/* ==========================================================
   TX1 User Guide — sleek minimalist stylesheet
   Self-contained, no dependencies
   ========================================================== */

:root {
  --tx1-bg: #ffffff;
  --tx1-bg-soft: #fafbfb;
  --tx1-ink: #0a0a0a;
  --tx1-ink-soft: #525252;
  --tx1-ink-muted: #a3a3a3;
  --tx1-line: rgba(0, 0, 0, 0.08);
  --tx1-line-strong: rgba(0, 0, 0, 0.16);
  --tx1-accent: #ff7f50;
  --tx1-accent-dark: #e5613a;
  --tx1-accent-bright: #ff9977;
  --tx1-accent-soft: rgba(255, 127, 80, 0.08);
  --tx1-warning: #f59e0b;
  --tx1-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --tx1-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --tx1-rule: 1px;
  --tx1-gutter: clamp(1rem, 4vw, 2rem);
  --tx1-max: 1400px;
  --tx1-content-max: 760px;
  --tx1-sidebar: 280px;
  --tx1-header-h: 60px;
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
    --tx1-bg: #0a0a0a;
    --tx1-bg-soft: #141414;
    --tx1-ink: #ffffff;
    --tx1-ink-soft: #a3a3a3;
    --tx1-ink-muted: #737373;
    --tx1-line: rgba(255, 255, 255, 0.08);
    --tx1-line-strong: rgba(255, 255, 255, 0.16);
    --tx1-accent-soft: rgba(255, 127, 80, 0.12);
  }
}

:root[data-theme="dark"] {
  --tx1-bg: #0a0a0a;
  --tx1-bg-soft: #141414;
  --tx1-ink: #ffffff;
  --tx1-ink-soft: #a3a3a3;
  --tx1-ink-muted: #737373;
  --tx1-line: rgba(255, 255, 255, 0.08);
  --tx1-line-strong: rgba(255, 255, 255, 0.16);
  --tx1-accent-soft: rgba(255, 127, 80, 0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--tx1-bg);
  color: var(--tx1-ink);
  font-family: var(--tx1-font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--tx1-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--tx1-line);
  transition: color 150ms ease, border-color 150ms ease;
}

a:hover {
  color: var(--tx1-accent-dark);
  border-color: var(--tx1-accent);
}

/* ---------- Top bar ---------- */
.tx1-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--tx1-header-h);
  border-bottom: 1px solid var(--tx1-line);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0 var(--tx1-gutter);
}

[data-theme="dark"] .tx1-header {
  background: rgba(10, 10, 10, 0.9);
}

.tx1-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: none;
  color: var(--tx1-ink);
}

.tx1-header__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--tx1-accent);
  background: var(--tx1-accent-soft);
  font-weight: 800;
  font-size: 0.7rem;
  letter-spacing: -0.02em;
  color: var(--tx1-accent-dark);
}

.tx1-header__brand-logo {
  height: 28px;
  width: auto;
  max-width: 140px;
  object-fit: contain;
  display: block;
}

/* Show light-bg logo by default, swap in dark mode */
.tx1-header__brand-logo--dark { display: none; }
[data-theme="dark"] .tx1-header__brand-logo--light { display: none; }
[data-theme="dark"] .tx1-header__brand-logo--dark { display: block; }

.tx1-header__brand-label {
  color: var(--tx1-ink-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.7rem;
  border-left: 1px solid var(--tx1-line);
  padding-left: 0.6rem;
  margin-left: 0.2rem;
}

@media (max-width: 640px) {
  .tx1-header__brand-label {
    display: none;
  }
  .tx1-header__brand-logo {
    height: 24px;
    max-width: 110px;
  }
}

.tx1-header__search {
  flex: 1;
  max-width: 520px;
  position: relative;
}

.tx1-search-input {
  width: 100%;
  padding: 0.5rem 0.75rem 0.5rem 2.25rem;
  font-size: 0.875rem;
  font-family: var(--tx1-font);
  color: var(--tx1-ink);
  background: transparent;
  border: 1px solid var(--tx1-line);
  border-radius: 4px;
  outline: none;
  transition: border-color 200ms ease;
}

.tx1-search-input::placeholder {
  color: var(--tx1-ink-muted);
}

.tx1-search-input:focus {
  border-color: var(--tx1-accent);
}

.tx1-header__search::before {
  content: '';
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  background: none;
  border: 1.5px solid var(--tx1-ink-muted);
  border-radius: 50%;
}

