/* ==========================================================================
   AI Daily — Editorial AI News
   Design: Refined editorial magazine aesthetic
   ========================================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Typography */
  --font-serif: 'Newsreader', 'Georgia', serif;
  --font-sans: 'DM Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Light theme (default) */
  --bg-primary: #FAFAF8;
  --bg-secondary: #F2F1EE;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F7F6F4;
  --bg-nav: rgba(250, 250, 248, 0.85);
  --bg-tag: #EDECEA;
  --bg-tag-hover: #E0DFDB;

  --text-primary: #1A1A18;
  --text-secondary: #5C5C58;
  --text-tertiary: #8A8A85;
  --text-inverse: #FAFAF8;
  --text-link: #1A1A18;

  --border-primary: #E0DFDB;
  --border-secondary: #EBEBE8;
  --accent: #2D2D2A;
  --accent-warm: #C4553A;
  --accent-warm-bg: rgba(196, 85, 58, 0.08);

  /* Sizing */
  --max-width: 1200px;
  --nav-height: 64px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
}

/* ---------- Dark Theme ---------- */
[data-theme="dark"] {
  --bg-primary: #0D0D0C;
  --bg-secondary: #161615;
  --bg-card: #1A1A19;
  --bg-card-hover: #222221;
  --bg-nav: rgba(13, 13, 12, 0.92);
  --bg-tag: #252524;
  --bg-tag-hover: #30302F;

  --text-primary: #E8E8E4;
  --text-secondary: #9A9A95;
  --text-tertiary: #63635F;
  --text-inverse: #0D0D0C;
  --text-link: #E8E8E4;

  --border-primary: #282826;
  --border-secondary: #1E1E1D;
  --accent: #E8E8E4;
  --accent-warm: #E07858;
  --accent-warm-bg: rgba(224, 120, 88, 0.12);

  /* Dark-only overrides */
  --noise-opacity: 0.018;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.03);
  --shadow-nav: 0 1px 0 rgba(255,255,255,0.04);
}

/* Dark mode noise texture */
[data-theme="dark"] body::before {
  opacity: var(--noise-opacity, 0.018);
}

/* Dark mode selection */
[data-theme="dark"] ::selection {
  background: rgba(224, 120, 88, 0.25);
  color: #E8E8E4;
}

/* Dark mode scrollbar */
[data-theme="dark"] ::-webkit-scrollbar {
  width: 6px;
}
[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 3px;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* Dark mode card shadows */
[data-theme="dark"] .article-card {
  border-bottom-color: var(--border-primary);
}
[data-theme="dark"] .article-card:hover {
  opacity: 1;
}
[data-theme="dark"] .article-card:hover .article-card__title {
  color: var(--accent-warm);
}

/* Dark mode nav shadow */
[data-theme="dark"] .nav {
  border-bottom-color: rgba(255,255,255,0.05);
}

/* Dark mode code blocks */
[data-theme="dark"] .article-content code {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.06);
}
[data-theme="dark"] .article-content pre {
  background: #111110;
  border-color: var(--border-primary);
}

/* Dark mode blockquote */
[data-theme="dark"] .article-content blockquote {
  border-left-color: var(--accent-warm);
  background: var(--bg-secondary);
}

/* Dark mode table */
[data-theme="dark"] .article-content table {
  border-color: var(--border-primary);
}
[data-theme="dark"] .article-content th {
  background: var(--bg-secondary);
  color: var(--text-primary);
}
[data-theme="dark"] .article-content td {
  border-color: var(--border-primary);
  color: var(--text-secondary);
}

/* Dark mode link underline */
[data-theme="dark"] .article-content a {
  text-decoration-color: rgba(224, 120, 88, 0.3);
}
[data-theme="dark"] .article-content a:hover {
  text-decoration-color: var(--accent-warm);
}

/* Dark mode divider */
[data-theme="dark"] .divider {
  background: var(--border-primary);
}
[data-theme="dark"] hr {
  background: var(--border-primary);
}

/* Dark mode theme toggle button */
[data-theme="dark"] .theme-toggle {
  background: rgba(255,255,255,0.06);
}
[data-theme="dark"] .theme-toggle:hover {
  background: rgba(255,255,255,0.1);
}
[data-theme="dark"] .theme-toggle svg {
  stroke: var(--accent-warm);
}

/* Transition all elements on theme switch */
.theme-toggle,
.article-card,
.nav,
.hero__title,
.hero__subtitle,
.article-content,
.about-content,
.footer,
.divider {
  transition: background-color var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out);
  overflow-x: hidden;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* ---------- Focus Visible ---------- */
:focus-visible {
  outline: 2px solid var(--accent-warm);
  outline-offset: 2px;
}

