/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --red:        #bf0000;
  --red-dark:   #8c0000;
  --red-pale:   #fff0f0;
  --gold:       #d4a000;
  --gold-pale:  #fff8e0;
  --green:      #1e7e34;
  --green-pale: #edf7ee;
  --text:       #1a1a1a;
  --text-2:     #444;
  --text-3:     #777;
  --bg:         #ffffff;
  --bg-alt:     #f6f6f6;
  --bg-red:     #fff5f5;
  --border:     #e4e4e4;
  --radius-sm:  6px;
  --radius:     12px;
  --radius-lg:  20px;
  --shadow-sm:  0 2px 8px rgba(0,0,0,.07);
  --shadow:     0 4px 20px rgba(0,0,0,.10);
  --shadow-lg:  0 8px 40px rgba(0,0,0,.14);
  --max:        820px;
  --font-en: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-ja: 'Hiragino Kaku Gothic ProN','Hiragino Sans','Meiryo',sans-serif;
}

html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-en); color: var(--text); background: var(--bg); line-height: 1.7; -webkit-text-size-adjust: 100%; }
body[lang="ja"] { font-family: var(--font-ja); }
a { color: var(--red); }
a:hover { color: var(--red-dark); }
img { display: block; max-width: 100%; height: auto; }
strong { font-weight: 700; }

/* ===== Header ===== */
.site-header {
  background: var(--red);
  padding: .75rem 1.25rem;
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,.3);
}
.site-header__inner {
  max-width: var(--max); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.site-header__brand { font-weight: 700; font-size: .9375rem; color: #fff; text-decoration: none; }
.lang-switch { display: flex; gap: .4rem; }
.lang-switch a {
  color: rgba(255,255,255,.75); text-decoration: none;
  padding: .2rem .7rem; border-radius: 20px;
  border: 1px solid rgba(255,255,255,.35); font-size: .8125rem;
  transition: background .15s, color .15s;
}
.lang-switch a:hover, .lang-switch a[aria-current="true"] {
  background: rgba(255,255,255,.22); color: #fff;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(145deg, #cc0000 0%, #6e0000 100%);
  color: #fff; padding: 3.5rem 1.25rem 4.5rem;
  text-align: center; position: relative; overflow: hidden;
}
/* diagonal stripe texture */
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(255,255,255,.03) 0px,
    rgba(255,255,255,.03) 1px,
    transparent 1px,
    transparent 12px
  );
  pointer-events: none;
}
/* bottom wave divider */
.hero::after {
  content: '';
  position: absolute; bottom: -1px; left: 0; right: 0;
  height: 48px;
  background: var(--bg);
  clip-path: ellipse(56% 100% at 50% 100%);
}
.hero__inner { max-width: var(--max); margin: 0 auto; position: relative; }
.hero__eyebrow {
  display: inline-block;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 20px;
  padding: .3rem 1rem;
  font-size: .8rem; letter-spacing: .07em; text-transform: uppercase;
  margin-bottom: 1.25rem;
}
.hero__title {
  font-size: clamp(2rem, 6vw, 3.1rem);
  font-weight: 900; line-height: 1.15;
  margin-bottom: 1rem;
  text-shadow: 0 2px 12px rgba(0,0,0,.25);
}
.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  opacity: .9; margin-bottom: 2.75rem;
  max-width: 520px; margin-left: auto; margin-right: auto;
}
.hero__actions {
  display: flex; flex-direction: column;
  align-items: center; gap: 2rem;
}
@media (min-width: 520px) {
  .hero__actions { flex-direction: row; justify-content: center; align-items: flex-start; }
}
.hero__qr-wrap { display: flex; flex-direction: column; align-items: center; gap: .5rem; }
.hero__qr-wrap a {
  display: block; background: #fff;
  border-radius: var(--radius); padding: .5rem;
  box-shadow: 0 6px 24px rgba(0,0,0,.35);
  transition: transform .2s;
}
.hero__qr-wrap a:hover { transform: scale(1.04); }
.hero__qr-wrap img { width: 136px; height: 136px; border-radius: var(--radius-sm); }
.hero__qr-label { font-size: .75rem; opacity: .7; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 54px; padding: .9rem 2.25rem;
  font-size: 1.0625rem; font-weight: 800;
  border-radius: var(--radius); text-decoration: none;
  transition: transform .15s, box-shadow .15s; white-space: nowrap; cursor: pointer;
}
.btn--hero { background: #fff; color: var(--red); box-shadow: 0 4px 20px rgba(0,0,0,.25); }
.btn--hero:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,.3); color: var(--red-dark); }
.btn--cta { background: var(--red); color: #fff; box-shadow: 0 4px 20px rgba(191,0,0,.4); }
.btn--cta:hover { background: var(--red-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(191,0,0,.45); }