.tx1-header__search::after {
  content: '';
  position: absolute;
  left: 1.5rem;
  top: calc(50% + 3px);
  width: 5px;
  height: 1.5px;
  background: var(--tx1-ink-muted);
  transform: rotate(45deg);
  transform-origin: left center;
}

.tx1-header__kbd {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--tx1-mono);
  font-size: 0.65rem;
  color: var(--tx1-ink-muted);
  padding: 2px 5px;
  border: 1px solid var(--tx1-line);
  border-radius: 3px;
  pointer-events: none;
}

.tx1-header__nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-left: auto;
}

.tx1-header__nav a {
  border: none;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--tx1-ink-soft);
  letter-spacing: 0.02em;
}

.tx1-header__nav a:hover {
  color: var(--tx1-accent-dark);
}

.tx1-header__theme-toggle {
  background: none;
  border: 1px solid var(--tx1-line);
  border-radius: 4px;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--tx1-ink-soft);
  padding: 0;
}

.tx1-header__theme-toggle:hover {
  border-color: var(--tx1-accent);
  color: var(--tx1-accent);
}

.tx1-header__mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--tx1-line);
  border-radius: 4px;
  width: 30px;
  height: 30px;
  cursor: pointer;
  padding: 0;
  position: relative;
}

.tx1-header__mobile-toggle::before,
.tx1-header__mobile-toggle::after {
  content: '';
  position: absolute;
  left: 6px;
  right: 6px;
  height: 1.5px;
  background: var(--tx1-ink);
}

.tx1-header__mobile-toggle::before { top: 9px; }
.tx1-header__mobile-toggle::after { bottom: 9px; }

/* ---------- Three-column layout ---------- */
.tx1-shell {
  display: grid;
  grid-template-columns: var(--tx1-sidebar) minmax(0, 1fr);
  max-width: var(--tx1-max);
  margin: 0 auto;
  min-height: calc(100vh - var(--tx1-header-h));
}

.tx1-sidebar {
  border-right: 1px solid var(--tx1-line);
  padding: 2rem 1.5rem 4rem;
  position: sticky;
  top: var(--tx1-header-h);
  height: calc(100vh - var(--tx1-header-h));
  overflow-y: auto;
  background: var(--tx1-bg);
}

.tx1-sidebar__section {
  margin-bottom: 1.75rem;
}

.tx1-sidebar__label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--tx1-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--tx1-line);
}

.tx1-sidebar__link {
  display: block;
  padding: 0.3rem 0.5rem 0.3rem 0;
  font-size: 0.82rem;
  color: var(--tx1-ink-soft);
  border: none;
  border-left: 2px solid transparent;
  padding-left: 0.75rem;
  margin-left: -0.75rem;
  transition: all 150ms ease;
}

.tx1-sidebar__link:hover {
  color: var(--tx1-ink);
  border-left-color: var(--tx1-line-strong);
  background: var(--tx1-bg-soft);
}

.tx1-sidebar__link--active {
  color: var(--tx1-accent-dark);
  border-left-color: var(--tx1-accent);
  font-weight: 600;
}

.tx1-sidebar__num {
  display: inline-block;
  font-family: var(--tx1-mono);
  font-size: 0.7rem;
  color: var(--tx1-ink-muted);
  min-width: 2rem;
}

/* ---------- Main content ---------- */
.tx1-main {
  padding: 3rem var(--tx1-gutter) 5rem;
  min-width: 0;
}

.tx1-content {
  max-width: var(--tx1-content-max);
  margin: 0 auto;
}

.tx1-breadcrumb {
  font-size: 0.75rem;
  color: var(--tx1-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.tx1-breadcrumb a {
  color: var(--tx1-ink-muted);
  border: none;
  font-weight: 600;
}

.tx1-breadcrumb a:hover {
  color: var(--tx1-accent-dark);
}

.tx1-breadcrumb span.sep {
  color: var(--tx1-line-strong);
}

.tx1-breadcrumb span.current {
  color: var(--tx1-accent-dark);
  font-weight: 600;
}

.tx1-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--tx1-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  margin-bottom: 0.75rem;
}

.tx1-eyebrow::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--tx1-accent);
}

