/* ─── CSS Custom Properties ─────────────────────────────────────────────────── */
:root {
  --color-primary: #0066CC;
  --color-primary-dark: #0052A3;
  --color-primary-light: #E8F2FF;
  --color-secondary: #00A896;
  --color-text: #1A1A2E;
  --color-text-muted: #5C5C7A;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8F9FA;
  --color-border: #DEE2E6;
  --color-success: #1A7F37;
  --color-success-bg: #DAFBE1;
  --color-error: #CF222E;
  --color-error-bg: #FFEBE9;
  --color-warning: #9A6700;
  --color-warning-bg: #FFF8C5;
  --font-system: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --transition: 0.2s ease;
  --max-w-content: 780px;
  --max-w-site: 1200px;
  --max-w-tool: 880px;
  --header-h: 64px;
}

/* ─── Reset & Base ───────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-system);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); }
a:hover { color: var(--color-primary-dark); }
code, kbd { font-family: var(--font-mono); }
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ─── Skip Link ─────────────────────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 9999;
}
.skip-link:focus { top: 0; }

/* ─── Container ─────────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w-site);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* ─── Header ─────────────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: var(--header-h);
}
.site-header__logo img { width: 140px; height: auto; }
.site-nav { margin-left: auto; }
.nav__list {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  align-items: center;
}
.nav__link {
  display: block;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}
.nav__link:hover { background: var(--color-bg-alt); color: var(--color-primary); }
.nav__link--active { color: var(--color-primary); background: var(--color-primary-light); }
.site-header__cta { margin-left: 0.5rem; flex-shrink: 0; }
.site-header__menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
}
.site-header__menu-icon,
.site-header__menu-icon::before,
.site-header__menu-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  transition: var(--transition);
}
.site-header__menu-icon { top: 50%; transform: translate(-50%, -50%); }
.site-header__menu-icon::before { content: ''; top: -5px; }
.site-header__menu-icon::after { content: ''; top: 5px; }

/* Mobile menu */
.mobile-menu {
  display: none;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: 1rem 0;
}
.mobile-menu[aria-hidden="false"] { display: block; }
.mobile-menu__list { list-style: none; padding: 0 1.25rem; }
.mobile-menu__list .nav__link { padding: 0.625rem 0.75rem; font-size: 1rem; }
.mobile-menu__cta-item { margin-top: 0.75rem; }

@media (max-width: 900px) {
  .site-nav, .site-header__cta { display: none; }
  .site-header__menu-btn { display: flex; align-items: center; justify-content: center; margin-left: auto; }
}

/* ─── Breadcrumb ─────────────────────────────────────────────────────────────── */
.breadcrumb {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: 0.5rem 0;
  font-size: 0.875rem;
}
.breadcrumb__list {
  display: flex;
  list-style: none;
  flex-wrap: wrap;
  gap: 0.25rem;
  max-width: var(--max-w-site);
  margin-inline: auto;
  padding-inline: 1.25rem;
}
.breadcrumb__item { display: flex; align-items: center; gap: 0.25rem; }
.breadcrumb__item + .breadcrumb__item::before { content: '/'; color: var(--color-text-muted); }
.breadcrumb__link { color: var(--color-primary); text-decoration: none; }
.breadcrumb__link:hover { text-decoration: underline; }
.breadcrumb__item--current { color: var(--color-text-muted); }

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  min-height: 44px;
  white-space: nowrap;
}
.btn--primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn--primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); color: #fff; }
.btn--secondary { background: var(--color-bg); color: var(--color-primary); border-color: var(--color-primary); }
.btn--secondary:hover { background: var(--color-primary-light); }
.btn--outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn--outline:hover { background: var(--color-primary-light); }
.btn--ghost { background: transparent; color: var(--color-text-muted); border-color: transparent; }
.btn--ghost:hover { background: var(--color-bg-alt); color: var(--color-text); }
.btn--sm { padding: 0.375rem 0.875rem; font-size: 0.875rem; min-height: 36px; }
.btn--lg { padding: 0.875rem 1.75rem; font-size: 1.0625rem; min-height: 56px; }
.btn--block { width: 100%; }

