/* rbotd.cn — 产品官网样式（静态、零依赖） */
:root {
  --bg: #080b12;
  --bg-2: #0c1120;
  --bg-3: #11182a;
  --text: #f7fbff;
  --muted: #94a3b8;
  --faint: #66748b;
  --line: rgba(255, 255, 255, 0.11);
  --line-strong: rgba(255, 255, 255, 0.19);
  --glass: rgba(255, 255, 255, 0.055);
  --glass-2: rgba(255, 255, 255, 0.085);
  --glass-strong: rgba(12, 18, 32, 0.78);
  --blue: #3b82f6;
  --blue-l: #77b6ff;
  --cyan: #67d9f2;
  --orange: #ff9d5c;
  --green: #46d39a;
  --danger: #f87171;
  --radius: 20px;
  --radius-sm: 12px;
  --blur: 22px;
  --font: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-head: "Space Grotesk", "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease: cubic-bezier(.22, .8, .25, 1);
  --wrap: 1180px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
code { font-family: var(--font-mono); font-size: .88em; color: #cfe4ff; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
img { display: block; max-width: 100%; }
::selection { background: rgba(91, 141, 239, .35); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

/* ── Aurora background ── */
.aurora {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(ellipse 75% 58% at 52% -18%, rgba(37, 99, 235, .30), transparent 70%),
    radial-gradient(ellipse 46% 48% at 95% 38%, rgba(255, 157, 92, .13), transparent 70%),
    radial-gradient(ellipse 50% 48% at 6% 72%, rgba(103, 217, 242, .15), transparent 72%),
    var(--bg);
}
.aurora::after {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.11) .6px, transparent .6px);
  background-size: 7px 7px;
  opacity: .12;
  mix-blend-mode: soft-light;
}
.aurora-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(110px);
  will-change: transform;
  opacity: .9;
}
.aurora-blob--1 { width: 38vw; height: 38vw; top: -14%; left: -8%; background: radial-gradient(circle, rgba(37,99,235,.55), transparent 70%); animation: float-a 18s ease-in-out infinite; }
.aurora-blob--2 { width: 30vw; height: 30vw; bottom: -14%; right: -5%; background: radial-gradient(circle, rgba(255,157,92,.30), transparent 70%); animation: float-a 21s ease-in-out infinite reverse; }
.aurora-blob--3 { width: 25vw; height: 25vw; top: 36%; left: 48%; background: radial-gradient(circle, rgba(168,85,247,.25), transparent 70%); animation: float-a 24s ease-in-out infinite; }
.aurora-blob--4 { width: 33vw; height: 33vw; top: 5%; right: 18%; background: radial-gradient(circle, rgba(103,217,242,.18), transparent 70%); animation: float-a 27s ease-in-out infinite reverse; }
@keyframes float-a {
  0%, 100% { transform: translate3d(0,0,0); }
  33% { transform: translate3d(3vw,-2vh,0); }
  66% { transform: translate3d(-2vw,2vh,0); }
}

.page { position: relative; z-index: 1; }
.wrap { width: min(var(--wrap), calc(100% - 48px)); margin-inline: auto; }
.section { padding: 90px 0; }
.section-tight { padding: 54px 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--cyan); font-size: 12px; font-weight: 600;
  letter-spacing: .12em; text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 20px; height: 1px; background: currentColor; opacity: .6; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.15; margin: 0; letter-spacing: -.025em; }
h2 { font-size: clamp(30px, 4vw, 48px); }
h3 { font-size: 20px; }
p { margin: 0; }
.muted { color: var(--muted); }
.gradient-text {
  background: linear-gradient(100deg, #fff 12%, #b8e7ff 52%, #77b6ff 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 28px; margin-bottom: 34px; }
.section-head p { max-width: 560px; color: var(--muted); }
.section-head .eyebrow { margin-bottom: 12px; }

