/* =========================================
   DEVIN ZHAO - PORTFOLIO STYLES
   ========================================= */

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --bg-card-hover: #22222e;
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.3);
    --accent-dark: #2563eb;
    --border: #2a2a3a;
    --gradient-1: #3b82f6;
    --gradient-2: #8b5cf6;
    --gradient-3: #06b6d4;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 24px 80px;
    max-width: 1100px;
    margin: 0 auto;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.hero-badge {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    padding: 6px 14px;
    border-radius: 20px;
    margin-bottom: 24px;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2), var(--gradient-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-1px);
    box-shadow: 0 0 30px var(--accent-glow);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
}

.hero-meta {
    display: flex;
    gap: 24px;
    font-size: 14px;
    color: var(--text-muted);
}

.hero-location, .hero-status {
    display: flex;
    align-items: center;
    gap: 6px;
}

.hero-status {
    color: #22c55e;
}

.hero-decoration {
    flex: 0 0 420px;
}

.code-block {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-dot.red { background: #ff5f57; }
.code-dot.yellow { background: #febc2e; }
.code-dot.green { background: #28c840; }

.code-filename {
    margin-left: 8px;
    font-size: 12px;
    color: var(--text-muted);
}

.code-content {
    padding: 20px;
    line-height: 1.8;
    overflow-x: auto;
}

.code-comment { color: #6b7280; }
.code-keyword { color: #c084fc; }
.code-type { color: #60a5fa; }
.code-string { color: #34d399; }

/* Section Base */
.section {
    padding: 100px 0;
}

.section-dark {
    background: var(--bg-secondary);
}

.section-header {
    margin-bottom: 48px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
}

.section-line {
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, var(--gradient-1), var(--gradient-2));
    border-radius: 2px;
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 48px;
    align-items: start;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 16px;
}

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

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: all 0.2s;
}

.stat-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.2s;
}

.skill-category:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.skill-icon {
    font-size: 28px;
    margin-bottom: 12px;
}

.skill-category-title {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
}

.skill-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 11px;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(180deg, var(--gradient-1), var(--gradient-2));
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -32px;
    top: 8px;
    width: 16px;
    height: 16px;
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    border-radius: 50%;
    z-index: 1;
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.2s;
}

.timeline-content:hover {
    border-color: var(--accent);
}

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

.timeline-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
}

.timeline-company {
    font-size: 14px;
    color: var(--accent);
    font-weight: 500;
}

.timeline-period {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
    display: block;
}

.timeline-achievements {
    list-style: none;
    margin-bottom: 16px;
}

.timeline-achievements li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
    line-height: 1.5;
}

.timeline-achievements li::before {
    content: '•';
    position: absolute;
    left: 6px;
    color: var(--accent);
}

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

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline-tags span {
    font-size: 12px;
    color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    padding: 4px 10px;
    border-radius: 12px;
}

/* Education */
.education-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.education-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    display: flex;
    gap: 20px;
    transition: all 0.2s;
}

.education-card:hover {
    border-color: var(--accent);
}

.education-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.education-degree {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.education-school {
    font-size: 14px;
    color: var(--accent);
    margin-bottom: 4px;
}

.education-years {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

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

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.project-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.project-badge {
    font-size: 11px;
    color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    padding: 3px 8px;
    border-radius: 10px;
    white-space: nowrap;
    margin-left: 8px;
}

.project-description {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 16px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.project-tech span {
    font-size: 11px;
    color: var(--text-muted);
    background: var(--bg-secondary);
    padding: 3px 8px;
    border-radius: 6px;
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-intro {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 28px;
    line-height: 1.7;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.2s;
}

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

.contact-link-icon {
    font-size: 20px;
}

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 14px;
    color: var(--text-primary);
    font-family: inherit;
    transition: border-color 0.2s;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.btn-full {
    width: 100%;
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: 40px 0;
    text-align: center;
}

.footer p {
    font-size: 14px;
    color: var(--text-muted);
}

.footer-meta {
    font-size: 12px !important;
    margin-top: 8px;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 900px) {
    .hero {
        flex-direction: column;
        padding-top: 100px;
    }
    
    .hero-decoration {
        display: none;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        flex-direction: row;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none;
    }
}

@media (max-width: 600px) {
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}