/* ============================================
   Jason Hall - Personal Website
   A clean, professional design for Apache/Ubuntu
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Deep blue/teal professional palette */
    --color-primary: #0f172a;
    --color-secondary: #1e293b;
    --color-accent: #06b6d4;
    --color-accent-light: #22d3ee;
    --color-accent-subtle: rgba(6, 182, 212, 0.1);
    --color-text: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-text-dark: #1e293b;
    --color-border: rgba(148, 163, 184, 0.2);
    --color-surface: #1e293b;
    --color-surface-elevated: #334155;
    
    /* Typography */
    --font-display: 'DM Serif Display', Georgia, serif;
    --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(6, 182, 212, 0.15);
}

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

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

ul, ol {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
    margin-bottom: var(--space-md);
}

strong {
    font-weight: 600;
    color: var(--color-accent);
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-accent-light);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

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

.btn-text {
    background: none;
    color: var(--color-accent);
    padding: 0;
    font-weight: 500;
}

.btn-text:hover {
    color: var(--color-accent-light);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-lg) 0;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.nav.scrolled {
    padding: var(--space-md) 0;
    border-bottom-color: var(--color-border);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-text);
    letter-spacing: 0.05em;
}

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

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    font-weight: 400;
    position: relative;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        flex-direction: column;
        background: var(--color-secondary);
        padding: var(--space-4xl) var(--space-xl);
        gap: var(--space-lg);
        transition: right var(--transition-base);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: var(--space-4xl) 0;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 70% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 30% 80%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    position: relative;
}

.hero-tagline {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--space-md);
}

.hero-title {
    margin-bottom: var(--space-lg);
}

.hero-title .highlight {
    color: var(--color-accent);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
    max-width: 520px;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image-container {
    position: relative;
    width: 320px;
}

.hero-image {
    width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: 8px;
    position: relative;
    z-index: 2;
}

.hero-image-accent {
    display: none;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.2); }
}

@media (max-width: 900px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-image-container {
        width: 240px;
        height: 240px;
    }
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--space-4xl) 0;
    position: relative;
}

.section-header {
    margin-bottom: var(--space-3xl);
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-accent);
    display: block;
    margin-bottom: var(--space-sm);
}

.section-title {
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--color-accent);
}

/* ============================================
   About Section
   ============================================ */
.about {
    background: var(--color-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-4xl);
}

.about-text {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
}

.about-text p {
    margin-bottom: var(--space-lg);
}

.fun-fact {
    background: var(--color-accent-subtle);
    border-left: 3px solid var(--color-accent);
    padding: var(--space-lg);
    margin-bottom: var(--space-xl);
    border-radius: 0 8px 8px 0;
}

.fun-fact-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: var(--space-sm);
}

.fun-fact p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--color-text);
}

.about-skills h3 {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.skills-grid {
    display: grid;
    gap: var(--space-md);
}

.skill-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-surface-elevated);
    border-radius: 6px;
    transition: transform var(--transition-fast);
}

.skill-item:hover {
    transform: translateX(4px);
}

.skill-icon {
    font-size: 1.25rem;
}

.skill-name {
    font-size: 0.9375rem;
    color: var(--color-text);
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
}

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

.project-card {
    background: var(--color-surface);
    border-radius: 8px;
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.project-card-featured {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
}

@media (max-width: 900px) {
    .project-card-featured {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }
}

.project-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.project-card-featured .project-image {
    height: 100%;
    min-height: 280px;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.8), transparent);
}

.project-content {
    padding: var(--space-xl);
}

.project-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-title {
    margin: var(--space-sm) 0 var(--space-md);
    color: var(--color-text);
}

.project-description {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: var(--space-lg);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.project-tags span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    border-radius: 4px;
}

/* ============================================
   Achievements / Timeline
   ============================================ */
.achievements {
    background: var(--color-secondary);
}

.timeline {
    position: relative;
    max-width: var(--container-narrow);
}

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

.timeline-item {
    position: relative;
    padding-left: var(--space-2xl);
    padding-bottom: var(--space-2xl);
}

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

.timeline-marker {
    position: absolute;
    left: -5px;
    top: 0;
    width: 12px;
    height: 12px;
    background: var(--color-accent);
    border-radius: 50%;
    border: 3px solid var(--color-secondary);
}

.timeline-content {
    background: var(--color-surface);
    padding: var(--space-xl);
    border-radius: 8px;
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timeline-content h3 {
    margin: var(--space-sm) 0 var(--space-md);
    color: var(--color-text);
}

.timeline-content p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: var(--space-md);
}

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

/* ============================================
   Hobbies Section
   ============================================ */
.hobbies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.hobby-card {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-base);
}

.hobby-card:hover {
    transform: translateY(-4px);
}

.hobby-image {
    height: 200px;
    overflow: hidden;
}

.hobby-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.hobby-card:hover .hobby-image img {
    transform: scale(1.1);
}

.hobby-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    background: linear-gradient(to top, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.7), transparent);
}

.hobby-content h3 {
    color: var(--color-text);
    margin-bottom: var(--space-xs);
    font-size: 1.25rem;
}

.hobby-content p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin: 0;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    background: var(--color-secondary);
}

.contact-content {
    max-width: 600px;
}

.contact-intro {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-2xl);
}

.contact-links {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-xl);
    background: var(--color-surface);
    border-radius: 8px;
    color: var(--color-text);
    transition: all var(--transition-base);
}

.contact-link:hover {
    background: var(--color-surface-elevated);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.contact-link svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--space-2xl) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
}

.footer-credit {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    opacity: 0.7;
}

/* ============================================
   Modals
   ============================================ */
.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

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

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--color-surface);
    padding: var(--space-2xl);
    border-radius: 12px;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    transform: translateY(20px);
    transition: transform var(--transition-base);
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-content h2 {
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.modal-content h4 {
    margin: var(--space-xl) 0 var(--space-md);
    color: var(--color-accent);
    font-family: var(--font-body);
    font-weight: 600;
}

.modal-content p {
    color: var(--color-text-muted);
}

.modal-content ul {
    margin-bottom: var(--space-lg);
}

.modal-content li {
    color: var(--color-text-muted);
    padding-left: var(--space-lg);
    position: relative;
    margin-bottom: var(--space-sm);
}

.modal-content li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

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

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

/* Staggered animations for grids */
.projects-grid .project-card,
.hobbies-grid .hobby-card,
.skills-grid .skill-item {
    opacity: 0;
}

.projects-grid .project-card.visible,
.hobbies-grid .hobby-card.visible,
.skills-grid .skill-item.visible {
    animation: fadeInUp 0.5s ease forwards;
}

/* ============================================
   Utility Classes
   ============================================ */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}