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

:root {
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR',
    'PingFang SC', 'Hiragino Sans', 'Meiryo', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;

  --color-bg: #f8f7f4;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #8a8a8a;
  --color-accent: #d35233;
  --color-accent-soft: #fff0ec;
  --color-border: #e8e6e1;
  --color-border-light: #f2f1ed;
  --color-tag-bg: #f0eeea;
  --color-tag-text: #555;
  --color-hero-bg: #1c2432;
  --color-hero-text: #f8f7f4;
  --color-eli5-bg: #fefcf3;
  --color-eli5-border: #ede4c4;
  --color-eli5-accent: #e6a817;

  --max-width: 1080px;
  --content-width: 720px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.05);
}

/* === Dark Mode === */
[data-theme="dark"] {
  --color-bg: #1a1a1e;
  --color-surface: #242428;
  --color-text: #e8e6e1;
  --color-text-secondary: #b0ada6;
  --color-text-muted: #7a776f;
  --color-accent: #e06b50;
  --color-accent-soft: #3a2520;
  --color-border: #3a3a3e;
  --color-border-light: #2e2e32;
  --color-tag-bg: #2e2e32;
  --color-tag-text: #b0ada6;
  --color-hero-bg: #111318;
  --color-hero-text: #e8e6e1;
  --color-eli5-bg: #2a2720;
  --color-eli5-border: #4a4230;
  --color-eli5-accent: #e6a817;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25), 0 2px 4px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.35), 0 4px 8px rgba(0, 0, 0, 0.2);

  color-scheme: dark;
}

html {
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

/* Fallback: hide KaTeX MathML even if CDN CSS fails to load */
.katex-mathml {
  display: none;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.main {
  flex: 1 0 auto;
}

.footer {
  flex-shrink: 0;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Navigation === */
.nav {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.nav-logo {
  font-family: var(--font-sans);
  font-size: 1.3rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.03em;
}

.nav-logo:hover {
  text-decoration: none;
}

.nav-logo-gist {
  color: var(--color-text);
}

.nav-logo-dot {
  color: var(--color-accent);
  font-weight: 700;
}

.nav-logo-science {
  color: var(--color-text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links > a {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.nav-links > a:hover {
  color: var(--color-text);
  text-decoration: none;
  border-bottom-color: var(--color-accent);
}

.nav-bottom-row {
  display: contents;
}

/* Language dropdown */
.lang-dropdown {
  position: relative;
  margin-left: 0.5rem;
}

.lang-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  font-family: inherit;
}

.lang-dropdown-toggle:hover {
  background: var(--color-tag-bg);
  color: var(--color-text);
}

.lang-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 100%;
  list-style: none;
  margin: 0;
  padding: 0.25rem 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  z-index: 100;
}

.lang-dropdown-menu.lang-dropdown-open {
  display: block;
}

.lang-dropdown-item {
  padding: 0.35rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.lang-dropdown-item:hover {
  background: var(--color-tag-bg);
  color: var(--color-text);
}

.lang-dropdown-item-active {
  color: var(--color-text);
  font-weight: 600;
}

/* === Main === */
.main {
  padding-top: 2rem;
  padding-bottom: 4rem;
}

.main > *:not(.hero):not(.paper-hero):not(.page-header):not(.about-hero) {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  background: var(--color-surface);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.85rem;
}

.footer-x-link {
  display: inline-flex;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border-light);
}

.footer-attribution {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.footer-company {
  width: 100%;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-top: 0.5rem;
}

.footer-company a {
  color: var(--color-text-muted);
  text-decoration: underline;
}

.footer-made {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* === Hero — Full Bleed with Animated Gradient === */
.hero {
  margin-top: -2rem;
  margin-bottom: 0;

  /* Animated gradient bg */
  background: linear-gradient(-45deg, #1c2432, #1e1f3a, #1a2f30, #1c2432);
  background-size: 400% 400%;
  animation: hero-gradient 30s ease infinite;

  color: var(--color-hero-text);
  padding: 5.5rem 2rem 4.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(211, 82, 51, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(46, 134, 171, 0.1) 0%, transparent 60%);
  z-index: 0;
  pointer-events: none;
}

