/* ==========================================================================
   Vistacoat — Silica Matting Solutions for Coatings
   Design tokens
   ========================================================================== */

:root {
  /* Palette */
  --ink:         #1A1A1A;
  --ink-60:      #5C5C5C;
  --ink-40:      #8A8A8A;
  --deep:        #1B3A5C;   /* primary — industrial indigo */
  --deep-dark:   #12283F;
  --deep-tint:   #E6EBF0;
  --clay:        #C9622D;   /* accent — matte earth */
  --clay-dark:   #A54F22;
  --sand:        #EFEDE8;   /* surface */
  --sand-deep:   #E4E1DA;
  --white:       #FFFFFF;
  --line:        #D5D2CA;

  /* Type */
  --font-display: "Barlow Condensed", "Helvetica Neue", Arial, sans-serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --font-mono:    "IBM Plex Mono", "SF Mono", Menlo, monospace;

  /* Scale */
  --step--1: 0.8125rem;
  --step-0:  0.9375rem;
  --step-1:  1.0625rem;
  --step-2:  1.375rem;
  --step-3:  1.875rem;
  --step-4:  2.625rem;
  --step-5:  3.75rem;

  /* Layout */
  --wrap: 1240px;
  --gutter: 24px;
  --header-h: 96px;
}

/* ==========================================================================
   Reset
   ========================================================================== */

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { margin: 0; font-weight: 600; line-height: 1.15; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.25em; }
li { margin-bottom: 0.4em; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--deep); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--clay); }

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

.skip-link {
  position: absolute; left: -9999px;
  background: var(--deep); color: #fff;
  padding: 12px 20px; z-index: 999;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ==========================================================================
   Layout primitives
   ========================================================================== */

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: 80px; }
.section--tight { padding-block: 56px; }
.section--sand { background: var(--sand); }
.section--deep { background: var(--deep); color: #fff; }
.section--deep h2, .section--deep h3 { color: #fff; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clay);
  margin: 0 0 14px;
  display: block;
}
.section--deep .eyebrow { color: #E0A886; }

h2.section-title {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  margin: 0 0 20px;
}

.lede {
  font-size: var(--step-1);
  color: var(--ink-60);
  max-width: 62ch;
}
.section--deep .lede { color: #C3D0DC; }

/* ==========================================================================
   Header
   ========================================================================== */

.topbar {
  background: var(--deep-dark);
  color: #B9C7D4;
  font-size: var(--step--1);
}
.topbar__inner {
  display: flex; justify-content: flex-end; align-items: center;
  gap: 24px; min-height: 38px;
}
.topbar a { color: #B9C7D4; text-decoration: none; }
.topbar a:hover { color: #fff; }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex; align-items: center; gap: 32px;
  min-height: var(--header-h);
}

.logo { display: flex; align-items: baseline; gap: 2px; text-decoration: none; flex-shrink: 0; }
.logo__mark {
  font-family: var(--font-display);
  font-size: 1.9rem; font-weight: 700;
  letter-spacing: -0.02em; text-transform: uppercase;
  color: var(--deep);
}
.logo__mark em { font-style: normal; color: var(--clay); }
.logo__sub {
  font-family: var(--font-mono);
  font-size: 0.6rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-40);
  margin-left: 8px;
}

.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav__link {
  font-size: var(--step-0);
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
  padding: 10px 14px;
  border-bottom: 2px solid transparent;
}
.nav__link:hover, .nav__link[aria-current="page"] {
  color: var(--deep);
  border-bottom-color: var(--clay);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  background: var(--deep); color: #fff; border: 0;
  width: 46px; height: 46px; cursor: pointer;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block; width: 20px; height: 2px; background: #fff;
  position: relative;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 20px; height: 2px; background: #fff;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-weight: 600;
  padding: 14px 28px;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color .15s, color .15s, border-color .15s;
}
.btn--primary { background: var(--clay); color: #fff; border-color: var(--clay); }
.btn--primary:hover { background: var(--clay-dark); border-color: var(--clay-dark); color: #fff; }
.btn--deep { background: var(--deep); color: #fff; border-color: var(--deep); }
.btn--deep:hover { background: var(--deep-dark); color: #fff; }
.btn--ghost { background: transparent; color: var(--deep); border-color: var(--deep); }
.btn--ghost:hover { background: var(--deep); color: #fff; }
.btn--ghost-light { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.btn--ghost-light:hover { background: #fff; color: var(--deep); }

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  background: var(--deep);
  color: #fff;
  padding-block: 88px 0;
  overflow: hidden;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 56px;
  align-items: start;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--step-5);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: -0.015em;
  line-height: 1.02;
  margin-bottom: 24px;
}
.hero h1 em { font-style: normal; color: #E8A87C; display: block; }
.hero__lede { font-size: var(--step-1); color: #C3D0DC; max-width: 54ch; }

.hero__claim {
  font-family: var(--font-mono);
  font-size: var(--step-0);
  letter-spacing: 0.05em;
  color: #E8A87C;
  border-left: 3px solid var(--clay);
  padding-left: 16px;
  margin: 28px 0 0;
}

