:root {
  color-scheme: light;
  --ink: #243126;
  --muted: #6d766b;
  --line: #d6ddcf;
  --paper: #fffdf3;
  --leaf: #5c7e4d;
  --gold: #c99225;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 90% 0%, rgba(211, 231, 181, .36), transparent 27rem),
    var(--paper);
  color: var(--ink);
  font-family: "Noto Serif SC", "Songti SC", Georgia, serif;
  line-height: 1.75;
}

.page-shell { width: min(100% - 36px, 960px); margin: 0 auto; padding: 42px 0 32px; }
.site-header { position: relative; padding: 16px 0 28px; }
.eyebrow, .section-label { margin: 0 0 10px; color: var(--leaf); font: 700 11px/1.4 Arial, sans-serif; letter-spacing: .22em; }
h1 { margin: 0; font-size: clamp(42px, 7vw, 78px); line-height: 1; letter-spacing: .08em; font-weight: 800; }
.subtitle { margin: 18px 0 0; color: var(--muted); font-size: 16px; letter-spacing: .12em; }
hr { border: 0; border-top: 1px solid var(--line); margin: 0; }
.product-hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(180px, .75fr); gap: clamp(26px, 7vw, 86px); align-items: end; padding: 36px 0 42px; }
.image-frame { position: relative; overflow: hidden; background: #e8efd9; }
.image-frame img { display: block; width: 100%; max-height: 540px; object-fit: cover; aspect-ratio: 1.28 / 1; }
.image-tag { position: absolute; left: 18px; bottom: 18px; padding: 5px 10px; background: rgba(255,253,243,.9); color: var(--leaf); font: 700 11px Arial, sans-serif; letter-spacing: .16em; }
.hero-note { border-left: 2px solid var(--gold); padding: 0 0 8px 24px; max-width: 240px; }
.note-mark { display: block; color: var(--gold); font: 700 12px Arial, sans-serif; letter-spacing: .15em; }
.hero-note p { margin: 14px 0 0; font-size: 20px; line-height: 1.75; }
.intro { max-width: 720px; padding: 42px 0 18px; }
.intro h2 { margin: 0 0 22px; font-size: clamp(28px, 4vw, 42px); line-height: 1.2; }
.intro p:not(.section-label) { margin: 0 0 18px; color: #445044; font-size: 17px; }
.intro strong { color: var(--leaf); }
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 28px 0 36px; background: var(--line); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-list article { min-height: 174px; padding: 22px 20px; background: var(--paper); }
.feature-list span { color: var(--gold); font: 700 11px Arial, sans-serif; letter-spacing: .12em; }
.feature-list h3 { margin: 17px 0 6px; font-size: 21px; }
.feature-list p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
footer { padding-top: 5px; color: #7b8278; letter-spacing: .04em; }

@media (max-width: 650px) {
  .page-shell { width: min(100% - 28px, 520px); padding-top: 24px; }
  .product-hero { grid-template-columns: 1fr; gap: 24px; padding: 24px 0 30px; }
  .hero-note { max-width: none; }
  .hero-note p { font-size: 18px; }
  .feature-list { grid-template-columns: 1fr; }
  .feature-list article { min-height: auto; }
}