@keyframes hero-gradient {
  0% { background-position: 0% 50%; }
  25% { background-position: 50% 100%; }
  50% { background-position: 100% 50%; }
  75% { background-position: 50% 0%; }
  100% { background-position: 0% 50%; }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: rgba(248, 247, 244, 0.45);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  line-height: 1.1;
}

.hero-sub {
  font-size: 1.1rem;
  color: rgba(248, 247, 244, 0.65);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.65;
}

/* Hero search */
.hero-search {
  max-width: 440px;
  margin: 2rem auto 0;
  position: relative;
}

.hero-search-input {
  width: 100%;
  padding: 0.85rem 3.5rem 0.85rem 1.25rem;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 50px;
  color: #fff;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  transition: background 0.2s, border-color 0.2s;
}

.hero-search-input::placeholder {
  color: rgba(255, 255, 255, 0.35);
}

.hero-search-input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.12);
}

.hero-search-btn {
  position: absolute;
  right: 5px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-accent);
  border: none;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.hero-search-btn:hover {
  background: #b8462e;
}

.hero-search-btn:active {
  transform: translateY(-50%) scale(0.95);
}

/* Hero stats */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 2rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: rgba(248, 247, 244, 0.4);
}

.hero-stats-sep {
  color: rgba(248, 247, 244, 0.2);
}

.hero-stat-live {
  color: rgba(248, 247, 244, 0.55);
}

.hero-stat-live::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #4ade80;
  margin-right: 0.4rem;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* === Featured Section — Hero Card === */
.featured-section {
  margin-top: 3.5rem;
  margin-bottom: 3.5rem;
}

.featured-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  min-height: 280px;
  display: flex;
  align-items: flex-end;
}

.featured-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(0, 0, 0, 0.45) 0%, rgba(0, 0, 0, 0.75) 100%);
  z-index: 1;
}

.featured-card-body {
  position: relative;
  z-index: 2;
  padding: 2.5rem 3rem;
  color: #fff;
  width: 100%;
}

.featured-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.featured-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.8);
  background: rgba(255, 255, 255, 0.12);
  padding: 0.2rem 0.75rem;
  border-radius: 20px;
}

.featured-category {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
}

.featured-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.featured-title a {
  color: #fff;
  text-decoration: none;
}

.featured-title a:hover {
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.5);
  text-underline-offset: 3px;
}

.featured-eli5 {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 1.5rem;
  max-width: 600px;
}

.featured-eli5 .markdown p:last-child {
  margin-bottom: 0;
}

.featured-cta {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.4);
  transition: border-color 0.15s;
}

.featured-cta:hover {
  text-decoration: none;
  border-bottom-color: #fff;
}

/* === How It Works === */
.how-it-works {
  display: flex;
  gap: 2.5rem;
  padding: 2rem 0 2.5rem;
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--color-border);
}

.how-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.how-icon {
  font-size: 1.4rem;
  margin-bottom: 0.35rem;
}

.how-step strong {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text);
}

.how-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.45;
}

/* === Section Headers === */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.section-header a {
  font-size: 0.85rem;
  font-weight: 500;
}

/* === Paper Cards === */
.paper-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.paper-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 2px var(--radius) var(--radius) 2px;
  margin-bottom: 0.5rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
}

.paper-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-gradient, transparent);
  opacity: 0.6;
}

.paper-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-border);
}

.paper-card-link {
  display: block;
  padding: 1.25rem 1.5rem;
  text-decoration: none;
  color: inherit;
}

.paper-card-link:hover {
  text-decoration: none;
}

.paper-card-headline {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.3rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.paper-card-title {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.paper-card-eli5 {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.paper-card-summary {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.paper-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.paper-card-category {
  background: var(--color-tag-bg);
  padding: 0.1rem 0.55rem;
  border-radius: var(--radius);
  color: var(--color-tag-text);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

/* === Paper Grid (Homepage) === */
.paper-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.paper-grid .paper-card {
  margin-bottom: 0;
}

