:root {
  --ink: #20231f;
  --paper: #efe9db;
  --cream: #f8f3e7;
  --red: #d84b36;
  --sage: #657c69;
  --line: rgba(32, 35, 31, .24);
}

* { box-sizing: border-box; }
html { background: #d8d0be; color: var(--ink); }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Georgia, "Songti SC", "SimSun", serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(255,255,255,.45) 0 1px, transparent 2px),
    linear-gradient(100deg, rgba(80,60,30,.035) 50%, transparent 50%),
    var(--paper);
  background-size: 19px 19px, 7px 100%;
}

button { font: inherit; }
.masthead {
  min-height: 220px;
  padding: 48px clamp(24px, 7vw, 100px) 36px;
  display: grid;
  grid-template-columns: 76px minmax(210px, .8fr) minmax(280px, 1fr);
  align-items: end;
  gap: 28px;
  border-bottom: 1px solid var(--line);
}
.brand-mark { height: 100px; display: flex; gap: 7px; align-items: flex-end; }
.brand-mark i { width: 17px; display: block; background: var(--red); border: 1px solid var(--ink); }
.brand-mark i:nth-child(1) { height: 70px; background: #e6bd50; }
.brand-mark i:nth-child(2) { height: 98px; background: var(--sage); }
.brand-mark i:nth-child(3) { height: 84px; }
.eyebrow { margin: 0 0 8px; font: 700 11px/1.4 Arial, sans-serif; letter-spacing: .18em; }
h1 { margin: 0; font-size: clamp(58px, 8vw, 104px); line-height: .82; font-weight: 400; letter-spacing: -.08em; }
.intro { margin: 0 0 4px; max-width: 530px; font: 16px/1.9 "PingFang SC", sans-serif; }

main { width: min(1280px, calc(100% - 48px)); margin: 0 auto; }
section { padding: 42px 0; border-bottom: 1px solid var(--line); }
.section-label { display: flex; gap: 13px; align-items: baseline; margin-bottom: 24px; }
.section-label span { color: var(--red); font: 800 12px Arial, sans-serif; }
.section-label h2 { margin: 0; font-weight: 400; font-size: 24px; }

.patterns { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.pattern-btn {
  min-height: 116px; padding: 12px; cursor: pointer; text-align: left;
  border: 1px solid var(--ink); background: rgba(248,243,231,.6); color: var(--ink);
  display: grid; grid-template-columns: 80px 1fr; align-items: center; gap: 14px;
  transition: transform .15s, box-shadow .15s, background .15s;
}
.pattern-btn:hover { transform: translateY(-2px); box-shadow: 4px 4px 0 var(--ink); }
.pattern-btn.active { background: var(--ink); color: var(--cream); box-shadow: 5px 5px 0 var(--red); }
.pattern-btn canvas { width: 76px; height: 88px; border: 1px solid currentColor; background: var(--cream); }
.pattern-btn b { display: block; font-size: 18px; margin-bottom: 7px; font-weight: 400; }
.pattern-btn small { font: 11px/1.5 Arial, sans-serif; opacity: .7; text-transform: uppercase; letter-spacing: .08em; }

.workbench { display: grid; grid-template-columns: minmax(0, 1fr) 300px; column-gap: 34px; }
.workbench > .section-label { grid-column: 1 / -1; }
.board-wrap { position: relative; background: #4f5b4f; padding: 24px 24px 16px; border: 2px solid var(--ink); box-shadow: 8px 8px 0 rgba(32,35,31,.2); }
.canvas-shell { position: relative; overflow: hidden; background: #eee6d5; border: 1px solid #151714; }
#gameCanvas { width: 100%; height: 500px; display: block; touch-action: none; cursor: grab; }
#gameCanvas.dragging { cursor: grabbing; }
.canvas-hint { position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%); padding: 8px 13px; color: white; background: rgba(20,22,19,.82); font: 12px Arial,sans-serif; pointer-events: none; transition: opacity .25s; white-space: nowrap; }
.canvas-hint.hidden { opacity: 0; }
.seam-key { padding-top: 12px; color: #f6efdf; font: 12px Arial, sans-serif; }
.seam-key i { display: inline-block; width: 24px; border-top: 3px solid #ff5d48; margin-right: 8px; vertical-align: middle; }
.tape { position: absolute; z-index: 3; width: 90px; height: 24px; background: rgba(237,208,133,.76); transform: rotate(-7deg); top: -10px; left: 10%; pointer-events: none; }
.tape-b { left: auto; right: 9%; transform: rotate(5deg); }

.score-card { border: 1px solid var(--ink); background: var(--cream); padding: 25px; display: flex; flex-direction: column; }
.score-kicker { font: 800 11px Arial,sans-serif; letter-spacing: .15em; text-transform: uppercase; margin: 0; }
.score-ring { width: 156px; height: 156px; margin: 20px auto; border: 12px solid var(--red); border-radius: 50%; display: flex; justify-content: center; align-items: baseline; padding-top: 38px; transform: rotate(-2deg); }
.score-ring strong { font: 400 62px/.9 Georgia,serif; }
.score-ring small { margin-left: 4px; font: 12px Arial,sans-serif; }
.metrics { border-top: 1px solid var(--line); }
.metrics div { display: flex; justify-content: space-between; gap: 10px; padding: 13px 0; border-bottom: 1px solid var(--line); font: 13px "PingFang SC", sans-serif; }
.metrics b { font-family: Arial,sans-serif; }
.verdict { min-height: 48px; margin: 18px 0; line-height: 1.6; font-size: 14px; }
.actions { margin-top: auto; display: grid; gap: 9px; }
.actions button { min-height: 45px; cursor: pointer; border: 1px solid var(--ink); }
.primary { color: white; background: var(--red); }
.secondary { color: var(--ink); background: transparent; }
.actions button:hover { filter: brightness(.94); }

.record-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.record { padding: 18px; min-height: 110px; border-top: 4px solid var(--sage); background: rgba(255,255,255,.32); }
.record h3 { font-weight: 400; font-size: 17px; margin: 0 0 18px; }
.record p { margin: 0; font: 12px Arial,sans-serif; display: flex; justify-content: space-between; }
.record strong { font-size: 25px; }
.record.empty strong { color: #8d887e; }
.storage-note { margin: 18px 0 0; color: #777267; font: 11px Arial,sans-serif; }
footer { width: min(1280px, calc(100% - 48px)); margin: 0 auto; padding: 28px 0 45px; display: flex; justify-content: space-between; font: 10px Arial,sans-serif; letter-spacing: .12em; }

@media (max-width: 860px) {
  .masthead { grid-template-columns: 52px 1fr; padding-top: 30px; }
  .brand-mark { height: 75px; }
  .brand-mark i:nth-child(1) { height: 54px; } .brand-mark i:nth-child(2) { height: 74px; } .brand-mark i:nth-child(3) { height: 63px; }
  .intro { grid-column: 1 / -1; }
  .patterns { grid-template-columns: repeat(2, 1fr); }
  .workbench { grid-template-columns: 1fr; }
  .score-card { margin-top: 22px; }
  .record-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  main, footer { width: min(100% - 28px, 1280px); }
  .masthead { padding: 25px 14px; gap: 17px; }
  h1 { font-size: 64px; }
  .patterns { grid-template-columns: 1fr; }
  .pattern-btn { min-height: 96px; }
  .board-wrap { padding: 12px 12px 10px; }
  #gameCanvas { height: 420px; }
  .record-grid { grid-template-columns: 1fr 1fr; }
  footer { display: grid; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }