:root {
  --bg: #f6f8fb;
  --paper: #ffffff;
  --ink: #111827;
  --muted: #5f6b7a;
  --line: #d9e2ef;
  --violet: #6d28d9;
  --violet-dark: #4c1d95;
  --violet-soft: #eee7ff;
  --teal: #0f766e;
  --amber: #d97706;
  --shadow: 0 18px 50px rgba(17, 24, 39, 0.14);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  letter-spacing: 0;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(20px, 4vw, 56px);
  background: rgba(246, 248, 251, 0.88);
  border-bottom: 1px solid rgba(217, 226, 239, 0.9);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--ink);
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: var(--violet);
  color: #fff;
  font-size: 15px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.nav-links a:hover,
.text-link:hover {
  color: var(--violet);
}

.header-cta {
  padding: 10px 15px;
  border: 1px solid var(--violet);
  border-radius: 6px;
  color: var(--violet);
  font-size: 14px;
  font-weight: 800;
}

.section-shell {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(520px, 1.18fr);
  align-items: center;
  gap: clamp(34px, 5vw, 72px);
  padding: 34px 0 20px;
}

.hero-copy h1 {
  max-width: 640px;
  margin: 0;
  font-size: clamp(36px, 4.7vw, 56px);
  line-height: 1;
  letter-spacing: 0;
  color: var(--ink);
}

.hero-copy p {
  max-width: 610px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 850;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--violet);
  color: #fff;
  box-shadow: 0 10px 26px rgba(109, 40, 217, 0.22);
}

.button.primary:hover {
  background: var(--violet-dark);
}

.button.secondary {
  background: var(--paper);
  border-color: var(--line);
  color: var(--ink);
}

.button.wide {
  width: 100%;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 610px;
  margin: 18px 0 0;
}

.hero-facts div {
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.hero-facts dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero-facts dd {
  margin: 6px 0 0;
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
}

.hero-media {
  margin: 0;
  border: 1px solid #c9d6e8;
  border-radius: var(--radius);
  background: #e7edf8;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-media img {
  width: 100%;
  height: auto;
}

.problem-band,
.pricing-band {
  background: #111827;
  color: #fff;
}

.problem-band {
  padding: 72px 0;
}

.split,
.pricing-layout,
.screenshot-layout,
.demo-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(32px, 5vw, 70px);
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

.problem-band p,
.pricing-copy p,
.section-heading p,
.screenshot-copy p,
.demo-copy p {
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 17px;
  line-height: 1.7;
}

.check-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.check-list li {
  padding: 14px 16px;
  border-left: 3px solid var(--teal);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: rgba(255, 255, 255, 0.86);
}

.comparison-section {
  padding: 84px 0 72px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff 0%, #f7fbfc 100%);
  box-shadow: 0 18px 44px rgba(17, 24, 39, 0.08);
}

.sample-card {
  display: grid;
  align-content: start;
  gap: 8px;
  min-height: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: none;
}

.sample-card span,
.trust-grid h3::before {
  color: var(--amber);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sample-card h3 {
  margin: 0;
  font-size: 18px;
}

.sample-card p {
  margin: 0;
  color: #263241;
  font-size: 16px;
  line-height: 1.62;
}

.source-sample {
  border-color: #c8dfda;
  background: #f7fffd;
  grid-column: 1 / -1;
  min-height: auto;
}

.flat-sample {
  border-color: #ead6b6;
  background: #fffaf2;
}

.lingo-sample {
  border-color: #cbc0f6;
  background: #fbf9ff;
}

.comparison-note {
  max-width: 780px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.chatgpt-section {
  padding: 70px 0;
  background: #e9f0f8;
}

.chatgpt-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 4vw, 54px);
  align-items: center;
}

.chatgpt-layout p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}

.reason-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.reason-list article {
  padding: 18px;
  border: 1px solid #c9d6e8;
  border-radius: var(--radius);
  background: var(--paper);
}

.reason-list h3 {
  margin: 0;
  font-size: 17px;
}

.reason-list p {
  font-size: 15px;
}

.feature-section,
.workflow-section,
.faq-section,
.guide-section,
.trust-section {
  padding: 92px 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading p,
.screenshot-copy p {
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article {
  min-height: 174px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.feature-grid h3,
.workflow-list h3 {
  margin: 0;
  font-size: 19px;
}

.feature-grid p,
.workflow-list p,
.faq-list p,
.trust-grid p,
.price-panel li {
  color: var(--muted);
  line-height: 1.65;
}

.screenshot-section {
  padding: 86px 0;
  background: #e9f0f8;
}

.screenshot-copy {
  max-width: 460px;
}

.text-link {
  display: inline-flex;
  margin-top: 22px;
  color: var(--violet);
  font-weight: 850;
}

.screen-frame {
  margin: 0;
  border: 1px solid #c9d6e8;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper);
  box-shadow: 0 18px 42px rgba(17, 24, 39, 0.12);
}

