/* Eraser Fight tokens match the iOS app (Theme.paper / ink / deskBackdrop / p1). */

:root {
  --desk: #1c1f26;
  --desk-lift: #262a33;
  --desk-deep: #14161b;
  --paper: #f7f2e6;
  --ink: #242630;
  --chalk: #f4f1e8;
  --chalk-dim: rgba(244, 241, 232, 0.62);
  --p1: #e8593d;
  --p1-press: #a83422;
  --p1-btn: #c43d28;
  --p2: #3387d1;
  --wood: #8b5e3c;
  --stroke: rgba(244, 241, 232, 0.12);
  --radius: 14px;
  --maxw: 1120px;
  --font: ui-rounded, "SF Pro Rounded", "Hiragino Maru Gothic ProN", "Hiragino Sans",
    "Yu Gothic UI", system-ui, sans-serif;
  --focus: #f0c14a;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--desk);
  color: var(--chalk);
  line-height: 1.6;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(circle at 18% -10%, rgba(232, 89, 61, 0.16), transparent 42%),
    radial-gradient(circle at 88% 8%, rgba(51, 135, 209, 0.1), transparent 36%);
}

img { max-width: 100%; height: auto; display: block; }

a { color: #7eb7ea; }
a:hover { color: #b7d7f4; }
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 22px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
}
.skip:focus {
  left: 16px;
  top: 16px;
  z-index: 30;
  background: var(--p1);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
}

/* ---------- header ---------- */
header.site {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 64px;
  background: color-mix(in srgb, var(--desk) 88%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--stroke);
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--chalk);
  text-decoration: none;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.35);
}
.brand span { color: var(--p1); }
nav.site {
  display: flex;
  align-items: center;
  gap: 22px;
}
nav.site a {
  color: var(--chalk-dim);
  text-decoration: none;
  font-weight: 650;
  font-size: 0.92rem;
  white-space: nowrap;
}
nav.site a:hover { color: var(--chalk); }

/* ---------- hero ---------- */
.hero {
  min-height: calc(100dvh - 64px);
  display: flex;
  align-items: center;
  padding: 28px 0 48px;
  position: relative;
  z-index: 1;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 40px;
  align-items: center;
}
.kicker {
  margin: 0 0 12px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--p1);
}
.hero h1 {
  font-size: clamp(2.15rem, 5vw, 3.5rem);
  margin: 0 0 12px;
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.05;
  text-transform: uppercase;
}
.hero h1 em {
  display: block;
  font-style: italic;
  color: var(--p1);
  letter-spacing: 0.06em;
  line-height: 1.12;
  padding-bottom: 6px;
}
.hero .tagline {
  font-size: 1.15rem;
  color: var(--chalk-dim);
  max-width: 34ch;
  margin: 0 0 26px;
  line-height: 1.45;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: var(--radius);
  font-weight: 800;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  transition: transform 0.15s ease, background 0.15s ease;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--p1-btn);
  color: #fff;
}
.btn-primary:hover { background: var(--p1-press); color: #fff; }
.btn-ghost {
  background: transparent;
  color: var(--chalk);
  border: 1px solid var(--stroke);
}
.btn-ghost:hover { color: #fff; border-color: rgba(244, 241, 232, 0.35); }

.hero-shot {
  margin: 0;
  position: relative;
}
.hero-shot img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 18px;
  box-shadow:
    0 28px 60px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
  animation: settle 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}
.hero-shot figcaption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  color: #fff;
  background: rgba(20, 16, 14, 0.55);
  padding: 6px 10px;
  border-radius: 8px;
}

@keyframes settle {
  from { opacity: 0; transform: translateY(16px) rotate(-1.6deg); }
  to { opacity: 1; transform: none; }
}

/* ---------- sections ---------- */
section.block {
  padding: 72px 0;
  position: relative;
  z-index: 1;
}
section.block h2 {
  font-size: clamp(1.55rem, 3vw, 2.05rem);
  margin: 0 0 12px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.lede {
  font-size: 1.05rem;
  color: var(--chalk-dim);
  max-width: 62ch;
  margin: 0 0 28px;
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}
.facts > div {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.facts dt {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(36, 38, 48, 0.55);
}
.facts dd {
  margin: 4px 0 0;
  font-weight: 800;
  font-size: 1.05rem;
}

