/* ============================================
   Joseph Ho Portfolio - Styles
   ============================================ */

:root {
    /* Dark Theme Colors */
    --bg-primary: #000000;
    --bg-secondary: #222222;
    --bg-tertiary: #333333;
    --bg-card: #444444;
    
    /* Accent Colors */
    --accent-primary: #00cdd4;
    --accent-secondary: #7c3aed;
    --accent-gradient: linear-gradient(135deg, #00cdd4 0%, #00c8c8 100%);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    
    /* Code Colors */
    --code-keyword: #c678dd;
    --code-string: #98c379;
    --code-number: #d19a66;
    --code-property: #e06c75;
    --code-comment: #5c6370;
    
    /* Other */
    --border-color: #2a2a3a;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

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

/* ============================================
   Hero Section
   ============================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
    gap: 4rem;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.greeting {
    color: var(--accent-primary);
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #fff, #a0a0b0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero h2 {
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.hero-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.8;
}

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

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.9rem 2rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #000;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 170, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: var(--accent-primary);
    transform: translateY(-3px);
}

/* Hero Visual - Code Block */
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.code-block {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    width: 100%;
    max-width: 450px;
    box-shadow: var(--shadow);
}

.code-header {
    display: flex;
    gap: 8px;
    margin-bottom: 1rem;
}

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

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.code-block pre {
    margin: 0;
    overflow-x: auto;
}

.code-block code {
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.keyword { color: var(--code-keyword); }
.variable { color: var(--code-property); }
.property { color: #e06c75; }
.string { color: var(--code-string); }

/* ============================================
   Section Styles
   ============================================ */

section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* Skills Section */
.skills-section {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    margin: 0 auto 2rem;
    max-width: 1200px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.skill-category h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.skill-tag:hover {
    border-color: var(--accent-primary);
}

.personal-development-section {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    margin: 0 auto 2rem;
    padding: 2.5rem;
}

.personal-development-section .section-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.running-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.activity-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.activity-card h3 {
    margin-bottom: 0.4rem;
    font-size: 1.1rem;
    color: var(--accent-primary);
}

.activity-card .activity-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.activity-stats {
    margin: 0.75rem 0;
}

.activity-stats p {
    margin: 0.25rem 0;
    font-size: 0.9rem;
}

.activity-map {
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.activity-link {
    display: inline-block;
    margin-top: 0.75rem;
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.activity-card--live {
    background: linear-gradient(135deg, rgba(0,205,212,0.12), rgba(0,184,184,0.09));
    border-color: rgba(0,205,212,0.4);
}

.latest-activity-shell h3 {
    margin-bottom: 0.75rem;
}

.refresh-note {
    margin-top: 0.75rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Certifications */
.certifications h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.cert-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.cert-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1.2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.cert-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    cursor: pointer;
}

.cert-badge.aws {
    background: #ff9900;
    color: #000;
    font-weight: 700;
    font-size: 0.75rem;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
}

.cert-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.cert-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Experience Timeline */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-bottom: 2.5rem;
}

.timeline-marker {
    position: absolute;
    left: -2.4rem;
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--accent-primary);
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
}

.timeline-content {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.timeline-content .date {
    color: var(--accent-primary);
    font-size: 0.85rem;
    font-weight: 500;
}

.timeline-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0.5rem 0 0.2rem;
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1rem;
}

.timeline-content ul {
    list-style: disc;
    padding-left: 1.2rem;
    color: var(--text-secondary);
}

.timeline-content ul li {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.8rem;
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 40px rgba(0, 212, 170, 0.1);
}

.project-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.project-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.project-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.2rem;
}

.project-tags span {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.3rem 0.7rem;
    border-radius: 4px;
}

.project-link {
    color: var(--accent-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.project-link:hover {
    text-decoration: underline;
}

/* Education Section */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.education-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.8rem;
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.edu-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.edu-year {
    color: var(--text-muted);
    font-size: 0.85rem;
    white-space: nowrap;
}

.education-card h4 {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.education-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.honours {
    margin-top: 0.8rem;
    padding-top: 0.8rem;
    border-top: 1px solid var(--border-color);
    font-style: italic;
}

/* Contact Section */
.contact-section {
    text-align: center;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    margin: 0 auto 2rem;
    max-width: 1200px;
}

.contact-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.contact-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-weight: 500;
    transition: all 0.3s ease;
}

.contact-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 968px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 6rem;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .social-links {
        justify-content: center;
    }

    .hero-visual {
        width: 100%;
    }

    .nav-links {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero h2 {
        font-size: 1.3rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    section {
        padding: 3rem 1rem;
    }

    .btn {
        padding: 0.8rem 1.5rem;
    }
}