/* Skip to content link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--accent-warm);
  color: var(--text-inverse);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  z-index: 200;
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: var(--space-sm);
}

/* ---------- Noise Texture Overlay ---------- */
body::before {
  content: '';
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  pointer-events: none;
  z-index: -1;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-nav);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-secondary);
  z-index: 100;
  transition: background-color var(--duration-normal) var(--ease-out);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.nav__logo-dot {
  width: 7px;
  height: 7px;
  background: var(--accent-warm);
  border-radius: 50%;
  display: inline-block;
  position: relative;
  top: -2px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav__link:hover,
.nav__link--active {
  color: var(--text-primary);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--accent-warm);
  border-radius: 1px;
}

/* Theme Toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tag);
  transition: background var(--duration-fast) var(--ease-out);
}

.theme-toggle:hover {
  background: var(--bg-tag-hover);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
  stroke: var(--text-secondary);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke var(--duration-fast) var(--ease-out);
}

.theme-toggle:hover svg {
  stroke: var(--text-primary);
}

/* Mobile Nav Toggle */
.nav__mobile-toggle {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  background: var(--bg-tag);
}

.nav__mobile-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--text-secondary);
  position: relative;
  transition: background var(--duration-fast) var(--ease-out);
}

.nav__mobile-toggle span::before,
.nav__mobile-toggle span::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: inherit;
  left: 0;
  transition: transform var(--duration-normal) var(--ease-out);
}

.nav__mobile-toggle span::before { top: -5px; }
.nav__mobile-toggle span::after { top: 5px; }

.nav__mobile-toggle.active span {
  background: transparent;
}

.nav__mobile-toggle.active span::before {
  transform: rotate(45deg);
  top: 0;
  background: var(--text-primary);
}

.nav__mobile-toggle.active span::after {
  transform: rotate(-45deg);
  top: 0;
  background: var(--text-primary);
}

/* ---------- Hero ---------- */
.hero {
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-2xl);
  position: relative;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-warm);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero__eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--accent-warm);
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  max-width: 720px;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 520px;
  font-weight: 400;
}

.hero__date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xl);
  letter-spacing: 0.05em;
}

/* ---------- Divider ---------- */
.divider {
  border: none;
  height: 1px;
  background: var(--border-primary);
  margin: var(--space-lg) 0;
}

/* ---------- Article List ---------- */
.articles {
  padding-bottom: var(--space-3xl);
}

.article-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xl);
  align-items: start;
  padding: var(--space-xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--border-secondary);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: background-color var(--duration-fast) var(--ease-out);
}

.article-card:last-child {
  border-bottom: none;
}

.article-card__left {
  min-width: 0;
}

.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.article-card__date {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.article-card__tag {
  display: none;
}

.article-card__title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  transition: color var(--duration-fast) var(--ease-out);
}

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

.article-card__excerpt {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-md);
}

.article-card__read-more {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--duration-fast) var(--ease-out);
}

.article-card:hover .article-card__read-more {
  color: var(--accent-warm);
}

.article-card__read-more::after {
  content: '\2192';
  transition: transform var(--duration-fast) var(--ease-out);
}

.article-card:hover .article-card__read-more {
  color: var(--accent-warm);
}

.article-card:hover .article-card__read-more::after {
  transform: translateX(3px);
}

.article-card__number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--border-primary);
  line-height: 1;
  min-width: 50px;
  text-align: right;
  padding-top: 6px;
  transition: color var(--duration-fast) var(--ease-out);
}

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

/* ---------- Article Detail Page ---------- */
.article-page {
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
}

.article-page__header {
  max-width: 680px;
  margin: 0 auto var(--space-3xl);
}

.article-page__back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-xl);
  transition: color var(--duration-fast) var(--ease-out);
}

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

.article-page__back::before {
  content: '\2190';
}

.article-page__tag {
  display: none;
}

.article-page__title {
  font-family: var(--font-serif);
  font-size: clamp(1.65rem, 3.2vw, 2.2rem);
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  max-width: 620px;
}

.article-page__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

.article-page__meta-separator {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

/* Article Content */
.article-content {
  max-width: 680px;
  margin: 0 auto;
  font-family: var(--font-serif);
}

.article-content h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.article-content h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.005em;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.article-content p {
  font-size: 1.1rem;
  line-height: 1.85;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.article-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

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

.article-content blockquote {
  border-left: 2px solid var(--accent-warm);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-xl) 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-style: normal;
  line-height: 1.7;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-content blockquote p {
  margin-bottom: 0;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

.article-content blockquote a {
  color: var(--accent-warm);
  text-decoration: none;
  border-bottom: 1px solid rgba(196, 85, 58, 0.3);
  transition: border-color var(--duration-fast) var(--ease-out);
}