/* ===== Page layout ===== */
main { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

/* alternating section backgrounds */
.page-section { padding: 3rem 0; }
.page-section--alt {
  margin: 0 -1.25rem;
  padding: 3rem 1.25rem;
  background: var(--bg-alt);
}
.page-section--red {
  margin: 0 -1.25rem;
  padding: 3rem 1.25rem;
  background: var(--bg-red);
}

/* ===== Section title — JP-style with accent bar ===== */
.section-title {
  font-size: clamp(1.2rem, 3.5vw, 1.55rem);
  font-weight: 900; color: var(--text);
  margin-bottom: 1.75rem;
  text-align: center;
  position: relative;
  padding-bottom: .9rem;
}
.section-title::after {
  content: '';
  position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 48px; height: 4px;
  background: var(--red);
  border-radius: 2px;
}
.section-title .s-label {
  display: block;
  font-size: .75rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--red);
  margin-bottom: .35rem;
}

/* ===== Banner ===== */
.banner-wrap { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); margin-bottom: 2rem; }
.banner-wrap img { width: 100%; }

/* ===== Reward cards ===== */
.reward-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem; margin-bottom: 1.25rem;
}
.reward-card {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
  transition: box-shadow .2s, transform .2s;
}
.reward-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }

/* ribbon label */
.reward-card__ribbon {
  position: absolute; top: 20px; right: -26px;
  width: 110px; text-align: center;
  background: var(--red); color: #fff;
  font-size: .7rem; font-weight: 800; letter-spacing: .05em;
  padding: .25rem 0;
  transform: rotate(45deg);
  box-shadow: 0 2px 6px rgba(0,0,0,.2);
}
.reward-card--alt .reward-card__ribbon { background: var(--green); }

.reward-card__type {
  font-size: .8rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .07em; color: var(--text-3); margin-bottom: .5rem;
}
.reward-card__amount {
  font-size: 1.4rem; font-weight: 900; color: var(--red);
  margin-bottom: .75rem;
}
.reward-card--alt .reward-card__amount { color: var(--green); }
.verify-badge {
  display: inline-block;
  font-size: .7rem; font-weight: 700;
  background: var(--gold-pale); color: #7a5800;
  border: 1px solid var(--gold);
  border-radius: 20px; padding: .2rem .65rem;
  text-transform: uppercase; letter-spacing: .05em;
  text-decoration: none; white-space: nowrap;
  transition: background .15s;
}
.verify-badge:hover { background: #fff0c0; color: #5a4000; }
.reward-card__cond {
  font-size: .8125rem; color: var(--text-2);
  border-top: 1px solid var(--border); padding-top: .625rem;
}

/* ===== Tag pills ===== */
.tag-list { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .875rem; }
.tag {
  display: inline-flex; align-items: center; gap: .3rem;
  background: #fff; border: 1.5px solid var(--border);
  border-radius: 20px; padding: .28rem .8rem;
  font-size: .8125rem; color: var(--text-2);
  box-shadow: var(--shadow-sm);
}
.tag::before { content: '✓'; color: var(--red); font-weight: 800; font-size: .75rem; }

/* ===== Checklist ===== */
.checklist { list-style: none; display: flex; flex-direction: column; gap: 1rem; }
.checklist li { display: grid; grid-template-columns: 2.25rem 1fr; gap: .875rem; align-items: start; }
.check-icon {
  width: 2.25rem; height: 2.25rem;
  background: var(--red); color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: .9rem; font-weight: 800; flex-shrink: 0; margin-top: .1rem;
  box-shadow: 0 3px 8px rgba(191,0,0,.3);
}
.check-content { font-size: .9375rem; }
.check-content strong { display: block; margin-bottom: .2rem; font-size: 1rem; }
.check-content .note-text { font-size: .8375rem; color: var(--text-3); line-height: 1.55; }
.check-content .note-text a { font-size: inherit; }

