/* ==========================================================================
   Arpit Karna — portfolio
   1. Tokens  2. Base  3. Nav  4. Hero  5. Sections  6. Case studies
   7. More work  8. Skills  9. About / Timeline  10. Contact  11. Footer
   12. Motion system  13. Responsive  14. Reduced motion
   ========================================================================== */

/* 1. TOKENS ------------------------------------------------------------- */
:root {
  --bg: #0a0a0a;
  --bg-veil: rgba(10, 10, 10, 0.84);
  --surface: #111111;
  --surface-2: #161616;
  --border: #262626;
  --text: #f0ede6;
  --muted: #9a968d;          /* 6.9:1 on --bg */
  --accent: #e8d5a3;
  --accent-2: #c9a96e;
  --danger: #f08a8a;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'DM Mono', ui-monospace, monospace;

  --gutter: clamp(1.25rem, 5vw, 4rem);
  --section-y: clamp(5rem, 11vw, 9rem);
  --maxw: 1240px;

  /* motion language: one curve, three durations */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 0.25s;
  --t-med: 0.6s;
  --t-slow: 1s;
}

/* 2. BASE --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; }
ul { list-style: none; }
button { font: inherit; color: inherit; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.skip-link {
  position: fixed; left: 1rem; top: -4rem; z-index: 300;
  background: var(--accent); color: var(--bg);
  padding: 0.6rem 1rem; text-decoration: none; font-weight: 500;
  transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: 1rem; }
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

main, footer, header { position: relative; z-index: 1; }

/* 3D stage (fixed, behind all content) */
#stage {
  position: fixed; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  opacity: var(--stage-o, 1);
}
.stage-fallback {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 55% 50% at 72% 42%, rgba(201,169,110,0.16) 0%, transparent 70%),
    radial-gradient(ellipse 80% 60% at 60% 40%, #1a1408 0%, var(--bg) 70%);
  display: none;
}
.stage-fallback svg { position: absolute; right: 10%; top: 22%; width: min(34vw, 420px); opacity: 0.85; }
html.no-webgl .stage-fallback { display: block; }
html.no-webgl #stage { display: none; }

/* shared type + labels */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); display: block; margin-bottom: 1rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.4vw, 3.6rem);
  font-weight: 700; line-height: 1.08; letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
}
.lede { color: var(--muted); max-width: 56ch; font-size: 1.02rem; }
.wrap { max-width: var(--maxw); margin: 0 auto; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: 0.78rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase;
  text-decoration: none; padding: 0.95rem 1.7rem; border-radius: 2px;
  border: 1px solid transparent; cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast), transform var(--t-fast) var(--ease);
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { background: var(--accent-2); }
.btn-ghost { border-color: var(--border); color: var(--text); background: rgba(10,10,10,0.4); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn .arrow { transition: transform var(--t-fast) var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* 3. NAV ---------------------------------------------------------------- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem var(--gutter);
  background: linear-gradient(to bottom, rgba(10,10,10,0.88), rgba(10,10,10,0));
  transition: background var(--t-fast), border-color var(--t-fast);
  border-bottom: 1px solid transparent;
}
.site-nav.scrolled { background: var(--bg-veil); border-bottom-color: var(--border); backdrop-filter: blur(10px); }
.nav-logo {
  font-family: var(--font-display); font-weight: 700; letter-spacing: 0.04em;
  text-decoration: none; font-size: 1.05rem;
}
.nav-links { display: flex; gap: 2.2rem; }
.nav-links a {
  position: relative; font-size: 0.76rem; font-weight: 500; letter-spacing: 0.12em;
  text-transform: uppercase; text-decoration: none; color: var(--muted);
  padding: 0.4rem 0; transition: color var(--t-fast);
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform var(--t-med) var(--ease);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
.nav-cta { padding: 0.6rem 1.3rem; }
.nav-toggle {
  display: none; width: 44px; height: 44px; background: none; border: 1px solid var(--border);
  border-radius: 2px; cursor: pointer; position: relative;
}
.nav-toggle span, .nav-toggle span::before {
  position: absolute; left: 12px; width: 18px; height: 1.5px; background: var(--text);
  transition: transform var(--t-fast) var(--ease);
}
.nav-toggle span { top: 21px; }
.nav-toggle span::before { content: ''; left: 0; top: -6px; }
.nav-toggle[aria-expanded="true"] span { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(6px) rotate(-90deg); }