/* ─── Hero Section ───────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, #f0f8ff 100%);
  padding: 3.5rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}
.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 3rem;
  align-items: center;
}
.hero__title {
  font-size: clamp(1.625rem, 3vw + 0.5rem, 2.5rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 0.875rem;
}
.hero__lead {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 38ch;
}
.hero__form-wrap {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
}
@media (max-width: 768px) {
  .hero__inner { grid-template-columns: 1fr; gap: 2rem; }
  .hero__lead { max-width: none; }
  .hero { padding: 2rem 0; }
}

/* ─── Shorten Form ───────────────────────────────────────────────────────────── */
.shorten-form__label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.625rem;
}
.shorten-form__row {
  display: flex;
  gap: 0.5rem;
}
.shorten-form__input {
  flex: 1;
  height: 56px;
  padding: 0 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-system);
  transition: border-color var(--transition);
  background: var(--color-bg);
  color: var(--color-text);
}
.shorten-form__input:focus { border-color: var(--color-primary); outline: none; }
.shorten-form__input.is-invalid { border-color: var(--color-error); }
.shorten-form__hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
}
.shorten-form__error {
  background: var(--color-error-bg);
  color: var(--color-error);
  border-left: 3px solid var(--color-error);
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  margin-top: 0.75rem;
  font-size: 0.9rem;
}
.shorten-form__fallback {
  background: var(--color-warning-bg);
  border: 1px solid #D4A017;
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-top: 0.75rem;
}
.shorten-form__fallback-msg { font-weight: 500; margin-bottom: 0.75rem; }
.shorten-form__fallback-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.shorten-form__fallback-input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}
.shorten-form__noscript {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
}
.shorten-form__noscript p { margin-bottom: 0.75rem; }
@media (max-width: 600px) {
  .shorten-form__row { flex-direction: column; }
  .shorten-form__input { height: 52px; }
  .shorten-form__fallback-row { flex-direction: column; }
}

/* ─── Trust Badges ───────────────────────────────────────────────────────────── */
.trust-badges {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 0.875rem 0;
}
.trust-badges__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem 2rem;
}
.trust-badge {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
}
.trust-badge__icon { color: var(--color-secondary); font-weight: 700; }

/* ─── Sections ───────────────────────────────────────────────────────────────── */
.section { padding: 3.5rem 0; }
.section + .section { border-top: 1px solid var(--color-border); }
.section__title {
  font-size: clamp(1.375rem, 2vw + 0.5rem, 1.875rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}
.section__lead {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 55ch;
  margin: 0 auto 2rem;
}
.text-center { text-align: center; }
p.text-center { margin-top: 1.5rem; }

/* ─── Card Grid ─────────────────────────────────────────────────────────────── */
.card-grid {
  display: grid;
  gap: 1.25rem;
  list-style: none;
  margin-top: 2rem;
}
.card-grid--3 { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card-grid--4 { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

/* ─── Task Card ─────────────────────────────────────────────────────────────── */
.task-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.625rem;
  padding: 1.5rem 1rem;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  text-align: center;
}
.task-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-primary);
}
.task-card__icon { font-size: 1.75rem; }
.task-card__label { font-weight: 600; }

/* ─── Steps ──────────────────────────────────────────────────────────────────── */
.steps-list { list-style: none; display: flex; flex-direction: column; gap: 1.5rem; margin-top: 1.5rem; }
.steps-list__item { display: flex; gap: 1.25rem; align-items: flex-start; }
.steps-list__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  min-width: 2.5rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1rem;
}
.steps-list__heading { font-size: 1.0625rem; font-weight: 600; margin-bottom: 0.25rem; }
.steps-section__more { text-align: center; margin-top: 1.5rem; }

/* ─── Feature Grid ───────────────────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  list-style: none;
  margin-top: 2rem;
}
.feature-item {
  padding: 1.25rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.feature-item__title { font-weight: 600; margin-bottom: 0.375rem; }

