/* ============================================================
   robloxgame.cn — Roblox 三端下载落地页
   浅色主题 / 参考 counterflame.cn 的版式结构
   ============================================================ */

:root {
  color-scheme: light;

  --bg: #f6f7fb;
  --bg-deep: #eef0f7;
  --panel: #ffffff;
  --panel-soft: #fbfbfe;

  --ink: #14161c;
  --ink-2: #3b4050;
  --muted: #6b7183;
  --muted-2: #8b90a0;

  --line: #e4e6ef;
  --line-strong: #d3d7e4;

  --red: #e2231a;
  --red-hot: #ff4b3e;
  --red-deep: #c01a12;
  --red-soft: #fff0ee;

  --blue: #1668ff;
  --amber: #ff9a1f;

  --shadow-sm: 0 1px 2px rgba(20, 22, 30, .05);
  --shadow-md: 0 18px 40px -26px rgba(20, 22, 30, .38);
  --shadow-lg: 0 34px 70px -34px rgba(20, 22, 30, .46);

  --radius: 16px;
  --radius-lg: 22px;

  --font-sans: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-display: "Segoe UI Semibold", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  overflow-x: clip;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  background-color: var(--bg);
  background-image:
    radial-gradient(920px 520px at 6% -12%, rgba(226, 35, 26, .10), transparent 64%),
    radial-gradient(820px 480px at 102% 2%, rgba(22, 104, 255, .09), transparent 62%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overflow-x: clip;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
svg { display: block; }

.container {
  width: min(1160px, calc(100% - 48px));
  margin-inline: auto;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 200;
  padding: 10px 16px; border-radius: 10px;
  background: var(--ink); color: #fff; font-size: 14px;
  transition: top .2s;
}
.skip-link:focus { top: 12px; }

:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
  border-radius: 4px;
}

.svg-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 20px; height: 20px; flex: none; }

/* ---------------- buttons ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
  white-space: nowrap;
}

.btn-lg { padding: 15px 26px; font-size: 16px; border-radius: 13px; }

.btn-primary {
  color: #fff;
  background: linear-gradient(180deg, #ff3f32, var(--red) 58%, #cf1d15);
  border-color: #c71a12;
  box-shadow: 0 12px 26px -14px rgba(226, 35, 26, .85), inset 0 1px 0 rgba(255, 255, 255, .28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 32px -14px rgba(226, 35, 26, .9), inset 0 1px 0 rgba(255, 255, 255, .3); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: rgba(255, 255, 255, .9);
  border-color: var(--line-strong);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:hover { border-color: #b9bfd2; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost .icon { transition: transform .2s; }
.btn-ghost:hover .icon { transform: translateX(3px); }

.btn-white {
  background: #fff;
  color: #cf1d15;
  border-color: rgba(255, 255, 255, .6);
  box-shadow: 0 16px 30px -18px rgba(0, 0, 0, .55);
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 22px 38px -18px rgba(0, 0, 0, .6); }

/* ---------------- header ---------------- */

.site-nav-bar {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(255, 255, 255, .82);
  border-bottom: 1px solid rgba(228, 230, 239, .9);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  transition: box-shadow .25s, background .25s;
}
.site-nav-bar.is-stuck {
  box-shadow: 0 10px 30px -22px rgba(20, 22, 30, .5);
  background: rgba(255, 255, 255, .94);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 74px;
}

.logo-link { display: inline-flex; align-items: center; gap: 11px; }
.logo-mark { width: 40px; height: 40px; border-radius: 12px; box-shadow: 0 8px 18px -10px rgba(226, 35, 26, .8); }
.logo-copy { display: flex; flex-direction: column; line-height: 1.05; }
.logo-copy strong {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .04em;
}
.logo-copy small {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .22em;
  color: var(--muted-2);
  margin-top: 3px;
}

