:root {
  --paper: #f7fafc;
  --paper-2: #e8f3ea;
  --ink: #16324a;
  --muted: #5d6d7e;
  --line: rgba(22, 50, 74, 0.08);
  --accent: #1875f3;
  --price: #2a6fbf;
  --accent-ink: #0f62d6;
  --white: #ffffff;
  --card: #ffffff;
  --frame: 1080px;
  --pad: max(22px, calc((100vw - var(--frame)) / 2));
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --shadow: 0 16px 40px rgba(22, 50, 74, 0.06);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(820px 460px at 0% 0%, rgba(186, 220, 255, 0.55), transparent 68%),
    radial-gradient(720px 420px at 100% 18%, rgba(176, 230, 214, 0.4), transparent 66%),
    radial-gradient(680px 380px at 80% 78%, rgba(255, 226, 186, 0.38), transparent 70%),
    #fbfcfd;
  background-attachment: fixed;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
::selection { background: rgba(24, 117, 243, 0.16); }
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--sans); font-weight: 500; letter-spacing: -0.03em; line-height: 1.12; margin: 0; }
p { margin: 0; }

.mast {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 16px var(--pad);
  background: rgba(244, 249, 253, 0.72);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  color: var(--ink);
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.mast.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, 0.9);
}
.mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 500;
  text-decoration: none;
}
.mark img { width: 28px; height: 28px; display: block; }
.colophon .mark { font-size: 16px; }
.colophon .mark img { width: 22px; height: 22px; }
.mast-nav { display: flex; gap: 22px; margin-left: auto; }
.mast-nav a {
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color 0.25s var(--ease);
}
.mast-nav a:hover { color: var(--ink); }
.mast-nav a[aria-current="page"] {
  color: var(--ink);
  box-shadow: inset 0 -2px 0 var(--accent);
}
.mast-tools { display: flex; align-items: center; gap: 10px; }
.pick { position: relative; }
.pick-btn, .mast-login {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  border-radius: 999px;
  padding: 7px 14px;
  font: inherit;
  font-size: 13px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.pick-btn:hover, .mast-login:hover { border-color: rgba(24, 117, 243, 0.45); }
.pick-list {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 148px;
  margin: 0;
  padding: 6px;
  list-style: none;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
}
.pick-list button {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--ink);
  border-radius: 10px;
  padding: 8px 12px;
  font: inherit;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
}
.pick-list button[aria-current="page"] { background: #eef6fb; }
.pick.is-open .pick-btn { border-color: rgba(24, 117, 243, 0.45); }
.nav-toggle {
  display: none;
  margin-left: auto;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 14px;
  font: inherit;
  cursor: pointer;
}
.hero { padding: 18px var(--pad) 8px; }
.hero-stage {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  gap: 28px;
  align-items: center;
  min-height: min(74vh, 680px);
  padding: 52px 36px 52px 56px;
  border-radius: 36px;
  overflow: hidden;
  background:
    radial-gradient(460px 300px at 94% 6%, rgba(215, 243, 236, 0.95), transparent 68%),
    radial-gradient(320px 220px at 72% 108%, rgba(246, 234, 211, 0.9), transparent 70%),
    linear-gradient(155deg, #d4eaf8 0%, #e8f4fb 46%, #f6fafc 100%);
}
.hero-stage::before,
.hero-stage::after {
  content: "";
  position: absolute;
  width: 140px;
  height: 100px;
  pointer-events: none;
  background-repeat: repeat;
  background-size: 14px 14px;
}
.hero-stage::before {
  top: 18px;
  right: 22px;
  width: 88px;
  height: 28px;
  background-image: radial-gradient(circle, #3cbea8 1.5px, transparent 1.6px);
}
.hero-stage::after { display: none; }
.hero-copy { position: relative; z-index: 1; margin: 0; min-width: 0; }
.hero-copy h1 {
  font-size: clamp(44px, 4.4vw, 68px);
  line-height: 1.08;
  color: var(--ink);
}
.lede {
  margin: 22px auto 0;
  font-size: 18px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 28em;
}
.hero .lede { margin: 18px 0 0; max-width: none; }
.hero-visual { position: relative; z-index: 1; min-width: 0; }
.hero-frame {
  margin: 0;
  padding: 10px;
  border-radius: 28px;
  background: #fff;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.8),
    0 22px 48px rgba(40, 90, 150, 0.14);
}
.hero-photo {
  width: 100%;
  height: min(54vh, 500px);
  object-fit: cover;
  border-radius: 20px;
  transform: scale(1.06);
  animation: drift 22s var(--ease) infinite alternate;
}
.hero-inset {
  position: absolute;
  left: 22px;
  bottom: 22px;
  width: min(228px, 42%);
  margin: 0;
  padding: 8px;
  border-radius: 18px;
  background: linear-gradient(180deg, #fffdf8 0%, #fbf6ea 100%);
  box-shadow: 0 16px 36px rgba(90, 60, 20, 0.16);
}
.hero-inset img {
  width: 100%;
  height: 148px;
  object-fit: cover;
  border-radius: 12px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: transform 0.35s var(--ease), background 0.35s var(--ease), border-color 0.35s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-solid {
  background: linear-gradient(180deg, #4c9af6 0%, #1875f3 55%, #1468dc 100%);
  color: var(--white);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 8px 18px rgba(24, 117, 243, 0.22);
}
.btn-solid:hover { background: linear-gradient(180deg, #5aa3f8 0%, #1875f3 60%, #0f62d6 100%); }
.btn-quiet { background: rgba(255, 255, 255, 0.7); color: var(--accent); border-color: rgba(24, 117, 243, 0.45); }
.btn-quiet:hover { border-color: var(--accent); }