.demo-section {
  padding: 86px 0;
  background: #111827;
  color: #fff;
}

.demo-copy {
  max-width: 520px;
}

.demo-copy h2 {
  margin-top: 12px;
}

.demo-points {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.demo-points li {
  padding: 12px 14px;
  border-left: 3px solid #14b8a6;
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(255, 255, 255, 0.07);
  color: rgba(255, 255, 255, 0.88);
  font-weight: 700;
}

.light-link {
  color: #99f6e4;
}

.light-link:hover {
  color: #ccfbf1;
}

.video-frame {
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  background: #000;
  box-shadow: 0 22px 56px rgba(0, 0, 0, 0.28);
  overflow: hidden;
}

.video-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.workflow-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.workflow-list li {
  display: grid;
  gap: 16px;
  align-content: start;
  min-height: 260px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.workflow-list span {
  color: var(--amber);
  font-weight: 900;
  font-size: 13px;
}

.guide-section {
  background: #edf7f5;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.guide-grid a {
  display: grid;
  gap: 10px;
  min-height: 210px;
  padding: 24px;
  border: 1px solid #c8dfda;
  border-radius: var(--radius);
  background: var(--paper);
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.guide-grid a:hover,
.article-list a:hover {
  transform: translateY(-2px);
  border-color: var(--teal);
  box-shadow: 0 14px 32px rgba(17, 24, 39, 0.1);
}

.guide-grid span,
.eyebrow {
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.guide-grid strong {
  color: var(--ink);
  font-size: 20px;
  line-height: 1.25;
}

.guide-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.guide-link {
  margin-top: 24px;
}

.pricing-band {
  padding: 82px 0;
}

.price-panel {
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
}

.price-row {
  display: flex;
  align-items: end;
  gap: 12px;
}

.price {
  font-size: 58px;
  line-height: 0.95;
  font-weight: 900;
}

.price-note {
  padding-bottom: 8px;
  color: var(--muted);
  font-weight: 800;
}

.launch-note {
  margin: 16px 0 20px;
  color: var(--amber);
  font-weight: 750;
}

.price-panel ul {
  margin: 22px 0 0;
  padding-left: 20px;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.trust-grid article {
  min-height: 220px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.trust-grid h3 {
  margin: 0 0 12px;
  font-size: 19px;
}

.trust-grid h3::before {
  content: "Trust";
  display: block;
  margin-bottom: 10px;
}

.trust-grid p {
  margin: 0;
}

.faq-section h2 {
  max-width: 720px;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.faq-list summary {
  cursor: pointer;
  padding: 18px 20px;
  font-weight: 850;
}

.faq-list p {
  margin: 0;
  padding: 0 20px 20px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 4vw, 56px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.article-index {
  padding: 78px 0 96px;
}

.article-index h1,
.article-page h1 {
  max-width: 860px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.04;
  letter-spacing: 0;
}

.article-lead {
  max-width: 820px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.72;
}

.article-list {
  margin-top: 42px;
}

.article-list h2 {
  margin-bottom: 16px;
  font-size: 28px;
}

.article-list a {
  display: grid;
  gap: 8px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.article-list a + a {
  margin-top: 12px;
}

.article-list span {
  color: var(--ink);
  font-size: 19px;
  font-weight: 850;
}

.article-list p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.article-page {
  width: min(820px, calc(100% - 40px));
  margin: 0 auto;
  padding: 76px 0 104px;
}

.article-page article {
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: 0 18px 44px rgba(17, 24, 39, 0.08);
}

.article-page h2 {
  margin-top: 42px;
  font-size: 30px;
  line-height: 1.18;
}

.article-page p,
.article-page li {
  color: #374151;
  font-size: 17px;
  line-height: 1.78;
}

.article-page p {
  margin: 18px 0 0;
}

.article-page ol {
  padding-left: 24px;
}

.article-cta {
  padding: 20px 22px;
  border-left: 4px solid var(--violet);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--violet-soft);
  font-weight: 700;
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .hero,
  .split,
  .chatgpt-layout,
  .pricing-layout,
  .screenshot-layout,
  .demo-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 0;
    padding-top: 42px;
  }

  .feature-grid,
  .guide-grid,
  .comparison-grid,
  .workflow-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .trust-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 14px 18px;
  }

  .header-cta {
    display: none;
  }

  .section-shell {
    width: min(100% - 28px, 1160px);
  }

  .hero-copy h1 {
    font-size: 42px;
  }

  .hero-facts,
  .feature-grid,
  .guide-grid,
  .comparison-grid,
  .reason-list,
  .trust-grid,
  .workflow-list {
    grid-template-columns: 1fr;
  }

  .article-page {
    width: min(100% - 28px, 820px);
    padding: 46px 0 72px;
  }

  .article-page article {
    padding: 26px 20px;
  }

  .site-footer {
    flex-direction: column;
  }
}