/* ===== Steps ===== */
.steps { display: flex; flex-direction: column; gap: 0; counter-reset: step; }
.step { display: grid; grid-template-columns: 4rem 1fr; gap: .875rem; position: relative; }
.step:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 1.875rem; top: 4rem;
  width: 2px; height: calc(100% - 1.5rem);
  background: linear-gradient(to bottom, var(--red) 0%, rgba(191,0,0,.15) 100%);
}
.step__num-wrap {
  display: flex; flex-direction: column; align-items: center; gap: .15rem;
  flex-shrink: 0;
}
.step__label {
  font-size: .6rem; font-weight: 800; letter-spacing: .1em;
  color: var(--red); text-transform: uppercase;
}
.step__num {
  width: 3.75rem; height: 3.75rem;
  background: var(--red); color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; font-weight: 900;
  box-shadow: 0 4px 16px rgba(191,0,0,.4);
}
.step__body { padding: .75rem 0 2.5rem; }
.step__title { font-weight: 800; font-size: 1.0625rem; margin-bottom: .35rem; color: var(--text); }
.step__desc { font-size: .9rem; color: var(--text-2); line-height: 1.65; }

/* ===== Alert box ===== */
.alert {
  background: var(--gold-pale);
  border-left: 4px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.1rem 1.25rem;
  margin-top: 1.5rem;
  font-size: .9rem; color: #5a3a00; line-height: 1.65;
}
.alert strong { color: #3a2500; }

/* ===== FAQ cards ===== */
.faq-grid { display: flex; flex-direction: column; gap: .875rem; }
.faq-card {
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.375rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, border-color .2s, transform .2s;
}
.faq-card:hover { box-shadow: var(--shadow); border-color: #ccc; transform: translateY(-1px); }
.faq-card__q {
  font-weight: 800; font-size: .9375rem; margin-bottom: .55rem;
  display: flex; gap: .65rem; align-items: flex-start; color: var(--text);
}
.faq-card__q::before {
  content: 'Q';
  flex-shrink: 0; width: 1.6rem; height: 1.6rem;
  background: var(--red); color: #fff;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: .75rem; font-weight: 900; margin-top: .05rem;
}
.faq-card__a {
  font-size: .9rem; color: var(--text-2); line-height: 1.7;
  padding-left: 2.25rem;
}

/* ===== Bottom CTA band ===== */
.cta-band {
  background: linear-gradient(135deg, #1a1a1a 0%, #3a0000 100%);
  color: #fff; padding: 4rem 1.25rem; text-align: center;
  position: relative; overflow: hidden;
}
.cta-band::before {
  content: '';
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(255,255,255,.02) 0px,
    rgba(255,255,255,.02) 1px,
    transparent 1px,
    transparent 14px
  );
  pointer-events: none;
}
.cta-band__inner { max-width: var(--max); margin: 0 auto; position: relative; }
.cta-band__title { font-size: clamp(1.5rem, 4vw, 2.1rem); font-weight: 900; margin-bottom: .75rem; }
.cta-band__sub { font-size: .9375rem; opacity: .8; max-width: 460px; margin: 0 auto 2.25rem; }
.cta-band__actions {
  display: flex; flex-direction: column; align-items: center; gap: 2rem;
}
@media (min-width: 520px) {
  .cta-band__actions { flex-direction: row; justify-content: center; align-items: flex-start; }
}
.cta-band__qr a {
  display: block; background: #fff;
  border-radius: var(--radius); padding: .5rem;
  box-shadow: 0 6px 24px rgba(0,0,0,.4); transition: transform .2s;
}
.cta-band__qr a:hover { transform: scale(1.04); }
.cta-band__qr img { width: 136px; height: 136px; border-radius: var(--radius-sm); }
.cta-band__qr-label { font-size: .75rem; opacity: .55; margin-top: .5rem; }

/* ===== Footer ===== */
.site-footer {
  background: #111; color: rgba(255,255,255,.4);
  text-align: center; padding: 1.5rem 1.25rem;
  font-size: .8rem; line-height: 1.8;
}
.site-footer a { color: rgba(255,255,255,.5); }

/* ===== Utility ===== */
.note { font-size: .8125rem; color: var(--text-3); margin-top: .75rem; line-height: 1.6; }
.note a { font-size: inherit; }
.mt-sm { margin-top: .75rem; }
.mt-md { margin-top: 1.25rem; }
.label-small {
  font-size: .75rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--text-3);
}