/* ─── Tool Card ─────────────────────────────────────────────────────────────── */
.tool-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.tool-card--featured { border-color: var(--color-primary); }
.tool-card:hover { box-shadow: var(--shadow-md); }
.tool-card__title { font-size: 1.125rem; font-weight: 700; }
.tool-card__title a { text-decoration: none; color: var(--color-text); }
.tool-card__title a:hover { color: var(--color-primary); }
.tool-card__features { list-style: none; padding-left: 0; font-size: 0.9rem; }
.tool-card__features li { padding: 0.125rem 0; padding-left: 1rem; position: relative; }
.tool-card__features li::before { content: '✓'; position: absolute; left: 0; color: var(--color-secondary); font-weight: 700; }
.tool-card .btn { margin-top: auto; }

/* ─── Mini Card ─────────────────────────────────────────────────────────────── */
.mini-card {
  padding: 1.25rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.mini-card h2, .mini-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.375rem; }
.mini-card p { font-size: 0.9rem; color: var(--color-text-muted); }
.mini-card--link:hover { border-color: var(--color-primary); background: var(--color-primary-light); }
.mini-card--link a { text-decoration: none; color: var(--color-text); }
.mini-card--link:hover a { color: var(--color-primary); }

/* ─── Use Case Grid ─────────────────────────────────────────────────────────── */
.use-case-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  list-style: none;
  margin-top: 1.5rem;
  justify-content: center;
}
.use-case-link {
  display: block;
  padding: 0.625rem 1.25rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  transition: background var(--transition), border-color var(--transition);
}
.use-case-link:hover { background: var(--color-primary-light); border-color: var(--color-primary); color: var(--color-primary); }

/* ─── Stats ──────────────────────────────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  list-style: none;
  text-align: center;
  margin-top: 2rem;
}
.stat-item__value { display: block; font-size: 2rem; font-weight: 800; color: var(--color-primary); }
.stat-item__label { font-size: 0.9rem; color: var(--color-text-muted); }
.stats-section__note { text-align: center; font-size: 0.8125rem; color: var(--color-text-muted); margin-top: 1rem; }

/* ─── Safety Section ─────────────────────────────────────────────────────────── */
.safety-section { background: var(--color-primary-light); }
.safety-section__text { max-width: 640px; }
.safety-section__text h2 { font-size: 1.5rem; margin-bottom: 0.875rem; }
.safety-section__text p { margin-bottom: 0.875rem; }

/* ─── FAQ ────────────────────────────────────────────────────────────────────── */
.faq-list { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 1.5rem; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-btn {
  width: 100%;
  text-align: left;
  padding: 1rem 1.25rem;
  background: var(--color-bg);
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  line-height: 1.4;
  color: var(--color-text);
  transition: background var(--transition);
}
.faq-btn:hover { background: var(--color-bg-alt); }
.faq-btn[aria-expanded="true"] { background: var(--color-primary-light); color: var(--color-primary); }
.faq-btn::after {
  content: '+';
  font-size: 1.25rem;
  line-height: 1;
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-btn[aria-expanded="true"]::after { transform: rotate(45deg); }
.faq-answer {
  padding: 0 1.25rem 1rem;
  font-size: 0.9375rem;
  border-top: 1px solid var(--color-border);
}
.faq-answer p { margin-top: 0.875rem; }
.faq-answer p:first-child { margin-top: 0.75rem; }
.faq-section { padding: 2rem 0; }
.faq-section .container { max-width: var(--max-w-content); }
.faq-section__inner { max-width: var(--max-w-content); margin-inline: auto; }

