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

:root {
    --text: #1a1a1a;
    --text-secondary: #555;
    --text-muted: #888;
    --bg: #fafafa;
    --bg-card: #fff;
    --border: #e5e5e5;
    --accent: #2563eb;
    --accent-light: #dbeafe;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
nav {
    background: var(--bg-card);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.9);
}

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

.logo {
    font-weight: 700;
    font-size: 16px;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-links a:hover {
    color: var(--text);
    background: var(--border);
}

.nav-links a.active {
    color: var(--accent);
    background: var(--accent-light);
}

/* Main Content */
main {
    padding: 48px 0 80px;
    min-height: calc(100vh - 200px);
}

/* Homepage Hero */
.hero {
    padding: 48px 0 64px;
    text-align: center;
}

.hero h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .tagline {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 28px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.hero-links {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.hero-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.hero-links a:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

/* Section Headers */
h2 {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* About Page */
.about-intro {
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 28px;
    color: var(--text);
}

.highlight-box {
    background: var(--bg-card);
    padding: 16px 20px;
    border-radius: var(--radius);
    margin-bottom: 32px;
    font-size: 13px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--accent);
}

.research-section {
    background: var(--bg-card);
    padding: 16px 20px;
    border-radius: var(--radius);
    margin-bottom: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.research-section:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.research-section h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text);
}

.research-section p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* Publications */
.pub-list {
    list-style: none;
}

.pub-list li {
    background: var(--bg-card);
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    transition: all 0.2s ease;
}

.pub-list li:hover {
    box-shadow: var(--shadow);
}

.pub-title {
    font-weight: 500;
    color: var(--text);
    font-size: 13px;
    text-decoration: none;
    transition: color 0.2s ease;
}

a.pub-title:hover {
    color: var(--accent);
}

.pub-venue {
    color: var(--bg-card);
    background: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
    white-space: nowrap;
}

/* Blog List */
.post-list {
    list-style: none;
}

.post-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.3s ease;
}

.post-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.post-item a {
    text-decoration: none;
    color: var(--text);
    display: block;
    padding: 20px 24px;
}

.post-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    letter-spacing: -0.02em;
}

.post-meta {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 500;
}

.post-excerpt {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Blog Post */
article {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px 36px;
    box-shadow: var(--shadow);
}

.post-header {
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.post-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
}

.post-header .subtitle {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.post-header .meta {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

.post-content {
    font-size: 14px;
    line-height: 1.7;
}

.post-content p {
    margin-bottom: 16px;
}

.post-content h2 {
    font-size: 16px;
    font-weight: 700;
    text-transform: none;
    letter-spacing: -0.02em;
    color: var(--text);
    margin: 32px 0 12px;
}

.post-content h3 {
    font-size: 14px;
    font-weight: 600;
    margin: 24px 0 10px;
}

.post-content img {
    width: calc(100% + 48px);
    margin-left: -24px;
    margin: 32px -24px;
    border-radius: var(--radius-sm);
}

.post-content .caption {
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
    margin-top: -20px;
    margin-bottom: 32px;
    font-style: italic;
}

.post-content blockquote {
    background: linear-gradient(135deg, var(--accent-light) 0%, #f0f9ff 100%);
    border-left: 3px solid var(--accent);
    padding: 16px 18px;
    margin: 20px 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
    color: var(--text-secondary);
    font-size: 13px;
}

.post-content blockquote cite {
    display: block;
    font-size: 11px;
    font-style: normal;
    font-weight: 600;
    color: var(--accent);
    margin-top: 8px;
}

.post-content ul {
    margin: 12px 0 16px 20px;
}

.post-content li {
    margin-bottom: 6px;
    position: relative;
}

.post-content li::marker {
    color: var(--accent);
}

.callout {
    background: var(--bg);
    padding: 14px 18px;
    margin: 16px 0;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.callout h4 {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 4px;
    font-weight: 700;
}

.callout p {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.finding {
    border-left: 3px solid var(--accent);
    padding-left: 16px;
    margin: 16px 0;
}

.finding p {
    margin: 0;
    font-size: 13px;
}

.takeaways {
    background: linear-gradient(135deg, #f8fafc 0%, var(--accent-light) 100%);
    padding: 20px;
    margin: 24px 0;
    border-radius: var(--radius);
    border: 1px solid var(--accent-light);
}

.takeaways h4 {
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--accent);
}

