/* ---------- BASE ---------- */
* { box-sizing: border-box; margin: 0; }

:root {
  --ink: #1e2430;
  --muted: #667085;
  --line: #e4e7ec;
  --accent: #4f46e5;
  --ok: #067647;
  --ok-bg: #dcfae6;
  --no: #b42318;
  --no-bg: #fee4e2;
}

body {
  min-height: 100vh;
  background: #f6f7fb;
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.top { max-width: 1100px; margin: 0 auto; padding: 28px 16px 8px; }
.top h1 { font-size: clamp(24px, 4vw, 34px); letter-spacing: -.5px; }
.top p { color: var(--muted); margin-top: 6px; }

.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 16px;
}
.panel { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
/* ---------- END BASE ---------- */

/* ---------- METHOD PICKER ---------- */
.methods { grid-row: span 2; align-self: start; display: flex; flex-direction: column; gap: 8px; }
.method {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: inherit;
  font: 600 14px system-ui, sans-serif;
  text-align: left;
  cursor: pointer;
  transition: border-color .2s, box-shadow .2s, transform .15s;
}
.method:hover { transform: translateX(3px); }
.method .num {
  flex: none;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: #eef2ff;
  color: var(--accent);
  font-size: 13px;
}
.method small { display: block; margin-top: 2px; font-weight: 500; color: var(--muted); font-size: 12px; }
.method[aria-pressed="true"] { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79, 70, 229, .15); }
.method[aria-pressed="true"] .num { background: var(--accent); color: #fff; }
.method:focus-visible, .copy:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
/* ---------- END METHOD PICKER ---------- */

/* ---------- PREVIEW ---------- */
.checks { display: flex; gap: 8px; margin-bottom: 14px; }
.check {
  padding: 5px 12px;
  border-radius: 999px;
  font: 600 13px system-ui, sans-serif;
  background: var(--no-bg);
  color: var(--no);
  transition: background .3s, color .3s;
}
.check::before { content: "✗ "; }
.check.yes { background: var(--ok-bg); color: var(--ok); }
.check.yes::before { content: "✓ "; }

/* The parent box. The crosshair lines mark its exact middle. */
.parent {
  height: var(--ph, 300px);
  border: 2px dashed #c9ced8;
  border-radius: 12px;
  background:
    linear-gradient(#ef4444, #ef4444) 50% 0 / 1px 100% no-repeat,
    linear-gradient(90deg, #ef4444, #ef4444) 0 50% / 100% 1px no-repeat,
    repeating-linear-gradient(45deg, #fafbfc 0 10px, #f3f4f8 10px 20px);
  transition: height .3s ease;
}
.child {
  width: var(--cw, 160px);
  height: var(--ch, 90px);
  display: grid;
  place-content: center;
  border-radius: 10px;
  background: linear-gradient(135deg, #6d5dfc, #22d3ee);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  text-align: center;
  box-shadow: 0 10px 24px rgba(79, 70, 229, .3);
  opacity: .92;
}

.sizes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 16px; font-size: 13px; }
.sizes label { display: block; }
.sizes output { float: right; font-weight: 700; color: var(--accent); font-family: ui-monospace, Consolas, monospace; }
.sizes input { width: 100%; margin-top: 6px; accent-color: var(--accent); }
/* ---------- END PREVIEW ---------- */

/* ---------- CODE ---------- */
.code-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 12px; }
.code-head h2 { font-size: 18px; }
.copy {
  flex: none;
  padding: 7px 12px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font: 600 13px system-ui, sans-serif;
  cursor: pointer;
}
.code pre {
  padding: 14px 16px;
  border-radius: 10px;
  background: #111827;
  color: #e5e7eb;
  font: 14px/1.6 ui-monospace, Consolas, monospace;
  overflow-x: auto;
}
.css .sel { color: #f9a8d4; }
.css .k { color: #93c5fd; }
.css .v { color: #fcd34d; }
.css .c { color: #6b7280; }
.note { margin-top: 12px; font-size: 14px; line-height: 1.55; color: #3b3f4a; }
/* ---------- END CODE ---------- */

/* ---------- SMALL SCREENS ---------- */
@media (max-width: 800px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .methods { grid-row: auto; display: grid; grid-template-columns: 1fr 1fr; }
  .method small { display: none; }
  .sizes { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  .parent, .method, .check { transition: none; }
}
/* ---------- END SMALL SCREENS ---------- */