/* ─── Final CTA ──────────────────────────────────────────────────────────────── */
.final-cta { background: var(--color-primary); color: #fff; }
.final-cta__inner { text-align: center; padding: 1rem 0; }
.final-cta h2 { font-size: 1.75rem; margin-bottom: 0.5rem; }
.final-cta p { font-size: 1.0625rem; margin-bottom: 1.25rem; opacity: 0.9; }
.final-cta .btn--primary { background: #fff; color: var(--color-primary); border-color: #fff; }
.final-cta .btn--primary:hover { background: var(--color-primary-light); }
.final-cta .btn--outline { color: #fff; border-color: rgba(255,255,255,0.6); margin-left: 0.75rem; }
.final-cta .btn--outline:hover { background: rgba(255,255,255,0.15); border-color: #fff; color: #fff; }

/* ─── Footer ─────────────────────────────────────────────────────────────────── */
.site-footer { background: var(--color-text); color: #d1d5db; }
.site-footer__inner {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  padding: 3rem 0 2rem;
}
.site-footer__brand { display: flex; flex-direction: column; gap: 0.75rem; }
.site-footer__logo { display: block; }
.site-footer__tagline { font-size: 0.875rem; color: #9ca3af; }
.site-footer__nav { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 2rem; }
.site-footer__heading { color: #f9fafb; font-size: 0.875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.875rem; }
.site-footer__nav ul { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.site-footer__nav a { color: #9ca3af; text-decoration: none; font-size: 0.9rem; transition: color var(--transition); }
.site-footer__nav a:hover { color: #f9fafb; }
.site-footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 1rem 0;
  font-size: 0.875rem;
  color: #6b7280;
}
.site-footer__bottom a { color: #9ca3af; }
.site-footer__bottom a:hover { color: #f9fafb; }
@media (max-width: 768px) {
  .site-footer__inner { grid-template-columns: 1fr; gap: 2rem; }
}

/* ─── Article ────────────────────────────────────────────────────────────────── */
.content-article { padding: 2.5rem 0; }
.article-container { max-width: var(--max-w-content); }
.article-header { margin-bottom: 2rem; }
.article-header h1 { font-size: clamp(1.5rem, 3vw + 0.5rem, 2.25rem); font-weight: 800; line-height: 1.2; letter-spacing: -0.02em; margin-bottom: 0.75rem; }
.article-lead { font-size: 1.125rem; color: var(--color-text-muted); line-height: 1.65; }
.content-article h2 { font-size: 1.375rem; font-weight: 700; margin: 2rem 0 0.875rem; letter-spacing: -0.01em; }
.content-article h3 { font-size: 1.125rem; font-weight: 600; margin: 1.5rem 0 0.625rem; }
.content-article p { margin-bottom: 0.875rem; }
.content-article ul, .content-article ol { padding-left: 1.5rem; margin-bottom: 0.875rem; }
.content-article li { margin-bottom: 0.375rem; }
.content-article strong { font-weight: 600; }
.content-article section { margin-bottom: 1.5rem; }
.content-article section + section { padding-top: 0.5rem; }

/* ─── TOC ────────────────────────────────────────────────────────────────────── */
.toc {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0 2rem;
}
.toc__title { font-size: 1rem; font-weight: 600; margin-bottom: 0.75rem; }
.toc__list { padding-left: 1.25rem; margin: 0; }
.toc__list li { margin-bottom: 0.375rem; font-size: 0.9375rem; }
.toc__list a { text-decoration: none; }
.toc__list a:hover { text-decoration: underline; }

/* ─── Code ───────────────────────────────────────────────────────────────────── */
code {
  background: #f1f5f9;
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-size: 0.875em;
  color: #c7254e;
}
.code-block {
  display: block;
  background: #1e293b;
  color: #e2e8f0;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  overflow-x: auto;
  margin: 0.75rem 0;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ─── Tables ─────────────────────────────────────────────────────────────────── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9375rem;
  overflow-x: auto;
  display: block;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-border);
}
.data-table th {
  background: var(--color-bg-alt);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.data-table tr:hover td { background: #f8faff; }

/* ─── Checklist ─────────────────────────────────────────────────────────────── */
.checklist { list-style: none; padding-left: 0; }
.checklist li {
  display: flex;
  gap: 0.625rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}
.checklist li:last-child { border-bottom: none; }
.checklist li::before {
  content: '☐';
  color: var(--color-primary);
  font-size: 1.1rem;
  flex-shrink: 0;
  line-height: 1.3;
}