.site-nav { display: flex; align-items: center; }
.site-nav-inner { display: flex; align-items: center; gap: 6px; }
.site-nav-inner > a {
  padding: 8px 14px;
  border-radius: 9px;
  font-size: 14.5px;
  color: var(--ink-2);
  transition: color .18s, background .18s;
}
.site-nav-inner > a:hover { color: var(--red); background: var(--red-soft); }
.nav-download { margin-left: 8px; padding: 10px 18px; font-size: 14.5px; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 11px;
  border: 1px solid var(--line-strong);
  background: #fff;
  cursor: pointer;
  padding: 0;
  place-items: center;
  gap: 4px;
  flex-direction: column;
}
.nav-toggle-bar {
  display: block;
  width: 18px; height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform .25s, opacity .2s;
}
body.nav-open .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
body.nav-open .nav-toggle-bar:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-backdrop {
  position: fixed; inset: 0; z-index: 70;
  background: rgba(14, 16, 22, .42);
  opacity: 0; pointer-events: none;
  transition: opacity .25s;
  backdrop-filter: blur(3px);
}
body.nav-open .nav-backdrop { opacity: 1; pointer-events: auto; }

/* ---------------- hero ---------------- */

.hero { position: relative; padding: 62px 0 88px; overflow: hidden; }

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(20, 22, 30, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 22, 30, .045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(720px 420px at 62% 22%, #000 8%, transparent 72%);
  -webkit-mask-image: radial-gradient(720px 420px at 62% 22%, #000 8%, transparent 72%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  align-items: center;
  gap: 56px;
}

.hero-copy { position: relative; z-index: 1; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .17em;
  text-transform: uppercase;
  color: var(--red);
}
.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--red-hot);
  box-shadow: 0 0 0 4px rgba(226, 35, 26, .13);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(226, 35, 26, .13); }
  50% { box-shadow: 0 0 0 7px rgba(226, 35, 26, .05); }
}

.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 20px; }
.hero-badge {
  font-size: 12.5px;
  color: var(--ink-2);
  background: rgba(255, 255, 255, .9);
  border: 1px solid var(--line);
  padding: 5px 11px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

.hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(40px, 4.7vw, 62px);
  font-weight: 800;
  line-height: 1.07;
  letter-spacing: -.035em;
}
.hero h1 .accent { color: var(--red); }
.hero-title-line { display: inline-block; }

.hero-subtitle {
  max-width: 520px;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--muted);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 32px; }

.hero-specs {
  display: flex;
  max-width: 540px;
  margin: 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.hero-specs span {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 18px;
  border-left: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .01em;
}
.hero-specs span:first-child { padding-left: 0; border-left: 0; }
.hero-specs strong {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--ink);
}

/* ---------------- hero media / monitor ---------------- */

.hero-media { position: relative; z-index: 1; }

.monitor {
  position: relative;
  padding: 8px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg), inset 0 1px 0 #fff;
}

.monitor-frame {
  border-radius: 14px;
  overflow: hidden;
  background: #0e1016;
}

.monitor-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, .07);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: #7f889b;
}
.monitor-label { display: inline-flex; align-items: center; gap: 7px; color: #e9ecf3; }
.monitor-label i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--red-hot);
  box-shadow: 0 0 8px rgba(255, 75, 62, .9);
  animation: pulse 2s infinite;
}
.monitor-location {
  flex: 1;
  color: #c4cbd9;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.monitor-time { color: #626c80; }

.carousel { position: relative; }
.carousel-viewport { overflow: hidden; }
.carousel-track {
  display: flex;
  transition: transform .62s cubic-bezier(.22, .61, .36, 1);
  will-change: transform;
}
.carousel-slide {
  position: relative;
  flex: 0 0 100%;
  margin: 0;
  aspect-ratio: 16 / 9;
  background: #0e1016;
}
.carousel-slide img { width: 100%; height: 100%; object-fit: cover; }

.carousel-slide figcaption {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  align-items: flex-end;
  gap: 11px;
  padding: 38px 18px 15px;
  color: #fff;
  background: linear-gradient(to top, rgba(6, 8, 12, .86), rgba(6, 8, 12, .18) 62%, transparent);
}
.carousel-slide figcaption span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1;
  padding: 4px 5px;
  border: 1px solid rgba(255, 141, 132, .55);
  border-radius: 4px;
  color: #ff9c94;
}
.carousel-slide figcaption strong { display: block; font-size: 14.5px; font-weight: 600; letter-spacing: .01em; }
.carousel-slide figcaption small { display: block; margin-top: 2px; font-size: 11.5px; color: #b7bfd0; }