.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  padding: 36px var(--pad) 8px;
}
.facts p {
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-size: 15px;
  letter-spacing: 0.01em;
}

.points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.points li {
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-size: 15px;
}

.block-head { max-width: 40em; }
.block-head p { margin-top: 10px; color: var(--muted); }

.sheet, .periods { padding: 72px var(--pad) 8px; }
.sheet h2, .systems h2, .periods h2 { font-size: clamp(32px, 4vw, 48px); }

.same-board {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
}
.same-board article { padding: 28px 26px 32px; }
.same-board article + article { border-left: 1px solid var(--line); }
.same-board h3 { margin-top: 12px; font-size: 26px; letter-spacing: -0.03em; }
.same-board p:last-child { margin-top: 12px; color: var(--muted); font-size: 14px; line-height: 1.6; }

.versus, .systems, .uses, .sheet {
  display: grid;
  gap: 22px;
  align-items: stretch;
}
.versus, .systems { grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr); padding: 28px var(--pad) 8px; }
.uses { grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr); padding: 28px var(--pad) 8px; }
.sheet { grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr); }
.versus .block-head,
.systems .block-head,
.uses .block-head,
.sheet .block-head {
  position: relative;
  overflow: hidden;
  margin: 0;
  padding: 40px 36px;
  border-radius: 36px;
  max-width: none;
}
.versus .block-head { background: linear-gradient(160deg, #d5eaf8 0%, #eef6fb 100%); }
.systems .block-head { background: linear-gradient(165deg, #d7f3ec 0%, #f3fbf8 100%); }
.uses .block-head,
.sheet .block-head { background: linear-gradient(200deg, #f6ead3 0%, #fbf6ea 100%); }
.uses .block-head { grid-column: 2; grid-row: 1; }
.use-list { grid-column: 1; grid-row: 1; margin-top: 0; }
.versus .block-head::before,
.systems .block-head::before,
.uses .block-head::before,
.sheet .block-head::before,
.split-copy::before {
  content: "";
  position: absolute;
  width: 150px;
  height: 110px;
  pointer-events: none;
  background-repeat: repeat;
  background-size: 14px 14px;
}
.versus .block-head::before,
.split-copy::before {
  right: 22px;
  bottom: 18px;
  background-image: radial-gradient(circle, #6aaee0 1.5px, transparent 1.6px);
}
.systems .block-head::before {
  left: 20px;
  bottom: 16px;
  background-image: radial-gradient(circle, #3cbea8 1.5px, transparent 1.6px);
}
.uses .block-head::before,
.sheet .block-head::before {
  right: 18px;
  top: 18px;
  background-image: radial-gradient(circle, #e0a24a 1.5px, transparent 1.6px);
}
.versus .block-head > *,
.systems .block-head > *,
.uses .block-head > *,
.sheet .block-head > *,
.split-copy > * { position: relative; z-index: 1; }
.versus-grid, .os-board, .same-board { margin-top: 0; }
.versus-grid {
  margin-top: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
}
.versus-grid article { padding: 32px 32px 36px; }
.versus-grid article + article {
  border-left: 1px solid var(--line);
  background: #f7fbfe;
}
.versus-grid h3 { margin-top: 12px; font-size: 28px; letter-spacing: -0.03em; }
.versus-grid ul { list-style: none; margin: 22px 0 0; padding: 0; }
.versus-grid li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
}

