/* Light theme (default) */
:root, [data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #f7f8f9;
    --bg-card-hover: #f0f1f3;
    --border: #e5e7eb;
    --border-light: #d1d5db;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --accent: #14b8a6;
    --accent-dim: #ccfbf1;
    --accent-glow: rgba(20, 184, 166, 0.08);
    --link: #0d9488;
    --link-hover: #0f766e;
    --tag-bg: #f3f4f6;
    --tag-border: #e5e7eb;
    --nav-bg: rgba(255, 255, 255, 0.9);
    --gh-icon-fill: #111827;
}

/* Dark theme */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #161616;
    --bg-card-hover: #1a1a1a;
    --border: #222222;
    --border-light: #2a2a2a;
    --text-primary: #e5e5e5;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --accent: #2dd4bf;
    --accent-dim: #134e4a;
    --accent-glow: rgba(45, 212, 191, 0.1);
    --link: #5eead4;
    --link-hover: #99f6e4;
    --tag-bg: #1e1e1e;
    --tag-border: #333333;
    --nav-bg: rgba(10, 10, 10, 0.85);
    --gh-icon-fill: #e5e5e5;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

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

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

.nav-logo {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 14px;
    color: var(--accent);
    text-decoration: none;
}

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

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
    font-weight: 400;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 8px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s, border-color 0.2s;
}

.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--border-light);
}

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

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Hero Section */
.hero {
    padding: 80px 0 48px;
    border-bottom: 1px solid var(--border);
}

.hero-terminal {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.hero-terminal .prompt {
    color: var(--accent);
}

h1 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 42px;
    font-weight: 700;
    letter-spacing: -1.5px;
    line-height: 1.1;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.5;
}

.hero-links {
    display: flex;
    gap: 20px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.hero-links a {
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.2s;
}

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

.hero-links .icon {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--accent-dim);
    border-radius: 20px;
    font-size: 12px;
    color: var(--accent);
    background: var(--accent-glow);
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.cv-button {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s, border-color 0.2s;
}

.cv-button:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.hero-text {
    flex: 1;
}

.hero-photo {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border);
    flex-shrink: 0;
}

@media (max-width: 640px) {
    .hero-content {
        flex-direction: column-reverse;
        align-items: flex-start;
        gap: 20px;
    }
    .hero-photo {
        width: 100px;
        height: 100px;
    }
}

/* Section Headers */
.section {
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
}

.section-header {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-header::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* Experience Cards */
.exp-card {
    margin-bottom: 36px;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    transition: border-color 0.2s, background 0.2s;
}

.exp-card:hover {
    border-color: var(--border-light);
    background: var(--bg-card-hover);
}

.exp-card:last-child {
    margin-bottom: 0;
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 4px;
    flex-wrap: wrap;
    gap: 8px;
}

.exp-company-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.company-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    object-fit: contain;
    background: #f3f4f6;
    padding: 4px;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

[data-theme="dark"] .company-icon {
    background: #1e1e1e;
    border-color: #333333;
}

.company-icon.round {
    border-radius: 50%;
}

.exp-company {
    font-size: 18px;
    font-weight: 600;
}

.exp-company a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.exp-company a:hover {
    color: var(--accent);
}

.exp-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
}

.exp-role {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.exp-location {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.exp-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.tech-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    padding: 3px 8px;
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
    border-radius: 4px;
    color: var(--text-secondary);
}

.exp-bullets {
    list-style: none;
    padding: 0;
}

.exp-bullets li {
    position: relative;
    padding-left: 16px;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.exp-bullets li::before {
    content: '\25B8';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 12px;
}

.exp-bullets li b {
    color: var(--text-primary);
    font-weight: 600;
}

.exp-bullets li strong {
    color: var(--text-primary);
    font-weight: 600;
}

.exp-bullets li a {
    color: var(--link);
    text-decoration: none;
    border-bottom: 1px dashed var(--link);
    transition: color 0.2s;
}

.exp-bullets li a:hover {
    color: var(--link-hover);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.skill-row {
    display: flex;
    gap: 12px;
    align-items: baseline;
}

