/* ==========================================================
   Obstinate Systems — shared styles
   ========================================================== */

@font-face {
  font-family: 'iA Writer Quattro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('https://cdn.jsdelivr.net/fontsource/fonts/ia-writer-quattro@latest/latin-400-normal.woff2') format('woff2');
}

/* --------------------------------------------------------
   Color — OKLCH, single hue family, system preference
-------------------------------------------------------- */
:root {
  color-scheme: dark light;

  /* Foundation — weathered basalt face */
  --bg: oklch(0.15 0.008 250);
  --surface: oklch(0.19 0.008 250);

  /* Text — mineral grays, faint cool undertone */
  --text: oklch(0.90 0.008 250);
  --text-dim: oklch(0.68 0.01 250);

  /* Accent — molten core */
  --copper: oklch(0.68 0.17 50);
  --copper-dim: oklch(0.30 0.06 45);

  /* Structure */
  --rule: oklch(0.26 0.008 250);
  --rule-faint: oklch(0.20 0.006 250);

  /* Grid echoes */
  --grid-fine: oklch(0.26 0.008 250 / 0.15);
  --grid-mid: oklch(0.28 0.008 250 / 0.10);
  --grid-coarse: oklch(0.30 0.008 250 / 0.07);

  /* Pattern bands */
  --band-1: oklch(0.38 0.02 250 / 0.40);
  --band-2: oklch(0.34 0.015 250 / 0.28);
  --band-3: oklch(0.30 0.01 250 / 0.18);

  /* Typewriter card */
  --card-bg: oklch(0.13 0.008 250);
  --card-rule: oklch(0.25 0.008 250);

  /* Graffiti 3D */
  --graffiti-shadow: oklch(0 0 0 / 0.7);

  /* Grain */
  --grain-opacity: 0.06;
}

/* --------------------------------------------------------
   Reset
-------------------------------------------------------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

/* --------------------------------------------------------
   Base
-------------------------------------------------------- */
body {
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse at 50% 40%, transparent 0%, transparent 40%, oklch(0 0 0 / 0.15) 100%);
  color: var(--text);
  font-family: 'Sora', system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

/* --------------------------------------------------------
   Grain — warehouse concrete texture
-------------------------------------------------------- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  filter: url(#noise);
  opacity: var(--grain-opacity);
  mix-blend-mode: overlay;
}

/* --------------------------------------------------------
   Layout
-------------------------------------------------------- */
.page {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100dvh;
  isolation: isolate;
}

.frame {
  max-width: 72rem;
  margin: 0 auto;
  width: 100%;
  padding-inline: clamp(1.5rem, 5vw, 4rem);
}

main, .footer {
  padding-inline: 1em;
}

/* --------------------------------------------------------
   Banner
-------------------------------------------------------- */
.banner {
  background-color: var(--surface);
  background-image:
    repeating-linear-gradient(53deg, transparent 0 23px, var(--grid-fine) 23px 24px),
    repeating-linear-gradient(-53deg, transparent 0 23px, var(--grid-fine) 23px 24px);
  border-bottom: 1px solid var(--rule);
}

.banner-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem clamp(1rem, 3vw, 2rem);
  padding-block: clamp(0.7rem, 2vw, 1rem);
}

.wordmark {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2.5rem);
}

.nav-link {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 400;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--copper);
}

/* --------------------------------------------------------
   Divider — filigree rule
-------------------------------------------------------- */
.divider {
  display: flex;
  align-items: center;
  gap: 0;
  padding: clamp(0.8rem, 2vw, 1.5rem) 0;
  max-width: 72rem;
  margin: 0 auto;
  width: 100%;
  padding-inline: clamp(1.5rem, 5vw, 4rem);
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.divider::before {
  mask-image: linear-gradient(to right, transparent, white 15%);
  -webkit-mask-image: linear-gradient(to right, transparent, white 15%);
}

.divider::after {
  mask-image: linear-gradient(to left, transparent, white 15%);
  -webkit-mask-image: linear-gradient(to left, transparent, white 15%);
}

.divider-ornament {
  padding: 0 1.2em;
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  color: var(--copper-dim);
  white-space: nowrap;
}