/* Signature: gloss scale */
.gloss-scale { margin-top: 64px; padding-bottom: 56px; }
.gloss-scale__label {
  display: flex; justify-content: space-between;
  font-family: var(--font-mono); font-size: var(--step--1);
  letter-spacing: 0.1em; text-transform: uppercase;
  color: #8FA3B5; margin-bottom: 10px;
}
.gloss-scale__track {
  height: 10px;
  background: linear-gradient(90deg, #F2F4F6 0%, #C7CFD6 28%, #7E8A95 58%, #3D4750 82%, #22282E 100%);
  position: relative;
}
.gloss-scale__ticks {
  display: grid; grid-template-columns: repeat(6, 1fr);
  margin-top: 0;
}
.gloss-tick {
  border-left: 1px solid rgba(255,255,255,.22);
  padding: 14px 12px 0 12px;
  text-decoration: none;
  display: block;
}
.gloss-tick:hover { background: rgba(255,255,255,.05); }
.gloss-tick__gu {
  font-family: var(--font-mono); font-size: var(--step--1);
  color: #E8A87C; display: block; margin-bottom: 4px;
}
.gloss-tick__name {
  font-size: var(--step-0); font-weight: 600; color: #fff;
  line-height: 1.3;
}

/* ==========================================================================
   Cards / grids
   ========================================================================== */

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.card {
  background: var(--sand);
  padding: 30px;
  text-decoration: none;
  color: var(--ink);
  display: block;
  border-top: 3px solid transparent;
  transition: background-color .15s, border-color .15s;
}
a.card:hover { background: var(--sand-deep); border-top-color: var(--clay); }
.card__gu {
  font-family: var(--font-mono); font-size: var(--step--1);
  letter-spacing: 0.08em; color: var(--clay); display: block; margin-bottom: 10px;
}
.card h3 {
  font-family: var(--font-display);
  font-size: var(--step-2);
  text-transform: uppercase;
  letter-spacing: -0.005em;
  margin-bottom: 10px;
  color: var(--deep);
}
.card p { font-size: var(--step-0); color: var(--ink-60); margin-bottom: 12px; }
.card__claim {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ink);
  border-top: 1px solid var(--line);
  padding-top: 12px;
  margin: 0;
}

/* Stat blocks */
.stat { padding: 24px 0; }
.stat__num {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  color: var(--clay);
  line-height: 1;
  display: block;
}
.section--deep .stat__num { color: #E8A87C; }
.stat__label {
  font-size: var(--step--1);
  color: var(--ink-60);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
  margin-top: 8px;
  display: block;
}
.section--deep .stat__label { color: #8FA3B5; }

/* ==========================================================================
   Tables
   ========================================================================== */

.table-scroll { overflow-x: auto; margin-bottom: 24px; }

table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--step-0);
  background: var(--white);
}
table.data caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-40);
  padding-bottom: 10px;
}
table.data th, table.data td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.data thead th {
  background: var(--deep);
  color: #fff;
  font-weight: 600;
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 0;
}
table.data tbody tr:nth-child(even) { background: var(--sand); }
table.data .grade {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--deep);
  white-space: nowrap;
}
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 8px;
  background: var(--deep-tint);
  color: var(--deep);
  white-space: nowrap;
}
.tag--lead { background: var(--clay); color: #fff; }

/* ==========================================================================
   Page header (interior pages)
   ========================================================================== */

.page-head {
  background: var(--deep);
  color: #fff;
  padding-block: 64px 56px;
}
.page-head h1 {
  font-family: var(--font-display);
  font-size: var(--step-5);
  text-transform: uppercase;
  letter-spacing: -0.015em;
  line-height: 1.03;
  margin-bottom: 18px;
  max-width: 20ch;
}
.page-head .lede { color: #C3D0DC; }

.crumbs {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  color: #8FA3B5;
  margin-bottom: 22px;
}
.crumbs a { color: #8FA3B5; text-decoration: none; }
.crumbs a:hover { color: #fff; }
.crumbs span { margin: 0 8px; }

/* Solution page gloss position indicator */
.gloss-position { margin-top: 32px; max-width: 640px; }
.gloss-position__track {
  height: 8px;
  background: linear-gradient(90deg, #F2F4F6 0%, #C7CFD6 28%, #7E8A95 58%, #3D4750 82%, #22282E 100%);
  position: relative;
}
.gloss-position__marker {
  position: absolute; top: -6px; bottom: -6px;
  border-left: 2px solid var(--clay);
  border-right: 2px solid var(--clay);
  background: rgba(201,98,45,.28);
}
.gloss-position__caption {
  font-family: var(--font-mono); font-size: var(--step--1);
  color: #8FA3B5; margin-top: 10px; letter-spacing: 0.05em;
}

/* ==========================================================================
   Content blocks
   ========================================================================== */

.prose h3 {
  font-family: var(--font-display);
  font-size: var(--step-3);
  text-transform: uppercase;
  color: var(--deep);
  margin: 44px 0 14px;
}
.prose h4 {
  font-size: var(--step-1);
  color: var(--deep);
  margin: 28px 0 10px;
}
.prose > *:first-child { margin-top: 0; }

