:root {
  --ink: #f3efee;
  --panel: #ffffff;
  --panel-2: #faf7f6;
  --band: #ebe4e2;
  --line: rgba(200, 120, 112, 0.28);
  --text: #2a1c1b;
  --mute: #7a6460;
  --brand: #e8655d;
  --brand-deep: #d44e46;
  --brand-soft: #ea7670;
  --ok: #2f9e6e;
  --gold: #c9921a;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Syne", "Noto Sans SC", sans-serif;
  --header: 72px;
  --gap: clamp(40px, 8vw, 120px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header); }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(232, 101, 93, 0.1), transparent 45%),
    radial-gradient(ellipse at 90% 8%, rgba(232, 101, 93, 0.06), transparent 40%),
    var(--ink);
  font-family: var(--font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; border: 0; background: none; cursor: pointer; color: inherit; }
img { display: block; max-width: 100%; height: auto; }
ul, ol, p, h1, h2, h3, h4, figure, dl { margin: 0; padding: 0; }
ul, ol { list-style: none; }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; }

.shell {
  width: min(1180px, calc(100% - var(--gap)));
  margin-inline: auto;
}

/* ========== HEADER ========== */
.mast {
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  height: var(--header);
  display: flex;
  align-items: center;
  background: rgba(255, 252, 251, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.mast-inner {
  width: min(1180px, calc(100% - var(--gap)));
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 0 0 1px rgba(232, 101, 93, 0.35);
}
.brand strong {
  display: block;
  font-family: var(--display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brand small {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  color: var(--mute);
  letter-spacing: 0.08em;
}
.nav {
  margin-left: auto;
  display: flex;
  gap: 18px;
  font-size: 13px;
  font-weight: 650;
  color: var(--mute);
}
.nav a:hover { color: var(--brand); }
.mast-cta {
  padding: 10px 16px;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--brand), var(--brand-soft));
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 8px 24px rgba(232, 101, 93, 0.28);
}
.menu {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 20px;
}

/* ========== HERO: mosaic deck ========== */
.hero {
  position: relative;
  padding: calc(var(--header) + 36px) 0 0;
  overflow: hidden;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(232, 101, 93, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 101, 93, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, #000 20%, transparent 90%);
  pointer-events: none;
}
.hero-shell {
  position: relative;
  width: min(1180px, calc(100% - var(--gap)));
  margin-inline: auto;
  display: grid;
  gap: 28px;
}
.hero-top {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-areas:
    "copy side"
    "cta side";
  gap: 20px 28px;
  align-items: start;
}
.hero-copy { grid-area: copy; }
.hero-cta { grid-area: cta; align-self: start; }
.hero-side { grid-area: side; }
.hero-copy .kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 6px 12px;
  border: 1px solid rgba(232, 101, 93, 0.35);
  border-radius: 999px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}
.hero-copy .kicker i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 12px var(--brand);
  animation: pulse 1.6s ease infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
.hero-copy h1 {
  font-family: var(--display);
  font-size: clamp(46px, 8vw, 84px);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 0.98;
}
.hero-copy .lead {
  margin-top: 14px;
  color: var(--gold);
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 800;
}
.hero-copy .desc {
  margin-top: 16px;
  max-width: 36em;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.85;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.hero-meta span {
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(232, 101, 93, 0.06);
  border: 1px solid var(--line);
  font-size: 12px;
  font-weight: 700;
  color: var(--mute);
}
.hero-meta strong { color: var(--text); font-weight: 800; }

.hero-side {
  display: grid;
  gap: 12px;
}
.signal-card {
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, #fff, var(--panel-2));
  box-shadow: 0 10px 28px rgba(42, 28, 27, 0.06);
}
.signal-card header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--mute);
}
.signal-card strong {
  display: block;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.signal-card p {
  margin-top: 6px;
  font-size: 13px;
  color: var(--mute);
}
.signal-card .bars {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-top: 14px;
  height: 42px;
  align-items: end;
}
.signal-card .bars i {
  display: block;
  border-radius: 6px 6px 2px 2px;
  background: linear-gradient(180deg, var(--brand), rgba(232, 101, 93, 0.2));
}
.signal-card .bars i:nth-child(1) { height: 35%; }
.signal-card .bars i:nth-child(2) { height: 55%; }
.signal-card .bars i:nth-child(3) { height: 80%; }
.signal-card .bars i:nth-child(4) { height: 48%; }
.signal-card .bars i:nth-child(5) { height: 68%; }
.signal-card.warn {
  border-color: rgba(232, 101, 93, 0.4);
  background: linear-gradient(160deg, #fff5f4, #fff);
}
.signal-card.warn strong { color: var(--brand-deep); }