.carousel-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: #12141b;
  border-top: 1px solid rgba(255, 255, 255, .06);
}
.carousel-dots { display: flex; align-items: center; gap: 6px; }
.carousel-dot {
  width: 6px; height: 6px;
  padding: 0;
  border: 0;
  border-radius: 99px;
  background: #3b4254;
  cursor: pointer;
  transition: width .25s, background .25s;
}
.carousel-dot:hover { background: #59617a; }
.carousel-dot.is-active { width: 20px; background: var(--red-hot); }

.carousel-nav { display: flex; gap: 6px; }
.carousel-arrow {
  display: grid;
  place-items: center;
  width: 28px; height: 28px;
  border-radius: 8px;
  border: 1px solid #2a3040;
  background: #181b24;
  color: #c3cad9;
  cursor: pointer;
  transition: border-color .18s, color .18s, background .18s;
}
.carousel-arrow:hover { border-color: rgba(255, 75, 62, .7); color: #fff; background: #1f2330; }
.carousel-arrow .icon { width: 15px; height: 15px; }

.monitor-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 14px;
  background: #0b0d12;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .11em;
  text-transform: uppercase;
  color: #626c80;
}
.monitor-foot .monitor-coords { color: #8a94a8; }

.media-corner {
  position: absolute;
  width: 24px; height: 24px;
  border: 2px solid var(--red);
  opacity: .8;
  pointer-events: none;
}
.media-corner-tl { top: -9px; left: -9px; border-right: 0; border-bottom: 0; border-radius: 4px 0 0 0; }
.media-corner-br { right: -9px; bottom: -9px; border-left: 0; border-top: 0; border-radius: 0 0 4px 0; }

.media-chip {
  position: absolute;
  left: -10px;
  bottom: -42px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 13px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 18px 34px -20px rgba(20, 22, 30, .45);
}
.media-chip .chip-icon {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 9px;
  background: var(--red-soft);
  color: var(--red);
}
.media-chip .chip-icon .icon { width: 17px; height: 17px; }
.media-chip b { display: block; font-size: 15px; line-height: 1.1; letter-spacing: -.01em; }
.media-chip small { display: block; font-size: 11px; color: var(--muted); margin-top: 2px; }

/* ---------------- section basics ---------------- */

.section { padding: 92px 0; }
.section-head { max-width: 660px; margin-bottom: 44px; }
.section-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--red);
}
.section-head h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(27px, 3.1vw, 38px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.03em;
}
.section-head p { margin: 0; font-size: 15px; color: var(--muted); }

/* ---------------- features ---------------- */

.features {
  padding: 88px 0;
  background: #fff;
  border-block: 1px solid var(--line);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  position: relative;
  overflow: hidden;
  padding: 26px 24px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(226, 35, 26, .32);
  box-shadow: 0 28px 46px -34px rgba(20, 22, 30, .5);
}
.card-index {
  position: absolute;
  top: 14px; right: 18px;
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: #f2f3f8;
  transition: color .22s;
}
.feature-card:hover .card-index { color: #ffe4e1; }

.feature-icon {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  margin-bottom: 18px;
  border-radius: 11px;
  border: 1px solid rgba(226, 35, 26, .16);
  background: var(--red-soft);
  color: var(--red);
}
.feature-icon .icon { width: 21px; height: 21px; }

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 18.5px;
  font-weight: 700;
  letter-spacing: -.015em;
  line-height: 1.4;
}
.feature-card p { margin: 0; font-size: 14.5px; line-height: 1.82; color: var(--muted); }

.feature-note {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 26px 0 0;
  padding: 13px 17px;
  border: 1px dashed var(--line-strong);
  border-radius: 12px;
  font-size: 13.5px;
  color: var(--muted);
  background: var(--panel-soft);
}
.feature-note span {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--red);
}

/* ---------------- modes ---------------- */

.modes { padding: 92px 0; }

.modes-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.04fr);
  align-items: center;
  gap: 56px;
}

.modes-copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(27px, 3.1vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.03em;
}
.modes-copy > p { margin: 0; max-width: 460px; font-size: 15px; line-height: 1.85; color: var(--muted); }