.takeaways ul {
    margin: 0 0 0 16px;
}

.takeaways li {
    font-size: 12px;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.takeaways li:last-child {
    margin-bottom: 0;
}

/* Photography Grid */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.photo-grid img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.photo-grid img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* Footer */
footer {
    padding: 32px 0;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
}

footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-muted);
}

.social-links {
    display: flex;
    gap: 8px;
}

.social-links a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-weight: 500;
}

.social-links a:hover {
    color: var(--accent);
    background: var(--accent-light);
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 0 20px;
    }

    nav .container {
        flex-direction: row;
        flex-wrap: nowrap;
        justify-content: space-between;
        align-items: center;
    }

    .logo {
        font-size: 14px;
    }

    .nav-links {
        gap: 4px;
    }

    .nav-links a {
        padding: 6px 10px;
        font-size: 12px;
    }

    .theme-toggle {
        padding: 6px;
        margin-left: 4px;
    }

    .theme-toggle svg {
        width: 16px;
        height: 16px;
    }

    .hero {
        padding: 32px 0 48px;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero .tagline {
        font-size: 14px;
        margin-bottom: 24px;
    }

    .hero-links {
        gap: 8px;
        flex-wrap: wrap;
    }

    .hero-links a {
        padding: 10px 14px;
        font-size: 12px;
    }

    article {
        padding: 20px;
        border-radius: var(--radius-sm);
    }

    .post-header h1 {
        font-size: 1.5rem;
    }

    .post-content img {
        width: calc(100% + 20px);
        margin-left: -10px;
        margin-right: -10px;
    }

    .photo-grid {
        grid-template-columns: 1fr;
    }

    footer .container {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .social-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 4px;
    }

    .social-links a {
        padding: 6px 10px;
        font-size: 11px;
    }

    .pub-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    main {
        padding: 32px 0 60px;
    }

    .about-intro {
        font-size: 14px;
    }

    .highlight-box {
        font-size: 12px;
        padding: 14px 16px;
    }

    .research-section {
        padding: 14px 16px;
    }

    .research-section h3 {
        font-size: 13px;
    }

    .research-section p {
        font-size: 12px;
    }
}

/* Font import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* Dark Mode */
[data-theme="dark"] {
    --text: #f0f0f0;
    --text-secondary: #a0a0a0;
    --text-muted: #707070;
    --bg: #0a0a0a;
    --bg-card: #151515;
    --border: #2a2a2a;
    --accent: #60a5fa;
    --accent-light: rgba(96, 165, 250, 0.15);
}

[data-theme="dark"] nav {
    background: rgba(10,10,10,0.9);
}

[data-theme="dark"] .hero h1 {
    background: linear-gradient(135deg, #fff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-theme="dark"] .post-content blockquote {
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.1) 0%, rgba(96, 165, 250, 0.05) 100%);
}

[data-theme="dark"] .takeaways {
    background: linear-gradient(135deg, #1a1a1a 0%, rgba(96, 165, 250, 0.1) 100%);
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    margin-left: 8px;
}

.theme-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-light);
}

.theme-toggle.rotating {
    animation: rotate 0.3s ease;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(180deg); }
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

/* Scroll Progress */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, #818cf8 100%);
    z-index: 1000;
    transition: width 0.1s ease;
}

/* Scroll Animations */
.animate-ready {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Page load animation */
body:not(.loaded) main {
    opacity: 0;
}

body.loaded main {
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Lightbox */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox img {
    max-width: 90%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--radius);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.lightbox.active img {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 24px;
    background: transparent;
    border: none;
    color: white;
    font-size: 32px;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s;
    line-height: 1;
}

.lightbox-close:hover {
    opacity: 1;
}

.lightbox-caption {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    margin-top: 16px;
    text-align: center;
}

/* Hover effects enhancement */
.post-item a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.post-item {
    position: relative;
    overflow: hidden;
}

.post-item:hover a::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Interactive hover states */
.research-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.research-section {
    position: relative;
    overflow: hidden;
}

.research-section:hover::before {
    transform: scaleY(1);
}

/* Button hover glow effect */
.hero-links a::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent);
    opacity: 0;
    filter: blur(20px);
    transition: opacity 0.3s ease;
    z-index: -1;
}

.hero-links a {
    position: relative;
}

.hero-links a:hover::before {
    opacity: 0.2;
}