/* ---------- Typography ---------- */
.tx1-content h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  color: var(--tx1-ink);
}

.tx1-content h2 {
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 3rem 0 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--tx1-line);
  scroll-margin-top: calc(var(--tx1-header-h) + 1.5rem);
}

.tx1-content h2:first-of-type {
  margin-top: 2.25rem;
}

.tx1-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 2rem 0 0.75rem;
  scroll-margin-top: calc(var(--tx1-header-h) + 1.5rem);
}

.tx1-content p {
  margin: 0 0 1.1rem;
  color: var(--tx1-ink-soft);
  line-height: 1.7;
}

.tx1-content strong {
  color: var(--tx1-ink);
  font-weight: 700;
}

.tx1-content em {
  color: var(--tx1-ink);
}

.tx1-content ul,
.tx1-content ol {
  margin: 0 0 1.25rem;
  padding-left: 1.5rem;
  color: var(--tx1-ink-soft);
}

.tx1-content li {
  margin-bottom: 0.35rem;
  line-height: 1.7;
}

.tx1-content ul li::marker {
  color: var(--tx1-accent);
}

/* Lede paragraph (first paragraph after H1) */
.tx1-content > p:first-of-type {
  font-size: 1.075rem;
  color: var(--tx1-ink);
  line-height: 1.65;
}

/* ---------- Tables ---------- */
.tx1-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 1.75rem;
  font-size: 0.9rem;
  display: block;
  overflow-x: auto;
  white-space: nowrap;
}

@media (min-width: 700px) {
  .tx1-content table {
    display: table;
    white-space: normal;
  }
}

.tx1-content thead th {
  text-align: left;
  padding: 0.6rem 0.9rem;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--tx1-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  border-bottom: 1px solid var(--tx1-accent);
  white-space: nowrap;
}

.tx1-content tbody td {
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--tx1-line);
  vertical-align: top;
  color: var(--tx1-ink-soft);
}

.tx1-content tbody tr:hover td {
  background: var(--tx1-accent-soft);
}

.tx1-content tbody td strong {
  color: var(--tx1-ink);
}

/* ---------- Code ---------- */
.tx1-content code {
  font-family: var(--tx1-mono);
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  background: var(--tx1-accent-soft);
  border: 1px solid rgba(255, 127, 80, 0.2);
  border-radius: 3px;
  color: var(--tx1-accent-dark);
}

[data-theme="dark"] .tx1-content code {
  color: var(--tx1-accent-bright);
}

.tx1-content pre {
  background: var(--tx1-bg-soft);
  border: 1px solid var(--tx1-line);
  border-left: 2px solid var(--tx1-accent);
  padding: 1.1rem 1.25rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
  border-radius: 0;
}

.tx1-content pre code {
  padding: 0;
  background: none;
  border: none;
  color: var(--tx1-ink);
  font-size: inherit;
}

/* ---------- Callout boxes ---------- */
.tx1-callout {
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-left: 2px solid var(--tx1-accent);
  background: transparent;
  position: relative;
}

.tx1-callout__label {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--tx1-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 0.35rem;
}

.tx1-callout--tip { border-left-color: var(--tx1-accent); }
.tx1-callout--warning { border-left-color: var(--tx1-warning); }
.tx1-callout--warning .tx1-callout__label { color: var(--tx1-warning); }
.tx1-callout--formula { border-left-color: #6366f1; background: rgba(99, 102, 241, 0.04); }
.tx1-callout--formula .tx1-callout__label { color: #6366f1; }
.tx1-callout--workflow { border-left-color: var(--tx1-accent-dark); }

.tx1-callout p:last-child { margin-bottom: 0; }

/* ---------- Hub / landing ---------- */
.tx1-hub {
  max-width: var(--tx1-max);
  margin: 0 auto;
  padding: 3.5rem var(--tx1-gutter) 5rem;
}

.tx1-hub__hero {
  position: relative;
  padding-bottom: 3rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--tx1-line);
}

.tx1-hub__hero::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 30%;
  height: 1px;
  background: var(--tx1-accent);
}

.tx1-hub__title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.02;
  margin: 1rem 0 1rem;
  color: var(--tx1-ink);
}

.tx1-hub__title-accent {
  background: linear-gradient(135deg, var(--tx1-accent) 0%, var(--tx1-accent-dark) 60%, var(--tx1-ink) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tx1-hub__subtitle {
  font-size: 1.15rem;
  color: var(--tx1-ink-soft);
  max-width: 56ch;
  line-height: 1.65;
  margin: 0 0 2rem;
}

