@layer base, layout, components, utilities;

:root {
  /* Tier 1: FirmStone Official Brand Palette (Style Guide v1.1) */
  --color-sandstone: #ede3d5;
  --color-crimson: #751c39;
  --color-slate: #0c3d45;
  --color-quartz: #f3f9f7;
  --color-bedrock: #282828;
  --color-white: #ffffff;

  /* Tier 2: Semantic Surface & Border Tokens */
  --surface-page: var(--color-quartz);
  --surface-card: var(--color-white);
  --surface-warm: var(--color-sandstone);
  --surface-dark: var(--color-slate);
  --surface-footer: var(--color-bedrock);
  --border-subtle: color-mix(in oklab, var(--color-slate) 16%, transparent);

  /* Typography (Style Guide pp. 21–26) */
  --font-heading: 'Source Sans 3', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'DM Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Layout Rhythm & Tailored Radii (6px–8px) */
  --container-max: 72rem;
  --section-pad-block: clamp(3.5rem, 6vw, 5.5rem);
  --gutter-inline: clamp(1.25rem, 4vw, 2.5rem);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
}

@layer base {
  :where(html, body, header, nav, main, section, article, aside, footer, div, h1, h2, h3, p, ul, li, figure, a, img, svg) {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
    color-scheme: light;
  }

  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }
  }

  body {
    background-color: var(--surface-page);
    color: var(--color-bedrock);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.5;
    text-align: start;
    overflow-wrap: break-word;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  :where(img, svg) {
    display: block;
    max-inline-size: 100%;
  }

  :where(h1, h2, h3) {
    font-family: var(--font-heading);
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: 0;
    color: var(--color-slate);
    text-wrap: balance;
  }

  :where(p, li) {
    text-wrap: pretty;
  }

  p {
    max-inline-size: 64ch;
  }

  ul[role="list"] {
    list-style: none;
  }

  a {
    color: inherit;
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.2em;
  }

  :where(a:any-link, button):focus-visible {
    outline: 3px solid var(--color-crimson);
    outline-offset: 3px;
    border-radius: 2px;
  }
}

@layer layout {
  .container {
    inline-size: min(100% - (var(--gutter-inline) * 2), var(--container-max));
    margin-inline: auto;
  }

  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 20;
    background-color: var(--surface-page);
    border-block-end: 1px solid var(--border-subtle);
  }

  .header-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: safe center;
    justify-content: space-between;
    gap: 1rem 1.5rem;
    padding-block: 0.95rem;
  }

  .hero-section {
    background-color: var(--surface-page);
    padding-block: clamp(3rem, 6vw, 5.25rem) clamp(3.5rem, 6.5vw, 5.5rem);
  }

  .hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.88fr);
    gap: clamp(2rem, 4.5vw, 3.75rem);
    align-items: center;
  }

  @media (max-width: 56rem) {
    .hero-grid {
      grid-template-columns: 1fr;
    }
  }

  .brands-band {
    background-color: var(--surface-warm);
    border-block: 1px solid var(--border-subtle);
    padding-block: clamp(2.75rem, 5vw, 3.85rem);
  }

  .capabilities-section {
    background-color: var(--surface-card);
    padding-block: var(--section-pad-block);
  }

  .leadership-section {
    background-color: var(--surface-dark);
    color: var(--color-sandstone);
    padding-block: var(--section-pad-block);
  }

  .leadership-section :where(a:any-link, button):focus-visible {
    outline-color: var(--color-sandstone);
  }

  .contact-section {
    background-color: var(--surface-warm);
    padding-block: clamp(3.25rem, 5.5vw, 4.5rem);
  }

  .site-footer {
    background-color: var(--surface-footer);
    color: var(--color-sandstone);
    padding-block: 2rem;
  }

  .site-footer :where(a:any-link, button):focus-visible {
    outline-color: var(--color-sandstone);
  }
}

@layer components {
  /* Header & Navigation */
  .brand-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    padding-block: 0.25rem;
  }

  .brand-logo {
    block-size: clamp(2.1rem, 3vw, 2.5rem);
    inline-size: auto;
  }

  .primary-nav {
    display: flex;
    flex-wrap: wrap;
    flex-wrap: balance;
    align-items: safe center;
    gap: 0.5rem 1.5rem;
  }

  .nav-list {
    display: flex;
    flex-wrap: wrap;
    flex-wrap: balance;
    align-items: safe center;
    gap: 0.25rem 1.25rem;
    list-style: none;
  }

  .nav-link {
    display: inline-flex;
    align-items: center;
    min-block-size: 2.5rem;
    padding-inline: 0.35rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-slate);
    text-decoration: none;
    transition: color 0.18s ease;
  }