/* ── Navigation ── */
.nav {
  position: fixed; top: 14px; left: 50%; transform: translateX(-50%);
  z-index: 100;
  width: min(var(--wrap), calc(100% - 32px));
  display: flex; align-items: center; gap: 24px;
  padding: 10px 12px 10px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(8, 12, 21, .62);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  backdrop-filter: blur(18px) saturate(1.2);
  box-shadow: 0 16px 44px rgba(0, 0, 0, .28), inset 0 1px 0 rgba(255,255,255,.06);
  transition: background .2s var(--ease), border-color .2s var(--ease);
}
.nav.is-scrolled { background: rgba(8, 12, 21, .82); border-color: var(--line-strong); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-head); font-size: 18px; font-weight: 700; letter-spacing: -.02em; }
.brand img { width: 30px; height: 30px; border-radius: 8px; box-shadow: 0 6px 18px rgba(59,130,246,.25); }
.brand small { color: var(--faint); font-family: var(--font); font-size: 10px; font-weight: 500; letter-spacing: .08em; margin-left: 2px; }
.nav-links { display: flex; align-items: center; gap: 20px; margin-left: auto; }
.nav-links a { color: var(--muted); font-size: 13.5px; transition: color .16s var(--ease); }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 15px; border-radius: 10px;
  background: linear-gradient(135deg, rgba(119,182,255,.95), rgba(59,130,246,.95));
  color: #06111f !important; font-size: 13px; font-weight: 700;
  box-shadow: 0 8px 22px rgba(59,130,246,.22);
}
.nav-cta:hover { filter: brightness(1.06); }
.nav-toggle {
  display: none; width: 38px; height: 38px; margin-left: auto;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--glass); color: var(--text); cursor: pointer;
}
.nav-toggle span { display: block; width: 16px; height: 1px; margin: 4px auto; background: currentColor; transition: transform .2s; }

/* ── Buttons / badges ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 20px; border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--glass); color: var(--text);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: transform .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease), box-shadow .18s var(--ease);
}
.btn:hover { transform: translateY(-1px); border-color: var(--line-strong); background: var(--glass-2); }
.btn-primary {
  border-color: transparent;
  background: linear-gradient(135deg, #8bd8ee 0%, #5b8def 52%, #3b82f6 100%);
  color: #06111f;
  box-shadow: 0 12px 30px rgba(59,130,246,.24), inset 0 1px 0 rgba(255,255,255,.45);
}
.btn-primary:hover { color: #06111f; filter: brightness(1.06); box-shadow: 0 16px 36px rgba(59,130,246,.30); }
.btn-ghost { border-color: var(--line); background: transparent; color: var(--muted); }
.btn-ghost:hover { color: var(--text); background: var(--glass); }
.btn-sm { min-height: 36px; padding: 0 14px; font-size: 12.5px; border-radius: 9px; }
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 5px 10px; border: 1px solid var(--line);
  border-radius: 999px; background: var(--glass);
  color: var(--muted); font-size: 11.5px; white-space: nowrap;
}
.pill .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 3px rgba(70,211,154,.12); }
.pill--orange .dot { background: var(--orange); box-shadow: 0 0 0 3px rgba(255,157,92,.12); }

/* ── Hero ── */
.hero {
  min-height: 100vh; min-height: 100dvh;
  display: flex; align-items: center;
  padding: 132px 0 72px;
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); align-items: center; gap: 54px; }
.hero-copy .eyebrow { margin-bottom: 18px; }
.hero h1 { font-size: clamp(44px, 6.3vw, 78px); line-height: .99; letter-spacing: -.045em; }
.hero h1 .gradient-text { display: inline; }
.hero-sub { max-width: 590px; margin-top: 24px; color: var(--muted); font-size: clamp(16px, 1.45vw, 18px); line-height: 1.75; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-platforms { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.hero-platforms span { color: var(--faint); font-size: 11.5px; }
.hero-platforms i { width: 1px; height: 12px; background: var(--line); }
.hero-visual { position: relative; }
.hero-window {
  position: relative; overflow: hidden;
  border: 1px solid var(--line-strong); border-radius: 20px;
  background: rgba(14,21,36,.75);
  box-shadow: 0 34px 90px rgba(0,0,0,.44), inset 0 1px 0 rgba(255,255,255,.09);
  transform: perspective(1200px) rotateY(-4deg) rotateX(1.5deg);
  transition: transform .45s var(--ease);
}
.hero-window:hover { transform: perspective(1200px) rotateY(0) rotateX(0); }
.window-bar {
  height: 34px; display: flex; align-items: center; gap: 6px; padding: 0 12px;
  border-bottom: 1px solid var(--line); background: rgba(255,255,255,.035);
}
.window-bar i { width: 7px; height: 7px; border-radius: 50%; background: #ff7a7a; opacity: .8; }
.window-bar i:nth-child(2) { background: #ffd36e; }
.window-bar i:nth-child(3) { background: #5ee2a0; }
.window-bar span { margin-left: 8px; color: var(--faint); font-size: 10.5px; font-family: var(--font-mono); }
.window-bar b { margin-left: auto; color: var(--green); font-size: 10px; font-weight: 500; letter-spacing: .04em; }
.hero-window img { width: 100%; height: auto; }
.hero-float {
  position: absolute; right: -12px; bottom: -22px;
  display: flex; align-items: center; gap: 9px;
  padding: 11px 14px; border: 1px solid var(--line-strong);
  border-radius: 12px; background: var(--glass-strong);
  -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px);
  box-shadow: 0 16px 34px rgba(0,0,0,.32);
  color: var(--muted); font-size: 11.5px;
}
.hero-float strong { color: var(--text); font-size: 12px; }
.hero-float .shield { width: 28px; height: 28px; display: grid; place-items: center; border-radius: 8px; background: rgba(70,211,154,.12); color: var(--green); }

