:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --raised: #fefce8;
  --line: #000000;
  --text: #000000;
  --muted: #4b5563;
  --green: #15c671;
  --yellow: #facc15;
  --shadow: 4px 4px 0 0 var(--line);
  --shadow-hover: 2px 2px 0 0 var(--line);
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 400 1.0625rem/1.55 "Be Vietnam Pro", system-ui, sans-serif;
}
::selection { background: var(--yellow); color: #000; }
img, svg { display: block; max-width: 100%; }
h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: -0.03em; line-height: 1.1; text-wrap: balance; }
p { margin: 0; }
a { color: inherit; }
code { font: inherit; font-weight: 500; background: #fef08a; padding: .05em .4em; border-radius: .4em; word-break: break-word; }
:focus-visible { outline: 3px solid var(--yellow); outline-offset: 3px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip { position: absolute; left: 16px; top: -80px; background: var(--yellow); color: #000; padding: 10px 18px; border-radius: 12px; z-index: 20; font-weight: 600; }
.skip:focus { top: 12px; }

.wrap { width: min(1160px, 100% - 32px); margin: 32px auto; display: grid; gap: 32px; }
main { display: grid; gap: 32px; }

.box {
  background: var(--surface); border: 4px solid var(--line); border-radius: 20px;
  box-shadow: var(--shadow); padding: clamp(20px, 3.4vw, 36px);
}

.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px 24px; flex-wrap: wrap; padding: 20px 24px; }
.brand { display: flex; align-items: center; gap: 16px; text-decoration: none; }
.logo { width: 64px; height: 64px; border-radius: 14px; border: 3px solid var(--yellow); }
.brand span { display: grid; line-height: 1.2; }
.brand strong { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.02em; }
.brand small { color: var(--muted); font-size: .9375rem; }
.bar-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.chip, .btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  min-height: 44px; padding: 8px 18px; border: 3px solid var(--line); border-radius: 12px;
  background: #2563eb; color: #fff; font: 600 .9375rem/1 "Be Vietnam Pro", system-ui, sans-serif; text-decoration: none;
  box-shadow: var(--shadow-hover); cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
}
.chip-green { background: var(--green); color: #000; }
.chip:hover, .btn:hover { transform: translate(2px, 2px); box-shadow: 0 0 0 0 var(--line); }
.btn { min-height: 56px; padding: 12px 28px; font-size: 1.0625rem; background: var(--green); color: #000; box-shadow: var(--shadow); }
.btn:hover { box-shadow: 2px 2px 0 0 var(--line); }
.btn-ghost { background: var(--surface); color: var(--text); }
.btn span:not(:empty)::before { content: "·"; margin-right: .5em; }

.title { font-size: clamp(1.875rem, 1.2rem + 3vw, 3rem); text-align: center; margin-bottom: 12px; }
.sub { text-align: center; color: var(--muted); max-width: 52ch; margin: 0 auto; font-size: 1.125rem; }
.left { text-align: left; margin-left: 0; }
.note { color: var(--muted); max-width: 64ch; margin: 24px auto 0; text-align: center; }
.note a { color: var(--text); }

.hero { text-align: center; }
.hero h1 { font-size: clamp(2rem, 1.2rem + 3.4vw, 3.5rem); max-width: 18ch; margin: 8px auto 16px; }
.bolt { display: inline-block; width: .85em; height: .85em; margin-right: .25em; vertical-align: -.08em; fill: #f97316; }
.actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin: 28px 0 36px; }
.actions.left { justify-content: flex-start; margin: 24px 0 0; }

.grid2, .grid3 { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; text-align: left; }
.grid2 { grid-template-columns: repeat(2, 1fr); }
.grid3 { grid-template-columns: repeat(3, 1fr); margin-top: 32px; }
.card {
  background: var(--raised); border: 4px solid var(--line); border-radius: 14px; box-shadow: var(--shadow);
  padding: 20px; display: flex; gap: 16px; align-items: flex-start;
  transition: transform .15s ease, box-shadow .15s ease;
}
li.card:hover { transform: translate(2px, 2px); box-shadow: var(--shadow-hover); }
.card h2, .card h3 { font-size: 1.1875rem; margin-bottom: 6px; letter-spacing: -0.01em; }
.card p { color: var(--muted); font-size: 1rem; }
.card-col { flex-direction: column; gap: 4px; }
.icon { flex: none; width: 52px; height: 52px; display: grid; place-items: center; background: var(--yellow); border: 3px solid var(--line); border-radius: 12px; }
.icon svg { width: 26px; height: 26px; fill: none; stroke: #000; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.num { width: 44px; height: 44px; display: grid; place-items: center; margin-bottom: 8px; background: var(--yellow); color: #000; border: 3px solid var(--line); border-radius: 12px; font-weight: 800; font-size: 1.25rem; }

