/**
 * ARSO Legal Pages — shared presentation layer
 * Authority: ARSO_DESIGN_SYSTEM.md (Apple HIG / SF Pro / system colors)
 * Scope: visual presentation only. Do not alter legal copy in page HTML.
 */

/* -------------------------------------------------------------------------- */
/* Design tokens (semantic → CSS custom properties)                           */
/* -------------------------------------------------------------------------- */

:root {
  color-scheme: light dark;

  /* color.text.* — iOS Label equivalents */
  --color-text-primary: #000000;
  --color-text-secondary: rgba(60, 60, 67, 0.6);
  --color-text-tertiary: rgba(60, 60, 67, 0.3);
  --color-text-quaternary: rgba(60, 60, 67, 0.18);

  /* color.background.* / color.surface.* */
  --color-background-app: #ffffff;
  --color-background-grouped: #f2f2f7;
  --color-surface-primary: #ffffff;
  --color-surface-elevated: rgba(255, 255, 255, 0.82);

  /* color.separator.* / color.border.* */
  --color-separator-primary: rgba(60, 60, 67, 0.29);
  --color-separator-secondary: rgba(60, 60, 67, 0.12);
  --color-border-focus: #007aff;

  /* color.tint.* — DQ-001 system accent blue */
  --color-tint-primary: #007aff;
  --color-tint-secondary: rgba(0, 122, 255, 0.12);

  /* Selection */
  --color-selection-bg: rgba(0, 122, 255, 0.22);
  --color-selection-text: inherit;

  /* Code / legal blocks */
  --color-code-bg: rgba(120, 120, 128, 0.12);
  --color-code-block-bg: rgba(120, 120, 128, 0.08);

  /* Spacing tokens (pt ≈ px at 1x) */
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-64: 64px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Borders */
  --border-hairline: 0.5px;
  --border-thin: 1px;
  --border-medium: 1.5px;

  /* Layout */
  --legal-content-max: 40.5rem; /* ~648px — readable editorial column */
  --legal-shell-max: 68rem;
  --legal-toc-width: 14.5rem;
  --legal-topbar-height: 52px;

  /* Typography — SF Pro / system, Dynamic Type–friendly clamps */
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --type-large-title-size: clamp(1.75rem, 1.4rem + 1.6vw, 2.125rem);
  --type-large-title-lh: 1.15;
  --type-title2-size: clamp(1.125rem, 1.05rem + 0.35vw, 1.25rem);
  --type-title2-lh: 1.3;
  --type-body-size: clamp(1.0625rem, 1rem + 0.2vw, 1.125rem);
  --type-body-lh: 1.55;
  --type-callout-size: 1rem;
  --type-callout-lh: 1.45;
  --type-footnote-size: 0.8125rem;
  --type-footnote-lh: 1.35;
  --type-caption-size: 0.75rem;
  --type-caption-lh: 1.3;

  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text-primary: #ffffff;
    --color-text-secondary: rgba(235, 235, 245, 0.6);
    --color-text-tertiary: rgba(235, 235, 245, 0.3);
    --color-text-quaternary: rgba(235, 235, 245, 0.18);

    --color-background-app: #000000;
    --color-background-grouped: #1c1c1e;
    --color-surface-primary: #1c1c1e;
    --color-surface-elevated: rgba(28, 28, 30, 0.86);

    --color-separator-primary: rgba(84, 84, 88, 0.65);
    --color-separator-secondary: rgba(84, 84, 88, 0.35);
    --color-border-focus: #0a84ff;

    --color-tint-primary: #0a84ff;
    --color-tint-secondary: rgba(10, 132, 255, 0.2);

    --color-selection-bg: rgba(10, 132, 255, 0.35);

    --color-code-bg: rgba(120, 120, 128, 0.24);
    --color-code-block-bg: rgba(120, 120, 128, 0.18);
  }
}

@media (prefers-contrast: more) {
  :root {
    --color-text-secondary: rgba(60, 60, 67, 0.78);
    --color-separator-primary: rgba(60, 60, 67, 0.55);
  }

