:root {
  color-scheme: light;
  --ink: #0a1730;
  --muted: #5f6b7b;
  --line: #d8dfe8;
  --paper: #f4f6f9;
  --blue: #1265f3;
}

* { box-sizing: border-box; }

html {
  background: var(--paper);
  line-break: strict;
  word-break: normal;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(11, 31, 67, .035) 1px, transparent 1px) 0 0 / 80px 80px,
    linear-gradient(rgba(11, 31, 67, .035) 1px, transparent 1px) 0 0 / 80px 80px,
    var(--paper);
  font-family: "Source Han Sans CN", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  overflow-wrap: break-word;
}

a { color: inherit; }
p, li { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }

.review-header {
  max-width: 1540px;
  margin: 0 auto;
  padding: 92px 56px 68px;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(300px, .65fr);
  gap: 80px;
  align-items: end;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--blue);
  font: 600 12px/1.2 Bahnschrift, "Arial Narrow", sans-serif;
  letter-spacing: .22em;
}

.review-header h1 {
  margin: 0;
  max-width: 900px;
  font: 760 clamp(54px, 6.8vw, 106px)/1 "Source Han Sans CN", "Microsoft YaHei", Bahnschrift, sans-serif;
  letter-spacing: -.018em;
}

.lede {
  max-width: 800px;
  margin: 34px 0 0;
  color: #445169;
  font-size: 18px;
  line-height: 1.85;
}

.review-header aside {
  border-top: 3px solid var(--ink);
  padding-top: 18px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 24px;
  font-size: 13px;
}

.review-header aside span { color: #778295; }
.review-header aside strong { font-weight: 650; }

.review-grid {
  width: min(100% - 48px, 1540px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.concept-card {
  --accent: #1468f3;
  position: relative;
  min-width: 0;
  padding: 30px;
  overflow: hidden;
  border: 1px solid rgba(12, 29, 58, .12);
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 30px 70px rgba(11, 31, 67, .08);
}

.concept-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 4px;
  background: var(--accent);
}

.concept-qin { --accent: #a74c28; }
.concept-engine { --accent: #ff542e; }
.concept-horizon { --accent: #3155be; }

.concept-meta {
  margin-bottom: 24px;
  display: flex;
  gap: 18px;
  align-items: center;
}

.concept-index {
  color: var(--accent);
  font: 700 28px/1 Bahnschrift, sans-serif;
  letter-spacing: -.04em;
}

.concept-meta p {
  margin: 0 0 4px;
  color: #6e798a;
  font-size: 12px;
}

.concept-meta h2 {
  margin: 0;
  font-size: 26px;
  line-height: 1.1;
}

.preview-shell {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #dce4ef;
  border: 1px solid rgba(11, 31, 67, .08);
}

.preview-shell iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 1440px;
  height: 810px;
  border: 0;
  transform: scale(var(--preview-scale, .489));
  transform-origin: left top;
  pointer-events: none;
}

.concept-copy {
  min-height: 64px;
  margin: 24px 0 26px;
  color: #526074;
  font-size: 14px;
  line-height: 1.75;
}

.concept-card > a {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.concept-card > a span {
  transition: transform .25s ease;
}

.concept-card > a:hover span { transform: translate(4px, -4px); }

.review-notes {
  width: min(100% - 48px, 1540px);
  margin: 84px auto;
  padding: 56px;
  color: white;
  background: #0b1d3a;
  display: grid;
  grid-template-columns: .65fr 1.35fr;
  gap: 80px;
}

.review-notes h2 {
  max-width: 420px;
  margin: 0;
  font-size: clamp(36px, 4vw, 62px);
  line-height: 1.05;
  letter-spacing: -.015em;
}

.review-notes ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.review-notes li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 4px 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, .18);
}

.review-notes li > span {
  grid-row: 1 / span 2;
  color: #74a1ff;
  font: 600 15px/1.4 Bahnschrift, sans-serif;
}

.review-notes strong { font-size: 18px; }

.review-notes li p {
  margin: 5px 0 0;
  color: #aebbd0;
  font-size: 14px;
  line-height: 1.65;
}

.review-footer {
  width: min(100% - 48px, 1540px);
  margin: 0 auto;
  padding: 30px 0 50px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-size: 13px;
}

.review-footer a { color: var(--blue); }

@media (max-width: 1100px) {
  .review-header { grid-template-columns: 1fr; gap: 40px; }
  .review-grid { grid-template-columns: 1fr; }
  .preview-shell iframe { transform: scale(var(--preview-scale, .68)); }
  .review-notes { grid-template-columns: 1fr; gap: 50px; }
}

@media (max-width: 720px) {
  .review-header { padding: 60px 24px 44px; }
  .review-grid, .review-notes, .review-footer { width: calc(100% - 28px); }
  .review-header h1 { font-size: 55px; }
  .concept-card { padding: 20px; }
  .concept-copy { min-height: 0; }
  .preview-shell iframe { transform: scale(var(--preview-scale, .34)); }
  .review-notes { margin: 54px auto; padding: 32px 24px; }
  .review-footer { flex-direction: column; }
}