-width: 100%;
    max-height: 75vh;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 2px;
    border: 1px solid var(--border-color);
}

.photo-nav {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 2px;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-primary);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s ease, color 0.2s ease;
}

.photo-nav:hover {
    border-color: var(--text-secondary);
    color: var(--accent-color);
}

.photo-counter {
    text-align: center;
    font-family: var(--font-sans);
    color: var(--text-secondary);
    margin-top: 1rem;
    font-size: 0.88rem;
}

@media (max-width: 768px) {
    .photo-nav {
        width: 36px;
        height: 36px;
        font-size: 1.3rem;
    }

    .photo-viewer {
        gap: 0.5rem;
    }
}

/* Photography Feature (homepage) */
.photo-feature {
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

.photo-feature-link {
    display: block;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.photo-feature-img {
    display: block;
    width: 100%;
    height: 300px;
    object-fit: cover;
}

.photo-feature-caption {
    margin-top: 1rem;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.photo-feature-caption a {
    color: var(--accent-color);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.photo-feature-caption a:hover {
    color: var(--accent-hover);
}

@media (max-width: 768px) {
    .photo-feature-img {
        height: 200px;
    }
}