.offer {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
}
.band-open {
  background: #f7fbfe;
  border-top: 1px solid var(--line);
}
.band-open .band-label { padding: 18px 28px 0; }
.band-figures { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 8px; }
.band-figures p {
  margin: 0;
  padding: 8px 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-right: 1px solid var(--line);
}
.band-figures p:last-child { border-right: 0; }
.band-figures strong { font-size: 22px; font-weight: 500; letter-spacing: -0.03em; }
.band-figures span { font-size: 20px; letter-spacing: -0.03em; color: var(--price); }
.band-figures p:first-child span { color: var(--ink); }
.band-figures em { font-style: normal; color: var(--muted); font-size: 13px; }
.extra-lines { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.extra-lines li {
  display: grid;
  grid-template-columns: 140px 180px 1fr;
  gap: 16px;
  padding: 16px 28px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.extra-lines li:first-child { border-top: 0; }
.extra-lines li span:nth-child(2) { color: var(--price); }
.extra-lines li span:last-child { color: var(--muted); }

.use-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: use;
}
.use-list li {
  display: grid;
  grid-template-columns: 72px 220px 1fr;
  gap: 24px;
  align-items: baseline;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.use-list li::before {
  counter-increment: use;
  content: counter(use, decimal-leading-zero);
  color: var(--accent);
  font-size: 14px;
}
.use-list h3 { font-size: 22px; }
.use-list p { color: var(--muted); }

.included {
  margin: 96px var(--pad) 0;
  padding: 48px;
  border-radius: 18px;
  background:
    radial-gradient(420px 180px at 12% 0%, rgba(120, 176, 240, 0.35), transparent 70%),
    linear-gradient(165deg, #1a3354 0%, #10233c 55%, #0c1b30 100%);
  color: #f4f7fb;
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 40px;
}
.included p { margin-top: 14px; color: rgba(244, 247, 251, 0.7); }
.included ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 32px;
}
.included li {
  padding: 14px 0;
  border-top: 1px solid rgba(244, 247, 251, 0.16);
}

.option-board {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  background: var(--white);
}
.band-label {
  margin: 0;
  padding: 16px 22px 0;
  font-size: 13px;
  color: var(--muted);
}
.band-cells { display: grid; grid-template-columns: repeat(3, 1fr); }
.band-cells div {
  padding: 18px 22px 22px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.band-cells div:last-child { border-right: 0; }
.band-cells strong { font-size: 22px; font-weight: 500; }
.band-cells span { font-size: 18px; color: var(--ink); }
.band-cells em { font-style: normal; color: var(--muted); font-size: 14px; }
.band-cells div:first-child span { color: var(--accent); }
.addon-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.addon-list li {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 16px 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}
.addon-list li:first-child { border-top: 0; }
.addon-list li span:first-child { color: var(--ink); }

.os-board {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
  min-height: 360px;
}
.os-free { border-right: 1px solid var(--line); }
.os-free ul { list-style: none; margin: 8px 0 0; padding: 0 8px 12px; }
.os-free li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  font-size: 17px;
}
.os-free li span { color: var(--muted); }
.os-win { display: flex; flex-direction: column; background: #f4fbf8; }
.os-win div {
  margin: 0 18px;
  padding: 22px 4px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}
.os-win div:first-of-type { margin-top: auto; }
.os-win strong { font-size: 28px; font-weight: 500; color: var(--price); }
.close h2 .money { color: #d6ebff; }
.os-win strong span { font-size: 14px; color: var(--muted); font-weight: 400; }