.modes-list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.modes-list li {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 15px 6px;
  border-bottom: 1px solid var(--line);
  transition: padding-left .2s, background .2s;
}
.modes-list li:hover { padding-left: 12px; background: rgba(255, 255, 255, .7); }
.modes-list .mode-num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--red);
}
.modes-list strong { font-size: 15.5px; font-weight: 600; letter-spacing: -.01em; }
.modes-list small { font-size: 12px; color: var(--muted-2); }

.modes-visual { position: relative; }
.modes-frame {
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-md);
}
.modes-frame img {
  width: 100%;
  border-radius: 14px;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}
.modes-caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 10px 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.modes-caption b { color: var(--ink-2); font-weight: 600; }

/* ---------------- reviews ---------------- */

.reviews {
  padding: 88px 0;
  background: #fff;
  border-block: 1px solid var(--line);
}

.reviews-top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 34px;
  flex-wrap: wrap;
}
.reviews-top .section-head { margin-bottom: 0; }

.rating-summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-soft);
}
.rating-summary strong {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.03em;
}
.rating-meta { display: flex; flex-direction: column; gap: 4px; }
.rating-meta small { font-size: 12px; color: var(--muted); }

.stars { display: inline-flex; align-items: center; gap: 2px; color: var(--amber); }
.stars .icon { width: 14px; height: 14px; fill: currentColor; stroke: none; }

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.review-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: transform .22s, box-shadow .22s, border-color .22s;
}
.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 26px 44px -34px rgba(20, 22, 30, .5);
}
.review-head { display: flex; align-items: center; gap: 11px; }
.review-head .stars { margin-left: auto; }
.avatar {
  display: grid;
  place-items: center;
  width: 38px; height: 38px;
  flex: none;
  border-radius: 50%;
  font-size: 13.5px;
  font-weight: 700;
  color: #fff;
  letter-spacing: .02em;
  background: linear-gradient(140deg, #ff7a5c, var(--red));
  box-shadow: inset 0 -6px 12px rgba(0, 0, 0, .12);
}
.avatar.a2 { background: linear-gradient(140deg, #6ea8ff, #1668ff); }
.avatar.a3 { background: linear-gradient(140deg, #ffd166, #f08c00); }
.avatar.a4 { background: linear-gradient(140deg, #8f7bff, #5b3df5); }
.avatar.a5 { background: linear-gradient(140deg, #4ad6a8, #12a05f); }
.avatar.a6 { background: linear-gradient(140deg, #ff8ab5, #e83e8c); }

.review-who strong { display: block; font-size: 14.5px; font-weight: 600; line-height: 1.3; }
.review-who small { display: block; font-size: 11.5px; color: var(--muted-2); margin-top: 2px; }

.review-card blockquote {
  margin: 0;
  flex: 1;
  font-size: 14.5px;
  line-height: 1.86;
  color: var(--ink-2);
}
.review-card blockquote em { font-style: normal; color: var(--ink); font-weight: 600; }

.review-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 11.5px;
  color: var(--muted-2);
}
.review-tag {
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--red-soft);
  color: var(--red);
  font-size: 10.5px;
  letter-spacing: .02em;
}

/* ---------------- faq ---------------- */

.faq { padding: 88px 0; }
.faq-container { max-width: 860px; margin-inline: auto; }
.faq .section-head { margin-bottom: 30px; }

.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  position: relative;
  padding: 19px 44px 19px 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -.01em;
  cursor: pointer;
  list-style: none;
  transition: color .18s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "";
  position: absolute;
  right: 8px; top: 50%;
  width: 10px; height: 10px;
  border-right: 2px solid var(--muted-2);
  border-bottom: 2px solid var(--muted-2);
  transform: translateY(-70%) rotate(45deg);
  transition: transform .25s, border-color .25s;
}
.faq-item[open] summary { color: var(--red); }
.faq-item[open] summary::after {
  transform: translateY(-30%) rotate(-135deg);
  border-color: var(--red);
}
.faq-item p {
  margin: 0 0 20px;
  padding-right: 40px;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--muted);
}