.article-content blockquote a:hover {
  border-bottom-color: var(--accent-warm);
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-lg);
  padding-left: 1.4em;
}

.article-content li {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 6px;
  list-style: disc;
}

.article-content ol li {
  list-style: decimal;
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--bg-tag);
  padding: 2px 7px;
  border-radius: 4px;
  color: var(--accent-warm);
}

.article-content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
}

.article-content pre code {
  background: none;
  padding: 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-primary);
}

.article-content a {
  color: var(--accent-warm);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(196, 85, 58, 0.25);
  text-decoration-thickness: 1px;
  transition: text-decoration-color var(--duration-fast) var(--ease-out);
}

.article-content a:hover {
  text-decoration-color: var(--accent-warm);
}

.article-content hr {
  border: none;
  height: 1px;
  background: var(--border-primary);
  margin: var(--space-2xl) 0;
}

/* Article tables */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: 0.9rem;
}
.article-content th,
.article-content td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-secondary);
}
.article-content th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  background: var(--bg-secondary);
}
.article-content td {
  color: var(--text-secondary);
}
.article-content tr:last-child td {
  border-bottom: none;
}

/* ---------- Article End Mark ---------- */
.end-mark {
  text-align: center;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--text-tertiary);
  margin: var(--space-2xl) 0 var(--space-md);
}

.end-mark-sub {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

/* ---------- About Page ---------- */
.about-page {
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
}

.about-page__header {
  max-width: 680px;
  margin: 0 auto var(--space-2xl);
}

.about-page__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.about-page__subtitle {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 520px;
}

.about-content {
  max-width: 680px;
  margin: 0 auto;
}

.about-content p {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.about-content h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.about-content ul {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-lg);
}

.about-content li {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  list-style: disc;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border-primary);
  padding: var(--space-xl) 0;
  margin-top: var(--space-2xl);
}

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

.footer__copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

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

.footer__link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__link:hover {
  color: var(--text-primary);
}

/* ---------- Empty State ---------- */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
}

.empty-state__icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
  opacity: 0.3;
}

.empty-state__title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.empty-state__desc {
  font-size: 0.9rem;
  color: var(--text-tertiary);
}

/* ---------- Skeleton Loading ---------- */
.skeleton-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xl);
  align-items: start;
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--border-secondary);
}

.skeleton-card__left {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.skeleton-card__num {
  width: 50px;
  height: 40px;
  background: var(--bg-tag);
  border-radius: var(--radius-sm);
  animation: skeletonPulse 1.5s ease-in-out infinite;
}

.skeleton-line {
  height: 14px;
  background: var(--bg-tag);
  border-radius: 4px;
  animation: skeletonPulse 1.5s ease-in-out infinite;
}

.skeleton-line--sm { width: 35%; }
.skeleton-line--md { width: 80%; }
.skeleton-line--lg { width: 90%; height: 20px; }
.skeleton-line--cta { width: 25%; margin-top: 4px; }

@keyframes skeletonPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

/* ---------- Page Transitions ---------- */
.hero {
  animation: heroFadeIn 600ms var(--ease-out) both;
}

@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-enter {
  animation: pageEnter var(--duration-slow) var(--ease-out) both;
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Staggered article entrance — cards start visible, animate with slight offset */
.article-card {
  opacity: 0;
  animation: cardEnter 500ms var(--ease-out) both;
}

.article-card:nth-child(1) { animation-delay: 80ms; }
.article-card:nth-child(2) { animation-delay: 140ms; }
.article-card:nth-child(3) { animation-delay: 200ms; }
.article-card:nth-child(4) { animation-delay: 260ms; }
.article-card:nth-child(5) { animation-delay: 320ms; }

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root {
    --space-xl: 28px;
    --space-2xl: 48px;
    --space-3xl: 64px;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out);
    z-index: 99;
  }

  .nav__links.open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: 1.25rem;
    font-family: var(--font-serif);
    font-weight: 400;
  }

  .nav__mobile-toggle {
    display: flex;
  }

  .article-card {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .article-card__number {
    display: none;
  }

  .hero__title {
    font-size: clamp(2rem, 7vw, 3rem);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .nav__inner {
    padding: 0 var(--space-md);
  }

  .footer__inner {
    padding: 0 var(--space-md);
    flex-direction: column;
    text-align: center;
  }

}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ---------- Selection ---------- */
::selection {
  background: var(--accent-warm);
  color: var(--text-inverse);
}

/* ---------- Print ---------- */
@media print {
  .nav, .footer, .theme-toggle {
    display: none !important;
  }

  body::before {
    display: none;
  }

  .article-page {
    padding-top: 0;
  }
}