.periods > p { margin-top: 16px; color: var(--muted); max-width: 40em; }
.periods ol {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 28px 0 0;
  padding: 0;
  counter-reset: step;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
}
.periods li {
  padding: 28px 24px 32px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: transparent;
}
.periods li:last-child { border-right: 0; }
.periods li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  color: var(--accent);
  font-size: 13px;
}
.periods span { color: var(--muted); }

.split, .access {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 72px;
  align-items: center;
  padding: 120px var(--pad);
}
.access { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); }
.split-photo, .access figure, .disk {
  margin: 0;
  min-width: 0;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.split-photo img, .access img, .disk img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s var(--ease);
}
.split-photo:hover img, .access figure:hover img, .disk:hover img { transform: scale(1.04); }
.split-photo img { height: 640px; }
.split-copy {
  position: relative;
  overflow: hidden;
  padding: 44px 40px;
  border-radius: 36px;
  background: linear-gradient(165deg, #d7f3ec 0%, #f4fbf8 100%);
}
.split-copy h2, .tiers-head h2, .access h2, .faq > h2, .close h2, .disk figcaption h2 {
  font-size: clamp(32px, 4vw, 56px);
}
.split-copy p, .access p, .faq p, .close p, .disk figcaption p {
  margin-top: 16px;
  max-width: 36em;
  color: var(--muted);
}

.tiers { padding: 96px var(--pad) 28px; }
.tiers-head p { margin-top: 12px; color: var(--muted); }
.tier-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  background: var(--white);
}
.tier-row article { padding: 48px 40px 52px; }
.tier-row article + article { border-left: 1px solid var(--line); }
.kicker { font-size: 13px; color: var(--accent); letter-spacing: 0.04em; }
.tier-row h3 { margin-top: 10px; font-size: 28px; }
.price {
  margin: 28px 0 10px;
  font-family: var(--sans);
  font-size: 48px;
  font-weight: 500;
  letter-spacing: -0.04em;
  color: var(--price);
}
.price span { font-size: 16px; color: var(--muted); font-family: var(--sans); font-weight: 400; }
.tier-row article p:last-child { color: var(--muted); }
.disk {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  background: var(--paper-2);
  color: var(--ink);
}
.disk img { height: 460px; }
.disk figcaption { padding: 40px; align-self: end; }
.disk figcaption p { color: var(--muted); }

.access figure img { height: 420px; border-radius: 24px; }
.faq { padding: 96px var(--pad) 40px; }
.faq-list {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow);
}
.faq-list article {
  display: grid;
  grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
  gap: 32px;
  padding: 26px 32px;
  align-items: baseline;
}
.faq-list article + article { border-top: 1px solid var(--line); }
.faq-list h3 { font-size: 18px; }
.faq-list p { margin-top: 0; max-width: none; }
.close {
  margin: 72px var(--pad) 32px;
  padding: 88px 56px;
  border-radius: 18px;
  background:
    radial-gradient(480px 200px at 18% 0%, rgba(130, 186, 245, 0.32), transparent 72%),
    linear-gradient(165deg, #1a3354 0%, #10233c 58%, #0c1b30 100%);
  color: #f4f7fb;
}
.close p { color: rgba(244, 247, 251, 0.72); margin-bottom: 32px; }
.close .btn-solid { background: #f4f7fb; color: var(--ink); }
.close .btn-solid:hover { background: #ffffff; }

.colophon {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 32px var(--pad) 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
.colophon-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
}
.colophon nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.colophon a { text-decoration: none; }
.colophon a:hover { color: var(--ink); }

