:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --ink: #191f28;
  --muted: #4e5968;
  --line: #dce3ee;
  --primary: #3182f6;
  --primary-strong: #0f5fce;
  --green: #0b8f62;
  --red: #c2413f;
  --yellow: #f2b705;
  --shadow: 0 18px 48px rgba(25, 31, 40, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  line-height: 1.65;
}

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

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.hero {
  min-height: 92vh;
  background:
    linear-gradient(135deg, rgba(49, 130, 246, 0.16), rgba(11, 143, 98, 0.13)),
    radial-gradient(circle at top right, rgba(242, 183, 5, 0.2), transparent 30%),
    var(--bg);
  border-bottom: 1px solid var(--line);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 24px;
  backdrop-filter: blur(16px);
}

.brand {
  font-size: 18px;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.nav-links a:hover {
  color: var(--primary-strong);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.68fr);
  gap: 42px;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: 80px 24px 120px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary-strong);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(44px, 8vw, 86px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 21px;
  line-height: 1.25;
}

.lead {
  max-width: 690px;
  color: var(--muted);
  font-size: 19px;
}

.hero-actions,
.footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 18px;
  font-weight: 800;
  cursor: pointer;
}

.button.primary {
  background: var(--primary);
  color: #fff;
}

.button.ghost {
  background: rgba(255, 255, 255, 0.56);
  border-color: var(--line);
  color: var(--ink);
}

.decision-panel,
.comparison article,
.scope-card,
.screen-card,
.reason-card,
.architecture-grid article,
.api-box,
.roadmap article,
.checklist {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.decision-panel {
  padding: 24px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 22px;
  color: var(--muted);
}

.panel-header strong {
  color: var(--ink);
}

.metric-list {
  display: grid;
  gap: 12px;
}

.metric-list div {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 16px;
  background: var(--surface-soft);
  border-radius: 8px;
}

.metric-list span,
.metric-list strong {
  display: block;
}

.metric-list span {
  color: var(--muted);
  font-size: 14px;
}

.metric-list strong {
  font-size: 20px;
}

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 92px 24px 0;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 30px;
}

.comparison,
.scope-grid,
.screen-grid,
.score-layout,
.architecture-grid,
.roadmap {
  display: grid;
  gap: 18px;
}

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

.comparison article,
.scope-card,
.screen-card,
.architecture-grid article,
.roadmap article {
  padding: 26px;
}

.comparison article.highlight {
  border-color: rgba(49, 130, 246, 0.45);
  background: linear-gradient(180deg, #ffffff, #f3f8ff);
}

ul {
  margin: 16px 0 0;
  padding-left: 20px;
}

li {
  margin: 6px 0;
}

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

.scope-card.include {
  border-top: 5px solid var(--green);
}

.scope-card.exclude {
  border-top: 5px solid var(--red);
}

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

.flow-list li {
  counter-increment: flow;
  display: grid;
  grid-template-columns: 58px minmax(150px, 220px) 1fr;
  gap: 18px;
  align-items: center;
  margin: 0;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.flow-list li::before {
  content: counter(flow, decimal-leading-zero);
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: #fff;
  border-radius: 8px;
  font-weight: 900;
}

.flow-list strong {
  font-size: 18px;
}

.flow-list span {
  color: var(--muted);
}

.screen-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tab-label {
  display: inline-flex;
  margin-bottom: 16px;
  padding: 5px 10px;
  background: var(--surface-soft);
  color: var(--primary-strong);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 900;
}

.score-layout {
  grid-template-columns: minmax(280px, 0.95fr) minmax(320px, 1fr);
  align-items: start;
}

.score-bars {
  display: grid;
  gap: 12px;
}

.score-bars div {
  --value: attr(data-score number);
  display: grid;
  grid-template-columns: 1fr 52px;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: calc(var(--bar, 1) * 1px) solid var(--primary);
  border-radius: 8px;
}

.score-bars div[data-score="25"] {
  --bar: 25;
}

.score-bars div[data-score="20"] {
  --bar: 20;
}

.score-bars div[data-score="15"] {
  --bar: 15;
}

.score-bars div[data-score="10"] {
  --bar: 10;
}

.score-bars div[data-score="5"] {
  --bar: 5;
}

.score-bars strong {
  color: var(--primary-strong);
  text-align: right;
}

.reason-card {
  padding: 26px;
}

pre {
  overflow: auto;
  margin: 18px 0 0;
  padding: 18px;
  background: #111827;
  color: #e7eef9;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.55;
}

.architecture-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.architecture-grid code,
.api-box code {
  display: inline-flex;
  margin-top: 10px;
  padding: 4px 8px;
  background: var(--surface-soft);
  color: var(--primary-strong);
  border-radius: 6px;
  font-size: 13px;
}

.api-box {
  margin-top: 18px;
  padding: 26px;
}

.table-wrap {
  overflow: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

th,
td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-soft);
  font-size: 14px;
}

tr:last-child td {
  border-bottom: 0;
}

.roadmap {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.roadmap span {
  color: var(--primary-strong);
  font-size: 13px;
  font-weight: 900;
}

.checklist {
  display: grid;
  gap: 4px;
  padding: 18px;
}

.checklist label {
  display: flex;
  gap: 12px;
  align-items: center;
  min-height: 44px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
}

.checklist label:hover {
  background: var(--surface-soft);
}

.checklist input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

.checklist input:checked + span {
  color: var(--muted);
  text-decoration: line-through;
}

.footer {
  justify-content: space-between;
  max-width: 1180px;
  margin: 0 auto;
  padding: 74px 24px 42px;
  color: var(--muted);
}

@media (max-width: 900px) {
  .hero-grid,
  .comparison,
  .scope-grid,
  .score-layout {
    grid-template-columns: 1fr;
  }

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

  .flow-list li {
    grid-template-columns: 48px 1fr;
  }

  .flow-list span {
    grid-column: 2;
  }
}

@media (max-width: 640px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .hero-grid {
    padding-top: 42px;
    padding-bottom: 72px;
  }

  .section {
    padding-top: 68px;
  }

  .screen-grid,
  .architecture-grid,
  .roadmap {
    grid-template-columns: 1fr;
  }

  .flow-list li {
    grid-template-columns: 1fr;
  }

  .flow-list span {
    grid-column: auto;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
  }
}