/* ===== Arpit Kafle — link hub (arpitkafle.me) ===== */
/* Matte-black dark theme on the DESIGN.md token system: dark canvas,
   light ink, subtle blue glow, dark hairline cards, Inter + JetBrains Mono. */

:root {
  /* colors — matte black dark theme */
  --primary: #ffffff;
  --primary-active: #e6e6e6;
  --text-link: #6db3f2;
  --ink: #f5f5f7;
  --body: #a8adb5;
  --muted: #6e7178;
  --hairline: #1f1f22;
  --hairline-soft: #1a1a1c;
  --hairline-strong: #2a2a2e;
  --canvas: #0b0b0d;
  --canvas-soft: #0f0f12;
  --surface-card: #141417;
  --surface-strong: #1c1c20;
  --surface-dark: #141417;
  --on-primary: #0b0b0d;
  --sky-light: #1b3a5c;
  --sky-mid: #14263a;

  /* radius */
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-pill: 9999px;

  /* spacing */
  --s-xxs: 4px; --s-xs: 8px; --s-sm: 12px; --s-base: 16px;
  --s-md: 20px; --s-lg: 24px; --s-xl: 32px; --s-xxl: 48px;

  --sans: "Inter", -apple-system, system-ui, sans-serif;
  --mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;

  --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.55);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--canvas);
  color: var(--body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--primary); color: var(--on-primary);
  padding: .5rem 1rem; border-radius: 0 0 var(--r-md) 0;
}
.skip-link:focus { left: 0; }

/* subtle blue glow behind the column (matte-black canvas) */
.sky-wash {
  position: fixed; inset: 0 0 auto 0; height: 520px; z-index: 0; pointer-events: none;
  background: radial-gradient(60% 70% at 50% -5%, rgba(60,120,200,.22) 0%, rgba(40,80,140,.10) 38%, rgba(11,11,13,0) 72%);
}

/* ===== Layout column ===== */
.tree {
  position: relative; z-index: 1;
  width: min(100% - 2.5rem, 540px);
  margin-inline: auto;
  padding: clamp(2.5rem, 7vw, 4.5rem) 0 var(--s-xxl);
}

/* ===== Profile header ===== */
.profile { text-align: center; }
.avatar {
  width: 120px; height: 120px; border-radius: var(--r-pill);
  object-fit: cover; border: 2px solid var(--hairline-strong);
  box-shadow: var(--shadow-card);
}
.name {
  font-size: clamp(1.8rem, 5vw, 2.25rem); font-weight: 700; line-height: 1.1;
  letter-spacing: -0.8px; color: var(--ink); margin: var(--s-base) 0 var(--s-xxs);
}
.handle { margin: 0 0 var(--s-sm); }
.handle a {
  color: var(--text-link); font-weight: 600; font-size: 15px;
}
.handle a:hover { text-decoration: underline; }
.bio {
  max-width: 30rem; margin: 0 auto var(--s-sm);
  color: var(--body); font-size: 15px;
}
.age-line {
  margin: 0; font-size: 13px; color: var(--muted);
}
.age {
  font-family: var(--mono); font-weight: 600; color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.age-meta { display: block; font-size: 12px; margin-top: 2px; }

/* ===== Link buttons ===== */
.links {
  display: flex; flex-direction: column; gap: var(--s-sm);
  margin-top: var(--s-xl);
}
.link-btn {
  position: relative;
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: center;
  gap: var(--s-sm);
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg);
  padding: 14px 18px;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.link-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  border-color: var(--ink);
  background: var(--surface-strong);
}
.link-btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.link-ic {
  width: 40px; height: 40px; display: grid; place-items: center;
  background: var(--surface-strong); color: var(--ink);
  border-radius: var(--r-md);
}
.link-ic .bx { font-size: 22px; line-height: 1; }
.link-btn:hover .link-ic { color: var(--text-link); }
.link-label { font-weight: 600; color: var(--ink); font-size: 15px; }
.link-sub { color: var(--muted); font-size: 12px; font-family: var(--mono); }

/* ===== About + FAQ (AEO content) ===== */
.about, .faq { margin-top: var(--s-xxl); }
.about-h {
  font-size: 13px; font-weight: 600; letter-spacing: .88px; text-transform: uppercase;
  color: var(--muted); margin: 0 0 var(--s-sm);
}
.about p { margin: 0; color: var(--body); font-size: 15px; line-height: 1.65; }
.about strong { color: var(--ink); font-weight: 600; }

.faq details {
  border: 1px solid var(--hairline-strong); border-radius: var(--r-md);
  padding: 12px 16px; margin-bottom: var(--s-xs); background: var(--surface-card);
}
.faq summary {
  cursor: pointer; font-weight: 600; color: var(--ink); font-size: 15px;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--muted); font-weight: 400; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: var(--s-xs) 0 0; font-size: 14px; line-height: 1.6; }

/* ===== Footer ===== */
.tree-foot {
  margin-top: var(--s-xxl); text-align: center;
  color: var(--muted); font-size: 12px;
}

/* ===== Reveal animation ===== */
.reveal-init { opacity: 0; transform: translateY(12px); }
.reveal-in {
  opacity: 1; transform: none;
  transition: opacity .5s ease, transform .5s ease;
}
@media (prefers-reduced-motion: reduce) {
  .reveal-init { opacity: 1; transform: none; }
  .link-btn:hover { transform: none; }
  html { scroll-behavior: auto; }
}