  @media (prefers-color-scheme: dark) {
    :root {
      --color-text-secondary: rgba(235, 235, 245, 0.78);
      --color-separator-primary: rgba(235, 235, 245, 0.45);
    }
  }
}

/* -------------------------------------------------------------------------- */
/* Base                                                                       */
/* -------------------------------------------------------------------------- */

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

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

@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.legal-page {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font-family);
  font-size: var(--type-body-size);
  line-height: var(--type-body-lh);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  background: var(--color-background-grouped);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--color-selection-bg);
  color: var(--color-selection-text);
}

:focus {
  outline: none;
}

:focus-visible {
  outline: var(--border-medium) solid var(--color-border-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: var(--space-16);
  top: calc(var(--safe-top) + var(--space-8));
  z-index: 100;
  padding: var(--space-10) var(--space-16);
  border-radius: var(--radius-sm);
  background: var(--color-surface-primary);
  color: var(--color-tint-primary);
  font-size: var(--type-footnote-size);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-200%);
  box-shadow: 0 0 0 var(--border-hairline) var(--color-separator-primary);
}

.skip-link:focus {
  transform: translateY(0);
}

/* -------------------------------------------------------------------------- */
/* Top bar (sticky, quiet)                                                    */
/* -------------------------------------------------------------------------- */

.legal-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
  min-height: calc(var(--legal-topbar-height) + var(--safe-top));
  padding:
    calc(var(--safe-top) + var(--space-8))
    calc(var(--safe-right) + var(--space-16))
    var(--space-8)
    calc(var(--safe-left) + var(--space-16));
  background: var(--color-surface-elevated);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: var(--border-hairline) solid var(--color-separator-primary);
}

@media (prefers-reduced-transparency: reduce) {
  .legal-topbar {
    background: var(--color-surface-primary);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
}

.legal-topbar__brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-8);
  min-width: 0;
  color: var(--color-text-primary);
  text-decoration: none;
}

.legal-topbar__mark {
  font-size: var(--type-callout-size);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.legal-topbar__doc {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--type-footnote-size);
  font-weight: 400;
  color: var(--color-text-secondary);
  letter-spacing: -0.01em;
}

.legal-topbar__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-4) var(--space-12);
  margin: 0;
  padding: 0;
  list-style: none;
}

.legal-topbar__nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-4);
  color: var(--color-tint-primary);
  font-size: var(--type-footnote-size);
  font-weight: 500;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.legal-topbar__nav a[aria-current="page"] {
  color: var(--color-text-primary);
  font-weight: 600;
  pointer-events: none;
}

.legal-topbar__nav a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* -------------------------------------------------------------------------- */
/* Shell + TOC                                                                */
/* -------------------------------------------------------------------------- */

.legal-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-32);
  width: min(100%, var(--legal-shell-max));
  margin: 0 auto;
  padding:
    var(--space-24)
    calc(var(--safe-right) + var(--space-16))
    calc(var(--safe-bottom) + var(--space-64))
    calc(var(--safe-left) + var(--space-16));
}

.legal-toc {
  display: none;
}

.legal-toc[data-ready="true"] {
  display: block;
}

.legal-toc__title {
  margin: 0 0 var(--space-12);
  font-size: var(--type-caption-size);
  font-weight: 600;
  line-height: var(--type-caption-lh);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.legal-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.legal-toc__list a {
  display: block;
  padding: var(--space-8) 0;
  color: var(--color-text-secondary);
  font-size: var(--type-footnote-size);
  line-height: var(--type-footnote-lh);
  text-decoration: none;
  letter-spacing: -0.01em;
  border-left: 2px solid transparent;
  padding-left: var(--space-12);
  margin-left: calc(-1 * var(--space-12));
}

.legal-toc__list a:hover {
  color: var(--color-text-primary);
}

.legal-toc__list a[aria-current="true"] {
  color: var(--color-text-primary);
  font-weight: 600;
  border-left-color: var(--color-tint-primary);
}

@media (min-width: 960px) {
  .legal-shell {
    grid-template-columns: var(--legal-toc-width) minmax(0, var(--legal-content-max));
    justify-content: center;
    column-gap: var(--space-48);
    padding-top: var(--space-40);
  }