.tx1-hub__search {
  max-width: 600px;
  position: relative;
}

.tx1-hub__search input {
  width: 100%;
  font-family: var(--tx1-font);
  font-size: 1rem;
  padding: 1rem 1rem 1rem 3rem;
  background: transparent;
  border: 1px solid var(--tx1-line-strong);
  border-radius: 4px;
  color: var(--tx1-ink);
  outline: none;
  transition: border-color 200ms ease;
}

.tx1-hub__search input:focus {
  border-color: var(--tx1-accent);
}

.tx1-hub__search::before {
  content: '';
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  background: none;
  border: 1.5px solid var(--tx1-ink-muted);
  border-radius: 50%;
}

.tx1-hub__search::after {
  content: '';
  position: absolute;
  left: 1.85rem;
  top: calc(50% + 3px);
  width: 6px;
  height: 1.5px;
  background: var(--tx1-ink-muted);
  transform: rotate(45deg);
  transform-origin: left center;
}

/* Search results dropdown */
.tx1-search-results {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  max-height: 420px;
  overflow-y: auto;
  background: var(--tx1-bg);
  border: 1px solid var(--tx1-line-strong);
  border-top: 1px solid var(--tx1-accent);
  z-index: 30;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  display: none;
}

.tx1-search-results[data-open="true"] {
  display: block;
}

.tx1-search-result {
  display: block;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  border: none;
  border-bottom: 1px solid var(--tx1-line);
  color: var(--tx1-ink);
}

.tx1-search-result:last-child {
  border-bottom: none;
}

.tx1-search-result:hover,
.tx1-search-result[aria-selected="true"] {
  background: var(--tx1-accent-soft);
  color: var(--tx1-accent-dark);
}

.tx1-search-result__path {
  display: block;
  font-size: 0.65rem;
  color: var(--tx1-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 0.15rem;
}

.tx1-search-result__title {
  font-weight: 600;
}

.tx1-search-result__snippet {
  display: block;
  font-size: 0.75rem;
  color: var(--tx1-ink-soft);
  margin-top: 0.25rem;
  line-height: 1.4;
}

.tx1-search-results mark {
  background: rgba(255, 127, 80, 0.25);
  color: var(--tx1-accent-dark);
  padding: 0 2px;
  font-weight: 700;
}

/* ---------- Hub section grid ---------- */
.tx1-hub__sections {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0;
  border-top: 1px solid var(--tx1-line);
}

.tx1-hub__section {
  display: block;
  padding: 1.5rem;
  border: none;
  border-right: 1px solid var(--tx1-line);
  border-bottom: 1px solid var(--tx1-line);
  color: var(--tx1-ink);
  position: relative;
  transition: background 200ms ease;
}

.tx1-hub__section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 1px;
  width: 0;
  background: linear-gradient(90deg, var(--tx1-accent) 0%, transparent 100%);
  transition: width 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.tx1-hub__section:hover {
  background: var(--tx1-accent-soft);
}

.tx1-hub__section:hover::before {
  width: 100%;
}

.tx1-hub__section-num {
  display: block;
  font-family: var(--tx1-mono);
  font-size: 0.7rem;
  color: var(--tx1-accent-dark);
  letter-spacing: 0.15em;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.tx1-hub__section-title {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.4rem;
  line-height: 1.25;
}

.tx1-hub__section-desc {
  display: block;
  font-size: 0.82rem;
  color: var(--tx1-ink-soft);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.tx1-hub__section-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.68rem;
  color: var(--tx1-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 600;
}

.tx1-hub__section-arrow {
  color: var(--tx1-accent);
  transition: transform 200ms ease;
}

.tx1-hub__section:hover .tx1-hub__section-arrow {
  transform: translateX(4px);
}

/* Reading paths */
.tx1-paths {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--tx1-line);
}

.tx1-paths__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.tx1-path {
  border-top: 1px solid var(--tx1-accent);
  padding-top: 1rem;
}

.tx1-path__title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.tx1-path__steps {
  font-family: var(--tx1-mono);
  font-size: 0.78rem;
  color: var(--tx1-ink-soft);
  line-height: 1.8;
  word-break: break-word;
}

