/*
 * ATG public landing page — stylesheet.
 *
 * Master tokens below extend (not replace) ../design/tokens/atg-tokens.css,
 * copied by hand rather than <link>ed so this page stays a fully
 * self-contained static artifact regardless of where it is deployed. If
 * atg-tokens.css changes, re-sync the shared block by hand.
 *
 * This page adds a second, ecosystem-level "master brand" layer (deep
 * navy + electric blue/violet/azure) reserved for global chrome (header,
 * hero, dark rhythm sections, footer) and the primary "Enter Gateway"
 * action. Department accents (gateway blue / markets teal / participation
 * bronze) stay reserved for each department's own section and CTA, per
 * design/ATG_EXPERIENCE_SYSTEM_V0.1.md §3/§11 — the two palettes are never
 * mixed within one component.
 *
 * Breakpoints follow design/RESPONSIVE_SYSTEM.md: mobile 0 / tablet 640 /
 * desktop 1024 / wide 1280. Shared component classes are declared inside
 * @layer components (per RESPONSIVE_SYSTEM.md's documented CSS-layer bug)
 * so any future utility class always wins a specificity tie.
 */

:root {
  /* master brand (light surfaces — unchanged from design/tokens/atg-tokens.css) */
  --atg-color-ink: #12192b;
  --atg-color-ink-strong: #0b1220;
  --atg-color-paper: #fffdf9;
  --atg-color-surface: #f7f5f0;
  --atg-color-border: color-mix(in srgb, #12192b 10%, transparent);
  --atg-color-muted: #4d5b7c;
  --atg-color-subtle: #8d99b8;

  /* department accents — never semantic status colors */
  --atg-accent-gateway: #2b5797;
  --atg-accent-markets: #1f6f5c;
  --atg-accent-participation: #8f5a2e;

  /* semantic status — universal, never a department accent */
  --atg-positive: #15803d;
  --atg-negative: #b42318;
  --atg-warning: #b45309;
  --atg-info: #2e4b8f;

  /* ecosystem-level dark/master brand layer — reserved for global chrome */
  --atg-navy-deep: #07111f;
  --atg-navy: #0a1830;
  --atg-blue: #315cff;
  --atg-blue-strong: #2647d1;
  --atg-violet: #7647ff;
  --atg-azure: #23a7ff;
  --atg-on-dark-heading: #fff;
  --atg-on-dark-body: #c9d2e3;
  --atg-on-dark-border: color-mix(in srgb, #fff 14%, transparent);

  /* space */
  --atg-space-1: 4px;
  --atg-space-2: 8px;
  --atg-space-3: 12px;
  --atg-space-4: 16px;
  --atg-space-5: 20px;
  --atg-space-6: 24px;
  --atg-space-8: 32px;
  --atg-space-10: 40px;
  --atg-space-12: 48px;
  --atg-space-16: 64px;
  --atg-space-24: 96px;

  /* radius */
  --atg-radius-md: 6px;
  --atg-radius-lg: 8px;
  --atg-radius-xl: 12px;
  --atg-radius-pill: 9999px;

  /* shadow */
  --atg-shadow-sm: 0 1px 2px rgb(18 25 43 / 6%);
  --atg-shadow-md: 0 4px 12px rgb(18 25 43 / 8%);
  --atg-shadow-lg: 0 16px 40px rgb(7 17 31 / 22%);

  /* container widths */
  --atg-container-content: 1024px;
  --atg-container-xl: 1280px;
  --atg-container-narrow: 720px;

  /* fonts — Archivo (display) / IBM Plex Sans (body) / IBM Plex Mono (addresses, labels) */
  --atg-font-display: "Archivo", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --atg-font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --atg-font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;
  --header-height: 76px;
}

@layer reset, components;

@layer reset {
  * {
    box-sizing: border-box;
  }

  html,
  body {
    margin: 0;
    padding: 0;
  }

  html {
    text-size-adjust: 100%;
  }

  body {
    font-family: var(--atg-font-sans);
    background: var(--atg-color-paper);
    color: var(--atg-color-ink);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

  a {
    color: inherit;
  }

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

  h1,
  h2,
  h3,
  p {
    margin: 0;
  }

  ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  @media (prefers-reduced-motion: no-preference) {
    html {
      scroll-behavior: smooth;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      animation-duration: 0.001ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.001ms !important;
      scroll-behavior: auto !important;
    }
  }
}