.paper-grid .paper-card--wide {
  grid-column: 1 / -1;
}

.paper-grid .paper-card--wide .paper-card-eli5 {
  -webkit-line-clamp: 3;
}

.paper-grid .paper-card--wide .paper-card-headline {
  font-size: 1.3rem;
}

.latest-section {
  margin-bottom: 4rem;
}

/* === Paper Hero === */
.paper-hero {
  margin-top: -2rem;
  margin-bottom: 2rem;
  padding: 5rem 2rem 2.5rem;
  position: relative;
  overflow: hidden;
  min-height: 220px;
  display: flex;
  align-items: flex-end;

  /* Animated gradient bg — matches homepage hero */
  background: linear-gradient(-45deg, #1c2432, #1e1f3a, #1a2f30, #1c2432) !important;
  background-size: 400% 400% !important;
  animation: hero-gradient 30s ease infinite;
}

.paper-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(211, 82, 51, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(46, 134, 171, 0.1) 0%, transparent 60%);
  z-index: 0;
  pointer-events: none;
}

.paper-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.08) 0%, rgba(0, 0, 0, 0.58) 100%);
  pointer-events: none;
}

.paper-hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  width: 100%;
}

.paper-hero-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.paper-hero-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  color: rgba(255, 255, 255, 0.9);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.15s;
}

.paper-hero-tag:hover {
  background: rgba(255, 255, 255, 0.25);
  text-decoration: none;
}

.paper-hero-title {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: #fff;
}

.paper-hero-subtitle {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.75);
  margin-top: 0.75rem;
  max-width: 600px;
}

/* === Paper Page === */
.paper-page {
  max-width: var(--content-width);
  margin: 0 auto;
}

.paper-page-header {
  margin-bottom: 2.5rem;
}

.paper-page-authors {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.paper-page-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-light);
}

.paper-page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.paper-page-indicators {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.reading-time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.difficulty-badge {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.15rem 0.6rem;
  border-radius: 20px;
}

.difficulty-coffee {
  background: #fef3c7;
  color: #92400e;
}

.difficulty-deep {
  background: #ede9fe;
  color: #5b21b6;
}

.paper-page-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.category-tag {
  background: var(--color-tag-bg);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius);
  color: var(--color-tag-text);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-decoration: none;
  transition: background 0.15s;
}

.category-tag:hover {
  text-decoration: none;
  background: var(--color-border);
}

.paper-page-links {
  display: flex;
  gap: 0.75rem;
  font-size: 0.85rem;
}

.paper-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 1.1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.paper-link-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-soft);
  text-decoration: none;
}

/* === Paper Tabs === */
.paper-tabs {
  margin-bottom: 2.5rem;
}

.tab-bar {
  display: flex;
  background: #eeecea;
  border-bottom: 2px solid var(--color-border);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0;
  gap: 0;
}

.lang-note {
  margin: 0 0 1rem 0;
  padding: 0;
  font-size: 0.75rem;
  color: #999;
  font-family: var(--font-sans);
  line-height: 1.4;
}

.tab-button {
  flex: 0 1 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  background: transparent;
  border: none;
  border-top: 3px solid transparent;
  border-radius: var(--radius) var(--radius) 0 0;
  margin-bottom: -2px;
  margin-top: 0;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: #888;
  cursor: pointer;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
  white-space: nowrap;
  min-height: 48px;
}

.tab-button:hover {
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.45);
}

.tab-button .tab-icon {
  font-size: 1.15em;
  line-height: 1;
}

.tab-button.active {
  font-weight: 700;
  font-size: 0.93rem;
  color: var(--color-text);
  border-top-color: var(--tab-accent, var(--color-accent));
  border-bottom: 2px solid transparent;
}

.tab-button.active[data-tab="tab-gist"] {
  background: var(--color-eli5-bg);
}

.tab-button.active[data-tab="tab-technical"] {
  background: #f8fafc;
}

.tab-content {
  transition: opacity 0.15s ease;
}

.tab-content.tab-fade-out {
  opacity: 0;
}

.tab-panel {
  padding: 2rem 2rem 1.5rem;
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

.tab-panel-gist {
  background: var(--color-eli5-bg);
  border-left: 4px solid var(--color-eli5-accent);
}

.tab-panel-gist .markdown {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--color-text);
}