/* ─── Flow Diagram ───────────────────────────────────────────────────────────── */
.flow-diagram {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
  margin: 1rem 0;
}
.flow-step {
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9375rem;
}
.flow-arrow { font-size: 1.25rem; color: var(--color-text-muted); }

/* ─── Screenshot ─────────────────────────────────────────────────────────────── */
.screenshot-wrap {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 0.875rem 0;
}
.screenshot-img {
  width: 100%;
  height: auto;
  display: block;
}

/* ─── CTA Box ────────────────────────────────────────────────────────────────── */
.cta-box {
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.875rem;
  margin: 1.5rem 0;
}
.cta-box p { font-weight: 600; flex: 1; min-width: 140px; margin: 0; }
.article-cta { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--color-border); display: flex; gap: 0.875rem; flex-wrap: wrap; }
.article-related { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--color-border); }
.article-related h2 { font-size: 1.125rem; margin-bottom: 0.75rem; }
.related-links { list-style: none; padding-left: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.related-links li a {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--color-primary);
  transition: background var(--transition);
}
.related-links li a:hover { background: var(--color-primary-light); }

/* ─── Tool Panel ─────────────────────────────────────────────────────────────── */
.tool-panel {
  background: var(--color-bg-alt);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin: 1.5rem 0 2.5rem;
  max-width: var(--max-w-tool);
}
.noscript-notice {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
}
.noscript-notice p { margin-bottom: 0.875rem; }
.info-section { border-top: 2px solid var(--color-border); padding-top: 2rem; }
.info-section h2 { font-size: 1.375rem; font-weight: 700; margin: 2rem 0 0.875rem; }
.info-section h2:first-child { margin-top: 0; }

/* ─── Forms ──────────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; font-weight: 600; font-size: 0.9375rem; margin-bottom: 0.375rem; }
.form-label--optional { font-weight: 400; color: var(--color-text-muted); font-size: 0.875em; }
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-system);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition);
  min-height: 44px;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-primary);
  outline: none;
}
.form-input.is-invalid, .form-select.is-invalid, .form-textarea.is-invalid {
  border-color: var(--color-error);
}
.form-textarea { resize: vertical; min-height: 80px; line-height: 1.5; }
.form-hint { font-size: 0.8125rem; color: var(--color-text-muted); margin-top: 0.25rem; }
.form-error {
  background: var(--color-error-bg);
  color: var(--color-error);
  border-left: 3px solid var(--color-error);
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}
.form-row { display: grid; gap: 1rem; }
.form-row--2col { grid-template-columns: 1fr 1fr; }
.form-row--3col { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 600px) {
  .form-row--2col, .form-row--3col { grid-template-columns: 1fr; }
}
.form-options { display: flex; flex-direction: column; gap: 0.5rem; margin: 0.75rem 0; }
.checkbox-label { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; cursor: pointer; }
.checkbox-label input { width: auto; min-height: auto; }

/* ─── Tool Results ───────────────────────────────────────────────────────────── */
.tool-result { margin-top: 1.25rem; }
.result-row { display: flex; gap: 0.5rem; margin-top: 0.5rem; }
.result-input { flex: 1; font-family: var(--font-mono); font-size: 0.875rem; background: #f8faff; }
.result-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.875rem; }
.result-preview { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 1rem; margin-bottom: 0.75rem; }
.result-code {
  background: #f1f5f9;
  border-radius: var(--radius-sm);
  padding: 0.625rem 0.875rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  word-break: break-all;
  margin-top: 0.5rem;
  color: var(--color-text);
}
.result-code--clean { background: var(--color-success-bg); color: var(--color-success); }
.result-placeholder { color: var(--color-text-muted); font-style: italic; font-family: var(--font-system); }
.copy-status {
  font-size: 0.875rem;
  min-height: 1.5rem;
  color: var(--color-success);
  font-weight: 500;
}
@media (max-width: 600px) {
  .result-row { flex-direction: column; }
  .result-actions { flex-direction: column; }
  .result-actions .btn { width: 100%; }
}

