/* @spec context/spec/73-address-notice-site-design.md@fd7c1c8f status: approved */
/* @spec context/spec/73-address-notice-site-design-home.md@fd7c1c8f status: approved */
/* @spec context/spec/73-address-notice-site-design-section.md@fd7c1c8f status: approved */
/* @spec context/spec/73-address-notice-site-design-article.md@fd7c1c8f status: approved */
/* @spec context/spec/73-address-notice-site-design-not-found.md@fd7c1c8f status: approved */
/* notice-site stylesheet: one first-party file, system fonts only, no external assets (spec 73 AN-17, AN-19).
   Colour, size, spacing, radius and shadow values live only in the two token blocks below (AND-13). */
:root {
  --color-bg: #f2f4f6;
  --color-surface: #ffffff;
  --color-surface-weak: #f2f4f6;
  --color-surface-weak-hover: #e5e8eb;
  --color-text: #191f28;
  --color-text-muted: #4e5968;
  --color-border: #e5e8eb;
  --color-accent: #0f766e;
  --color-accent-hover: #115e59;
  --color-accent-text: #ffffff;
  --color-focus: #0f766e;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Noto Sans KR', 'Malgun Gothic', sans-serif;
  --t1: 700 28px / 1.35 var(--font-sans);
  --t2: 700 22px / 1.4 var(--font-sans);
  --t3: 600 19px / 1.45 var(--font-sans);
  --t4: 400 17px / 1.6 var(--font-sans);
  --t-row: 600 17px / 1.5 var(--font-sans);
  --t5: 500 15px / 1.5 var(--font-sans);
  --t6: 400 13px / 1.5 var(--font-sans);

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

  --radius-card: 20px;
  --radius-button: 12px;
  --shadow-card: 0 1px 3px rgba(25, 31, 40, 0.06);
  --size-action: 56px;
  --size-tap: 44px;
  --border-width: 1px;
  --focus-ring: 3px solid var(--color-focus);
  --focus-offset: 2px;
  --content-max: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #101013;
    --color-surface: #202027;
    --color-surface-weak: #2c2c35;
    --color-surface-weak-hover: #3c3c47;
    --color-text: #f2f4f6;
    --color-text-muted: #a3a9b3;
    --color-border: #3c3c47;
    --color-accent: #2dd4bf;
    --color-accent-hover: #5eead4;
    --color-accent-text: #042f2e;
    --color-focus: #5eead4;
    --shadow-card: none;
  }

  /* AND-37: the dark card edge, the one selector rule of this block. */
  .card {
    border: var(--border-width) solid var(--color-border);
  }
}

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font: var(--t4);
  word-break: keep-all;
  overflow-wrap: anywhere;
}

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

h1 {
  font: var(--t1);
}

h2 {
  font: var(--t2);
}

h3 {
  font: var(--t3);
}

/* Links and focus (AND-21, AND-22) */
a {
  color: var(--color-accent);
  text-decoration: underline;
  transition:
    color 150ms,
    background-color 150ms;
}

a:hover,
a:active {
  color: var(--color-accent-hover);
}

a:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

/* Shell: header (AND-8, ANDH-2..4) */
.site-header {
  background: var(--color-surface);
  border-bottom: var(--border-width) solid var(--color-border);
}

.site-header-inner,
.site-main,
.site-footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.site-header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  column-gap: var(--space-4);
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.site-name {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--size-tap);
  font: var(--t3);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.site-name:hover,
.site-name:active {
  color: var(--color-text);
}

.site-mark {
  display: block;
  width: var(--space-6);
  height: var(--space-6);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: var(--size-tap);
  padding: 0 var(--space-2);
  font: var(--t5);
  color: var(--color-text-muted);
  text-decoration: none;
}

.site-nav a:first-child {
  padding-left: 0;
}

.site-nav a:hover,
.site-nav a:active {
  color: var(--color-text);
}

.site-nav a[aria-current='page'] {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: calc(var(--border-width) * 2);
  text-underline-offset: var(--space-1);
}

/* Shell: main and footer (ANDH-5, ANDH-17) */
.site-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-top: var(--space-4);
}

.site-footer {
  margin-top: var(--space-10);
  border-top: var(--border-width) solid var(--color-border);
}

.site-footer-inner {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.site-footer-name {
  font: var(--t6);
  color: var(--color-text-muted);
}

/* Card base (AND-37) */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
}

/* Buttons (AND-22, AND-25, ANDH-8, ANDH-9, ANDH-11, ANDN-5) */
.button {
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-button);
  text-align: center;
  text-decoration: none;
}

.button-companion {
  min-height: var(--size-tap);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-weak);
  color: var(--color-text);
  font: var(--t5);
}

.button-companion:hover,
.button-companion:active {
  background: var(--color-surface-weak-hover);
  color: var(--color-text);
}

.button-primary {
  flex-direction: column;
  gap: var(--space-1);
  width: 100%;
  min-height: var(--size-action);
  padding: var(--space-3) var(--space-4);
  background: var(--color-accent);
  color: var(--color-accent-text);
  font: var(--t3);
}

.button-primary:hover,
.button-primary:active {
  background: var(--color-accent-hover);
  color: var(--color-accent-text);
}

.button-label {
  font: var(--t3);
}

.button-domain {
  font: var(--t5);
  color: var(--color-accent-text);
  overflow-wrap: anywhere;
}