.tab-panel-technical {
  background: #f8fafc;
  border-left: 4px solid #94a3b8;
}


/* === Markdown === */
.markdown h1,
.markdown h2,
.markdown h3 {
  font-family: var(--font-serif);
  letter-spacing: -0.02em;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.markdown h1 { font-size: 1.5rem; }
.markdown h2 { font-size: 1.25rem; }
.markdown h3 { font-size: 1.1rem; }

.markdown p {
  margin-bottom: 1rem;
}

.markdown ul,
.markdown ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.markdown li {
  margin-bottom: 0.4rem;
}

.markdown strong {
  font-weight: 600;
}

.markdown code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-tag-bg);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.markdown pre {
  background: var(--color-tag-bg);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin-bottom: 1rem;
}

.markdown pre code {
  background: none;
  padding: 0;
}

.markdown blockquote {
  border-left: 3px solid var(--color-eli5-accent);
  padding-left: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  font-style: italic;
}

/* === Key Points === */
.key-points-section {
  margin-bottom: 2.5rem;
}

.key-points-label {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

/* === Share === */
.share-links {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  margin: 2.5rem 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.share-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.share-btn {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.share-btn:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}


/* === Related Papers === */
.related-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.related-section h2 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* === Category Domains (Homepage) === */
.categories-section {
  margin-bottom: 3rem;
}

.category-domains {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.category-domain {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.category-domain-label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  min-width: 130px;
  flex-shrink: 0;
}

.category-domain-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.category-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.7rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text);
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.category-pill:hover {
  border-color: var(--pill-color, var(--color-accent));
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
  text-decoration: none;
}

.category-pill-icon {
  font-size: 0.85rem;
}

.category-pill-count {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  color: var(--color-text-muted);
  background: var(--color-tag-bg);
  padding: 0.05rem 0.4rem;
  border-radius: 10px;
  margin-left: 0.1rem;
}

/* === Category Grid (Category/Today pages) === */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.6rem;
  margin-bottom: 2.5rem;
}

.category-card {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}

.category-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
  text-decoration: none;
}

.category-card-icon {
  font-size: 1rem;
  margin-right: 0.15rem;
}

.category-count {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* === Search === */
.search-form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.search-input {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.75rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.search-btn {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.search-btn:hover {
  background: #b8462e;
}

.search-btn:active {
  transform: scale(0.98);
}

/* === Pagination === */
.pagination {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 2rem;
}

.pagination a {
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.pagination a:hover {
  background: var(--color-surface);
  border-color: var(--color-accent);
  text-decoration: none;
}

/* === Category Groups === */
.category-group {
  margin-bottom: 2.5rem;
}

.category-group-header {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0.75rem;
}

/* === Page Header (shared across category/today/search/about/privacy) === */
.page-header {
  margin-top: -2rem;
  margin-bottom: 2.5rem;
  background: linear-gradient(-45deg, #1c2432, #1e1f3a, #1a2f30, #1c2432);
  background-size: 400% 400%;
  animation: hero-gradient 30s ease infinite;
  color: var(--color-hero-text);
  padding: 3.5rem 2rem 2.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(211, 82, 51, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(46, 134, 171, 0.08) 0%, transparent 60%);
  z-index: 0;
  pointer-events: none;
}

.page-header-inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}

.page-header-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(248, 247, 244, 0.4);
  margin-bottom: 0.75rem;
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.5rem;
}

.page-header-sub {
  font-size: 1rem;
  color: rgba(248, 247, 244, 0.6);
  line-height: 1.6;
}

/* === About === */
.about-hero {
  background: linear-gradient(135deg, #faf8f5 0%, #f5efe8 50%, #faf8f5 100%);
  padding: 4rem 2rem 3rem;
  text-align: center;
  margin-top: -2rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.about-hero-inner {
  max-width: 600px;
  margin: 0 auto;
}

.about-hero h1 {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.about-hero-sub {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  font-style: italic;
}

.about-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding-bottom: 2rem;
}

.about-content h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.about-content p {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.about-content a {
  color: var(--color-accent);
}