/* 4. HERO --------------------------------------------------------------- */
#hero {
  min-height: 100vh; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 7rem var(--gutter) clamp(3rem, 7vh, 5rem);
  position: relative;
}
.hero-grain {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
}
.hero-meta {
  position: absolute; top: 50%; right: var(--gutter); transform: translateY(-50%);
  display: flex; flex-direction: column; align-items: flex-end; gap: 0.3rem;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--muted);
}
.hero-meta strong { color: var(--accent); font-weight: 500; }
.hero-content { position: relative; max-width: var(--maxw); width: 100%; margin: 0 auto; }
.hero-name {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(3.6rem, 12.5vw, 11rem); line-height: 0.9; letter-spacing: -0.02em;
  color: #fff; margin: 0.4rem 0 0;
}
.hero-name .line { display: block; }
.hero-name .line-2 { color: transparent; -webkit-text-stroke: 1px rgba(240,237,230,0.55); }
.mask { display: block; overflow: hidden; padding-bottom: 0.08em; margin-bottom: -0.08em; }
.mask > span { display: block; }
.hero-lede {
  margin-top: 2.2rem; max-width: 46ch; font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  color: var(--text); font-weight: 300;
}
.hero-lede em { font-style: normal; color: var(--accent); }
.hero-tag { color: var(--muted); font-size: 0.95rem; margin-top: 0.6rem; }
.hero-actions { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }
.scroll-cue {
  position: absolute; right: var(--gutter); bottom: clamp(3rem, 7vh, 5rem);
  display: flex; align-items: center; gap: 0.8rem; text-decoration: none;
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--muted); transition: color var(--t-fast);
}
.scroll-cue:hover { color: var(--text); }
.scroll-cue i { display: block; width: 1px; height: 46px; background: var(--border); position: relative; overflow: hidden; }
.scroll-cue i::after {
  content: ''; position: absolute; left: 0; top: 0; width: 1px; height: 40%; background: var(--accent);
  animation: cue 2.4s var(--ease) infinite;
}
@keyframes cue { 0% { transform: translateY(-100%); } 100% { transform: translateY(260%); } }

/* 5. SECTIONS ----------------------------------------------------------- */
.section { padding: var(--section-y) var(--gutter); background: var(--bg-veil); position: relative; }
.section.alt { background: rgba(17,17,17,0.9); border-block: 1px solid var(--border); }
.section-head { margin-bottom: clamp(2.5rem, 6vw, 4.5rem); }

/* 6. CASE STUDIES ------------------------------------------------------- */
.case {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem); align-items: center;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0; border-top: 1px solid var(--border);
}
.case:nth-of-type(even) .case-body { order: 2; }
.case-num { font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent); letter-spacing: 0.14em; }
.case h3 {
  font-family: var(--font-display); font-weight: 700; line-height: 1.05;
  font-size: clamp(2rem, 4vw, 3.2rem); margin: 0.6rem 0 0.5rem;
}
.case-kicker { color: var(--muted); font-size: 1.02rem; max-width: 52ch; }
.facts { margin: 1.6rem 0; display: grid; gap: 1.1rem; }
.facts dt {
  font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 0.25rem;
}
.facts dd { color: var(--text); font-size: 0.93rem; line-height: 1.65; max-width: 58ch; }
.facts dd + dt { margin-top: 0; }
.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin: 1.2rem 0 0; }
.tags li {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.06em;
  color: var(--muted); border: 1px solid var(--border); padding: 0.28rem 0.65rem; border-radius: 2px;
  transition: color var(--t-fast), border-color var(--t-fast), transform var(--t-fast) var(--ease);
}
.tags li:hover { color: var(--accent); border-color: var(--accent-2); transform: translateY(-2px); }
.links { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.6rem; }
.note { font-size: 0.78rem; color: var(--muted); margin-top: 0.9rem; max-width: 56ch; }