/* Home: notice card (ANDH-7, ANDH-8, ANDH-10) */
.notice-heading {
  font: var(--t1);
  color: var(--color-text);
}

.notice-line {
  margin-top: var(--space-1);
  font: var(--t4);
  color: var(--color-text-muted);
}

.notice-action {
  margin: var(--space-5) 0 0;
}

.companion-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
}

.companion-links li {
  display: flex;
}

.companion-links .button-companion {
  flex: 1;
}

/* Home: about card (ANDH-12) */
.site-about-line {
  font: var(--t5);
  color: var(--color-text-muted);
}

.site-about-line + .site-about-line {
  margin-top: var(--space-1);
}

/* Home: section cards (ANDH-13, ANDH-14) */
.home-sections {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
}

.home-section-title {
  margin: 0 0 var(--space-2);
  font: var(--t2);
}

.home-section-title a {
  color: var(--color-text);
  text-decoration: none;
}

.home-section-title a:hover,
.home-section-title a:active {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* Section: heading block on the grey background (ANDS-1..3) */
.page-head {
  margin: var(--space-8) 0 var(--space-4);
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

.page-head h1 {
  font: var(--t1);
  color: var(--color-text);
}

.page-lead {
  margin-top: var(--space-2);
  font: var(--t5);
  color: var(--color-text-muted);
}

/* Page rows: the one row form of the section screen and the home section cards (ANDS-5..9, ANDS-14, ANDH-15, ANDH-16) */
.page-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-row {
  display: block;
  min-height: var(--size-tap);
  padding: var(--space-3);
  border-radius: var(--radius-button);
  color: var(--color-text);
  text-decoration: none;
}

.page-row:hover,
.page-row:active {
  background: var(--color-surface-weak);
  color: var(--color-text);
}

.page-title {
  display: block;
  font: var(--t-row);
  color: var(--color-text);
}

.page-desc {
  display: block;
  margin-top: var(--space-1);
  font: var(--t5);
  color: var(--color-text-muted);
}

.page-date {
  font: var(--t6);
  color: var(--color-text-muted);
}

/* Row date line (ANDS-7) */
.page-row .page-date {
  display: block;
  margin-top: var(--space-1);
}

/* Article: card head (ANDA-5..7) */
.article-section {
  display: inline-flex;
  align-items: center;
  min-height: var(--size-tap);
  margin-bottom: var(--space-1);
  font: var(--t5);
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
}

.article-section:hover,
.article-section:active {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.article-title {
  margin: 0;
  font: var(--t1);
  color: var(--color-text);
}

/* Article date line (ANDA-7) */
.article-card .page-date {
  margin: var(--space-2) 0 0;
}

/* Article body typography (ANDA-8) */
.article-body {
  margin-top: var(--space-8);
  font: var(--t4);
  color: var(--color-text);
}

.article-body h2 {
  margin: var(--space-10) 0 var(--space-3);
  font: var(--t2);
}

.article-body h3 {
  margin: var(--space-8) 0 var(--space-2);
  font: var(--t3);
}

.article-body h2:first-child,
.article-body h3:first-child {
  margin-top: 0;
}

.article-body p,
.article-body ul,
.article-body ol,
.article-body blockquote {
  margin: 0 0 var(--space-4);
}

.article-body ul,
.article-body ol {
  padding-left: var(--space-6);
}

.article-body li {
  margin-bottom: var(--space-2);
}

.article-body li:last-child {
  margin-bottom: 0;
}

.article-body li > p {
  margin: 0;
}

.article-body blockquote {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-button);
  background: var(--color-surface-weak);
  color: var(--color-text);
}

.article-body blockquote p:last-child,
.article-body > :last-child {
  margin-bottom: 0;
}

.article-body strong {
  font-weight: 700;
  color: var(--color-text);
}

.article-body em {
  font-style: italic;
}

.article-body code {
  padding: 0 var(--space-1);
  background: var(--color-surface-weak);
  font-family: var(--font-sans);
  font-size: inherit;
}

.article-body a {
  color: var(--color-accent);
  text-decoration: underline;
}

.article-body a:hover,
.article-body a:active {
  color: var(--color-accent-hover);
}

/* Article: back row (ANDA-9, ANDA-10) */
.back-row {
  margin: 0;
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--size-tap);
  font: var(--t5);
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: underline;
}

.back-link:hover,
.back-link:active {
  color: var(--color-accent-hover);
}

/* Not-found: message card (ANDN-5..7) */
.not-found {
  text-align: center;
}

.not-found-title {
  margin: 0 0 var(--space-2);
  font: var(--t1);
  color: var(--color-text);
}

.not-found-line {
  margin: 0 0 var(--space-6);
  font: var(--t4);
  color: var(--color-text-muted);
}

.not-found-action {
  margin: 0;
}

/* Wide layout (AND-20) */
@media (min-width: 720px) {
  .site-header-inner,
  .site-main,
  .site-footer-inner {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  .site-nav a:first-child {
    padding-left: var(--space-2);
  }

  .card {
    padding: var(--space-6);
  }

  .page-head,
  .back-row {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  .companion-links {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
  }

  .home-sections {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

/* Motion (AND-22) */
@media (prefers-reduced-motion: reduce) {
  a {
    transition: none;
  }
}