@layer components {
  /* --- layout primitives --- */

  .wrap {
    max-width: var(--atg-container-xl);
    margin: 0 auto;
    padding-inline: var(--atg-space-6);
  }

  .section-narrow {
    max-width: var(--atg-container-narrow);
  }

  .skip-link {
    position: absolute;
    left: var(--atg-space-3);
    top: -48px;
    background: var(--atg-navy-deep);
    color: var(--atg-on-dark-heading);
    padding: var(--atg-space-3) var(--atg-space-5);
    border-radius: var(--atg-radius-md);
    z-index: 200;
    text-decoration: none;
    font-weight: 600;
    transition: top 0.15s ease;
  }

  .skip-link:focus-visible {
    top: var(--atg-space-3);
  }

  section[id] {
    scroll-margin-top: var(--header-height);
  }

  .eyebrow {
    font-family: var(--atg-font-sans);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--atg-color-muted);
    margin-bottom: var(--atg-space-3);
  }

  .eyebrow-on-dark {
    color: var(--atg-on-dark-body);
  }

  .eyebrow--gateway {
    color: var(--atg-accent-gateway);
  }

  .eyebrow--markets {
    color: var(--atg-accent-markets);
  }

  .eyebrow--participation {
    color: var(--atg-accent-participation);
  }

  .section {
    padding-block: var(--atg-space-24);
  }

  .section-paper {
    background: var(--atg-color-paper);
  }

  .section-surface {
    background: var(--atg-color-surface);
  }

  .section-dark {
    background: linear-gradient(180deg, var(--atg-navy-deep), var(--atg-navy));
    color: var(--atg-on-dark-body);
  }

  .section h2 {
    font-family: var(--atg-font-display);
    font-weight: 700;
    font-size: clamp(28px, 3.4vw, 42px);
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--atg-color-ink);
    max-width: 780px;
  }

  .section h2.on-dark {
    color: var(--atg-on-dark-heading);
  }

  .section-lede {
    margin-top: var(--atg-space-5);
    font-size: 16.5px;
    line-height: 1.65;
    color: var(--atg-color-muted);
    max-width: 680px;
  }

  .on-dark-lede {
    color: var(--atg-on-dark-body);
  }

  /* --- header --- */

  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--atg-navy-deep) 96%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--atg-on-dark-border);
    min-height: var(--header-height);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--atg-space-6);
    min-height: var(--header-height);
  }

  .wordmark {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
  }

  .wordmark img {
    display: block;
    height: 26px;
    width: auto;
  }

  .primary-nav {
    flex: 1;
    display: none;
  }

  .primary-nav ul {
    display: flex;
    justify-content: center;
    gap: var(--atg-space-8);
  }

  .primary-nav a {
    position: relative;
    display: inline-block;
    padding-block: var(--atg-space-2);
    font-size: 14px;
    font-weight: 500;
    color: var(--atg-on-dark-body);
    text-decoration: none;
    white-space: nowrap;
  }

  .primary-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 100%;
    bottom: 0;
    height: 2px;
    background: var(--atg-azure);
    transition: right 0.2s ease;
  }

  .primary-nav a:hover,
  .primary-nav a:focus-visible {
    color: var(--atg-on-dark-heading);
  }

  .primary-nav a:hover::after,
  .primary-nav a:focus-visible::after {
    right: 0;
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: var(--atg-space-4);
    flex-shrink: 0;
  }

  .mobile-nav {
    position: relative;
  }

  .mobile-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--atg-on-dark-border);
    border-radius: var(--atg-radius-md);
    cursor: pointer;
    list-style: none;
  }

  .mobile-nav-toggle::-webkit-details-marker {
    display: none;
  }

  .mobile-nav-toggle:focus-visible {
    outline: 2px solid var(--atg-azure);
    outline-offset: 2px;
  }

  .hamburger,
  .hamburger::before,
  .hamburger::after {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--atg-on-dark-heading);
    border-radius: 2px;
  }

  .hamburger {
    position: relative;
  }

  .hamburger::before,
  .hamburger::after {
    content: "";
    position: absolute;
    left: 0;
  }

  .hamburger::before {
    top: -6px;
  }

  .hamburger::after {
    top: 6px;
  }

  .mobile-nav-panel {
    position: absolute;
    right: 0;
    top: calc(100% + var(--atg-space-3));
    background: var(--atg-navy);
    border: 1px solid var(--atg-on-dark-border);
    border-radius: var(--atg-radius-lg);
    box-shadow: var(--atg-shadow-lg);
    padding: var(--atg-space-3);
    min-width: 240px;
  }