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 4px 0 0;
}
.hero-cta a {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 58px;
  padding: 0 22px;
  border-radius: 16px;
  font-size: 15px;
  font-weight: 800;
}
.hero-cta .primary {
  background: linear-gradient(120deg, var(--brand), var(--brand-soft));
  color: #fff;
  box-shadow: 0 14px 36px rgba(232, 101, 93, 0.28);
}
.hero-cta .ghost {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 8px 22px rgba(42, 28, 27, 0.05);
}
.hero-cta small {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  font-weight: 600;
  opacity: 0.72;
}
.hero-cta i { font-size: 22px; }

/* phone mosaic under CTA */
.deck {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 18px;
  margin-top: 8px;
  padding-bottom: 56px;
}
.deck-phone {
  position: relative;
  border-radius: 28px;
  padding: 18px;
  background:
    linear-gradient(145deg, rgba(232, 101, 93, 0.1), transparent 40%),
    var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 16px 40px rgba(42, 28, 27, 0.08);
  overflow: hidden;
}
.deck-phone::before {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -40px;
  top: -60px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 101, 93, 0.18), transparent 70%);
  pointer-events: none;
}
.phone-frame {
  position: relative;
  width: min(280px, 72%);
  margin: 12px auto 8px;
  padding: 12px;
  border-radius: 36px;
  background: #1a1212;
  box-shadow:
    0 0 0 1px rgba(42, 28, 27, 0.12),
    0 24px 48px rgba(42, 28, 27, 0.18);
}
.phone-frame .notch {
  width: 38%;
  height: 10px;
  margin: 0 auto 10px;
  border-radius: 999px;
  background: #2e2222;
}
.phone-frame img {
  width: 100%;
  height: auto;
  border-radius: 24px;
}
.phone-caption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  font-size: 13px;
  color: var(--mute);
}
.phone-caption strong { color: var(--text); }

.deck-stack {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 12px;
}
.mini-shots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.mini-shots figure {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #f0eaea;
}
.mini-shots img { width: 100%; height: auto; }
.mini-shots figcaption {
  padding: 8px 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--mute);
  background: var(--panel-2);
}
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: start;
}
.chip-row span {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(232, 101, 93, 0.05);
  font-size: 12px;
  font-weight: 700;
  color: var(--mute);
}
.chip-row span em {
  color: var(--brand);
  font-style: normal;
}

/* ========== FEATURE STRIP（静止铺满） ========== */
.ticker {
  border-block: 1px solid var(--line);
  background: var(--band);
}
.ticker-track {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px 18px;
  width: min(1180px, calc(100% - var(--gap)));
  margin-inline: auto;
  padding: 16px 0;
}
.ticker-track span {
  flex: 1 1 auto;
  text-align: center;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--mute);
  white-space: nowrap;
}
.ticker-track span b { color: var(--brand); font-weight: 900; }

/* ========== SCENE PICKER ========== */
.scenes {
  padding: 88px 0;
  background: var(--panel-2);
}
.sec-head {
  display: grid;
  gap: 10px;
  margin-bottom: 28px;
}
.sec-head .label {
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}
.sec-head h2 {
  font-family: var(--display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  max-width: 16em;
}
.sec-head p {
  max-width: 40em;
  color: var(--mute);
  font-size: 15px;
}
.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.scene-card {
  position: relative;
  padding: 22px 18px 18px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(42, 28, 27, 0.05);
  min-height: 240px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.scene-card:hover {
  transform: translateY(-4px);
  border-color: rgba(232, 101, 93, 0.45);
}
.scene-card .idx {
  position: absolute;
  top: 14px;
  right: 16px;
  font-family: var(--display);
  font-size: 28px;
  font-weight: 800;
  color: rgba(232, 101, 93, 0.16);
}
.scene-card i {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(232, 101, 93, 0.12);
  color: var(--brand);
  font-size: 22px;
  margin-bottom: 16px;
}
.scene-card:nth-child(2) i { background: rgba(245, 197, 66, 0.12); color: var(--gold); }
.scene-card:nth-child(3) i { background: rgba(232, 101, 93, 0.12); color: var(--brand-soft); }
.scene-card:nth-child(4) i { background: rgba(232, 101, 93, 0.12); color: #f0a09a; }
.scene-card h3 {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 8px;
}
.scene-card p {
  font-size: 13px;
  color: var(--mute);
  flex: 1;
}
.scene-card .tag {
  margin-top: 16px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--brand);
}

