/* Shell: cover, top bar, scene layout, explainer */

/* ---------- cover ---------- */
.cover {
  min-height: 100vh; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); align-items: center;
  gap: 2rem; padding: 3rem clamp(1rem, 5vw, 5rem); background: var(--paper); overflow: hidden;
}
.cover-text { max-width: 34rem; display: grid; gap: 1.25rem; }
.cover-kicker { font-weight: 600; color: var(--magenta); margin: 0; }
.cover h1 { font-size: clamp(2.2rem, 4.6vw, var(--t-4xl)); font-weight: 800; letter-spacing: -.025em; }
.cover-lead { font-size: var(--t-l); color: var(--ink-2); max-width: 30rem; margin: 0; }

.cover-stage { position: relative; height: min(560px, 80vw); display: grid; place-items: center; --R: min(215px, 34vw); }
.parcel { position: relative; width: 220px; height: 220px; display: grid; place-items: center; z-index: 2; }
.parcel-box {
  position: absolute; inset: 0; border-radius: 28px; background: var(--magenta);
  box-shadow: inset 0 -14px 0 rgba(0,0,0,.08), 0 30px 50px -25px rgba(194,31,98,.7);
  transition: transform .7s var(--ease-out), opacity .5s .2s;
}
.parcel-tape { position: absolute; left: 50%; top: 0; bottom: 0; width: 34px; transform: translateX(-50%); background: var(--yellow); opacity: .9; }
.parcel-tape::after { content: ""; position: absolute; top: 50%; left: -93px; width: 220px; height: 34px; transform: translateY(-50%); background: var(--yellow); }
.big-sticker { --s: 140px; z-index: 3; border: 0; cursor: pointer; font-size: var(--t-xl); transition: transform .8s var(--ease-spring), opacity .4s .35s; }
.big-sticker:hover { transform: rotate(4deg) scale(1.04); }

.sticker-ring { list-style: none; margin: 0; padding: 0; position: absolute; inset: 0; display: grid; place-items: center; }
.sticker-ring li {
  position: absolute; display: grid; justify-items: center; gap: .4rem; width: 120px;
  transform: translate(0, 0) scale(.2); opacity: 0;
  transition: transform .8s var(--ease-spring) calc(.35s + var(--i) * .07s), opacity .3s calc(.35s + var(--i) * .07s);
}
.sticker-ring .sticker { --s: 92px; font-size: .7rem; border: 0; cursor: pointer; transform: rotate(calc(-12deg + var(--i) * 5deg)); transition: transform .25s var(--ease-spring); }
.sticker-ring .sticker:hover { transform: rotate(0deg) scale(1.08); }
.ring-label { font-size: var(--t-xs); font-weight: 600; color: var(--ink-2); text-align: center; line-height: 1.2; }

.cover.is-open .parcel-box { transform: scale(.5) rotate(-6deg); opacity: 1; }
.sticker-ring .sticker span { hyphens: manual; overflow-wrap: normal; }
.cover.is-open .big-sticker { transform: translateY(-30px) rotate(200deg) scale(.4); opacity: 0; pointer-events: none; }
.cover.is-open .sticker-ring li { opacity: 1; transform: translate(calc(var(--x) * var(--R)), calc(var(--y) * var(--R))) scale(1); }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 1rem;
  padding: .7rem clamp(1rem, 3vw, 2.5rem); background: rgba(255,255,255,.92); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.wordmark { font-family: var(--f-display); font-weight: 800; font-size: var(--t-l); color: var(--ink); text-decoration: none; white-space: nowrap; }
.wordmark span { color: var(--magenta); }
.tabs { display: flex; gap: .25rem; margin: 0 auto; background: var(--paper-2); padding: .25rem; border-radius: var(--r-pill); }
.tabs button { border: 0; background: none; padding: .5rem 1rem; border-radius: var(--r-pill); font-weight: 600; font-size: var(--t-s); cursor: pointer; color: var(--ink-2); white-space: nowrap; }
.tabs button[aria-selected="true"] { background: var(--paper); color: var(--ink); box-shadow: var(--shadow-lift); }
.mode-badge { font-size: var(--t-xs); font-weight: 600; padding: .35rem .7rem; border-radius: var(--r-pill); background: var(--yellow-soft); color: #7a5d00; white-space: nowrap; }
.mode-badge.is-live { background: var(--mint-soft); color: #11776d; }

.lang-switch { display: flex; background: var(--paper-2); border-radius: var(--r-pill); padding: .2rem; }
.lang-switch button { border: 0; background: none; padding: .3rem .6rem; border-radius: var(--r-pill); font-weight: 700; font-size: var(--t-xs); cursor: pointer; color: var(--ink-3); }
.lang-switch button[aria-pressed="true"] { background: var(--paper); color: var(--ink); box-shadow: var(--shadow-lift); }

/* ---------- scene ---------- */
main { padding: 1.25rem clamp(1rem, 3vw, 2.5rem) 4rem; max-width: 1440px; margin: 0 auto; }
body:not(.touring) main { display: none; }
.subnav { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1.25rem; min-height: 2.2rem; }
.scene { display: grid; grid-template-columns: minmax(260px, 340px) minmax(0, 1fr); gap: clamp(1.5rem, 3vw, 3rem); align-items: start; }

.explain { position: sticky; top: 5.5rem; display: grid; gap: 1rem; }
.explain.swap > * { animation: rise .45s var(--ease-out) both; }
.explain.swap > *:nth-child(2) { animation-delay: .04s; } .explain.swap > *:nth-child(3) { animation-delay: .08s; } .explain.swap > *:nth-child(4) { animation-delay: .12s; }
.ex-sticker { --s: 96px; font-size: .72rem; }
.explain h2 { font-size: var(--t-2xl); font-weight: 800; }
.ex-what { font-size: var(--t-m); color: var(--ink); margin: 0; }
.ex-facts { margin: 0; display: grid; gap: .3rem; font-size: var(--t-s); }
.ex-facts dt { font-weight: 700; margin-top: .6rem; }
.ex-facts dd { margin: 0; color: var(--ink-2); }
.ex-nav { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .5rem; }

.stage { min-width: 0; }
.module[hidden] { display: none; }

@media (max-width: 960px) {
  .cover { grid-template-columns: 1fr; padding-top: 2rem; }
  .cover-stage { height: 460px; --R: 150px; }
  .sticker-ring .sticker { --s: 74px; font-size: .56rem; }
  .ring-label { display: none; }
  .scene { grid-template-columns: 1fr; }
  .explain { position: static; }
  .topbar { flex-wrap: wrap; }
  .tabs { order: 3; width: 100%; overflow-x: auto; }
}
@media (max-width: 420px) {
  .phone { width: 100%; height: 680px; border-radius: 36px; padding: 8px; }
}