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

  @media (max-width: 40rem) {
    .nav-list {
      display: none;
    }
  }

  /* Hero Typography (Style Guide p. 26 Archetype) */
  .eyebrow {
    font-family: var(--font-heading);
    font-size: 0.8125rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-slate);
    margin-block-end: 0.75rem;
  }

  .hero-headline {
    font-size: clamp(2.35rem, 1.65rem + 2.8vw, 3.65rem);
    line-height: 1.18;
    letter-spacing: 0;
    color: var(--color-crimson);
    margin-block-end: 0.875rem;
    max-inline-size: 16ch;
  }

  .hero-subhead {
    font-family: var(--font-heading);
    font-size: clamp(1.2rem, 1.02rem + 0.7vw, 1.5rem);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0;
    color: var(--color-slate);
    margin-block-end: 1.125rem;
    max-inline-size: 44ch;
    text-wrap: balance;
  }

  .hero-copy {
    font-size: 1.0625rem;
    line-height: 1.55;
    color: var(--color-bedrock);
    margin-block-end: 1.875rem;
    max-inline-size: 56ch;
  }

  /* Buttons (Style Guide pp. 26–30) */
  .cta-group {
    display: flex;
    flex-wrap: wrap;
    flex-wrap: balance;
    align-items: safe center;
    gap: 0.875rem;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-block-size: 2.875rem;
    padding-block: 0.7rem;
    padding-inline: 1.35rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.96875rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    text-decoration: none;
    border: 1.5px solid transparent;
    transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  }

  .btn-sm {
    min-block-size: 2.375rem;
    padding-block: 0.45rem;
    padding-inline: 1rem;
    font-size: 0.875rem;
  }

  .btn-primary {
    background-color: var(--color-crimson);
    color: var(--color-quartz);
  }

  .btn-primary:hover {
    background-color: color-mix(in oklab, var(--color-crimson), black 16%);
  }

  .btn-secondary {
    background-color: var(--color-slate);
    color: var(--color-quartz);
  }

  .btn-secondary:hover {
    background-color: color-mix(in oklab, var(--color-slate), black 18%);
  }

  .btn-icon {
    inline-size: 1.05rem;
    block-size: 1.05rem;
    flex-shrink: 0;
  }

  @media (pointer: coarse) {
    .btn {
      min-block-size: 3rem;
      padding-inline: 1.45rem;
    }
  }

  /* Hero Anchor Card (Solid Midnight Slate Surface) */
  .anchor-card {
    background-color: var(--surface-dark);
    color: var(--color-quartz);
    border-radius: var(--radius-md);
    padding: clamp(1.65rem, 3vw, 2.25rem);
  }

  .anchor-card-eyebrow {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-sandstone);
    margin-block-end: 0.45rem;
  }

  .anchor-card-title {
    color: var(--color-white);
    font-size: clamp(1.35rem, 1.15rem + 0.6vw, 1.6rem);
    margin-block-end: 1.2rem;
    padding-block-end: 0.875rem;
    border-block-end: 1px solid color-mix(in oklab, var(--color-sandstone) 24%, transparent);
    text-wrap: wrap;
  }

  .pillar-list {
    display: grid;
    gap: 1rem;
  }

  .pillar-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.75rem;
    align-items: start;
  }

  .pillar-bullet {
    inline-size: 1rem;
    block-size: 1rem;
    margin-block-start: 0.25rem;
    color: var(--color-sandstone);
  }

  .pillar-copy {
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--color-quartz);
  }

  .pillar-copy strong {
    color: var(--color-sandstone);
    font-weight: 700;
  }

  /* Selected Brand Experience Band (Unboxed Typographic Grid on Solid Warm Sandstone) */
  .brands-header {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.5rem 1.5rem;
    margin-block-end: 1.75rem;
    padding-block-end: 0.875rem;
    border-block-end: 1px solid var(--border-subtle);
  }

  .brands-heading {
    font-size: 0.875rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-crimson);
  }

  .brands-note {
    font-size: 0.9375rem;
    color: var(--color-slate);
    font-weight: 500;
  }

  .brands-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem 2rem;
  }

  @media (max-width: 58rem) {
    .brands-grid {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }
  }

  @media (max-width: 38rem) {
    .brands-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 1.25rem 1.25rem;
    }
  }

  .brand-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
  }

  .brand-name {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 900;
    color: var(--color-bedrock);
    letter-spacing: 0;
    line-height: 1.2;
  }

  .brand-sector {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-slate);
    line-height: 1.35;
  }

  /* Capabilities Section (CSS Subgrid Alignment) */
  .section-intro {
    margin-block-end: clamp(2rem, 4vw, 2.75rem);
  }

  .section-title {
    font-size: clamp(1.85rem, 1.45rem + 1.5vw, 2.5rem);
    color: var(--color-slate);
    margin-block-end: 0.6rem;
  }