  .mobile-nav-panel ul {
    display: flex;
    flex-direction: column;
    gap: var(--atg-space-1);
  }

  /* stylelint-disable-next-line no-descending-specificity -- unrelated
     component (mobile nav panel vs. .primary-nav); both end in a bare `a`,
     the rule's comparison bucket, but never match the same element. */
  .mobile-nav-panel a {
    display: block;
    padding: var(--atg-space-3) var(--atg-space-3);
    border-radius: var(--atg-radius-md);
    color: var(--atg-on-dark-body);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    min-height: 40px;
  }

  .mobile-nav-panel a:hover,
  .mobile-nav-panel a:focus-visible {
    background: color-mix(in srgb, var(--atg-on-dark-heading) 8%, transparent);
    color: var(--atg-on-dark-heading);
  }

  .mobile-nav-cta {
    margin-top: var(--atg-space-2);
    padding-top: var(--atg-space-2);
    border-top: 1px solid var(--atg-on-dark-border);
  }

  /* stylelint-disable-next-line no-descending-specificity -- unrelated
     component, same bare-`a` bucket false positive as above. */
  .mobile-nav-cta a {
    color: var(--atg-blue);
    font-weight: 700;
  }

  /* --- buttons --- */

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--atg-radius-md);
    padding: 12px 22px;
    font-family: var(--atg-font-sans);
    font-size: 14px;
    font-weight: 600;
    border: 1px solid transparent;
    text-decoration: none;
    min-height: 44px;
    transition:
      background-color 0.15s ease,
      border-color 0.15s ease,
      transform 0.15s ease;
  }

  .btn-primary {
    background: var(--atg-blue);
    color: #fff;
  }

  .btn-primary:hover,
  .btn-primary:focus-visible {
    background: var(--atg-blue-strong);
  }

  .btn-compact {
    padding: 9px 18px;
    min-height: 38px;
    font-size: 13.5px;
  }

  .btn-ghost {
    background: transparent;
    border-color: var(--atg-on-dark-border);
    color: var(--atg-on-dark-heading);
  }

  .btn-ghost:hover,
  .btn-ghost:focus-visible {
    background: color-mix(in srgb, var(--atg-on-dark-heading) 8%, transparent);
    border-color: color-mix(in srgb, var(--atg-on-dark-heading) 30%, transparent);
  }

  .btn:focus-visible {
    outline: 2px solid var(--atg-azure);
    outline-offset: 2px;
  }

  .btn-dept {
    color: #fff;
    margin-top: var(--atg-space-6);
  }

  .btn-dept--gateway {
    background: var(--atg-accent-gateway);
  }

  .btn-dept--gateway:hover,
  .btn-dept--gateway:focus-visible {
    background: color-mix(in srgb, var(--atg-accent-gateway) 85%, black);
  }

  .btn-dept--markets {
    background: var(--atg-accent-markets);
  }

  .btn-dept--markets:hover,
  .btn-dept--markets:focus-visible {
    background: color-mix(in srgb, var(--atg-accent-markets) 85%, black);
  }

  .btn-dept--participation {
    background: var(--atg-accent-participation);
  }

  .btn-dept--participation:hover,
  .btn-dept--participation:focus-visible {
    background: color-mix(in srgb, var(--atg-accent-participation) 85%, black);
  }

  /* --- hero --- */

  .hero {
    position: relative;
    background: linear-gradient(160deg, var(--atg-navy-deep) 0%, var(--atg-navy) 62%, #0d1f42 100%);
    overflow: hidden;
    padding-block: var(--atg-space-24) calc(var(--atg-space-24) + var(--atg-space-8));
  }

  .hero-field {
    position: absolute;
    inset: 0;
    overflow: hidden;
  }

  .hero-network {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.8;
  }

  .hero-panel {
    position: absolute;
    top: -10%;
    right: -12%;
    width: 60%;
    height: 130%;
    background: linear-gradient(135deg, color-mix(in srgb, var(--atg-blue) 20%, transparent), color-mix(in srgb, var(--atg-violet) 16%, transparent) 60%, transparent 100%);
    clip-path: polygon(30% 0%, 100% 0%, 100% 100%, 0% 100%);
    filter: blur(2px);
  }