/* ─── Cleaner Tool ───────────────────────────────────────────────────────────── */
.cleaner-comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
.cleaner-col__title { font-size: 0.875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 0.5rem; color: var(--color-text-muted); }
.cleaner-summary { background: var(--color-success-bg); color: var(--color-success); padding: 0.625rem 0.875rem; border-radius: var(--radius-sm); margin-bottom: 0.75rem; font-size: 0.9rem; font-weight: 500; }
@media (max-width: 600px) { .cleaner-comparison { grid-template-columns: 1fr; } }

/* ─── WhatsApp Tool ──────────────────────────────────────────────────────────── */
.tool-preview {
  margin-top: 1rem;
  padding: 1rem;
  background: #e7f8e7;
  border-radius: var(--radius-md);
  border: 1px solid #a3d9a5;
  font-size: 0.9rem;
  display: none;
}
.tool-preview.is-visible { display: block; }

/* ─── UTM Presets ────────────────────────────────────────────────────────────── */
.utm-presets { margin-bottom: 1rem; }
.preset-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.5rem; }
.preset-btn { font-size: 0.8125rem; }

/* ─── Message Examples ───────────────────────────────────────────────────────── */
.message-examples { display: flex; flex-direction: column; gap: 0.875rem; margin: 0.875rem 0; }
.message-example {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-secondary);
  border-radius: var(--radius-sm);
  padding: 0.875rem 1rem;
}
.message-example--bad { border-left-color: var(--color-error); }
.message-example p { margin-bottom: 0.25rem; }
.message-example footer { font-size: 0.8125rem; color: var(--color-text-muted); margin-top: 0.375rem; }

/* ─── Example List ───────────────────────────────────────────────────────────── */
.example-list { display: flex; flex-direction: column; gap: 0.75rem; margin: 0.875rem 0; }
.example-item { background: var(--color-bg-alt); border-radius: var(--radius-sm); padding: 0.875rem 1rem; }
.example-item dt { font-weight: 600; font-size: 0.875rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--color-text-muted); margin-bottom: 0.25rem; }
.example-item dd code { font-size: 0.9rem; color: var(--color-text); background: var(--color-bg); padding: 0.25em 0.5em; }

/* ─── Error Items (Erros page) ───────────────────────────────────────────────── */
.error-item {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.error-item h3 { font-size: 1.0625rem; font-weight: 700; margin-bottom: 0.625rem; color: var(--color-text); }
.error-item p { margin-bottom: 0.375rem; font-size: 0.9375rem; }

/* ─── Error 404 page ─────────────────────────────────────────────────────────── */
.error-page { max-width: 560px; margin: 4rem auto; text-align: center; padding: 0 1rem; }
.error-page h1 { font-size: 2rem; font-weight: 800; margin-bottom: 0.875rem; }
.error-page__lead { font-size: 1.125rem; color: var(--color-text-muted); margin-bottom: 2rem; }
.error-page__links { text-align: left; display: inline-block; margin-bottom: 2rem; }
.error-page__links h2 { font-size: 1.125rem; margin-bottom: 0.75rem; }

/* ─── Page wrapper ───────────────────────────────────────────────────────────── */
.page-wrapper { min-height: calc(100vh - var(--header-h) - 200px); }

/* ─── Responsive Typography ──────────────────────────────────────────────────── */
@media (max-width: 480px) {
  .tool-panel { padding: 1.25rem; }
  .hero__form-wrap { padding: 1.25rem; }
  .data-table { font-size: 0.875rem; }
  .data-table th, .data-table td { padding: 0.5rem 0.625rem; }
}

/* ─── Print ──────────────────────────────────────────────────────────────────── */
@media print {
  .site-header, .site-footer, .breadcrumb, .article-cta { display: none; }
  body { font-size: 12pt; }
}