.about-story {
  margin-bottom: 1rem;
}

.about-emphasis {
  font-size: 1.15rem !important;
  font-weight: 600;
  color: var(--color-text) !important;
  font-style: italic;
}

.about-closing {
  font-style: italic;
  margin-top: 0.5rem;
}

.about-how {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.about-how h2 {
  margin-top: 0;
}

.about-steps {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1rem;
}

.about-step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.about-step-num {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: white;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.15rem;
}

.about-step strong {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  display: block;
  margin-bottom: 0.15rem;
}

.about-step-desc {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.about-credentials {
  text-align: center;
  font-family: var(--font-sans) !important;
  font-size: 0.9rem !important;
  font-weight: 500;
  color: var(--color-text-muted) !important;
  letter-spacing: 0.02em;
  padding: 1rem 0;
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  margin: 2rem 0;
}

.about-tech {
  margin-bottom: 1rem;
}

.about-ack {
  margin-bottom: 1rem;
}

.about-ack p,
.about-contact p {
  font-size: 0.95rem !important;
  color: var(--color-text-muted) !important;
}

/* === Testimonials === */
.testimonials-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding-bottom: 3rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.testimonial-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem 2rem;
  position: relative;
}

.testimonial-card::before {
  content: '\201C';
  font-family: var(--font-serif);
  font-size: 4rem;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.25;
  position: absolute;
  top: 0.75rem;
  left: 1.5rem;
}

.testimonial-quote {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.8;
  color: var(--color-text);
  font-style: italic;
  margin-bottom: 1.25rem;
}

.testimonial-attribution {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.testimonial-name {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.testimonial-role {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

@media (max-width: 600px) {
  .testimonials-content {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .testimonial-card {
    padding: 2rem 1.5rem 1.5rem;
  }

  .testimonial-quote {
    font-size: 1.05rem;
  }
}

/* === Newsletter Signup (Hero) === */
.newsletter-hero {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.newsletter-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.newsletter-sub {
  font-size: 0.9rem;
  color: rgba(248, 247, 244, 0.6);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.newsletter-form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  max-width: 420px;
  margin: 0 auto;
}

.newsletter-form-row {
  display: flex;
  gap: 0.5rem;
  width: 100%;
}

.newsletter-input {
  flex: 1;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 50px;
  color: #fff;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  transition: background 0.2s, border-color 0.2s;
}

.newsletter-input::placeholder {
  color: rgba(255, 255, 255, 0.35);
}

.newsletter-input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.12);
}

.newsletter-btn {
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: 50px;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap;
}

.newsletter-btn:hover {
  background: #b8462e;
}

.newsletter-btn:active {
  transform: scale(0.97);
}

.newsletter-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.newsletter-msg {
  display: none;
  font-size: 0.85rem;
  margin-top: 0.75rem;
  text-align: center;
}

.newsletter-success {
  color: #4ade80;
}

.newsletter-error {
  color: #f87171;
}

.newsletter-privacy {
  font-size: 0.75rem;
  color: rgba(248, 247, 244, 0.35);
  margin-top: 0.6rem;
  text-align: center;
}

/* === Newsletter Signup (Inline — paper/category pages) === */
.newsletter-inline {
  text-align: center;
  padding: 2rem;
  margin: 2.5rem 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.newsletter-inline-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.newsletter-form-inline .newsletter-input {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.newsletter-form-inline .newsletter-input::placeholder {
  color: var(--color-text-muted);
}

.newsletter-form-inline .newsletter-input:focus {
  border-color: var(--color-accent);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.newsletter-inline .newsletter-privacy {
  color: var(--color-text-muted);
}

.newsletter-inline .newsletter-success {
  color: #16a34a;
}

.newsletter-inline .newsletter-error {
  color: var(--color-accent);
}

/* === No Results === */
.no-results {
  text-align: center;
  padding: 3rem 0;
  color: var(--color-text-muted);
}

.no-results p {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

/* === Responsive === */
@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  .hero {
    padding: 3.5rem 1.5rem 3rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .hero-search {
    max-width: 100%;
  }