/* typographic visual panel (3D tilt) */
.tilt { transform-style: preserve-3d; will-change: transform; }
.panel {
  position: relative; border: 1px solid var(--border); border-radius: 4px;
  background:
    radial-gradient(circle at var(--mx, 70%) var(--my, 20%), rgba(232,213,163,0.12), transparent 55%),
    linear-gradient(160deg, #141414, #0c0c0c);
  padding: clamp(1.5rem, 3vw, 2.5rem); min-height: 340px;
  display: flex; flex-direction: column; justify-content: space-between; gap: 1.5rem;
  transition: border-color var(--t-med) var(--ease);
  overflow: hidden;
}
.panel:hover { border-color: rgba(201,169,110,0.5); }
.panel-label { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); }
.panel-big {
  font-family: var(--font-display); font-weight: 700; color: var(--accent);
  font-size: clamp(2.6rem, 6vw, 4.6rem); line-height: 1;
}
.panel-sub { color: var(--muted); font-size: 0.85rem; max-width: 34ch; margin-top: 0.5rem; }
.panel.shot { padding: 0; min-height: 0; gap: 0; max-height: 560px; }
.panel.shot img { width: 100%; height: 520px; object-fit: cover; object-position: top; }
.panel.shot .panel-label { padding: 0.9rem 1.2rem; border-top: 1px solid var(--border); background: #0c0c0c; }
.readout { font-family: var(--font-mono); font-size: 0.74rem; width: 100%; border-collapse: collapse; }
.readout th, .readout td { text-align: left; padding: 0.45rem 0; border-top: 1px solid var(--border); color: var(--muted); font-weight: 400; }
.readout td:last-child, .readout th:last-child { text-align: right; color: var(--text); }
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.chip {
  font-family: var(--font-mono); font-size: 0.74rem; padding: 0.4rem 0.8rem;
  border: 1px solid var(--accent-2); color: var(--accent); border-radius: 100px;
}
.chip.dim { border-color: var(--border); color: var(--muted); }
.chip-arrow { color: var(--muted); }
.mods { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--border); border: 1px solid var(--border); }
.mods div { background: #0e0e0e; padding: 1rem; font-family: var(--font-mono); font-size: 0.74rem; color: var(--text); }
.mods div small { display: block; color: var(--muted); font-size: 0.64rem; margin-top: 0.2rem; }

/* 7. MORE WORK ---------------------------------------------------------- */
.rows { border-top: 1px solid var(--border); }
.row {
  display: grid; grid-template-columns: 3rem minmax(0, 1.2fr) minmax(0, 2fr) minmax(0, 1fr) auto;
  gap: 1.5rem; align-items: baseline; padding: 1.5rem 0.5rem; border-bottom: 1px solid var(--border);
  transition: background var(--t-fast), padding var(--t-med) var(--ease);
}
.row:hover { background: rgba(232,213,163,0.04); padding-left: 1.2rem; }
.row .n { font-family: var(--font-mono); font-size: 0.7rem; color: var(--accent); }
.row h3 { font-family: var(--font-display); font-size: 1.25rem; font-weight: 700; line-height: 1.2; }
.row p { color: var(--muted); font-size: 0.9rem; }
.row .stack { font-family: var(--font-mono); font-size: 0.68rem; color: var(--muted); letter-spacing: 0.04em; }
.row-link {
  font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; text-decoration: none;
  color: var(--accent); white-space: nowrap; border-bottom: 1px solid transparent; justify-self: end;
}
.row-link:hover { border-bottom-color: var(--accent); }
.badge { font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); border: 1px solid var(--border); padding: 0.2rem 0.55rem; border-radius: 2px; white-space: nowrap; justify-self: end; }

/* 8. SKILLS ------------------------------------------------------------- */
.skill-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); }
.skill-group { background: var(--surface); padding: 2rem; transition: background var(--t-med); position: relative; }
.skill-group:hover { background: var(--surface-2); }
.skill-group h3 { font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 1.1rem; }

/* 9. ABOUT / TIMELINE --------------------------------------------------- */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.about-grid p { color: var(--muted); font-size: 1.02rem; margin-bottom: 1.1rem; max-width: 56ch; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--border); border: 1px solid var(--border); }
.stat { background: var(--bg); padding: 1.8rem; }
.stat b { font-family: var(--font-display); font-size: 2.8rem; line-height: 1; color: var(--accent); display: block; margin-bottom: 0.4rem; font-weight: 700; }
.stat span { font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.stat-note { font-size: 0.74rem; color: var(--muted); margin-top: 0.9rem; }

.timeline { max-width: 820px; border-top: 1px solid var(--border); }
.tl-item { display: grid; grid-template-columns: 150px 1fr; gap: 2rem; padding: 1.8rem 0; border-bottom: 1px solid var(--border); }
.tl-year { font-family: var(--font-mono); font-size: 0.74rem; color: var(--muted); letter-spacing: 0.08em; padding-top: 0.3rem; }
.tl-item h3 { font-family: var(--font-display); font-size: 1.25rem; margin-bottom: 0.25rem; }
.tl-item span.org { font-size: 0.78rem; letter-spacing: 0.08em; color: var(--accent); text-transform: uppercase; }

