@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Source+Serif+4:wght@400;600&display=swap');

:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --accent: #334155;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

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

.page-shell {
  min-height: 100vh;
}

.container {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
}

.brand img {
  height: 30px;
  width: auto;
}

.top-links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.ghost-link,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}

.ghost-link {
  color: var(--muted);
}

.ghost-link:hover {
  color: var(--text);
  background: #f8fafc;
}

.button-link {
  color: #ffffff;
  background: #0f172a;
}

.button-link:hover {
  background: #1e293b;
}

.article-hero {
  padding: 56px 0 28px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: 40px;
  align-items: start;
  margin-top: 22px;
}

.hero-copy,
.hero-panel,
.content-panel,
.sidebar-panel,
.resource-card,
.cta-band,
.summary-grid article,
.faq-item {
  background: transparent;
  border: 0;
  box-shadow: none;
  backdrop-filter: none;
}

.hero-copy {
  padding: 0 0 20px;
}

.hero-panel {
  padding: 0;
}

.hero-copy h1 {
  margin: 16px 0 16px;
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: -0.07em;
  max-width: 14ch;
}

.font-serif {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
}

.lede {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.75;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.meta-pill {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-panel h2,
.sidebar-panel h2,
.resource-copy h2,
.cta-copy h2 {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-panel p,
.hero-panel li,
.sidebar-panel li,
.resource-copy p,
.cta-copy p {
  color: var(--muted);
  line-height: 1.75;
}

.hero-panel ul,
.sidebar-panel ul,
.content-panel ul {
  margin: 0;
  padding-left: 18px;
}

.hero-panel li + li,
.sidebar-panel li + li,
.content-panel li + li {
  margin-top: 10px;
}

.summary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.summary-grid article {
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.summary-grid article:first-child {
  padding-top: 0;
  border-top: 0;
}

.summary-grid h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: -0.03em;
}

.summary-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 44px;
  align-items: start;
  padding: 24px 0 72px;
}

.sidebar-panel {
  position: sticky;
  top: 96px;
  padding-top: 8px;
}

.sidebar-panel nav {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.sidebar-panel nav a {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.sidebar-panel nav a:hover {
  color: var(--text);
}

.content-panel {
  padding: 0;
}

.content-panel section + section {
  margin-top: 34px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.content-panel h2 {
  margin: 0 0 12px;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  letter-spacing: -0.05em;
}

.content-panel h3 {
  margin: 20px 0 10px;
  font-size: 1.08rem;
  letter-spacing: -0.03em;
}

.content-panel p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.82;
}

.key-points {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.key-point {
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
}

.key-point strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  color: var(--text);
}

.comparison-table {
  overflow-x: auto;
  margin-top: 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.comparison-table table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
  padding: 14px 0;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.comparison-table th {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.comparison-table td {
  color: var(--muted);
  line-height: 1.7;
  padding-right: 18px;
}

.comparison-table td:first-child {
  width: 24%;
  color: var(--text);
  font-weight: 600;
}

.compare-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}

.compare-status {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.2;
}

.compare-status--yes {
  color: #166534;
  background: #f0fdf4;
  border-color: #bbf7d0;
}

.compare-status--no {
  color: #b91c1c;
  background: #fef2f2;
  border-color: #fecaca;
}

.compare-status--partial {
  color: #92400e;
  background: #fffbeb;
  border-color: #fde68a;
}

.compare-note {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.faq-list {
  display: grid;
  gap: 20px;
  margin-top: 18px;
}

.faq-item {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.faq-item h3 {
  margin: 0 0 8px;
}

.faq-item p:last-child {
  margin-bottom: 0;
}

.resource-section {
  padding: 0 0 72px;
  border-top: 1px solid var(--line);
}

.resource-copy {
  margin-bottom: 24px;
  padding-top: 28px;
}

.resource-copy h2 {
  margin: 0 0 10px;
  color: var(--text);
  font-size: 28px;
  letter-spacing: -0.05em;
  text-transform: none;
}

.resource-copy p {
  margin: 0;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.resource-card {
  display: block;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.resource-card:hover h3 {
  color: #1e293b;
}

.resource-label {
  display: inline-block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.resource-card h3 {
  margin: 12px 0 10px;
  font-size: 22px;
  letter-spacing: -0.04em;
}

.resource-card p {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.72;
}

.resource-card span:last-child {
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
}

.cta-band {
  margin: 0 0 72px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.cta-copy h2 {
  margin: 0 0 10px;
  color: var(--text);
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.05em;
  text-transform: none;
}

.cta-copy p {
  margin: 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #ffffff;
  padding: 26px 0 38px;
}

.site-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer p,
.site-footer a {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.site-footer-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .hero-grid,
  .article-layout,
  .resource-grid,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .sidebar-panel {
    position: static;
    padding-top: 0;
  }

  .cta-band,
  .site-header-inner,
  .site-footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 720px) {
  .site-header-inner {
    min-height: auto;
    padding: 12px 0;
    gap: 12px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .top-links {
    width: auto;
    gap: 8px;
    margin-left: auto;
  }

  .ghost-link,
  .button-link {
    padding: 9px 12px;
    font-size: 13px;
    white-space: nowrap;
  }

  .button-link {
    margin-left: auto;
  }

  .top-links .ghost-link {
    display: none;
  }

  .comparison-table {
    overflow: visible;
    border-bottom: 0;
  }

  .comparison-table table,
  .comparison-table tbody,
  .comparison-table tr,
  .comparison-table td {
    display: block;
    width: 100%;
    min-width: 0;
  }

  .comparison-table thead {
    display: none;
  }

  .comparison-table tr {
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
  }

  .comparison-table td {
    padding: 0;
    border: 0;
  }

  .comparison-table td + td {
    margin-top: 14px;
  }

  .comparison-table td:first-child {
    width: 100%;
    color: var(--text);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    line-height: 1.5;
    text-transform: uppercase;
  }

  .comparison-table td:nth-child(2)::before,
  .comparison-table td:nth-child(3)::before {
    display: block;
    margin-bottom: 4px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .comparison-table td:nth-child(2)::before {
    content: "InboxMail";
  }

  .comparison-table td:nth-child(3)::before {
    content: "Alternative";
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 24px, 1080px);
  }

  .article-hero {
    padding-top: 34px;
  }

  .hero-copy h1 {
    font-size: clamp(2.2rem, 13vw, 3.4rem);
  }

  .lede,
  .content-panel p {
    font-size: 16px;
  }
}

@media (max-width: 520px) {
  .button-link {
    margin-left: 0;
  }
}