  .legal-toc[data-ready="true"] {
    position: sticky;
    top: calc(var(--legal-topbar-height) + var(--safe-top) + var(--space-24));
    align-self: start;
    max-height: calc(100dvh - var(--legal-topbar-height) - var(--safe-top) - var(--space-48));
    overflow: auto;
    padding-right: var(--space-8);
  }

  .legal-shell:not(:has(.legal-toc[data-ready="true"])) {
    grid-template-columns: minmax(0, var(--legal-content-max));
  }
}

/* -------------------------------------------------------------------------- */
/* Document                                                                   */
/* -------------------------------------------------------------------------- */

.legal-document {
  width: min(100%, var(--legal-content-max));
  margin: 0 auto;
  padding: var(--space-32) var(--space-24) var(--space-40);
  background: var(--color-surface-primary);
  border-radius: var(--radius-lg);
  box-shadow: 0 0 0 var(--border-hairline) var(--color-separator-secondary);
}

@media (min-width: 960px) {
  .legal-document {
    margin: 0;
    width: 100%;
  }
}

.legal-document > h1 {
  margin: 0 0 var(--space-12);
  font-size: var(--type-large-title-size);
  font-weight: 700;
  line-height: var(--type-large-title-lh);
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
}

.legal-document > .meta,
.legal-document > p.meta {
  margin: 0 0 var(--space-32);
  font-size: var(--type-footnote-size);
  line-height: var(--type-footnote-lh);
  color: var(--color-text-secondary);
  letter-spacing: -0.01em;
}

.legal-document > p {
  margin: 0 0 var(--space-16);
  max-width: 38rem;
  color: var(--color-text-primary);
}

.legal-document > p:last-child {
  margin-bottom: 0;
}

.legal-document section {
  margin: 0;
  padding: 0;
}

.legal-document h2 {
  position: relative;
  scroll-margin-top: calc(var(--legal-topbar-height) + var(--safe-top) + var(--space-24));
  margin: var(--space-40) 0 var(--space-16);
  padding-top: var(--space-24);
  border-top: var(--border-hairline) solid var(--color-separator-primary);
  font-size: var(--type-title2-size);
  font-weight: 600;
  line-height: var(--type-title2-lh);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.legal-document h2:first-of-type {
  margin-top: var(--space-32);
}

.legal-document h3 {
  scroll-margin-top: calc(var(--legal-topbar-height) + var(--safe-top) + var(--space-24));
  margin: var(--space-24) 0 var(--space-12);
  font-size: var(--type-callout-size);
  font-weight: 600;
  line-height: var(--type-callout-lh);
  letter-spacing: -0.015em;
}

.legal-document ul,
.legal-document ol {
  margin: 0 0 var(--space-16);
  padding-left: 1.25rem;
  max-width: 38rem;
}

.legal-document li {
  margin: var(--space-8) 0;
  padding-left: var(--space-4);
}

.legal-document li::marker {
  color: var(--color-text-tertiary);
}

.legal-document strong {
  font-weight: 600;
}

.legal-document a {
  color: var(--color-tint-primary);
  text-decoration: underline;
  text-decoration-thickness: from-font;
  text-underline-offset: 2px;
}

.legal-document a:hover {
  text-decoration-thickness: 1.5px;
}

.legal-document code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.35em;
  border-radius: 5px;
  background: var(--color-code-bg);
  color: var(--color-text-primary);
  word-break: break-word;
}

.legal-document pre {
  margin: 0 0 var(--space-16);
  padding: var(--space-16);
  overflow-x: auto;
  border-radius: var(--radius-md);
  background: var(--color-code-block-bg);
  border: var(--border-hairline) solid var(--color-separator-secondary);
  font-family: var(--font-mono);
  font-size: var(--type-footnote-size);
  line-height: 1.5;
}

.legal-document pre code {
  padding: 0;
  background: transparent;
}

.legal-document table {
  width: 100%;
  max-width: 38rem;
  margin: 0 0 var(--space-20);
  border-collapse: collapse;
  font-size: var(--type-footnote-size);
  line-height: var(--type-footnote-lh);
}