/* ========== BENTO MAP ========== */
.bento {
  padding: 72px 0 88px;
  background: var(--ink);
}
.bento-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 14px;
}
.bento-cell {
  border-radius: 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(42, 28, 27, 0.05);
  padding: 22px;
  overflow: hidden;
  position: relative;
}
.bento-cell.wide {
  grid-column: 1 / 2;
  grid-row: 1 / 3;
  background:
    linear-gradient(160deg, rgba(232, 101, 93, 0.1), transparent 45%),
    var(--panel);
}
.bento-cell.accent {
  background: linear-gradient(145deg, #fff7f6, #fff);
}
.bento-cell.coral {
  background: linear-gradient(145deg, #fff1ef, #fff);
  border-color: rgba(232, 101, 93, 0.35);
}
.bento-cell h3 {
  font-size: 20px;
  font-weight: 900;
  margin: 8px 0 10px;
}
.bento-cell p { color: var(--mute); font-size: 14px; }
.bento-cell .badge {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  background: rgba(232, 101, 93, 0.15);
  color: var(--brand);
}
.bento-cell.coral .badge {
  background: rgba(232, 101, 93, 0.14);
  color: var(--brand-deep);
}
.bento-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}
.bento-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px;
  border-radius: 14px;
  background: rgba(232, 101, 93, 0.05);
  border: 1px solid var(--line);
  font-size: 13px;
}
.bento-list li i {
  color: var(--brand);
  font-size: 16px;
  margin-top: 2px;
}
.bento-stat {
  display: flex;
  gap: 18px;
  margin-top: 20px;
  flex-wrap: wrap;
}
.bento-stat div {
  min-width: 88px;
}
.bento-stat b {
  display: block;
  font-family: var(--display);
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--brand);
  line-height: 1;
}
.bento-stat span {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--mute);
}

/* ========== COMPARE ========== */
.compare {
  padding: 72px 0;
  background: var(--band);
  border-block: 1px solid var(--line);
}
.compare-table {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 24px;
  overflow: hidden;
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(42, 28, 27, 0.05);
}
.compare-table > div {
  padding: 22px 18px;
  border-right: 1px solid var(--line);
}
.compare-table > div:last-child { border-right: 0; }
.compare-table .head {
  background: var(--panel-2);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--mute);
}
.compare-table .head.plus { color: var(--brand); }
.compare-table .row-label {
  font-weight: 800;
  font-size: 14px;
}
.compare-table .ok { color: var(--ok); font-weight: 800; }
.compare-table .lock { color: var(--brand-deep); font-weight: 800; }
.compare-table .muted { color: var(--mute); font-size: 13px; }

/* ========== SCREEN STAGE ========== */
.stage {
  padding: 88px 0;
  background: var(--panel-2);
}
.stage-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 28px;
  align-items: center;
}
.stage-tabs {
  display: grid;
  gap: 10px;
}
.stage-tab {
  text-align: left;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.stage-tab.is-on {
  border-color: rgba(232, 101, 93, 0.5);
  background: linear-gradient(120deg, rgba(232, 101, 93, 0.12), transparent);
}
.stage-tab b {
  display: block;
  font-size: 12px;
  color: var(--brand);
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}
.stage-tab strong {
  display: block;
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 4px;
}
.stage-tab span {
  font-size: 13px;
  color: var(--mute);
}
.stage-view {
  border-radius: 28px;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 70% 20%, rgba(232, 101, 93, 0.15), transparent 45%),
    var(--panel);
  padding: 28px;
  display: grid;
  place-items: center;
}
.stage-view img {
  width: min(300px, 100%);
  height: auto;
  border-radius: 28px;
  box-shadow: 0 22px 44px rgba(42, 28, 27, 0.16);
}

/* ========== LADDER ========== */
.ladder {
  padding: 72px 0 88px;
  background: var(--ink);
}
.ladder-rail {
  display: grid;
  gap: 0;
  border-left: 2px solid rgba(232, 101, 93, 0.25);
  margin-left: 18px;
}
.ladder-step {
  position: relative;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px;
  padding: 0 0 36px 36px;
}
.ladder-step::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(232, 101, 93, 0.2);
}
.ladder-step .n {
  font-family: var(--display);
  font-size: 42px;
  font-weight: 800;
  color: rgba(232, 101, 93, 0.18);
  line-height: 1;
}
.ladder-step h3 {
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 8px;
}
.ladder-step p { color: var(--mute); font-size: 14px; max-width: 42em; }
.ladder-step .hint {
  display: inline-flex;
  margin-top: 10px;
  padding: 6px 10px;
  border-radius: 8px;
  background: rgba(232, 101, 93, 0.1);
  color: var(--brand);
  font-size: 12px;
  font-weight: 700;
}