/* ── Trust strip ── */
.trust {
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.018);
}
.trust-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 20px 0; }
.trust-item { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 12.5px; }
.trust-item b { color: var(--text); font-weight: 600; }
.trust-item .ico { width: 26px; height: 26px; display: grid; place-items: center; border-radius: 8px; background: var(--glass); color: var(--cyan); }

/* ── Glass cards ── */
.glass {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.055);
}
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature-card {
  position: relative; overflow: hidden;
  padding: 24px;
  transition: transform .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.feature-card:hover { transform: translateY(-3px); border-color: var(--line-strong); background: var(--glass-2); }
.feature-icon {
  width: 40px; height: 40px; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 11px;
  background: linear-gradient(135deg, rgba(103,217,242,.12), rgba(59,130,246,.10));
  color: var(--cyan); margin-bottom: 18px;
}
.feature-card h3 { font-size: 16px; margin-bottom: 7px; }
.feature-card p { color: var(--muted); font-size: 13px; line-height: 1.7; }
.feature-card .kicker { color: var(--faint); font-size: 10.5px; font-family: var(--font-mono); letter-spacing: .04em; margin-top: 16px; }

/* ── Scenarios ── */
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.scenario-card { padding: 22px; }
.scenario-card .num { color: var(--cyan); font-family: var(--font-mono); font-size: 11px; }
.scenario-card h3 { margin: 14px 0 8px; font-size: 17px; }
.scenario-card p { color: var(--muted); font-size: 13px; }
.scenario-card ul { margin: 16px 0 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.scenario-card li { position: relative; padding-left: 14px; color: var(--muted); font-size: 12px; }
.scenario-card li::before { content: ""; position: absolute; left: 0; top: .7em; width: 5px; height: 5px; border-radius: 50%; background: var(--cyan); opacity: .8; }

/* ── Screenshots ── */
.shot-shell { padding: 12px; }
.shot-tabs { display: flex; align-items: center; gap: 5px; flex-wrap: wrap; padding: 0 4px 12px; }
.shot-tab {
  height: 30px; padding: 0 12px; border-radius: 8px;
  border: 1px solid transparent; background: transparent;
  color: var(--faint); font-size: 12px; cursor: pointer;
}
.shot-tab:hover { color: var(--text); background: var(--glass); }
.shot-tab.is-active { color: var(--text); border-color: var(--line); background: var(--glass-2); }
.shot-frame { position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #0a0e18; }
.shot-frame img { width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; object-position: top center; }
.shot-caption { display: flex; justify-content: space-between; gap: 20px; padding: 12px 4px 2px; color: var(--faint); font-size: 11.5px; }
.shot-caption b { color: var(--muted); font-weight: 500; }
.mobile-note { display: grid; grid-template-columns: 1.25fr .75fr; gap: 14px; margin-top: 14px; }
.mobile-panel { padding: 18px; display: flex; align-items: center; gap: 16px; }
.mobile-panel img { width: 112px; height: auto; border: 1px solid var(--line-strong); border-radius: 12px; box-shadow: 0 16px 34px rgba(0,0,0,.34); }
.mobile-panel h3 { font-size: 16px; margin-bottom: 5px; }
.mobile-panel p { color: var(--muted); font-size: 12px; }
.ui-panel { padding: 22px; display: flex; flex-direction: column; justify-content: space-between; }
.ui-list { display: grid; gap: 7px; margin-top: 16px; }
.ui-list span { position: relative; padding-left: 14px; color: var(--muted); font-size: 11.5px; }
.ui-list span::before { content: ""; position: absolute; left: 0; top: .65em; width: 5px; height: 5px; border-radius: 50%; background: var(--cyan); opacity: .8; }
.ui-panel .swatches { display: flex; gap: 6px; margin-top: 16px; }
.ui-panel .swatches i { width: 26px; height: 26px; border-radius: 8px; border: 1px solid var(--line); }
.ui-panel .swatches i:nth-child(1) { background: #8bd8ee; }
.ui-panel .swatches i:nth-child(2) { background: #3b82f6; }
.ui-panel .swatches i:nth-child(3) { background: #ff9d5c; }
.ui-panel .swatches i:nth-child(4) { background: #0c1120; }