.stage { margin: 32px 0 0; }
.window { border: 4px solid var(--line); border-radius: 14px; overflow: hidden; background: #fff; box-shadow: var(--shadow); }
.window-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; background: #f5f5f4; border-bottom: 3px solid var(--line); color: var(--muted); font-size: .9375rem; text-align: left; }
.window-bar i { width: 12px; height: 12px; border-radius: 50%; background: #ef4444; }
.window-bar i:nth-child(2) { background: var(--yellow); }
.window-bar i:nth-child(3) { background: var(--green); }
.window-bar span { margin-left: 8px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.window-body {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; align-items: start;
  padding: clamp(20px, 4vw, 48px);
  background: var(--yellow);
}
.window-body img { width: 100%; height: auto; border: 3px solid #000; border-radius: 12px; }
.window-body img:nth-child(2) { margin-top: 28px; }

.faq { display: grid; gap: 16px; margin-top: 32px; text-align: left; }
.faq .card { display: block; padding: 0; }
.faq summary { list-style: none; cursor: pointer; padding: 18px 56px 18px 20px; font-weight: 600; font-size: 1.125rem; line-height: 1.35; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 16px; top: 50%; translate: 0 -50%;
  width: 28px; height: 28px; display: grid; place-items: center; line-height: 1;
  background: var(--yellow); color: #000; border-radius: 8px; font-weight: 800; font-size: 1.25rem;
}
.faq details[open] summary::after { content: "–"; }
.faq .card p { padding: 0 20px 20px; max-width: 60ch; }

.cta { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center; }
.cta .sub { margin: 0; }
.qrs { display: flex; gap: 20px; }
.qr-card { margin: 0; padding: 12px 12px 14px; width: 208px; background: var(--raised); border: 4px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); text-align: center; }
.qr { width: 100%; height: auto; background: #fff; border: 3px solid var(--line); border-radius: 10px; padding: 6px; }
.qr-card figcaption { display: grid; gap: 2px; margin-top: 10px; font-size: .875rem; line-height: 1.3; color: var(--muted); }
.qr-card strong { color: #000; font-size: 1.0625rem; }
.qr-card .acc { color: #000; font-weight: 700; letter-spacing: .02em; user-select: all; }
.supporters { list-style: none; display: flex; flex-wrap: wrap; justify-content: center; gap: 20px; margin: 24px 0 0; padding: 0; }
.supporter { display: grid; justify-items: center; gap: 10px; width: 200px; padding: 14px 12px; background: var(--raised); border: 4px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); color: #000; font-weight: 700; text-align: center; text-decoration: none; transition: transform .15s, box-shadow .15s; }
.supporter:hover { transform: translate(2px, 2px); box-shadow: var(--shadow-hover); }
.supporter img { width: 72px; height: 72px; object-fit: cover; border: 3px solid var(--line); border-radius: 50%; background: #fff; }

.foot { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px 24px; padding: 20px 24px; color: var(--muted); }
.foot ul { display: flex; gap: 8px 24px; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; }
.foot a { display: inline-block; padding: 6px 0; text-underline-offset: 4px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}
@media (max-width: 800px) {
  .wrap { margin: 16px auto; gap: 20px; }
  main { gap: 20px; }
  .grid2, .grid3 { grid-template-columns: 1fr; }
  .window-body { grid-template-columns: 1fr 1fr; }
  .window-body img:nth-child(3) { grid-column: 1 / -1; }
  .window-body img:nth-child(2) { margin-top: 0; }
  .cta { grid-template-columns: minmax(0, 1fr); }
  .qrs { flex-wrap: wrap; justify-content: center; }
  .qr-card { width: min(208px, 100%); }
  .bar { padding: 16px; }
  .brand strong { font-size: 1.25rem; }
  .logo { width: 52px; height: 52px; }
}
@media (max-width: 520px) {
  .window-body { grid-template-columns: 1fr; }
  .window-bar span { display: none; }
}