/* /Users/qiansui/Desktop/xinyihan/personalwebsite/styles.css */
/* Main stylesheet for Xinyi Han's portfolio website */
/* Provides comprehensive styling for all page components and responsive design */

:root {
    --primary-color: #000000;
    --secondary-color: #666666;
    --accent-color: #000000;
    --background-color: #ffffff;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --border-color: #dddddd;
    --hover-color: #f0f0f0;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    
    --border-radius: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--primary-color);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation Header */
.nav-header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    padding: var(--spacing-sm) 0;
}

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

.nav-left .name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.nav-left .name .name-link {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: var(--transition);
}

.nav-left .name .name-link:hover {
    color: var(--accent-color);
}

.nav-left .title {
    font-size: var(--font-size-sm);
    color: var(--secondary-color);
    font-weight: 400;
    letter-spacing: 0.5px;
}

.nav-right {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.5px;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--accent-color);
    transition: var(--transition);
}

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

/* Hero Section */
.hero-section {
    padding: var(--spacing-2xl) 0;
    background-color: var(--background-color);
}

.hero-content {
    max-width: 800px;
}

.hero-text {
    font-size: var(--font-size-xl);
    line-height: 1.5;
    font-weight: 400;
    color: var(--primary-color);
    margin: 0;
}

/* Project Pages: Global hero + brief styles */
.hero-image-container {
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image {
    width: 100%;
    aspect-ratio: 2 / 1;
    object-fit: cover;
    display: block;
}

.project-brief-container {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
    background-color: #ffffff;
}

.project-brief {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 30px;
}

.brief-grid {
    display: grid;
    grid-template-columns: minmax(120px, 0.8fr) minmax(320px, 1.5fr) minmax(180px, 1.2fr) minmax(200px, 1.2fr);
    gap: var(--spacing-lg);
    text-align: left;
}

.brief-item { display: flex; flex-direction: column; gap: var(--spacing-xs); }
.brief-label { font-size: 12px; font-weight: 400; color: #999999; text-align: left; margin-bottom: 4px; }
.brief-content { font-size: var(--font-size-base); color: var(--primary-color); font-weight: 500; overflow-wrap: anywhere; }

/* Projects Navigation */
.projects-nav {
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--background-color);
}

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

.project-tabs {
    display: flex;
    gap: var(--spacing-sm);
}

.tab-btn {
    background: none;
    border: none;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--secondary-color);
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-family: var(--font-family);
}

.tab-btn.active {
    color: var(--primary-color);
    background-color: var(--light-gray);
}

.tab-btn:hover:not(.active) {
    color: var(--primary-color);
    background-color: var(--hover-color);
}

.project-filters {
    display: flex;
    gap: var(--spacing-md);
}

.filter-tag {
    font-size: var(--font-size-sm);
    color: var(--secondary-color);
    font-weight: 500;
}


/* Gallery View */
.gallery-view {
    padding: var(--spacing-xl) 0;
    background-color: var(--background-color);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.project-card {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border-color: var(--medium-gray);
}

.project-card.featured {
    grid-column: span 2;
}

.project-card.clickable {
    position: relative;
}

.project-card.clickable::after {
    content: "Click to view";
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 8px;
    font-size: 12px;
    border-radius: 4px;
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.project-card.clickable:hover::after {
    opacity: 1;
}

.gallery-view .project-image {
    aspect-ratio: 16/9;
    overflow: hidden;
    position: relative;
    background-color: var(--light-gray);
}

.gallery-view .project-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    display: block;
    transition: var(--transition);
}

/* Alternative display mode for better coverage */
.gallery-view .project-image.cover-mode img {
    object-fit: cover;
}

/* For images that need full container coverage without distortion */
.gallery-view .project-image.fill-mode {
    aspect-ratio: auto;
    min-height: 200px;
}

.gallery-view .project-image.fill-mode img {
    object-fit: contain;
    height: auto;
    min-height: 200px;
}

.placeholder-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--light-gray), var(--medium-gray));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

/* Placeholder image variations */
.placeholder-image.google-labs {
    background: linear-gradient(135deg, #ea4335, #fbbc04, #34a853, #4285f4);
}

.placeholder-image.portrait {
    background: linear-gradient(135deg, #ffecd2, #fcb69f);
}

.placeholder-image.nature {
    background: linear-gradient(135deg, #a8edea, #fed6e3);
}

.placeholder-image.spotify {
    background: linear-gradient(135deg, #1db954, #1ed760);
}

.placeholder-image.shapes {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.placeholder-image.portrait-2 {
    background: linear-gradient(135deg, #f093fb, #f5576c);
}

.placeholder-image.devices {
    background: linear-gradient(135deg, #4facfe, #00f2fe);
}

.placeholder-image.yellow {
    background: linear-gradient(135deg, #ffecd2, #fcb69f);
    color: var(--primary-color);
    font-weight: 600;
    font-size: var(--font-size-xl);
}

.placeholder-image.data-viz {
    background: linear-gradient(135deg, #a8edea, #fed6e3);
}

.placeholder-image.landscape {
    background: linear-gradient(135deg, #d299c2, #fef9d7);
}

.project-info {
    padding: var(--spacing-md);
}

.project-info h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
}

.project-info p {
    font-size: var(--font-size-sm);
    color: var(--secondary-color);
    font-weight: 400;
}

/* Project pages: ensure body images keep natural aspect ratio */
.project-content img.project-image {
    width: 100%;
    height: auto;
    aspect-ratio: auto;
}