/* ---------------- cta ---------------- */

.cta-banner { padding: 0 0 84px; }

.cta-panel {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  padding: 52px 56px;
  border-radius: 26px;
  color: #fff;
  background: linear-gradient(118deg, #d61f16 0%, #ef3026 42%, #ff6a3d 100%);
  box-shadow: 0 34px 60px -40px rgba(198, 26, 16, .9);
}
.cta-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(115deg, rgba(255, 255, 255, .07) 0 2px, transparent 2px 15px);
  pointer-events: none;
}
.cta-panel::after {
  content: "";
  position: absolute;
  right: -70px; top: -90px;
  width: 340px; height: 340px;
  border-radius: 50%;
  border: 42px solid rgba(255, 255, 255, .08);
  pointer-events: none;
}
.cta-copy { position: relative; z-index: 1; }
.cta-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .78);
}
.cta-copy h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.1vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.03em;
}
.cta-copy h2 b { font-weight: 800; }
.cta-copy p { margin: 0; font-size: 14px; color: rgba(255, 255, 255, .82); }

.cta-actions { position: relative; z-index: 1; flex: none; }

/* ---------------- footer ---------------- */

.site-footer {
  padding: 44px 0 36px;
  background: #fff;
  border-top: 1px solid var(--line);
}
.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand img { width: 30px; height: 30px; border-radius: 9px; }
.footer-brand strong { font-size: 15px; letter-spacing: .04em; }
.footer-brand small {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--muted-2);
  letter-spacing: .12em;
  margin-left: 4px;
}
.footer-nav { display: flex; flex-wrap: wrap; gap: 20px; font-size: 13.5px; color: var(--muted); }
.footer-nav a:hover { color: var(--red); }

.footer-copy { margin: 22px 0 8px; font-size: 12.5px; color: var(--muted); }
.footer-disclaimer { margin: 0; max-width: 780px; font-size: 11.5px; line-height: 1.8; color: var(--muted-2); }

/* ---------------- modal ---------------- */

.download-modal {
  width: min(468px, calc(100vw - 32px));
  max-width: none;
  padding: 0;
  border: 0;
  background: transparent;
  overflow: visible;
}
.download-modal::backdrop {
  background: rgba(14, 16, 22, .55);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}
.download-modal[open] .download-modal-panel { animation: modal-in .28s cubic-bezier(.2, .8, .3, 1); }
@keyframes modal-in {
  from { opacity: 0; transform: translateY(14px) scale(.985); }
  to { opacity: 1; transform: none; }
}

.download-modal-panel {
  position: relative;
  padding: 30px;
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 40px 90px -30px rgba(0, 0, 0, .55);
}
.download-modal-close {
  position: absolute;
  top: 14px; right: 14px;
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: color .18s, border-color .18s;
}
.download-modal-close:hover { color: var(--ink); border-color: var(--line-strong); }

.modal-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .17em;
  text-transform: uppercase;
  color: var(--red);
}
.download-modal-panel h2 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -.025em;
}
.download-modal-subtitle { margin: 0; font-size: 12.5px; color: var(--muted); }

.download-buttons { display: grid; gap: 10px; margin: 22px 0 16px; }
.store-card {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #fff;
  transition: border-color .18s, transform .18s, box-shadow .18s;
}
.store-card:hover {
  border-color: rgba(226, 35, 26, .45);
  transform: translateX(3px);
  box-shadow: 0 14px 26px -22px rgba(20, 22, 30, .5);
}
.store-icon {
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  flex: none;
  border-radius: 11px;
  background: #eef2f9;
  color: var(--ink);
}
.store-icon .icon { width: 21px; height: 21px; }
.store-android .store-icon { background: #e9f9ef; color: #12a150; }
.store-ios .store-icon { background: #eef1f7; color: #1b1d24; }
.store-windows .store-icon { background: #e9f1ff; color: var(--blue); }

.store-copy strong { display: block; font-size: 14.5px; font-weight: 600; line-height: 1.3; }
.store-copy small { display: block; font-size: 11.5px; color: var(--muted); margin-top: 2px; }
.store-arrow { margin-left: auto; color: var(--muted-2); transition: transform .18s, color .18s; }
.store-card:hover .store-arrow { transform: translateX(3px); color: var(--red); }

.modal-note {
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-soft);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}
.modal-note span {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .15em;
  color: var(--red);
}
.modal-foot { margin: 13px 0 0; font-size: 11.5px; color: var(--muted-2); text-align: center; }