/* 10. CONTACT ----------------------------------------------------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.contact-detail { display: grid; gap: 0.6rem; margin: 2rem 0; }
.contact-detail a { font-size: 1.1rem; text-decoration: none; width: fit-content; border-bottom: 1px solid transparent; transition: color var(--t-fast), border-color var(--t-fast); }
.contact-detail a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.form { display: grid; gap: 1.2rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field { display: grid; gap: 0.4rem; }
.field label { font-size: 0.7rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--muted); }
.field input, .field select, .field textarea {
  width: 100%; background: var(--bg); border: 1px solid var(--border); color: var(--text);
  font-family: var(--font-body); font-size: 0.95rem; padding: 0.85rem 1rem; border-radius: 2px;
  transition: border-color var(--t-fast);
}
.field textarea { min-height: 130px; resize: vertical; }
.field input:focus-visible, .field select:focus-visible, .field textarea:focus-visible { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(232,213,163,0.18); }
.field [aria-invalid="true"] { border-color: var(--danger); }
.field-error { color: var(--danger); font-size: 0.78rem; min-height: 1.1em; }
.form-status { font-size: 0.9rem; min-height: 1.4em; }
.form-status.ok { color: var(--accent); }
.form-status.err { color: var(--danger); }
.btn[disabled] { opacity: 0.6; cursor: wait; }

/* 11. FOOTER ------------------------------------------------------------ */
.site-footer { background: var(--bg); border-top: 1px solid var(--border); padding: 3rem var(--gutter); }
.footer-top { display: flex; justify-content: space-between; align-items: center; gap: 2rem; flex-wrap: wrap; padding-bottom: 2rem; margin-bottom: 2rem; border-bottom: 1px solid var(--border); }
.footer-name { font-family: var(--font-display); font-size: 1.8rem; font-weight: 700; }
.footer-links { display: flex; gap: 1.8rem; flex-wrap: wrap; }
.footer-links a { font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); text-decoration: none; transition: color var(--t-fast); }
.footer-links a:hover { color: var(--text); }
.footer-bottom { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted); }

/* 12. MOTION SYSTEM ----------------------------------------------------- */
/* Content is only hidden when JS is running, so it never depends on JS to be readable. */
.js [data-reveal] {
  opacity: 0; transform: translateY(26px);
  transition: opacity var(--t-med) var(--ease), transform var(--t-med) var(--ease);
  transition-delay: var(--d, 0s);
}
.js [data-reveal].is-in { opacity: 1; transform: none; }
.js .mask > span { transform: translateY(110%); transition: transform var(--t-slow) var(--ease); transition-delay: var(--d, 0s); }
.js .is-ready .mask > span { transform: none; }
.js .hero-fade { opacity: 0; transform: translateY(16px); transition: opacity var(--t-med) var(--ease), transform var(--t-med) var(--ease); transition-delay: var(--d, 0s); }
.js .is-ready .hero-fade { opacity: 1; transform: none; }

/* 13. RESPONSIVE -------------------------------------------------------- */
@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-cta { display: none; }
  .nav-links {
    position: fixed; inset: 0 0 auto 0; top: 0; padding: 5.5rem var(--gutter) 2rem;
    flex-direction: column; gap: 0; background: rgba(10,10,10,0.97);
    border-bottom: 1px solid var(--border);
    transform: translateY(-110%); transition: transform var(--t-med) var(--ease); z-index: -1;
  }
  .nav-links.open { transform: none; }
  .nav-links a { display: block; font-size: 0.95rem; padding: 1rem 0; border-bottom: 1px solid var(--border); }
  .case { grid-template-columns: 1fr; }
  .case:nth-of-type(even) .case-body { order: 0; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .row { grid-template-columns: 2.2rem 1fr; gap: 0.4rem 1rem; }
  .row p, .row .stack, .row .row-link, .row .badge { grid-column: 2; justify-self: start; }
  .hero-meta, .scroll-cue { display: none; }
  #hero { justify-content: flex-end; padding-top: 38vh; }
}
@media (max-width: 560px) {
  .form-row { grid-template-columns: 1fr; }
  .tl-item { grid-template-columns: 1fr; gap: 0.3rem; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat b { font-size: 2.2rem; }
  .btn { padding: 0.95rem 1.3rem; }
  .footer-top, .footer-bottom { flex-direction: column; align-items: flex-start; }
}
@media (hover: none) { .tilt { transform: none !important; } }

/* 14. REDUCED MOTION ---------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; transition-delay: 0s !important; }
  .js [data-reveal], .js .hero-fade { opacity: 1; transform: none; }
  .js .mask > span { transform: none; }
  .tilt { transform: none !important; }
}