  .nav-links {
    gap: 0.75rem;
  }

  .paper-card-link {
    padding: 1rem;
  }

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

  .paper-grid .paper-card--wide {
    grid-column: auto;
  }

  .paper-grid .paper-card--wide .paper-card-headline {
    font-size: 1.15rem;
  }

  .tab-button {
    flex: 1;
    justify-content: center;
    text-align: center;
    padding: 0.65rem 0.5rem;
    font-size: 0.82rem;
    min-height: 48px;
  }

  .tab-button .tab-icon {
    font-size: 1.25em;
  }

  .tab-button.active {
    font-size: 0.85rem;
  }

  .tab-panel {
    padding: 1.25rem 1.25rem 1rem;
  }

  .paper-hero {
    padding: 3.5rem 1.5rem 1.75rem;
    min-height: 160px;
  }

  .paper-hero-title {
    font-size: 1.5rem;
  }

  .paper-hero-subtitle {
    font-size: 0.95rem;
  }

  .page-header {
    padding: 2.5rem 1.5rem 2rem;
  }

  .page-header h1 {
    font-size: 1.8rem;
  }

  .paper-page-meta-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .featured-card {
    min-height: 200px;
  }

  .featured-card-body {
    padding: 1.5rem;
  }

  .featured-title {
    font-size: 1.5rem;
  }

  .how-it-works {
    flex-direction: column;
    gap: 1.25rem;
  }

  .how-step {
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
  }

  .how-icon {
    margin-bottom: 0;
    font-size: 1.2rem;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 0.3rem 0.6rem;
    font-size: 0.72rem;
  }

  .paper-page-indicators {
    flex-wrap: wrap;
  }

  .category-domain {
    flex-direction: column;
    gap: 0.5rem;
  }

  .category-domain-label {
    min-width: auto;
  }

  .category-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }

  .search-form {
    flex-direction: column;
  }

  .share-links {
    flex-wrap: wrap;
  }

  .newsletter-form-row {
    flex-direction: column;
  }

  .newsletter-hero {
    margin-top: 2rem;
    padding-top: 1.5rem;
  }

  .footer-top {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }
}

/* === Hamburger menu (mobile) === */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 2rem;
  height: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  z-index: 110;
}

.nav-hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.25s, opacity 0.25s;
}

.nav-hamburger-open .nav-hamburger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-hamburger-open .nav-hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-hamburger-open .nav-hamburger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 480px) {
  .nav-hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 3.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: 0.5rem 0;
    z-index: 100;
  }

  .nav-links-open {
    display: flex;
  }

  .nav-links > a {
    display: block;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    border-bottom: none;
  }

  .nav-links > a:hover {
    background: var(--color-bg);
    color: var(--color-text);
    border-bottom: none;
  }

  .nav-bottom-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1.5rem 0.75rem;
    border-top: 1px solid var(--color-border-light);
    margin-top: 0.25rem;
  }

  .lang-dropdown {
    margin-left: 0;
    padding: 0;
    border-top: none;
    margin-top: 0;
  }

  .lang-dropdown-toggle {
    font-size: 0.75rem;
  }

  .theme-toggle {
    margin-left: 0;
    width: auto;
    padding: 0.25rem 0.5rem;
    flex-shrink: 0;
  }

}

/* === Theme Toggle === */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: auto;
  padding: 0.25rem 0.5rem;
  margin-left: 0.25rem;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.theme-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

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

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

/* === Dark Mode Overrides (hardcoded colors) === */
[data-theme="dark"] .tab-bar {
  background: #2e2e32;
}

[data-theme="dark"] .lang-note {
  color: #7a776f;
}

[data-theme="dark"] .tab-button {
  color: #7a776f;
}

[data-theme="dark"] .tab-button:hover {
  background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .tab-button.active[data-tab="tab-technical"] {
  background: #1e2028;
}

[data-theme="dark"] .tab-panel-technical {
  background: #1e2028;
  border-left-color: #5a6578;
}

[data-theme="dark"] .difficulty-coffee {
  background: #3a3020;
  color: #e6a817;
}

[data-theme="dark"] .difficulty-deep {
  background: #2a2040;
  color: #a78bfa;
}