  .hero-content {
    position: relative;
    max-width: 700px;
  }

  .hero h1 {
    font-family: var(--atg-font-display);
    font-weight: 700;
    font-size: clamp(34px, 5vw, 56px);
    line-height: 1.1;
    letter-spacing: -0.015em;
    color: var(--atg-on-dark-heading);
    margin-bottom: var(--atg-space-6);
  }

  .hero-lede {
    font-size: 18px;
    line-height: 1.65;
    color: var(--atg-on-dark-body);
    max-width: 560px;
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--atg-space-4);
    margin-top: var(--atg-space-10);
  }

  /* --- platform preview cards --- */

  .preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--atg-space-5);
    margin-top: var(--atg-space-10);
  }

  .preview-card {
    display: flex;
    flex-direction: column;
    gap: var(--atg-space-2);
    background: var(--atg-color-paper);
    border: 1px solid var(--atg-color-border);
    border-top: 3px solid var(--atg-preview-accent, var(--atg-color-border));
    border-radius: var(--atg-radius-lg);
    box-shadow: var(--atg-shadow-sm);
    padding: var(--atg-space-6);
    text-decoration: none;
    color: var(--atg-color-ink);
    min-width: 0;
    transition:
      box-shadow 0.15s ease,
      transform 0.15s ease;
  }

  .preview-card:hover,
  .preview-card:focus-visible {
    box-shadow: var(--atg-shadow-md);
    transform: translateY(-2px);
  }

  .preview-card:focus-visible {
    outline: 2px solid var(--atg-info);
    outline-offset: 2px;
  }

  .preview-card--gateway {
    --atg-preview-accent: var(--atg-accent-gateway);
  }

  .preview-card--markets {
    --atg-preview-accent: var(--atg-accent-markets);
  }

  .preview-card--participation {
    --atg-preview-accent: var(--atg-accent-participation);
  }

  .preview-eyebrow {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--atg-preview-accent);
  }

  .preview-title {
    font-family: var(--atg-font-display);
    font-weight: 600;
    font-size: 17px;
    color: var(--atg-color-ink);
  }

  .preview-link {
    margin-top: auto;
    padding-top: var(--atg-space-3);
    font-size: 13px;
    font-weight: 600;
    color: var(--atg-color-muted);
  }

  /* --- department sections --- */

  .section-split {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--atg-space-12);
    align-items: start;
  }

  .section-split--reverse {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .section-split--reverse .section-split-copy {
    order: 2;
  }

  .capability-list {
    display: flex;
    flex-direction: column;
    gap: var(--atg-space-3);
    padding: var(--atg-space-6);
    background: var(--atg-color-paper);
    border: 1px solid var(--atg-color-border);
    border-radius: var(--atg-radius-lg);
    box-shadow: var(--atg-shadow-sm);
  }

  .section-split--reverse .capability-list {
    order: 1;
  }

  .capability-list li {
    position: relative;
    padding-left: var(--atg-space-5);
    font-size: 14.5px;
    color: var(--atg-color-ink);
    font-weight: 500;
  }

  .capability-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 9px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--atg-list-accent, var(--atg-color-muted));
  }

  .capability-list--gateway {
    --atg-list-accent: var(--atg-accent-gateway);
  }

  .capability-list--markets {
    background: var(--atg-color-surface);

    --atg-list-accent: var(--atg-accent-markets);
  }

  .capability-list--participation {
    --atg-list-accent: var(--atg-accent-participation);
  }

  /* --- architecture diagram --- */

  .arch-diagram {
    margin-top: var(--atg-space-12);
    display: flex;
    align-items: stretch;
    gap: var(--atg-space-4);
  }

  .arch-node {
    flex: 1;
    min-width: 0;
    background: color-mix(in srgb, var(--atg-on-dark-heading) 4%, transparent);
    border: 1px solid var(--atg-on-dark-border);
    border-radius: var(--atg-radius-xl);
    padding: var(--atg-space-6) var(--atg-space-5);
  }

  .arch-node-index {
    display: block;
    font-family: var(--atg-font-mono);
    font-size: 12px;
    color: var(--atg-azure);
    margin-bottom: var(--atg-space-3);
  }

  .arch-node h3 {
    font-family: var(--atg-font-display);
    font-weight: 600;
    font-size: 19px;
    color: var(--atg-on-dark-heading);
    margin-bottom: var(--atg-space-2);
  }

  .arch-node p {
    font-size: 13.5px;
    color: var(--atg-on-dark-body);
    line-height: 1.5;
  }