.project-content .project-image-scaled {
    display: block;
    max-width: 100%;
    height: auto;
    margin: var(--spacing-lg) 0;
    border-radius: var(--border-radius);
    box-shadow: none;
}

.project-content[data-layout="stacked"] .project-image-scaled {
    margin-left: auto;
    margin-right: auto;
}

.project-content[data-layout="two-column"] .project-image-scaled {
    margin-left: 0;
    margin-right: auto;
}

/* Index View */
.index-view {
    padding: var(--spacing-xl) 0;
    background-color: var(--background-color);
}

.projects-table {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.table-header {
    display: grid;
    grid-template-columns: 80px minmax(200px, 2fr) minmax(180px, 1.5fr) minmax(120px, 1fr);
    gap: var(--spacing-md);
    align-items: center;
    padding: var(--spacing-md);
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-sm);
}

.project-row {
    display: grid;
    grid-template-columns: 80px minmax(200px, 2fr) minmax(180px, 1.5fr) minmax(120px, 1fr);
    gap: var(--spacing-md);
    align-items: center;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
}

.project-row:hover {
    background-color: var(--light-gray);
}

.project-row .year {
    font-size: var(--font-size-sm);
    color: var(--secondary-color);
    font-weight: 500;
}

.project-row .project-name {
    font-size: var(--font-size-base);
    color: var(--primary-color);
    font-weight: 500;
}

.project-row .project-tag {
    font-size: var(--font-size-sm);
    color: var(--secondary-color);
}

.project-row .company {
    font-size: var(--font-size-sm);
    color: var(--secondary-color);
}

/* Classification dot styles */
.classification-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-left: 8px;
    vertical-align: middle;
}

.dot-ux-product {
    background-color: #49B3FF; /* UX/Product */
}

.dot-experiential {
    background-color: #7C3FFF; /* Experiential */
}

.dot-content {
    background-color: #FD3D9A; /* Content */
}

.dot-visual {
    background-color: #FEAF05; /* Visual */
}

.dot-design-work {
    background-color: #6366f1; /* Indigo color for Design Work */
}

.dot-social-media {
    background-color: #ec4899; /* Pink color for Social Media */
}

.dot-default {
    background-color: var(--secondary-color); /* Default gray color */
}

/* Contact Section */
.contact-section {
    background-color: var(--light-gray);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.social-link {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 400;
    transition: var(--transition);
}

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

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

.contact-text {
    font-size: var(--font-size-xl);
    line-height: 1.4;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
}

.email-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

.contact-right {
    text-align: right;
}

.location {
    font-size: var(--font-size-base);
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.time {
    font-size: var(--font-size-sm);
    color: var(--secondary-color);
    font-weight: 400;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    /* Project pages hero/brief responsive */
    .hero-image-container {
        width: 100%;
        margin-left: 0;
        overflow: hidden;
        height: 50vw;
    }
    .hero-image-container .hero-image {
        width: 100%;
        height: 100%;
        aspect-ratio: 2 / 1;
        object-fit: cover;
        object-position: center center;
    }
    .project-brief-container { padding: var(--spacing-sm) 0; }
    .project-brief { max-width: 900px; padding: 0 20px; }
    .brief-grid { grid-template-columns: repeat(2, 1fr); gap: var(--spacing-md); text-align: left; }
    .brief-label { font-size: 11px; }
    .brief-content { font-size: var(--font-size-sm); font-weight: 500; }
    
    .nav-header .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-left {
        text-align: center;
    }
    
    .hero-section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-text {
        font-size: var(--font-size-lg);
    }
    
    .projects-nav .container {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .project-card.featured {
        grid-column: span 1;
    }

    /* Optimize gallery card image display for mobile */
    .gallery-view .project-image {
        aspect-ratio: unset;
        height: auto;
        min-height: 200px;
        max-height: 400px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .gallery-view .project-image img {
        object-fit: contain;
        width: 100%;
        height: auto;
        max-height: 400px;
    }
    
    .project-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
        text-align: left;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .contact-right {
        text-align: center;
    }

    .social-links {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    /* Index view: hide header labels and prevent horizontal scroll on mobile */
    .index-view .table-header {
        display: none;
    }
    .index-view,
    .index-view .container,
    .projects-table,
    .project-row {
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
    }
    .project-row span {
        min-width: 0;
    }
    .project-row .project-name,
    .project-row .project-tag,
    .project-row .company {
        overflow-wrap: anywhere;
        word-break: break-word;
    }
}

@media (max-width: 480px) {
    .hero-text {
        font-size: var(--font-size-base);
    }
    
    /* Project pages hero/brief small screens */
    .brief-grid { grid-template-columns: 1fr; gap: var(--spacing-sm); }
    
    .contact-text {
        font-size: var(--font-size-lg);
    }
    
    .gallery-grid {
        gap: var(--spacing-sm);
    }
    
    /* Further optimize gallery card image display for very small screens */
    .gallery-view .project-image {
        min-height: 180px;
        max-height: 350px;
    }
    
    .gallery-view .project-image img {
        max-height: 350px;
    }
    
    .project-info {
        padding: var(--spacing-sm);
    }
}

/* Animation utilities */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Focus states for accessibility */
.tab-btn:focus,
.nav-link:focus,
.email-link:focus,
.social-link:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .nav-header,
    .contact-section {
        display: none;
    }
    
    .hero-section,
    .gallery-view,
    .index-view {
        padding: var(--spacing-sm) 0;
    }
}