.checklist { list-style: none; padding: 0; }
.checklist li {
  padding-left: 26px;
  position: relative;
  margin-bottom: 10px;
}
.checklist li::before {
  content: "";
  position: absolute; left: 0; top: 0.6em;
  width: 10px; height: 2px; background: var(--clay);
}

.callout {
  background: var(--sand);
  border-left: 3px solid var(--deep);
  padding: 24px 28px;
  margin: 32px 0;
}
.callout p:last-child { margin-bottom: 0; }
.callout__label {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--clay);
  display: block;
  margin-bottom: 8px;
}

.claim-bar {
  background: var(--deep);
  color: #fff;
  padding: 28px 32px;
  font-family: var(--font-display);
  font-size: var(--step-3);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 40px 0;
}
.claim-bar span { color: #E8A87C; }

/* Two-column content layout */
.split {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 56px;
  align-items: start;
}
.aside-box {
  background: var(--sand);
  padding: 28px;
  position: sticky;
  top: calc(var(--header-h) + 20px);
}
.aside-box h4 {
  font-family: var(--font-display);
  font-size: var(--step-2);
  text-transform: uppercase;
  color: var(--deep);
  margin: 0 0 12px;
}
.aside-box p { font-size: var(--step--1); color: var(--ink-60); }

/* ==========================================================================
   Selector tool
   ========================================================================== */

.selector { background: var(--sand); padding: 32px; }
.selector__controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-60);
  margin-bottom: 6px;
}
.field select, .field input, .field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--step-0);
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
}
.field select:focus, .field input:focus, .field textarea:focus {
  border-color: var(--deep);
  outline: 2px solid var(--clay);
  outline-offset: 0;
}
.result-count {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-60);
  margin-bottom: 14px;
}
.empty-state {
  padding: 40px 24px;
  text-align: center;
  color: var(--ink-60);
  background: var(--white);
  border: 1px dashed var(--line);
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.field--full { grid-column: 1 / -1; }
.field .req { color: var(--clay); }
.consent {
  display: flex; gap: 12px; align-items: flex-start;
  font-size: var(--step--1); color: var(--ink-60);
  margin-top: 4px;
}
.consent input { margin-top: 3px; flex-shrink: 0; }
.form-note {
  font-size: var(--step--1);
  color: var(--ink-40);
  margin-top: 16px;
}

/* ==========================================================================
   CTA band
   ========================================================================== */

.cta-band {
  background: var(--clay);
  color: #fff;
  padding-block: 56px;
}
.cta-band__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 32px; flex-wrap: wrap;
}
.cta-band h2 {
  font-family: var(--font-display);
  font-size: var(--step-3);
  text-transform: uppercase;
  margin: 0 0 6px;
}
.cta-band p { margin: 0; color: #FBE3D5; }
.cta-band .btn--ghost-light:hover { color: var(--clay); }

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--deep-dark);
  color: #9FB0BF;
  padding-block: 56px 0;
  font-size: var(--step-0);
}
.site-footer h4 {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #fff;
  margin: 0 0 16px;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 9px; }
.site-footer a { color: #9FB0BF; text-decoration: none; }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo__mark { color: #fff; font-size: 1.7rem; }
.footer-brand p { font-size: var(--step--1); margin-top: 14px; max-width: 34ch; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding-block: 22px;
  display: flex; justify-content: space-between; gap: 20px;
  flex-wrap: wrap;
  font-size: var(--step--1);
}
.footer-bottom p { margin: 0; }

.disclaimer {
  background: var(--sand);
  padding: 20px 0;
  font-size: var(--step--1);
  color: var(--ink-40);
  border-top: 1px solid var(--line);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1000px) {
  .hero__grid { grid-template-columns: 1fr; gap: 32px; }
  .split { grid-template-columns: 1fr; gap: 36px; }
  .aside-box { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .gloss-scale__ticks { grid-template-columns: repeat(3, 1fr); }
  .gloss-tick { padding-bottom: 14px; }
}

@media (max-width: 760px) {
  :root { --step-5: 2.5rem; --step-4: 2rem; --step-3: 1.5rem; --header-h: 72px; }

  .nav {
    display: none;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch;
    padding: 8px 0;
  }
  .nav.is-open { display: flex; }
  .nav__link { padding: 14px 24px; border-bottom: 1px solid var(--line); }
  .nav__link:last-child { border-bottom: 0; }
  .nav-toggle { display: flex; }
  .site-header__inner { position: relative; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .selector__controls { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .gloss-scale__ticks { grid-template-columns: repeat(2, 1fr); }
  .section { padding-block: 56px; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-band__inner { flex-direction: column; align-items: flex-start; }
  .topbar__inner { justify-content: center; gap: 16px; }
}

/* ==========================================================================
   Print
   ========================================================================== */

@media print {
  .site-header, .topbar, .cta-band, .site-footer, .nav-toggle { display: none; }
  body { color: #000; }
  .hero, .page-head, .section--deep { background: #fff !important; color: #000 !important; }
}