/* ==========================================================================
   Brian Garrett, Personal site
   Global design system: tokens, type, layout, components.
   Quiet intelligence: warm, editorial, precise.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Palette */
  --canvas: #F5F0E8;
  --paper: #FBF8F2;
  --ink: #11100F;
  --muted-ink: #5F5A54;
  --accent-rust: #C65A2E;
  --accent-rust-dark: #9F4322;
  --line: #D8CEC1;
  --soft-tan: #E9DED1;
  --night: #0D0D0D;
  --night-text: #F6F1E8;
  --night-muted: #A79E90;
  --night-line: #2A2825;

  /* Type families */
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: "Instrument Serif", Georgia, "Times New Roman", serif;

  /* Fluid type scale */
  --fs-display: clamp(2.75rem, 1.6rem + 5.6vw, 5.75rem);
  --fs-h1: clamp(2.25rem, 1.4rem + 3.6vw, 3.75rem);
  --fs-h2: clamp(1.75rem, 1.2rem + 2.4vw, 2.75rem);
  --fs-h3: clamp(1.25rem, 1rem + 1.1vw, 1.6rem);
  --fs-lead: clamp(1.05rem, 0.98rem + 0.4vw, 1.25rem);
  --fs-body: 1.0625rem;
  --fs-small: 0.9375rem;
  --fs-label: 0.75rem;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;
  --space-7: 9rem;

  /* Structure */
  --container: 1200px;
  --container-wide: 1360px;
  --radius: 6px;
  --radius-lg: 12px;
  --header-h: 76px;

  --transition: 240ms cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-soft: 0 18px 40px -24px rgba(17, 16, 15, 0.35);
  --shadow-lift: 0 26px 60px -28px rgba(17, 16, 15, 0.55);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--sans);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

:focus-visible {
  outline: 2.5px solid var(--accent-rust);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 { line-height: 1.08; font-weight: 600; letter-spacing: -0.02em; }
.serif { font-family: var(--serif); font-weight: 400; letter-spacing: -0.01em; }
p { max-width: 62ch; }

.eyebrow {
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent-rust);
}
.eyebrow--muted { color: var(--muted-ink); }

.lead {
  font-size: var(--fs-lead);
  color: var(--muted-ink);
  line-height: 1.6;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}
.container--wide { max-width: var(--container-wide); }

.section { padding-block: var(--space-6); }
.section--tight { padding-block: var(--space-5); }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--ink);
  color: var(--night-text);
  padding: 0.65rem 1rem;
  border-radius: var(--radius);
  z-index: 200;
  transition: top var(--transition);
}
.skip-link:focus { top: 1rem; }

/* ---------- Buttons & links ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  border: 1.5px solid transparent;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition);
}
.btn .arrow { transition: transform var(--transition); }
.btn:hover .arrow, .btn:focus-visible .arrow { transform: translateX(4px); }

.btn:active { transform: scale(0.98); }
.btn--primary { background: var(--accent-rust); color: var(--paper); }
.btn--primary:hover, .btn--primary:focus-visible { background: var(--accent-rust-dark); }

.btn--outline { border-color: var(--line); color: var(--ink); background: transparent; }
.btn--outline:hover, .btn--outline:focus-visible { border-color: var(--ink); background: rgba(17,16,15,0.04); }

.btn--on-dark { border-color: var(--night-line); color: var(--night-text); }
.btn--on-dark:hover, .btn--on-dark:focus-visible { border-color: var(--accent-rust); }

/* Circular arrow CTA (hero) */
.btn-circle {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--ink);
}
.btn-circle .disc {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 999px;
  background: var(--accent-rust);
  color: var(--paper);
  display: grid;
  place-items: center;
  transition: background var(--transition), transform var(--transition);
}
.btn-circle .disc svg { transition: transform var(--transition); }
.btn-circle:hover .disc, .btn-circle:focus-visible .disc { background: var(--accent-rust-dark); }
.btn-circle:hover .disc svg, .btn-circle:focus-visible .disc svg { transform: translateX(3px); }

/* Text link with arrow */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  font-size: var(--fs-small);
  color: var(--accent-rust);
  border-bottom: 1.5px solid transparent;
  padding-bottom: 2px;
  transition: border-color var(--transition);
}
.link-arrow .arrow { transition: transform var(--transition); }
.link-arrow:hover, .link-arrow:focus-visible { border-color: var(--accent-rust); }
.link-arrow:hover .arrow, .link-arrow:focus-visible .arrow { transform: translateX(4px); }
.link-arrow--ink { color: var(--ink); }
.link-arrow--ink:hover, .link-arrow--ink:focus-visible { border-color: var(--ink); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--line);
}
.site-header.on-dark { color: var(--night-text); }
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.wordmark {
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.nav { display: flex; align-items: center; gap: clamp(1.25rem, 2.4vw, 2.5rem); }
.nav a {
  position: relative;
  font-size: var(--fs-small);
  font-weight: 500;
  color: inherit;
  opacity: 0.85;
  transition: opacity var(--transition);
}
.nav a:hover { opacity: 1; }
.nav a[aria-current="page"] { opacity: 1; }
.nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--accent-rust);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.nav a:hover::after,
.nav a:focus-visible::after,
.nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav-toggle { display: none; }

/* Mobile nav */
@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px; height: 44px;
    border: none;
    background: transparent;
    color: inherit;
  }
  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem clamp(1.25rem, 5vw, 3rem) 1.5rem;
    box-shadow: var(--shadow-soft);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
  }
  .nav.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav a { width: 100%; padding: 0.9rem 0; font-size: 1.05rem; border-bottom: 1px solid var(--line); opacity: 1; color: var(--ink); }
  .nav a:last-child { border-bottom: none; }
  .nav a[aria-current="page"]::after { display: none; }
  .nav a[aria-current="page"] { color: var(--accent-rust); }
  .site-header.on-dark .nav-toggle { color: var(--night-text); }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--night);
  color: var(--night-text);
  padding-block: var(--space-5) var(--space-4);
}
.footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--night-line);
}
.footer-statement { font-family: var(--serif); font-size: clamp(1.6rem, 1.1rem + 2vw, 2.5rem); max-width: 16ch; line-height: 1.1; }
.footer-statement .rust { color: var(--accent-rust); }
.footer-cols { display: flex; flex-wrap: wrap; gap: var(--space-5); }
.footer-col h4 {
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--night-muted);
  margin-bottom: 1rem;
  font-weight: 600;
}
.footer-col ul { list-style: none; padding: 0; display: grid; gap: 0.7rem; }
.footer-col a { color: var(--night-text); opacity: 0.85; font-size: var(--fs-small); transition: color var(--transition), opacity var(--transition); }
.footer-col a:hover { color: var(--accent-rust); opacity: 1; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-3);
  font-size: var(--fs-small);
  color: var(--night-muted);
}

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 700ms ease, transform 700ms cubic-bezier(0.2, 0.7, 0.2, 1); }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none; }
}

/* ---------- Gentle page-load fade ---------- */
@media (prefers-reduced-motion: no-preference) {
  body { animation: pageFade 480ms ease both; }
  @keyframes pageFade { from { opacity: 0; } to { opacity: 1; } }
}

/* ---------- Collage / texture marks ---------- */
.paper-grain::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.045'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

/* Black-and-white editorial treatment for photography (never product UI/branding) */
.bw { filter: grayscale(1) contrast(1.03); }

/* Utility */
.rust { color: var(--accent-rust); }
.text-center { text-align: center; }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}