/* 
Apple-inspired minimal styling
- System font stack for an Apple-adjacent feel
- Plenty of whitespace, crisp type, subtle motion
- Variables for easy theming
*/

/* light mode (default) */
:root {
  --bg: #fff;
  --bg-elev: #f6f7f8;
  --text: #0a0a0a;
  --muted: #6b7280;
  --line: rgb(0 0 0 / 8%);
  --accent: #3b82f6; /* blue tint for light */
  --btn-primary-text: #fff;
}

/* dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --bg-elev: #1a1a1a;
    --text: #f5f5f5;
    --muted: #9ca3af;
    --line: rgb(255 255 255 / 10%);
    --accent: #caa66a; /* gold tint for dark */
    --btn-primary-text: #000;
  }
}

html {
  background: var(--bg);
  color: var(--text);
  scroll-behavior: smooth;
}

:root {  
  /* type scale */
  --font-sans: -apple-system, blinkmacsystemfont, "Segoe UI", roboto, inter, helvetica, arial, "Apple Color Emoji", "Segoe UI Emoji";
  --size-xs: 0.875rem;
  --size-sm: 1rem;
  --size-md: 1.125rem;
  --size-lg: 1.5rem;
  --size-xl: clamp(2rem, 5vw, 3rem);
  --size-2xl: clamp(2.5rem, 7vw, 4rem);
  
  /* layout */
  --container: min(1200px, 92vw);
  --radius: 16px;
  --shadow-soft: 0 10px 30px rgb(0 0 0 / 6%);
  
  /* motion */
  --ease: cubic-bezier(.2,.8,.2,1);
  --duration: 600ms;
}

*,
*::before,
*::after { 
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: var(--size-sm);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* utils */
.container { 
  width: var(--container);
  margin-inline: auto;
}

.section { 
  padding: 96px 0;
}

.section-title {
  font-size: var(--size-xl);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}

.lead {
  font-size: var(--size-md);
  color: var(--muted);
  margin: 0 0 24px;
}

.split { 
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr 1fr;
}

.checklist { 
  margin: 0;
  padding: 0 0 0 1.1em;
}

.checklist li { 
  margin: 0 0 10px; 
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
  
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff; padding: 8px 12px; border-radius: 8px;
}
.skip-link:focus { left: 12px; z-index: 9999; }

/* header */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  font-weight: 600; 
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--text); 
  font-size: 1.1rem;
}

/* mobile device navigation */
.menu-toggle {
  display: none; background: transparent; border: 0; padding: 10px; border-radius: 10px;
}

.menu-icon, .menu-icon::before, .menu-icon::after {
  width: 22px; height: 2px; background: var(--text); display: block; position: relative; transition: transform 300ms var(--ease);
}
.menu-icon::before, .menu-icon::after { content: ""; position: absolute; left: 0; }
.menu-icon::before { top: -6px; }
.menu-icon::after { top: 6px; }
.menu-toggle[aria-expanded="true"] .menu-icon { background: transparent; }
.menu-toggle[aria-expanded="true"] .menu-icon::before { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-icon::after { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
  display: none; 
  flex-direction: column; 
  gap: 10px; 
  padding: 14px 20px 24px;
  border-bottom: 1px solid var(--line); 
  background: var(--bg);
}
.mobile-nav a { color: var(--text); text-decoration: none; padding: 8px 0; }
.mobile-nav hr { border: 0; border-top: 1px solid var(--line); margin: 10px 0; }

.site-nav { 
  display: flex; 
  align-items: center; 
  gap: 24px; 
}

.site-nav ul { 
  display: flex; 
  list-style: none; 
  gap: 16px; 
  padding: 0; 
  margin: 0; 
}

.site-nav a {
  color: var(--text); text-decoration: none;
  padding: 6px 10px; border-radius: 8px; transition: background var(--duration) var(--ease), transform 200ms var(--ease);
}

.site-nav a:hover { 
  background: var(--bg-elev);
  transform: translateY(-1px); 
}

.site-nav .external a::after { 
  /* content: "↗";  */
  margin-left: 6px; 
  font-size: 0.85em; 
  color: var(--muted); 
}

/* hero */
.hero {
  position: relative;
  overflow: clip;

  /* Make hero always fill full viewport height */
  min-height: 100vh;
  
  /* Keep content centered vertically */
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0; /* remove extra padding since we center vertically */
}

.hero-inner {
  width: 100%;
  max-width: 900px;
  padding: 0 1rem;
}

.headline {
  font-size: var(--size-2xl); line-height: 1.05; letter-spacing: -0.03em;
  margin: 0 0 16px;
}