/* ---------------- 简洁内容页 ---------------- */

.page-hero { padding: 54px 0 10px; }
.page-hero .section-kicker { margin-bottom: 10px; }
.page-hero h1 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.2;
}
.page-hero p { margin: 0; max-width: 640px; color: var(--muted); font-size: 14.5px; }
.page-updated {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--muted-2);
}
.page-body { padding: 30px 0 80px; }
.prose { max-width: 780px; }
.prose h2 {
  margin: 34px 0 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
}
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { font-size: 14.5px; line-height: 1.9; color: var(--muted); }
.prose p { margin: 0 0 12px; }
.prose ul { margin: 0 0 14px; padding-left: 20px; }
.prose li { margin-bottom: 6px; }
.prose a { color: var(--red); text-decoration: underline; text-underline-offset: 3px; }
.prose strong { color: var(--ink-2); }
.prose .note-box {
  margin: 22px 0;
  padding: 14px 17px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  border-radius: 10px;
  background: var(--panel-soft);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}
.prose .note-box b { color: var(--ink-2); }
.contact-list { list-style: none; margin: 6px 0 0; padding: 0; }
.contact-list li {
  display: flex;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  color: var(--muted);
}
.contact-list b {
  flex: none;
  width: 84px;
  color: var(--ink-2);
  font-weight: 600;
}

/* ---------------- reveal ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s cubic-bezier(.22, .61, .36, 1);
  transition-delay: var(--d, 0ms);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------------- responsive ---------------- */

@media (max-width: 1080px) {
  .hero-inner { gap: 36px; }
  .hero h1 { font-size: clamp(36px, 4.4vw, 52px); }
  .media-chip { display: none; }
  .cta-panel { padding: 44px 40px; }
}

@media (max-width: 960px) {
  .hero { padding: 44px 0 68px; }
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero-media { max-width: 620px; }
  .hero-specs { max-width: none; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .reviews-grid { grid-template-columns: 1fr 1fr; }
  .modes-inner { grid-template-columns: 1fr; gap: 36px; }
  .modes-copy > p { max-width: none; }
  .section { padding: 72px 0; }
  .features, .reviews { padding: 70px 0; }
  .cta-panel { flex-direction: column; align-items: flex-start; gap: 26px; }
}

@media (max-width: 880px) {
  .nav-toggle { display: flex; position: relative; z-index: 3; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 2;
    display: block;
    width: 100%;
    padding: 10px 16px 18px;
    background: #fff;
    border-top: 1px solid var(--line);
    box-shadow: 0 26px 44px -30px rgba(0, 0, 0, .45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
  }
  body.nav-open .site-nav { opacity: 1; visibility: visible; transform: none; }
  body.nav-open { overflow: hidden; }
  .site-nav-inner { flex-direction: column; align-items: stretch; gap: 2px; }
  .site-nav-inner > a { padding: 13px 12px; font-size: 15.5px; border-radius: 10px; }
  .nav-download { margin: 12px 0 0; width: 100%; justify-content: center; padding: 14px 18px; }
}

@media (max-width: 720px) {
  .container { width: calc(100% - 36px); }
  .hero h1 { font-size: clamp(33px, 8.4vw, 44px); }
  .hero-badges { margin: 16px 0 18px; }
  .hero-subtitle { font-size: 15px; }
  .hero-specs { flex-wrap: wrap; gap: 14px 0; }
  .hero-specs span { flex: 1 1 33%; padding-left: 12px; }
  .hero-specs span:nth-child(2) { padding-left: 12px; }
  .hero-actions .btn { flex: 1 1 auto; }
  .monitor-location { display: none; }
  .features-grid, .reviews-grid { grid-template-columns: 1fr; }
  .reviews-top { align-items: flex-start; }
  .faq-item p { padding-right: 0; }
  .cta-panel { padding: 34px 26px; border-radius: 20px; }
  .cta-copy h2 br { display: none; }
  .footer-top { flex-direction: column; align-items: flex-start; }
  .download-modal-panel { padding: 24px; }
  .media-corner { display: none; }
}

@media (max-width: 420px) {
  .hero-specs strong { font-size: 17px; }
  .logo-copy strong { font-size: 17px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
}

@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; }
}