/* ============================================
   Matt Williams — Personal Site
   ============================================ */

:root {
    --bg-primary: #0f1724;
    --bg-secondary: #151e2e;
    --bg-card: #1a2438;
    --bg-card-hover: #1f2d45;
    --text-primary: #e8edf5;
    --text-secondary: #8a95a8;
    --text-muted: #5a6577;
    --accent: #38bdf8;
    --accent-dim: rgba(56, 189, 248, 0.1);
    --accent-glow: rgba(56, 189, 248, 0.15);
    --border: rgba(255, 255, 255, 0.06);
    --gradient-accent: linear-gradient(135deg, #38bdf8, #818cf8);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --nav-height: 70px;
    --max-width: 1100px;
    --transition: 0.3s ease;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: #7dd3fc; }
img { max-width: 100%; display: block; }

/* Container */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-height);
    background: rgba(15, 23, 36, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: background var(--transition);
}
.nav.scrolled { background: rgba(15, 23, 36, 0.95); }
.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}
.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--text-primary); }
.accent { color: var(--accent); }
.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}
.nav-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 2px;
    background: var(--accent);
    transition: width var(--transition);
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    width: 24px; height: 2px;
    background: var(--text-secondary);
    transition: all var(--transition);
}

/* ============================================
   Hero
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(56, 189, 248, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(129, 140, 248, 0.04) 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 1; padding-top: var(--nav-height); }
.hero-greeting {
    font-family: var(--font-mono);
    color: var(--accent);
    font-size: 1rem;
    margin-bottom: 12px;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 0.2s;
}
.hero-name {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 8px;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 0.4s;
}
.hero-title {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 20px;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 0.6s;
}
.hero-tagline {
    max-width: 560px;
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 36px;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 0.8s;
}
.hero-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 1s;
}
.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s ease infinite;
}
.scroll-indicator a { color: var(--text-muted); font-size: 1.2rem; }

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
    border: 1px solid transparent;
    cursor: pointer;
}
.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
}
.btn-primary:hover {
    background: #7dd3fc;
    color: var(--bg-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.25);
}
.btn-outline {
    border-color: var(--border);
    color: var(--text-secondary);
    background: transparent;
}
.btn-outline:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    transform: translateY(-1px);
}

/* ============================================
   Sections
   ============================================ */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-secondary); }
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 48px;
    letter-spacing: -0.02em;
}
.section-title::after {
    content: '';
    display: block;
    width: 48px; height: 3px;
    background: var(--gradient-accent);
    margin-top: 12px;
    border-radius: 2px;
}

/* ============================================
   About
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 48px;
    align-items: start;
}
.about-text p { margin-bottom: 16px; color: var(--text-secondary); }
.about-lead { font-size: 1.15rem; color: var(--text-primary) !important; font-weight: 500; }
.about-cards { display: flex; flex-direction: column; gap: 16px; }
.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px 24px;
    transition: all var(--transition);
}
.about-card:hover {
    border-color: rgba(56, 189, 248, 0.2);
    background: var(--bg-card-hover);
    transform: translateX(4px);
}
.about-card i {
    color: var(--accent);
    font-size: 1.25rem;
    margin-bottom: 8px;
}
.about-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.about-card p { color: var(--text-secondary); font-size: 0.875rem; margin: 0; }

/* ============================================
   Timeline / Career
   ============================================ */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
    content: '';
    position: absolute;
    left: 7px; top: 8px; bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--border));
}
.timeline-item {
    position: relative;
    margin-bottom: 40px;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-marker {
    position: absolute;
    left: -32px; top: 8px;
    width: 16px; height: 16px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    z-index: 1;
}
.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: all var(--transition);
}
.timeline-content:hover {
    border-color: rgba(56, 189, 248, 0.15);
}
.timeline-header { margin-bottom: 12px; }
.timeline-header h3 { font-size: 1.1rem; font-weight: 600; }
.timeline-company {
    display: inline-block;
    color: var(--accent);
    font-weight: 500;
    font-size: 0.9rem;
    margin-right: 12px;
}
.timeline-date {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-size: 0.8rem;
}
.timeline-content > p { color: var(--text-secondary); font-size: 0.95rem; }
.timeline-highlights {
    list-style: none;
    margin-top: 16px;
    display: grid;
    gap: 8px;
}
.timeline-highlights li {
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding-left: 20px;
    position: relative;
}
.timeline-highlights li::before {
    content: '▹';
    color: var(--accent);
    position: absolute;
    left: 0;
}