  .arch-node-tag {
    display: inline-block;
    margin-top: var(--atg-space-4);
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--atg-on-dark-body);
    border: 1px solid var(--atg-on-dark-border);
    border-radius: var(--atg-radius-pill);
    padding: 3px 10px;
  }

  .arch-connector {
    flex: 0 0 auto;
    width: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .arch-connector svg {
    width: 100%;
    height: 24px;
  }

  /* --- trust grid --- */

  .trust-grid {
    margin-top: var(--atg-space-10);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--atg-space-6);
  }

  .trust-card {
    padding: var(--atg-space-6);
    border: 1px solid var(--atg-color-border);
    border-radius: var(--atg-radius-lg);
    background: var(--atg-color-paper);
    transition: border-color 0.15s ease;
  }

  .trust-card:hover {
    border-color: color-mix(in srgb, var(--atg-info) 40%, var(--atg-color-border));
  }

  .trust-icon {
    display: inline-flex;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: var(--atg-radius-md);
    background: color-mix(in srgb, var(--atg-info) 8%, transparent);
    color: var(--atg-info);
    margin-bottom: var(--atg-space-4);
  }

  .trust-icon svg {
    width: 20px;
    height: 20px;
  }

  .trust-card h3 {
    font-family: var(--atg-font-display);
    font-weight: 600;
    font-size: 16.5px;
    color: var(--atg-color-ink);
    margin-bottom: var(--atg-space-2);
  }

  .trust-card p {
    font-size: 13.5px;
    line-height: 1.55;
    color: var(--atg-color-muted);
  }

  /* --- footer --- */

  .site-footer {
    background: var(--atg-navy-deep);
    color: var(--atg-on-dark-body);
    padding-block: var(--atg-space-12) var(--atg-space-8);
  }

  .footer-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--atg-space-6);
    padding-bottom: var(--atg-space-8);
    border-bottom: 1px solid var(--atg-on-dark-border);
  }

  .footer-nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: var(--atg-space-6);
  }

  /* stylelint-disable-next-line no-descending-specificity -- unrelated
     component (footer nav vs. .primary-nav), same bare-`a` bucket. */
  .footer-nav a {
    font-size: 13.5px;
    color: var(--atg-on-dark-body);
    text-decoration: none;
  }

  .footer-nav a:hover,
  .footer-nav a:focus-visible {
    color: var(--atg-on-dark-heading);
  }

  .footer-disclosure {
    margin-top: var(--atg-space-6);
    max-width: 760px;
    font-size: 12.5px;
    line-height: 1.6;
    color: var(--atg-on-dark-body);
  }

  .footer-bottom {
    margin-top: var(--atg-space-6);
    display: flex;
    flex-wrap: wrap;
    gap: var(--atg-space-2) var(--atg-space-6);
    font-size: 12px;
    color: var(--atg-on-dark-body);
  }

  .footer-bottom .entity-line {
    font-weight: 600;
    color: var(--atg-on-dark-heading);
  }

  /* stylelint-disable-next-line no-descending-specificity -- deliberate
     universal focus-visible fallback; kept last on purpose so it reads as
     the baseline every component's own focus style sits on top of. */
  a:focus-visible,
  button:focus-visible {
    outline: 2px solid var(--atg-info);
    outline-offset: 2px;
  }
}

/* --- Responsive --- */

@media (width >= 1024px) {
  .primary-nav {
    display: block;
  }

  .mobile-nav {
    display: none;
  }
}

@media (width <= 1023px) {
  .preview-grid {
    grid-template-columns: 1fr;
  }

  .section-split,
  .section-split--reverse {
    grid-template-columns: 1fr;
  }

  .section-split--reverse .section-split-copy,
  .section-split--reverse .capability-list {
    order: initial;
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .arch-diagram {
    flex-direction: column;
  }

  .arch-connector {
    width: 100%;
    height: 32px;
  }

  .arch-connector svg {
    width: 24px;
    height: 100%;
    transform: rotate(90deg);
  }
}

@media (width <= 639px) {
  .wrap {
    padding-inline: var(--atg-space-4);
  }

  .section {
    padding-block: var(--atg-space-16);
  }

  .hero {
    padding-block: var(--atg-space-16) var(--atg-space-12);
  }

  .hero-actions .btn {
    width: 100%;
  }

  .header-actions .btn-compact {
    display: none;
  }

  .trust-grid {
    grid-template-columns: 1fr;
  }

  .capability-list {
    padding: var(--atg-space-5);
  }

  .btn-dept {
    width: 100%;
  }
}