/* ── Quick start ── */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.step-card { padding: 20px; }
.step-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.step-num { width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid var(--line-strong); border-radius: 9px; color: var(--cyan); font-family: var(--font-mono); font-size: 11px; }
.step-card h3 { font-size: 15px; margin-bottom: 6px; }
.step-card p { color: var(--muted); font-size: 12.5px; }
.code-block {
  margin-top: 14px; padding: 16px 18px;
  border: 1px solid var(--line); border-radius: 12px;
  background: rgba(5,9,16,.72); color: #b9c8dd;
  font-family: var(--font-mono); font-size: 12px; line-height: 1.8;
  white-space: pre-wrap;
  overflow-x: auto;
}
.code-block .c { color: #5f728b; }
.code-block .g { color: var(--green); }
.start-note { margin-top: 14px; color: var(--faint); font-size: 11.5px; }

/* ── Download band ── */
.download-band {
  display: flex; align-items: center; justify-content: space-between; gap: 28px;
  padding: 30px 34px; border-radius: 22px;
  border: 1px solid rgba(119,182,255,.22);
  background:
    radial-gradient(600px 220px at 10% 10%, rgba(59,130,246,.18), transparent 70%),
    radial-gradient(500px 220px at 90% 100%, rgba(255,157,92,.12), transparent 70%),
    var(--glass);
  box-shadow: 0 20px 60px rgba(0,0,0,.24), inset 0 1px 0 rgba(255,255,255,.08);
}
.download-band h2 { font-size: clamp(24px, 3vw, 34px); }
.download-band p { color: var(--muted); margin-top: 6px; font-size: 13px; }
.download-band .actions { display: flex; gap: 10px; flex-wrap: wrap; flex: none; }

/* ── FAQ ── */
.faq { display: grid; gap: 8px; width: 100%; }
.faq details { border: 1px solid var(--line); border-radius: 12px; background: var(--glass); }
.faq summary { list-style: none; cursor: pointer; padding: 15px 18px; font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 10px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; margin-left: auto; color: var(--cyan); font-weight: 400; font-size: 18px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { padding: 0 18px 17px; color: var(--muted); font-size: 13px; line-height: 1.75; }

/* ── Footer ── */
.footer { border-top: 1px solid var(--line); padding: 34px 0 26px; margin-top: 40px; }
.footer-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.footer-brand { max-width: 320px; }
.footer-brand p { color: var(--faint); font-size: 12px; margin-top: 10px; line-height: 1.7; }
.footer-cols { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-col h4 { font-size: 11px; color: var(--faint); font-weight: 600; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 10px; }
.footer-col a { display: block; color: var(--muted); font-size: 12px; padding: 3px 0; }
.footer-col a:hover { color: var(--text); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--faint); font-size: 11px; }
.footer-bottom .icp { color: var(--faint); text-decoration: none; }
.footer-bottom .icp:hover { color: var(--text); }
.footer-bottom .police { display: inline-flex; align-items: center; gap: 5px; margin-left: 10px; color: var(--faint); text-decoration: none; vertical-align: middle; white-space: nowrap; }
.footer-bottom .police img { display: block; width: 16px; height: 16px; flex: none; object-fit: contain; }
.footer-bottom .police:hover { color: var(--text); }
.footer--minimal { margin-top: 0; padding: 20px 0; border-top: 0; }

/* ── Download page ── */
.subhero { padding: 132px 0 42px; }
.subhero h1 { font-size: clamp(38px, 5vw, 62px); }
.subhero p { max-width: 620px; color: var(--muted); margin-top: 16px; }
.dl-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.dl-notice { display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px; margin: 22px 0 0; border: 1px solid rgba(255,157,92,.22); border-radius: 10px; background: rgba(255,157,92,.07); color: #ffd4b6; font-size: 12px; }
.download-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 26px; }
.dl-card { padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.dl-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.dl-title { display: flex; align-items: center; gap: 10px; }
.dl-os { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; border: 1px solid var(--line); background: var(--glass-2); color: var(--cyan); }
.dl-title h3 { font-size: 16px; }
.dl-title span { color: var(--faint); font-size: 11px; }
.dl-arch { color: var(--faint); font-family: var(--font-mono); font-size: 10.5px; }
.dl-desc { color: var(--muted); font-size: 12.5px; min-height: 2.6em; }
.dl-foot { display: flex; align-items: center; gap: 10px; margin-top: auto; flex-wrap: wrap; }
.dl-foot .meta { color: var(--faint); font-size: 11px; }
.dl-foot .spacer { flex: 1; }
.dl-card .btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; }
.dl-card.is-unavailable { opacity: .82; }
.dl-card code { color: var(--cyan); font-family: var(--font-mono); font-size: 10.5px; }
.install-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 14px; }
.install-card { padding: 20px; }
.install-card h3 { font-size: 15px; margin-bottom: 8px; }
.install-card p, .install-card li { color: var(--muted); font-size: 12px; }
.install-card ol { margin: 10px 0 0; padding-left: 18px; display: grid; gap: 5px; }
.install-card code { color: var(--cyan); font-family: var(--font-mono); font-size: 11px; }