[data-theme="dark"] .lang-dropdown-menu {
  background: var(--color-surface);
}

[data-theme="dark"] .about-hero {
  background: linear-gradient(-45deg, #1c2432, #1e1f3a, #1a2f30, #1c2432);
  background-size: 400% 400%;
  animation: hero-gradient 30s ease infinite;
  border-bottom-color: var(--color-border);
  color: var(--color-hero-text);
}

[data-theme="dark"] .about-hero h1 {
  color: var(--color-hero-text);
}

[data-theme="dark"] .about-hero-sub {
  color: rgba(248, 247, 244, 0.6);
}

[data-theme="dark"] img {
  opacity: 0.9;
}

/* Smooth transition for theme switching */
html.theme-transition,
html.theme-transition *,
html.theme-transition *::before,
html.theme-transition *::after {
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease !important;
}

/* === Admin Toolbar === */
.admin-toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  margin-bottom: 1rem;
  background: #fef3c7;
  border: 1px solid #f59e0b;
  border-radius: 6px;
  font-size: 0.8rem;
}

[data-theme="dark"] .admin-toolbar {
  background: #422006;
  border-color: #b45309;
}

.admin-label {
  font-weight: 700;
  color: #92400e;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.7rem;
}

[data-theme="dark"] .admin-label {
  color: #fbbf24;
}

.admin-btn {
  padding: 0.25rem 0.75rem;
  border: 1px solid #d1d5db;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 0.8rem;
  font-family: inherit;
}

.admin-btn:hover {
  background: #f3f4f6;
}

[data-theme="dark"] .admin-btn {
  background: #1f2937;
  border-color: #4b5563;
  color: #e5e7eb;
}

[data-theme="dark"] .admin-btn:hover {
  background: #374151;
}

.admin-btn-block {
  border-color: #ef4444;
  color: #dc2626;
}

.admin-btn-block:hover {
  background: #fef2f2;
}

[data-theme="dark"] .admin-btn-block {
  border-color: #991b1b;
  color: #f87171;
}

[data-theme="dark"] .admin-btn-block:hover {
  background: #451a1a;
}

.admin-btn-edit {
  border-color: #3b82f6;
  color: #2563eb;
}

.admin-btn-edit:hover {
  background: #eff6ff;
}

[data-theme="dark"] .admin-btn-edit {
  border-color: #1d4ed8;
  color: #60a5fa;
}

[data-theme="dark"] .admin-btn-edit:hover {
  background: #1e3a5f;
}

.admin-status {
  color: #6b7280;
  font-style: italic;
}

.admin-dialog {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-width: 480px;
  width: 90vw;
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-lg);
  margin: auto;
  inset: 0;
}

.admin-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
}

.admin-dialog-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.admin-dialog-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
}

.admin-dialog-label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.admin-dialog-textarea {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  resize: vertical;
}

.admin-dialog-select {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
}

.admin-dialog-row {
  display: flex;
  gap: 1rem;
}

.admin-dialog-row > * {
  flex: 1;
}

.admin-dialog-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

.admin-btn-submit {
  background: #2563eb;
  color: #fff;
  border-color: #2563eb;
}

.admin-btn-submit:hover {
  background: #1d4ed8;
}

.admin-btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

[data-theme="dark"] .admin-btn-submit {
  background: #1d4ed8;
  border-color: #1d4ed8;
  color: #fff;
}

[data-theme="dark"] .admin-btn-submit:hover {
  background: #1e40af;
}

.admin-dialog-status {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-style: italic;
  min-height: 1.2em;
}

.admin-revisions-dialog {
  max-width: 640px;
}

.admin-revisions-tabs {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.admin-revisions-tab {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text-secondary);
  cursor: pointer;
}

.admin-revisions-tab.active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.admin-revisions-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.admin-revisions-table th,
.admin-revisions-table td {
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.admin-revisions-table th {
  background: var(--color-bg);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.admin-btn-revert {
  border-color: #f59e0b;
  color: #d97706;
}

.admin-btn-revert:hover {
  background: #fffbeb;
}

[data-theme="dark"] .admin-btn-revert {
  border-color: #b45309;
  color: #fbbf24;
}

[data-theme="dark"] .admin-btn-revert:hover {
  background: #451a03;
}