/* ============================================
   Skills
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: all var(--transition);
}
.skill-category:hover {
    border-color: rgba(56, 189, 248, 0.15);
}
.skill-category h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.skill-category h3 i { color: var(--accent); font-size: 0.9rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
    background: var(--accent-dim);
    color: var(--accent);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    font-family: var(--font-mono);
    border: 1px solid rgba(56, 189, 248, 0.1);
}

/* ============================================
   Projects
   ============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    transition: all var(--transition);
    display: block;
    color: var(--text-primary);
}
.project-card:hover {
    border-color: rgba(56, 189, 248, 0.2);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    color: var(--text-primary);
}
.project-card.featured { border-color: rgba(56, 189, 248, 0.15); }
.project-icon {
    width: 44px; height: 44px;
    border-radius: 10px;
    background: var(--accent-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}
.project-icon i { color: var(--accent); font-size: 1.1rem; }
.project-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.project-stars {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}
.project-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
    line-height: 1.6;
}
.project-tech { display: flex; gap: 8px; flex-wrap: wrap; }
.project-tech span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
    padding: 4px 10px;
    border-radius: 4px;
}

/* ============================================
   BJJ
   ============================================ */
.bjj-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}
.bjj-text h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 4px; }
.bjj-subtitle {
    color: var(--accent);
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 20px;
}
.bjj-text p { color: var(--text-secondary); margin-bottom: 16px; }
.bjj-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 24px 0;
}
.bjj-detail {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.bjj-detail i { color: var(--accent); width: 18px; text-align: center; }
.bjj-image-placeholder, .rocketry-image-placeholder {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    color: var(--text-muted);
    gap: 12px;
}
.bjj-image-placeholder i, .rocketry-image-placeholder i { font-size: 3rem; opacity: 0.3; }
.bjj-image-placeholder p, .rocketry-image-placeholder p { font-size: 0.875rem; }

/* ============================================
   Rocketry
   ============================================ */
.rocketry-content {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 48px;
    align-items: center;
}
.rocketry-text p { color: var(--text-secondary); margin-bottom: 16px; }

/* ============================================
   Testimonials
   ============================================ */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.testimonial-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    transition: all var(--transition);
}
.testimonial-card:hover { border-color: rgba(56, 189, 248, 0.15); }
.testimonial-quote i {
    color: var(--accent);
    font-size: 1.25rem;
    margin-bottom: 16px;
    display: block;
    opacity: 0.5;
}
.testimonial-quote p {
    color: var(--text-secondary);
    font-size: 0.925rem;
    font-style: italic;
    line-height: 1.7;
    margin-bottom: 20px;
}
.testimonial-author strong { display: block; color: var(--text-primary); font-size: 0.9rem; }
.testimonial-author span { color: var(--text-muted); font-size: 0.8rem; }

/* ============================================
   Contact
   ============================================ */
.contact-lead {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 36px;
    margin-top: -24px;
}
.contact-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 32px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: all var(--transition);
    color: var(--text-primary);
}
.contact-card:hover {
    border-color: rgba(56, 189, 248, 0.2);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    color: var(--text-primary);
}
.contact-card i { color: var(--accent); font-size: 1.25rem; }
.contact-card span { font-size: 0.95rem; font-weight: 500; }

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border);
    text-align: center;
}
.footer p { color: var(--text-muted); font-size: 0.85rem; }

/* ============================================
   Animations
   ============================================ */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-8px); }
    60% { transform: translateX(-50%) translateY(-4px); }
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: var(--nav-height); left: 0; right: 0;
        background: rgba(15, 23, 36, 0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition);
    }
    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    .nav-toggle { display: flex; }
    .about-grid { grid-template-columns: 1fr; }
    .bjj-content { grid-template-columns: 1fr; }
    .rocketry-content { grid-template-columns: 1fr; }
    .rocketry-image-placeholder { order: -1; }
    .bjj-details { grid-template-columns: 1fr; }
    .section { padding: 64px 0; }
    .contact-links { flex-direction: column; }
    .hero-name { font-size: clamp(2.5rem, 10vw, 4rem); }
}