/* ========== VOICES ========== */
.voices {
  padding: 88px 0;
  background: var(--band);
}
.voices .sec-head .label { color: var(--brand-deep); }
.voices .sec-head p { color: var(--mute); }
.voice-wall {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}
.voice {
  grid-column: span 4;
  padding: 22px;
  border-radius: 22px;
  background: #fff;
  border: 1px solid #eadcda;
  box-shadow: 0 12px 30px rgba(40, 18, 16, 0.06);
}
.voice:nth-child(1) { grid-column: span 5; }
.voice:nth-child(2) { grid-column: span 7; margin-top: 28px; }
.voice:nth-child(3) { grid-column: span 7; }
.voice:nth-child(4) { grid-column: span 5; margin-top: -20px; }
.voice:nth-child(5) { grid-column: span 4; }
.voice:nth-child(6) { grid-column: span 8; }
.voice time {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--mute);
}
.voice strong {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
  font-weight: 900;
  color: var(--text);
}
.voice p {
  font-size: 14px;
  line-height: 1.8;
  color: #4f3a38;
}

/* ========== FAQ ========== */
.faq {
  padding: 88px 0;
  background: var(--panel-2);
}
.faq-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 36px;
  align-items: start;
}
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}
.faq summary {
  cursor: pointer;
  list-style: none;
  font-weight: 800;
  font-size: 16px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  color: var(--brand);
  font-size: 22px;
  font-weight: 400;
}
.faq details[open] summary::after { content: "–"; }
.faq details p {
  margin-top: 10px;
  color: var(--mute);
  font-size: 14px;
  max-width: 48em;
}

/* ========== END ========== */
.end {
  padding: 72px 0 96px;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(232, 101, 93, 0.12), transparent 55%),
    var(--panel-2);
  border-top: 1px solid var(--line);
}
.end h2 {
  font-family: var(--display);
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.03em;
}
.end p {
  margin: 12px auto 28px;
  max-width: 32em;
  color: var(--mute);
}
.end-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.end-actions a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 14px;
  font-weight: 800;
}
.end-actions .primary {
  background: linear-gradient(120deg, var(--brand), var(--brand-soft));
  color: #fff;
}
.end-actions .ghost {
  border: 1px solid var(--line);
}

.foot {
  padding: 36px var(--gap) 48px;
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 13px;
}
.foot-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  color: var(--text);
  font-weight: 800;
}
.foot-brand img { width: 28px; height: 28px; border-radius: 8px; }
.foot nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 14px 0 10px;
}
.foot nav a:hover { color: var(--brand); }

#interaction-complaint-button {
  color: #1f2430 !important;
  font-weight: 700;
}
#interaction-complaint-button:hover { color: #1f2430 !important; }

.backtop {
  position: fixed;
  right: 24px;
  bottom: 84px;
  z-index: 40;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.backtop.on { opacity: 1; pointer-events: auto; }

.fade {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade.in { opacity: 1; transform: none; }

@media (max-width: 980px) {
  .nav { display: none; }
  .nav.open {
    display: flex;
    position: absolute;
    top: var(--header);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 10px;
    background: #fff;
    border-bottom: 1px solid var(--line);
  }
  .nav a { padding: 12px; color: var(--text); }
  .menu { display: grid; place-items: center; margin-left: auto; }
  .mast-cta { display: none; }
  .hero-top {
    grid-template-columns: 1fr;
    grid-template-areas:
      "copy"
      "cta"
      "side";
    gap: 18px;
  }
  .hero-cta {
    padding: 0;
    justify-content: stretch;
  }
  .hero-cta a {
    flex: 1 1 100%;
    justify-content: center;
  }
  .deck,
  .scene-grid,
  .bento-grid,
  .compare-table,
  .stage-layout,
  .faq-grid,
  .ladder-step {
    grid-template-columns: 1fr;
  }
  .bento-cell.wide {
    grid-column: auto;
    grid-row: auto;
  }
  .compare-table > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .compare-table > div:last-child { border-bottom: 0; }
  .voice-wall { grid-template-columns: 1fr; }
  .voice,
  .voice:nth-child(n) {
    grid-column: auto;
    margin-top: 0;
  }
  .mini-shots { grid-template-columns: 1fr 1fr; }
  .backtop { right: 16px; bottom: 76px; }
  .ladder-rail { margin-left: 10px; }
  .ladder-step { padding-left: 28px; }
}