/* ── 404 ── */
.center-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 100px 0; }
.center-card { max-width: 560px; padding: 40px; text-align: center; }
.center-card .big { font-family: var(--font-head); font-size: 80px; line-height: 1; color: var(--cyan); opacity: .8; }
.center-card h1 { font-size: 26px; margin: 18px 0 8px; }
.center-card p { color: var(--muted); font-size: 13px; margin-bottom: 22px; }

/* ── Reveal / motion ── */
.reveal { opacity: 1; transform: none; }
.reveal.is-in { animation: site-reveal .65s var(--ease) both; }
@keyframes site-reveal { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }

@media (max-width: 980px) {
  .hero { padding-top: 116px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { max-width: 760px; }
  .hero-window { transform: none; }
  .feature-grid, .scenario-grid, .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mobile-note { grid-template-columns: 1fr; }
  .download-band { align-items: flex-start; flex-direction: column; }
  .download-grid, .install-grid { grid-template-columns: 1fr; }
  .trust-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 20px; }
  .footer-cols { gap: 38px; }
}

@media (max-width: 720px) {
  .wrap { width: calc(100% - 28px); }
  .section { padding: 64px 0; }
  .section-tight { padding: 42px 0; }
  .nav { top: 8px; width: calc(100% - 18px); padding: 8px 10px 8px 12px; border-radius: 14px; }
  .brand small { display: none; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: calc(100% + 8px);
    flex-direction: column; align-items: stretch; gap: 2px;
    padding: 10px; border: 1px solid var(--line-strong); border-radius: 14px;
    background: rgba(8,12,21,.94); backdrop-filter: blur(18px);
    box-shadow: 0 20px 44px rgba(0,0,0,.35);
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 10px 12px; border-radius: 8px; }
  .nav-links a:hover { background: var(--glass); }
  .nav-cta { margin-top: 4px; justify-content: center; }
  .hero { padding: 102px 0 46px; }
  .hero h1 { font-size: clamp(40px, 13vw, 58px); }
  .hero-sub { font-size: 15px; margin-top: 18px; }
  .hero-actions .btn { flex: 1 1 150px; }
  .hero-platforms { gap: 6px; }
  .hero-float { right: 10px; bottom: -16px; }
  .feature-grid, .scenario-grid, .steps { grid-template-columns: 1fr; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 14px; }
  .shot-tabs { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 10px; scrollbar-width: none; }
  .shot-tabs::-webkit-scrollbar { display: none; }
  .shot-tab { flex: none; }
  .mobile-panel { align-items: flex-start; }
  .mobile-panel img { width: 92px; }
  .footer-top { flex-direction: column; gap: 26px; }
  .footer-cols { gap: 30px; }
  .download-band { padding: 24px 20px; }
  .download-band .actions { width: 100%; }
  .download-band .actions .btn { flex: 1 1 140px; }
  .subhero { padding-top: 108px; }
  .cta-line { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (prefers-reduced-transparency: reduce) {
  .nav, .hero-float, .glass { backdrop-filter: none; background: #0d1422; }
}

/* ── Release checksums ── */
.checksum-list {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(5, 9, 16, .55);
  overflow: hidden;
}
.checksum-row {
  display: flex; align-items: flex-start; gap: 18px;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 10.5px;
}
.checksum-row:first-child { border-top: none; }
.checksum-row span { flex: 0 0 250px; color: var(--muted); overflow-wrap: anywhere; }
.checksum-row code { color: var(--cyan); font-family: var(--font-mono); overflow-wrap: anywhere; }

@media (max-width: 720px) {
  .checksum-row { flex-direction: column; gap: 4px; }
  .checksum-row span { flex: none; }
}