/* ============================================================
   ArticleRiot — Base Styles
   All CSS variables, typography, reset, and global elements.
   Every page imports this file.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=Source+Serif+4:ital,wght@0,400;0,600;1,400&family=DM+Mono:wght@400&display=swap');

/* ============================================================
   CSS Variables — Light Mode
   ============================================================ */

:root {
  /* Colour */
  --color-bg:           #FAFAF8;
  --color-surface:      #F0EFEB;
  --color-border:       #D4D2CB;
  --color-ink-light:    #6B6963;
  --color-ink:          #2E2D2A;
  --color-ink-dark:     #111110;
  --color-accent:       #C1440E;
  --color-accent-dark:  #9E3509;

  /* Typography */
  --font-display:  'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body:     'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-mono:     'DM Mono', 'Courier New', monospace;

  /* Type scale */
  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-lg:    1.125rem;
  --text-xl:    1.25rem;
  --text-2xl:   1.75rem;
  --text-3xl:   2.5rem;
  --text-4xl:   3rem;

  /* Line heights */
  --leading-tight:  1.2;
  --leading-snug:   1.4;
  --leading-normal: 1.6;
  --leading-loose:  1.75;

  /* Spacing (8px grid) */
  --space-1:    8px;
  --space-2:   16px;
  --space-3:   24px;
  --space-4:   32px;
  --space-5:   48px;
  --space-6:   64px;
  --space-7:   96px;
  --space-8:  128px;

  /* Layout */
  --max-width-content:  720px;
  --max-width-site:    1200px;

  /* Borders */
  --radius:       4px;
  --border:       1px solid var(--color-border);

  /* Transitions */
  --transition:   200ms ease;

  /* Shadows */
  --shadow-card:  0 1px 3px rgba(0, 0, 0, 0.07);
  --shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.1);

  color-scheme: light dark;
}

/* ============================================================
   Dark Mode — system preference
   ============================================================ */

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg:           #141412;
    --color-surface:      #1E1D1B;
    --color-border:       #2E2D2A;
    --color-ink-light:    #8A8880;
    --color-ink:          #C8C6C0;
    --color-ink-dark:     #EDECEA;
    --color-accent:       #E05520;
    --color-accent-dark:  #C1440E;
    --shadow-card:        0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-hover:       0 2px 8px rgba(0, 0, 0, 0.4);
  }
}

/* Dark mode — manual toggle */
[data-theme="dark"] {
  --color-bg:           #141412;
  --color-surface:      #1E1D1B;
  --color-border:       #2E2D2A;
  --color-ink-light:    #8A8880;
  --color-ink:          #C8C6C0;
  --color-ink-dark:     #EDECEA;
  --color-accent:       #E05520;
  --color-accent-dark:  #C1440E;
  --shadow-card:        0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-hover:       0 2px 8px rgba(0, 0, 0, 0.4);
}

/* Light mode — manual toggle override */
[data-theme="light"] {
  --color-bg:           #FAFAF8;
  --color-surface:      #F0EFEB;
  --color-border:       #D4D2CB;
  --color-ink-light:    #6B6963;
  --color-ink:          #2E2D2A;
  --color-ink-dark:     #111110;
  --color-accent:       #C1440E;
  --color-accent-dark:  #9E3509;
  --shadow-card:        0 1px 3px rgba(0, 0, 0, 0.07);
  --shadow-hover:       0 2px 8px rgba(0, 0, 0, 0.1);
}


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

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  line-height: var(--leading-loose);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 200ms ease, color 200ms ease;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}


/* ============================================================
   Typography — Global
   ============================================================ */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-ink-dark);
  line-height: var(--leading-tight);
  font-weight: 400;
}

h1 { font-size: var(--text-3xl); font-weight: 700; }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }

p {
  font-family: var(--font-body);
  color: var(--color-ink);
  line-height: var(--leading-loose);
}

strong { font-weight: 600; color: var(--color-ink-dark); }
em     { font-style: italic; }

small {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
}


/* ============================================================
   Layout Utilities
   ============================================================ */

.site-wrapper {
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.content-wrapper {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}


/* ============================================================
   Navigation
   ============================================================ */

.site-nav {
  border-bottom: var(--border);
  background-color: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 200ms ease, border-color 200ms ease;
}

.site-nav__inner {
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-nav__logo img,
.site-nav__logo svg {
  height: 28px;
  width: auto;
}

/* Dark mode logo swap */
.logo-light { display: block; }
.logo-dark  { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo-light { display: none; }
  :root:not([data-theme="light"]) .logo-dark  { display: block; }
}

[data-theme="dark"] .logo-light { display: none; }
[data-theme="dark"] .logo-dark  { display: block; }
[data-theme="light"] .logo-light { display: block; }
[data-theme="light"] .logo-dark  { display: none; }

.site-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav__search-btn,
.site-nav__theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  color: var(--color-ink-light);
  transition: color var(--transition);
  background: none;
  border: none;
  cursor: pointer;
}

.site-nav__search-btn:hover,
.site-nav__theme-btn:hover {
  color: var(--color-ink-dark);
}

.site-nav__search-btn svg,
.site-nav__theme-btn svg {
  width: 18px;
  height: 18px;
}

/* Theme toggle icons */
.icon-sun  { display: none; }
.icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun  { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}

[data-theme="dark"] .icon-sun  { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }


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

.site-footer {
  border-top: var(--border);
  margin-top: var(--space-8);
  padding: var(--space-5) 0;
}

.site-footer__inner {
  max-width: var(--max-width-site);
  margin: 0 auto;
  padding: 0 var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-footer__copy {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
}

.site-footer__links {
  display: flex;
  gap: var(--space-3);
}

.site-footer__links a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
  transition: color var(--transition);
}