.skill-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    min-width: 140px;
    flex-shrink: 0;
}

.skill-value {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Education */
.edu-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 8px;
}

.edu-school {
    font-size: 16px;
    font-weight: 600;
}

.edu-school a {
    color: var(--text-primary);
    text-decoration: none;
}

.edu-school a:hover {
    color: var(--accent);
}

.edu-degree {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.edu-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
}

/* Achievements */
.achievement-list {
    list-style: none;
    padding: 0;
}

.achievement-list li {
    position: relative;
    padding-left: 16px;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.achievement-list li::before {
    content: '\2192';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 12px;
}

.achievement-list li a {
    color: var(--link);
    text-decoration: none;
    border-bottom: 1px dashed var(--link);
}

.achievement-list li a:hover {
    color: var(--link-hover);
}

/* Blog Section */
.blog-grid {
    display: grid;
    gap: 16px;
}

.blog-card {
    padding: 20px 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    transition: border-color 0.2s, background 0.2s;
    text-decoration: none;
    display: block;
}

.blog-card:hover {
    border-color: var(--border-light);
    background: var(--bg-card-hover);
}

.blog-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.blog-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

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

.blog-tags {
    display: flex;
    gap: 6px;
    margin-top: 10px;
}

.blog-empty {
    text-align: center;
    padding: 48px 24px;
    border: 1px dashed var(--border);
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 14px;
}

.blog-empty .terminal-text {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    margin-top: 8px;
    color: var(--accent);
}

/* Footer */
footer {
    padding: 32px 0;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

footer a:hover {
    color: var(--accent);
}

/* Home page cards */
.home-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 32px;
}

.home-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    text-decoration: none;
    transition: border-color 0.2s, background 0.2s, transform 0.2s;
    display: block;
}

.home-card:hover {
    border-color: var(--accent-dim);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}

.home-card-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

.home-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.home-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Home links list */
.home-links {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: 32px;
}

.home-link-item {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    text-decoration: none;
    transition: background 0.2s;
}

.home-link-item:first-child {
    border-top: 1px solid var(--border);
}

.home-link-item:hover {
    background: var(--bg-card);
}

.home-link-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 200px;
    flex-shrink: 0;
}

.home-link-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
    min-width: 80px;
    flex-shrink: 0;
}

.home-link-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

@media (max-width: 640px) {
    .home-link-item {
        flex-direction: column;
        gap: 4px;
    }
    .home-link-title {
        min-width: auto;
    }
}

/* About section on home */
.about-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 640px;
}

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

/* Coursework */
.course-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.course-item {
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-card);
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-grade {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent);
    font-weight: 600;
}

/* Responsive */
@media (max-width: 640px) {
    h1 {
        font-size: 32px;
    }

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

    .section {
        padding: 32px 0;
    }

    .exp-card {
        padding: 16px;
    }

    .skill-row {
        flex-direction: column;
        gap: 4px;
    }

    .skill-label {
        min-width: auto;
    }

    .nav-links {
        gap: 16px;
    }

    .exp-header {
        flex-direction: column;
    }

    .home-cards { grid-template-columns: 1fr; }
    .course-grid { grid-template-columns: 1fr; }
}

/* GitHub/LinkedIn SVG icon fill follows theme */
.hero-links svg[fill="currentColor"] {
    fill: var(--gh-icon-fill);
}

/* Research projects */
.research-card {
    padding: 20px 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    margin-bottom: 16px;
}

.research-card:last-child {
    margin-bottom: 0;
}

.research-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.research-advisor {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Print styles */
@media print {
    body {
        background: white;
        color: #111;
    }

    .exp-card, .edu-card, .blog-card {
        border-color: #ddd;
        background: white;
    }

    nav {
        display: none;
    }

    .section-header {
        color: #333;
    }

    .exp-bullets li {
        color: #333;
    }

    .exp-bullets li::before {
        color: #333;
    }

    .tech-tag {
        background: #f5f5f5;
        border-color: #ddd;
        color: #333;
    }
}