/* ---------- Section landing ---------- */
.tx1-section-landing {
  max-width: 900px;
}

.tx1-section-landing__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0.25rem 0 1rem;
}

.tx1-section-landing__desc {
  font-size: 1.05rem;
  color: var(--tx1-ink-soft);
  margin-bottom: 2rem;
  max-width: 60ch;
  line-height: 1.65;
}

.tx1-section-landing__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--tx1-line);
}

.tx1-section-landing__item {
  border-bottom: 1px solid var(--tx1-line);
  position: relative;
}

.tx1-section-landing__item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 1px;
  width: 0;
  background: linear-gradient(90deg, var(--tx1-accent) 0%, transparent 100%);
  transition: width 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.tx1-section-landing__item:hover::before {
  width: 100%;
}

.tx1-section-landing__link {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem 0.5rem;
  border: none;
  color: var(--tx1-ink);
  transition: padding-left 250ms ease;
}

.tx1-section-landing__item:hover .tx1-section-landing__link {
  padding-left: 1rem;
}

.tx1-section-landing__item-num {
  font-family: var(--tx1-mono);
  font-size: 0.75rem;
  color: var(--tx1-accent-dark);
  letter-spacing: 0.12em;
  font-weight: 600;
  min-width: 3rem;
}

.tx1-section-landing__item-title {
  font-size: 1rem;
  font-weight: 600;
}

.tx1-section-landing__item-arrow {
  color: var(--tx1-ink-muted);
  font-size: 0.75rem;
  transition: transform 200ms ease, color 200ms ease;
}

.tx1-section-landing__item:hover .tx1-section-landing__item-arrow {
  color: var(--tx1-accent);
  transform: translateX(4px);
}

.tx1-section-landing__item--stub .tx1-section-landing__link {
  opacity: 0.45;
  pointer-events: none;
}

.tx1-section-landing__item--stub .tx1-section-landing__item-title::after {
  content: ' · COMING SOON';
  font-size: 0.65rem;
  color: var(--tx1-ink-muted);
  letter-spacing: 0.15em;
  font-weight: 700;
}

/* ---------- Pagination / prev-next ---------- */
.tx1-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--tx1-line);
}

.tx1-pager__link {
  padding: 1rem 1.25rem;
  border: 1px solid var(--tx1-line);
  border-radius: 0;
  color: var(--tx1-ink);
  transition: border-color 200ms ease, background 200ms ease;
  display: block;
}

.tx1-pager__link:hover {
  border-color: var(--tx1-accent);
  background: var(--tx1-accent-soft);
}

.tx1-pager__dir {
  display: block;
  font-size: 0.65rem;
  color: var(--tx1-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.tx1-pager__title {
  font-size: 0.95rem;
  font-weight: 600;
}

.tx1-pager__link--next {
  text-align: right;
}

/* ---------- Mobile ---------- */
@media (max-width: 900px) {
  .tx1-shell {
    grid-template-columns: 1fr;
  }

  .tx1-sidebar {
    position: fixed;
    top: var(--tx1-header-h);
    left: 0;
    width: min(320px, 85vw);
    height: calc(100vh - var(--tx1-header-h));
    transform: translateX(-100%);
    transition: transform 250ms ease;
    z-index: 40;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
  }

  .tx1-sidebar[data-open="true"] {
    transform: translateX(0);
  }

  .tx1-header__mobile-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .tx1-main {
    padding: 2rem 1.25rem 4rem;
  }

  .tx1-hub {
    padding: 2.5rem 1.25rem 4rem;
  }

  .tx1-header__search {
    display: none;
  }

  .tx1-hub__title {
    font-size: clamp(2rem, 8vw, 3rem);
  }
}

@media (max-width: 640px) {
  .tx1-content table {
    font-size: 0.8rem;
  }
  .tx1-content thead th,
  .tx1-content tbody td {
    padding: 0.5rem 0.65rem;
  }
  .tx1-pager {
    grid-template-columns: 1fr;
  }
}

/* Sidebar backdrop when open on mobile */
.tx1-sidebar-backdrop {
  display: none;
  position: fixed;
  inset: var(--tx1-header-h) 0 0 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 35;
}

.tx1-sidebar-backdrop[data-open="true"] {
  display: block;
}

/* Accessibility */
*:focus-visible {
  outline: 2px solid var(--tx1-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}