/* --------------------------------------------------------
   Page header — interior pages
-------------------------------------------------------- */
.page-header {
  padding: clamp(2rem, 5vw, 4rem) 0 clamp(1rem, 2vw, 1.5rem);
}

.page-title {
  font-family: 'Sora', sans-serif;
  font-weight: 300;
  font-size: clamp(2.5rem, 8vw, 6rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  text-transform: lowercase;
}

/* --------------------------------------------------------
   Section label — reusable uppercase marker
-------------------------------------------------------- */
.section-label {
  font-family: 'Sora', sans-serif;
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 2.5rem;
}

/* --------------------------------------------------------
   Prose — general body text
-------------------------------------------------------- */
.prose {
  max-width: 40em;
}

.prose p {
  font-size: clamp(1rem, 1.8vw, 1.12rem);
  line-height: 1.75;
  color: var(--text-dim);
}

.prose p + p {
  margin-top: 1.5em;
}

.prose p:first-child {
  color: var(--text);
}

.prose a {
  color: var(--copper);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color 0.2s ease;
}

.prose a:hover {
  color: var(--text);
}

/* --------------------------------------------------------
   Footer — mirrors the banner, closes the space
-------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--rule);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: start;
  flex-wrap: wrap;
  gap: 1.5rem clamp(2rem, 5vw, 4rem);
  padding-top: clamp(2.5rem, 6vw, 4rem);
  padding-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.footer-brand {
  display: grid;
  gap: 0.6rem;
}

.footer-tagline {
  font-family: 'iA Writer Quattro', 'Courier New', monospace;
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

.footer-nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2.5rem);
}

.footer-base {
  border-top: 1px solid var(--rule);
  padding: 1.2rem 0 clamp(2rem, 4vw, 3rem);
}

.footer-copyright {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------
   Light — whitewashed wall, ink on parchment
-------------------------------------------------------- */
@media (prefers-color-scheme: light) {
  :root {
    --bg: oklch(0.96 0.006 70);
    --surface: oklch(0.93 0.01 65);
    --text: oklch(0.18 0.01 250);
    --text-dim: oklch(0.45 0.01 250);
    --copper: oklch(0.62 0.17 50);
    --copper-dim: oklch(0.94 0.04 55);
    --rule: oklch(0.82 0.008 65);
    --rule-faint: oklch(0.88 0.006 70);
    --grid-fine: oklch(0.82 0.008 65 / 0.18);
    --grid-mid: oklch(0.76 0.01 60 / 0.12);
    --grid-coarse: oklch(0.70 0.012 55 / 0.08);
    --band-1: oklch(0.65 0.02 50 / 0.30);
    --band-2: oklch(0.70 0.015 55 / 0.22);
    --band-3: oklch(0.75 0.01 60 / 0.14);
    --card-bg: oklch(0.90 0.012 60);
    --card-rule: oklch(0.86 0.008 65);
    --graffiti-shadow: oklch(0 0 0 / 0.55);
    --grain-opacity: 0.03;
  }
}

/* --------------------------------------------------------
   Tablet+ — center content
-------------------------------------------------------- */
@media (min-width: 768px) {
  .page-header {
    text-align: center;
  }

  .page-title {
    text-align: center;
  }

  .section-label {
    text-align: center;
  }

  .prose {
    margin-inline: auto;
  }

  .product {
    text-align: center;
  }

  .product-description {
    margin-inline: auto;
    text-align: left;
  }

  .product-logo {
    margin-inline: auto;
  }

  .post-item {
    margin-inline: auto;
  }

  .post-excerpt {
    margin-inline: auto;
  }

  .contact-section {
    text-align: center;
  }

  .contact-grid {
    text-align: left;
  }

  .forge {
    text-align: center;
  }

  .footer-grid {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer-nav {
    justify-content: center;
  }

  .footer-base {
    text-align: center;
  }
}

/* --------------------------------------------------------
   Animation
-------------------------------------------------------- */
@keyframes reveal {
  from { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0s !important;
    animation-delay: 0s !important;
  }
}