.legal-document th,
.legal-document td {
  padding: var(--space-10) var(--space-12);
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-hairline) solid var(--color-separator-primary);
}

.legal-document th {
  font-weight: 600;
  color: var(--color-text-secondary);
}

.legal-document blockquote {
  margin: 0 0 var(--space-16);
  padding: var(--space-12) var(--space-16);
  border-left: 3px solid var(--color-separator-primary);
  color: var(--color-text-secondary);
  max-width: 38rem;
}

/* Section heading + copy-link control */
.legal-heading {
  display: flex;
  align-items: flex-start;
  gap: var(--space-8);
}

.legal-heading__text {
  flex: 1;
  min-width: 0;
}

.legal-copy-link {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin: -10px -8px 0 0;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-tertiary);
  cursor: pointer;
  opacity: 0;
  transition: opacity 120ms ease, color 120ms ease, background-color 120ms ease;
}

.legal-heading:hover .legal-copy-link,
.legal-copy-link:focus-visible,
.legal-copy-link[data-copied="true"] {
  opacity: 1;
}

.legal-copy-link:hover {
  color: var(--color-tint-primary);
  background: var(--color-tint-secondary);
}

.legal-copy-link svg {
  width: 18px;
  height: 18px;
  pointer-events: none;
}

@media (hover: none) {
  .legal-copy-link {
    opacity: 0.55;
  }
}

.legal-footer-note {
  margin-top: var(--space-48);
  padding-top: var(--space-24);
  border-top: var(--border-hairline) solid var(--color-separator-secondary);
  font-size: var(--type-caption-size);
  line-height: var(--type-caption-lh);
  color: var(--color-text-tertiary);
}

/* -------------------------------------------------------------------------- */
/* Mobile refinements                                                         */
/* -------------------------------------------------------------------------- */

@media (max-width: 719px) {
  .legal-toc[data-ready="true"] {
    margin: 0 0 calc(-1 * var(--space-8));
    padding: var(--space-12) var(--space-16);
    background: var(--color-surface-primary);
    border-radius: var(--radius-md);
    box-shadow: 0 0 0 var(--border-hairline) var(--color-separator-secondary);
  }

  .legal-toc__list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
  }

  .legal-toc__list a {
    min-height: 44px;
    display: flex;
    align-items: center;
    margin-left: 0;
    padding-left: var(--space-12);
  }
}

@media (max-width: 479px) {
  .legal-topbar {
    flex-wrap: wrap;
    align-items: flex-start;
    row-gap: var(--space-4);
  }

  .legal-topbar__doc {
    display: none;
  }

  .legal-topbar__nav {
    width: 100%;
    justify-content: flex-start;
    gap: var(--space-4) var(--space-8);
  }

  .legal-topbar__nav a {
    min-height: 40px;
    padding: 0 var(--space-6);
  }

  .legal-document {
    padding: var(--space-24) var(--space-16) var(--space-32);
    border-radius: var(--radius-md);
  }

  .legal-shell {
    padding-top: var(--space-16);
  }
}

/* -------------------------------------------------------------------------- */
/* Print                                                                      */
/* -------------------------------------------------------------------------- */

@media print {
  :root {
    color-scheme: light;
    --color-text-primary: #000;
    --color-text-secondary: #333;
    --color-background-grouped: #fff;
    --color-surface-primary: #fff;
    --color-separator-primary: #ccc;
    --color-tint-primary: #000;
  }

  .skip-link,
  .legal-topbar,
  .legal-toc,
  .legal-copy-link {
    display: none !important;
  }

  body.legal-page {
    background: #fff;
  }

  .legal-shell {
    display: block;
    width: 100%;
    max-width: none;
    padding: 0;
  }

  .legal-document {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 0;
    box-shadow: none;
    border-radius: 0;
  }

  .legal-document a {
    color: inherit;
    text-decoration: underline;
  }

  .legal-document a[href^="http"]::after,
  .legal-document a[href^="mailto:"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: #555;
  }

  .legal-document h2 {
    break-after: avoid;
    page-break-after: avoid;
  }

  .legal-document p,
  .legal-document li {
    orphans: 3;
    widows: 3;
  }
}