.subheadline {
  color: var(--muted); font-size: var(--size-md);
  margin: 0 0 28px; max-width: 800px; margin-inline: auto;
}
.hero .btn { margin-inline: auto; }

/* space out buttons */
.hero .btn + .btn {
  margin-left: 5px;
}

/* parallax background/soft radial gradient */
.hero-bg {
  position: absolute; inset: -20% -10% 0;
  background:
  radial-gradient(1200px 600px at 50% 20%, color-mix(in oklab, var(--accent) 18%, transparent), transparent 60%),
  radial-gradient(900px 500px at 70% 10%, color-mix(in oklab, var(--accent) 12%, transparent), transparent 60%);
  opacity: 0.25;
  transform: translateY(0);
  will-change: transform;
}

/* about section */
.about-top {
  display: grid;
  grid-template-columns: 240px 1.2fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 48px;
}

.about-intro {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.about-bottom {
  margin-top: 0;
  margin-bottom: 32px;
}

/* Mobile stacking */
@media (width <= 800px) {
  .about-top {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-intro {
    text-align: center;
  }

  .about-bottom {
    grid-template-columns: 1fr;
    gap: 24px;
    text-align: left;
  }

  .cta-row {
    justify-content: center;
  }
}

/* circular pfp */
.about-media img {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 160px;
  height: 160px;
  border-radius: 50%;
}

/* centered buttons */
.cta-row {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  justify-content: center;
}


/* projects section */
.projects .project-grid {
  display: grid; gap: 24px;
  grid-template-columns: repeat(12, 1fr);
}

.card {
  grid-column: span 4;
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft); overflow: hidden;
  transition: transform 300ms var(--ease), box-shadow 300ms var(--ease);
}

.card:hover { 
  transform: translateY(-6px);
  box-shadow: 0 14px 50px rgb(0 0 0 / 8%);
}

.card-media img { 
  display: block;
  width: 100%;
  height: 40%; 
  object-fit: cover;
}

.card-body { 
  padding: 18px 18px 16px;
}

.card-body h3 { 
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.card-body p { 
  margin: 0 0 12px;
  color: var(--muted); 
}

.card-actions { 
  display: flex;
  gap: 16px; 
}

.text-link { 
  color: var(--text); 
  text-decoration: none; 
  border-bottom: 1px solid var(--line); 
  padding-bottom: 2px; 
}

.text-link:hover { 
  border-color: var(--text);
}

/* button customization */
.btn {
  appearance: none; border: 1px solid var(--line); 
  background: var(--bg);
  padding: 12px 18px; 
  border-radius: 999px; 
  text-decoration: none; 
  color: var(--text);
  display: inline-flex; 
  align-items: center; 
  justify-content: center; 
  gap: 8px;
  transition: transform 220ms var(--ease), background 220ms var(--ease), border-color 220ms var(--ease), box-shadow 220ms var(--ease);
  will-change: transform;
}

.btn:hover { 
  transform: translateY(-2px); 
  background: var(--bg-elev); 
}

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

.btn.primary:hover {
  transform: translateY(-2px); background: color-mix(in oklab, var(--text) 94%, var(--accent) 6%);
  box-shadow: 0 8px 24px rgb(0 0 0 / 18%);
}

.btn.ghost {
  background: transparent;
}

/* outro */
.outro {
  align-items: center;
  text-align: center;
}

.outro-intro {
  color: var(--muted);
  font-size: 18px;
  margin: 0 auto 32px;
  max-width: 640px;
}

.outro h3 {
  font-size: 36px;
}

.outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 32px;
}


/* footer */
.site-footer { 
  border-top: 1px solid var(--line);
  padding: 36px 0; 
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer nav a { 
  color: var(--muted); 
  text-decoration: none; 
  margin-right: 16px; 
}

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

/* reveal on scroll */
.reveal {
  opacity: 0; transform: translateY(12px);
  transition: opacity var(--duration) var(--ease), transform var(--duration) var(--ease);
}

.revealed { 
  opacity: 1; 
  transform: none; 
}

/* responsive design */
@media (width <= 1024px) {
  .projects .project-grid .card { grid-column: span 6; }
  .split { grid-template-columns: 1fr; }
}

@media (width <= 800px) {
  .site-nav { display: none; }
  .menu-toggle { display: inline-block; }
  .mobile-nav[ data-open="true" ] { display: flex; }
  .about-grid { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
}

@media (width <= 600px) {
  .projects .project-grid .card { grid-column: span 12; }
  .headline { letter-spacing: -0.02em; }
}

/* reduced motion option */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { transition: none; }
  .btn, .card, .site-nav a { transition: none; }
  .hero-bg { will-change: auto; }
}