.modes {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 14px;
}
.mode {
  border-radius: var(--radius);
  padding: 24px 24px 22px;
  min-height: 180px;
}
.mode h3 {
  margin: 0 0 8px;
  font-size: 1.35rem;
  font-weight: 800;
}
.mode p { margin: 0; line-height: 1.45; }
.mode-pin {
  background: var(--paper);
  color: var(--ink);
}
.mode-pin p { color: rgba(36, 38, 48, 0.72); }
.mode-drop {
  background: var(--desk-lift);
  color: var(--chalk);
  border: 1px solid var(--stroke);
}
.mode-drop p { color: var(--chalk-dim); }
.mode-drop h3 { color: #7eb7ea; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 36px;
  align-items: center;
}
.split .copy p { color: var(--chalk-dim); margin: 0 0 14px; }
.photo {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 22px 50px rgba(0, 0, 0, 0.38);
}
.photo img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.photo figcaption {
  padding: 10px 12px 12px;
  font-size: 0.82rem;
  color: var(--chalk-dim);
  background: var(--desk-deep);
}

.steps {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  margin: 0;
}
.steps > div {
  background: var(--desk-lift);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 20px;
}
.steps dt {
  font-size: 1.15rem;
  font-weight: 800;
  margin: 0 0 6px;
  color: var(--chalk);
}
.steps dd {
  margin: 0;
  color: var(--chalk-dim);
}

.flags {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}
.eraser {
  margin: 0;
  background: var(--desk-lift);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 10px 10px 12px;
  text-align: center;
}
.eraser .rubber {
  background: #efe6d8;
  border-radius: 10px;
  padding: 7px;
  box-shadow: 0 6px 0 #d8cbb8, 0 10px 16px rgba(0, 0, 0, 0.28);
}
.eraser svg,
.eraser .flagface {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}
.eraser figcaption {
  margin-top: 10px;
  font-size: 0.8rem;
  font-weight: 700;
}
.eraser .tag {
  display: block;
  font-size: 0.68rem;
  font-weight: 650;
  color: var(--chalk-dim);
}

.cta {
  text-align: center;
  border-top: 1px solid var(--stroke);
}
.cta p { color: var(--chalk-dim); margin: 0 auto 18px; max-width: 52ch; }
.cta .hero-actions { justify-content: center; }

.lang-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}
.lang-row a {
  color: var(--chalk);
  text-decoration: none;
  background: var(--desk-lift);
  border: 1px solid var(--stroke);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
  font-size: 0.88rem;
}
.lang-row a:hover { border-color: var(--p1); color: #fff; }

footer.site {
  background: var(--desk-deep);
  color: var(--chalk-dim);
  padding: 28px 0;
  font-size: 0.9rem;
  border-top: 1px solid var(--stroke);
  position: relative;
  z-index: 1;
}
footer.site .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}
footer.site nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}
footer.site a {
  color: var(--chalk);
  text-decoration: none;
}
footer.site a:hover { color: #fff; }

.page {
  background: var(--desk-lift);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 44px 48px;
  margin: 48px auto;
  position: relative;
  z-index: 1;
}
.page h1 {
  margin-top: 0;
  font-size: 2rem;
  letter-spacing: -0.03em;
}
.page h2 {
  font-size: 1.2rem;
  margin: 32px 0 8px;
}
.page p, .page li { color: var(--chalk-dim); }
.page ul, .page ol { padding-left: 22px; }
.updated {
  color: rgba(244, 241, 232, 0.45);
  font-size: 0.85rem;
  margin-top: -8px;
}

details.faq {
  border-bottom: 1px solid var(--stroke);
  padding: 14px 0;
}
details.faq summary {
  font-weight: 700;
  cursor: pointer;
  color: var(--chalk);
}
details.faq p { margin: 10px 0 4px; color: var(--chalk-dim); }
.faq-block .faq { max-width: 720px; }

.flag-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.flag-card {
  background: var(--desk);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 14px;
}
.flag-card .rubber {
  background: #efe6d8;
  border-radius: 10px;
  padding: 7px;
  box-shadow: 0 6px 0 #d8cbb8, 0 10px 16px rgba(0, 0, 0, 0.28);
}
.flag-card svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}
.flag-card h3 {
  margin: 12px 0 4px;
  font-size: 1.05rem;
}
.flag-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--chalk-dim);
}

@media (prefers-reduced-transparency: reduce) {
  header.site {
    background: var(--desk);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-shot img { animation: none; }
  .btn:active { transform: none; }
}

@media (max-width: 900px) {
  .hero { min-height: 0; padding: 20px 0 36px; }
  .hero-grid,
  .split {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .modes,
  .steps { grid-template-columns: 1fr; }
  .facts { grid-template-columns: 1fr 1fr; }
  .flags { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .flag-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .hero h1 { font-size: 2.05rem; }
  .page { padding: 28px 22px; margin: 28px auto; }
  nav.site { gap: 12px; }
  nav.site a { font-size: 0.84rem; }
  .nav-wide { display: none; }
  header.site .wrap { padding-left: 16px; padding-right: 16px; }
  .facts, .flag-grid { grid-template-columns: 1fr; }
  .flags { grid-template-columns: 1fr 1fr; }
}