.hero-copy { animation: rise 0.8s var(--ease) both; }
.hero-frame { animation: rise 0.85s var(--ease) 0.12s both; }
.hero-inset { animation: rise 0.85s var(--ease) 0.26s both; }
.reveal {
  opacity: 0;
  transform: translateY(28px);
  filter: blur(6px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease), filter 0.7s var(--ease);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
  filter: none;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(28px); filter: blur(6px); }
  to { opacity: 1; transform: none; filter: none; }
}
@keyframes drift {
  to { transform: scale(1.16) translate3d(-1.5%, -1%, 0); }
}

@media (max-width: 900px) {
  .mast {
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 14px;
    padding-left: max(14px, env(safe-area-inset-left));
    padding-right: max(14px, env(safe-area-inset-right));
  }
  .mast .mark {
    flex: 1 1 auto;
    min-width: 0;
    font-size: 16px;
    gap: 8px;
  }
  .mast .mark img { flex: 0 0 auto; }
  .mast .mark span {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .mast-tools {
    order: 3;
    flex: 1 1 100%;
    min-width: 0;
    justify-content: flex-start;
    gap: 8px;
  }
  .mast-tools .pick,
  .mast-tools .account-menu { min-width: 0; max-width: 100%; }
  .mast-tools .pick-btn,
  .mast-tools .mast-login {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .mast .pick-list,
  .mast .account-list {
    left: 0;
    right: auto;
    z-index: 40;
    width: max-content;
    min-width: max(100%, 168px);
    max-width: calc(100vw - 36px);
  }
  .mast .pick-list button,
  .mast .account-list a,
  .mast .account-list button {
    white-space: nowrap;
  }
  .nav-toggle {
    display: inline-flex;
    order: 2;
    margin-left: 0;
    flex: 0 0 auto;
    padding: 8px 12px;
  }
  .mast-nav {
    display: none;
    position: static;
    order: 4;
    flex: 1 1 100%;
    width: 100%;
    margin: 0;
    padding: 8px;
    flex-direction: column;
    gap: 4px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
  }
  .mast-nav.is-open { display: flex; }
  .mast-nav.is-open a { color: var(--ink); }
  .mast-nav a { padding: 10px 12px; }
  .hero, .split, .access, .disk, .facts, .tier-row, .faq-list article,
  .os-board, .periods ol, .versus-grid, .band-figures, .included, .included ul, .extra-lines li {
    grid-template-columns: 1fr;
  }
  .band-figures p { border-right: 0; border-top: 1px solid var(--line); }
  .same-board, .use-list li { grid-template-columns: 1fr; gap: 6px; }
  .same-board article + article, .versus-grid article + article { border-left: 0; border-top: 1px solid var(--line); }
  .tier-row article + article { border-left: 0; border-top: 1px solid var(--line); }
  .periods li { border-right: 0; border-top: 1px solid var(--line); }
  .periods li:first-child { border-top: 0; }
  .band-cells div { border-right: 0; border-top: 1px solid var(--line); }
  .os-free { border-right: 0; border-bottom: 1px solid var(--line); }
  .os-win div:first-of-type { margin-top: 12px; }
  .hero { padding: 12px 18px 8px; }
  .hero-stage {
    grid-template-columns: 1fr;
    min-height: 0;
    padding: 32px 18px 22px;
    gap: 22px;
  }
  .hero-copy { max-width: none; }
  .hero-photo { height: 260px; }
  .hero-inset { left: 14px; bottom: 14px; width: 132px; }
  .hero-inset img { height: 88px; }
  .hero-stage::after { display: none; }
  .split-photo img, .disk img, .access figure img { height: 320px; min-height: 0; }
  .facts, .split, .access, .tiers, .faq, .periods { padding-left: 18px; padding-right: 18px; }
  .versus, .systems, .uses, .sheet { grid-template-columns: 1fr; }
  .uses .block-head, .use-list { grid-column: auto; grid-row: auto; }
  .sheet { margin: 0 18px; padding: 22px; }
  .close { margin: 0 18px 32px; padding: 40px 22px; }
  .colophon { padding: 24px 18px 40px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .hero-copy, .hero-frame, .hero-inset, .reveal { opacity: 1; transform: none; filter: none; }
  .hero-photo { transform: none; }
  body { background-attachment: scroll; }
}