  .section-subtitle {
    font-size: 1.0625rem;
    line-height: 1.5;
    color: var(--color-bedrock);
    max-inline-size: 58ch;
  }

  .capabilities-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-auto-rows: auto;
    gap: 1.5rem;
  }

  .capability-card {
    grid-row: span 2;
    display: grid;
    grid-template-rows: auto 1fr;
    grid-template-rows: subgrid;
    gap: 0.75rem;
    background-color: var(--surface-page);
    border: 1px solid var(--border-subtle);
    border-block-start: 4px solid var(--color-crimson);
    border-radius: var(--radius-sm);
    padding: 1.75rem 1.6rem;
  }

  .capability-card:nth-child(2) {
    border-block-start-color: var(--color-slate);
  }

  @media (max-width: 54rem) {
    .capabilities-grid {
      grid-template-columns: 1fr;
    }

    .capability-card {
      grid-row: auto;
      grid-template-rows: auto;
    }
  }

  .capability-title {
    font-size: 1.3125rem;
    color: var(--color-bedrock);
    text-wrap: wrap;
  }

  .capability-body {
    font-size: 0.96875rem;
    line-height: 1.55;
    color: var(--color-bedrock);
  }

  /* Leadership Section */
  .leadership-wrapper {
    container: bio / inline-size;
  }

  .leadership-grid {
    display: grid;
    grid-template-columns: minmax(13rem, 17.5rem) minmax(0, 1fr);
    gap: clamp(2rem, 4.5vw, 3.5rem);
    align-items: center;
  }

  @container bio (inline-size < 44rem) {
    .leadership-grid {
      grid-template-columns: 1fr;
    }
  }

  .portrait-frame {
    inline-size: min(100%, 17.5rem);
    aspect-ratio: 1 / 1;
    border-radius: var(--radius-md);
    overflow: clip;
    border: 2px solid var(--color-sandstone);
    background-color: var(--color-bedrock);
  }

  .portrait-img {
    inline-size: 100%;
    block-size: 100%;
    object-fit: cover;
  }

  .leadership-title {
    color: var(--color-white);
    font-size: clamp(1.85rem, 1.45rem + 1.5vw, 2.45rem);
    margin-block-end: 0.35rem;
  }

  .leadership-role {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--color-sandstone);
    margin-block-end: 1.25rem;
  }

  .leadership-bio {
    display: grid;
    gap: 1rem;
    color: var(--color-quartz);
    font-size: 1.03125rem;
    line-height: 1.55;
  }

  .leadership-bio strong {
    color: var(--color-white);
    font-weight: 700;
  }

  /* Contact Section (Direct on Solid Warm Sandstone Surface) */
  .contact-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: safe center;
    justify-content: space-between;
    gap: 1.75rem 2.5rem;
  }

  .contact-title {
    font-size: clamp(1.75rem, 1.4rem + 1.2vw, 2.25rem);
    color: var(--color-crimson);
    margin-block-end: 0.5rem;
  }

  .contact-copy {
    font-size: 1.03125rem;
    line-height: 1.5;
    color: var(--color-bedrock);
    max-inline-size: 52ch;
  }

  /* Footer */
  .footer-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: safe center;
    justify-content: space-between;
    gap: 1.25rem 2rem;
  }

  .footer-logo {
    block-size: 1.9rem;
    inline-size: auto;
  }

  .footer-meta {
    display: flex;
    flex-wrap: wrap;
    flex-wrap: balance;
    align-items: safe center;
    gap: 0.5rem 1.5rem;
    font-size: 0.875rem;
    color: var(--color-sandstone);
  }

  .footer-link {
    color: var(--color-sandstone);
    text-decoration: none;
    font-weight: 600;
  }

  .footer-link:hover {
    text-decoration: underline;
  }
}

@layer utilities {
  .visually-hidden:where(:not(:focus-within, :active)) {
    position: absolute !important;
    clip-path: inset(50%) !important;
    overflow: hidden !important;
    width: 1px !important;
    height: 1px !important;
    margin: -1px !important;
    padding: 0 !important;
    border: 0 !important;
    white-space: nowrap !important;
  }

  .skip-link:is(:focus-within, :active) {
    position: fixed;
    inset-block-start: 0.75rem;
    inset-inline-start: 0.75rem;
    z-index: 100;
    background-color: var(--color-crimson);
    color: var(--color-white);
    padding: 0.65rem 1.1rem;
    border-radius: var(--radius-sm);
    font-weight: 700;
    text-decoration: none;
  }

  @media (forced-colors: active) {
    .anchor-card,
    .capability-card,
    .btn {
      border: 1px solid CanvasText;
    }
  }
}