.site-footer__links a:hover {
  color: var(--color-ink);
}


/* ============================================================
   Article Card
   ============================================================ */

.article-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: box-shadow var(--transition), background-color 200ms ease;
  text-decoration: none;
}

.article-card:hover {
  box-shadow: var(--shadow-hover);
}

.article-card__category {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.article-card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink-dark);
  line-height: var(--leading-snug);
  transition: color var(--transition);
}

.article-card:hover .article-card__title {
  color: var(--color-accent);
}

.article-card__excerpt {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-ink);
  line-height: var(--leading-normal);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-1);
}

.article-card__author,
.article-card__readtime {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
}

.article-card__meta-sep {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-border);
}


/* ============================================================
   Article Grid
   ============================================================ */

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .article-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .article-grid { grid-template-columns: 1fr; }
}


/* ============================================================
   Article Body (rendered Markdown)
   ============================================================ */

.article-body {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  line-height: var(--leading-loose);
  color: var(--color-ink);
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.article-body h2 {
  font-size: var(--text-2xl);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.article-body h3 {
  font-size: var(--text-xl);
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.article-body p { margin-bottom: var(--space-3); }

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

.article-body a:hover { text-decoration: underline; }

.article-body strong {
  font-weight: 600;
  color: var(--color-ink-dark);
}

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

.article-body ul,
.article-body ol {
  margin: var(--space-3) 0;
  padding-left: var(--space-4);
}

.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }

.article-body li {
  margin-bottom: var(--space-1);
  line-height: var(--leading-loose);
}

.article-body blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: var(--space-3);
  margin: var(--space-4) 0;
  color: var(--color-ink-light);
  font-style: italic;
}

.article-body h2:last-of-type {
  font-size: var(--text-xl);
  color: var(--color-ink-light);
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: var(--border);
}

.article-body h2:last-of-type ~ ol,
.article-body h2:last-of-type ~ p {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
  line-height: var(--leading-snug);
}


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

.article-header {
  max-width: var(--max-width-content);
  margin: var(--space-7) auto var(--space-5);
}

.article-header__category {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-2);
  display: block;
  transition: color var(--transition);
}

.article-header__category:hover { color: var(--color-accent); }

.article-header__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-ink-dark);
  line-height: 1.15;
  margin-bottom: var(--space-4);
}

.article-header__byline {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-bottom: var(--space-4);
  border-bottom: var(--border);
}

.article-header__author,
.article-header__date,
.article-header__readtime {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
}

.article-header__sep {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-border);
}

@media (max-width: 560px) {
  .article-header__title { font-size: var(--text-3xl); }
}


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

.page-header {
  padding: var(--space-6) 0 var(--space-5);
  border-bottom: var(--border);
  margin-bottom: var(--space-5);
}

.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-ink-dark);
}

.page-header__subtitle {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-light);
  margin-top: var(--space-1);
}


/* ============================================================
   Search
   ============================================================ */

.search-bar {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  max-width: 480px;
  margin: var(--space-5) 0;
}

.search-bar__input {
  flex: 1;
  border: var(--border);
  border-radius: var(--radius);
  padding: var(--space-1) var(--space-2);
  background: var(--color-bg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-ink-dark);
  outline: none;
  transition: border-color var(--transition), background-color 200ms ease;
}

.search-bar__input:focus { border-color: var(--color-ink-light); }
.search-bar__input::placeholder { color: var(--color-ink-light); }

.search-bar__btn {
  padding: var(--space-1) var(--space-3);
  background: var(--color-ink-dark);
  color: var(--color-bg);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  transition: background var(--transition);
}

.search-bar__btn:hover { background: var(--color-accent); }


/* ============================================================
   Pagination
   ============================================================ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: var(--border);
}

.pagination__btn {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-light);
  padding: var(--space-1) var(--space-2);
  border: var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.pagination__btn:hover {
  color: var(--color-ink-dark);
  border-color: var(--color-ink-light);
}

.pagination__btn--active {
  color: var(--color-ink-dark);
  border-color: var(--color-ink-dark);
}


/* ============================================================
   Author Blurb
   ============================================================ */

.author-blurb {
  max-width: var(--max-width-content);
  margin: var(--space-6) auto 0;
  padding-top: var(--space-5);
  border-top: var(--border);
}

.author-blurb__name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-ink-dark);
  margin-bottom: var(--space-1);
}

.author-blurb__bio {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-ink-light);
  line-height: var(--leading-normal);
}


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

@media (max-width: 768px) {
  .site-wrapper { padding: 0 var(--space-3); }
  .site-footer__inner { flex-direction: column; align-items: flex-start; }
}


/* ============================================================
   Dark mode theme toggle script (inline in head)
   ============================================================ */

/* Prevents flash of wrong theme on load —
   the nav.html script sets data-theme before paint */
html { visibility: visible; }

/* ============================================================
   Logo and icon defaults (must be explicit)
   ============================================================ */

.logo-light { display: block; }
.logo-dark  { display: none; }
.icon-sun   { display: none; }
.icon-moon  { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo-light { display: none; }
  :root:not([data-theme="light"]) .logo-dark  { display: block; }
  :root:not([data-theme="light"]) .icon-sun   { display: block; }
  :root:not([data-theme="light"]) .icon-moon  { display: none; }
}

[data-theme="dark"] .logo-light { display: none; }
[data-theme="dark"] .logo-dark  { display: block; }
[data-theme="dark"] .icon-sun   { display: block; }
[data-theme="dark"] .icon-moon  { display: none; }

[data-theme="light"] .logo-light { display: block; }
[data-theme="light"] .logo-dark  { display: none; }
[data-theme="light"] .icon-sun   { display: none; }
[data-theme="light"] .icon-moon  { display: block; }