/* ============================================================
   SoloDoppel 独播 — 官网样式
   配色与圆角取自桌面端 apps/desktop/src/styles.css
   ============================================================ */

[hidden] { display: none !important; }

:root {
  color-scheme: dark;

  /* 底色 */
  --bg: #0b0c0c;
  --bg-alt: #0f1011;
  --panel: #131415;
  --panel-2: #1b1d1f;
  --panel-3: #292c2e;

  /* 线条 */
  --line: #26292b;
  --line-soft: #1c1f21;

  /* 文字 */
  --text: #c8cdd0;
  --text-strong: #ecf1f5;
  --muted: #858b91;
  --dim: #5d6368;

  /* 主题色（与应用一致） */
  --mint: #c3efff;
  --lime: #b8cf88;
  --orange: #fccd81;
  --danger: #ff7a86;

  /* 圆角 */
  --r-xl: 26px;
  --r-lg: 18px;
  --r-md: 12px;
  --r-sm: 8px;

  --wrap: 1200px;
  --head-h: 68px;

  --font-cn:
    "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB",
    system-ui, sans-serif;
  --font-en:
    "Inter", "SF Pro Display", "Segoe UI", "Helvetica Neue", Arial,
    var(--font-cn);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--head-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--text-strong);
  line-height: 1.25;
  font-weight: 800;
}
p {
  margin: 0;
}
ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
svg {
  display: block;
}
b,
strong {
  font-weight: 800;
  color: var(--text-strong);
}

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

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
}

.only-mobile {
  display: none;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 800;
  white-space: nowrap;
  cursor: pointer;
  transition:
    background 0.16s ease,
    color 0.16s ease,
    border-color 0.16s ease,
    transform 0.16s ease,
    box-shadow 0.16s ease;
}
.btn svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}
.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--mint);
  color: #10191c;
  box-shadow: 0 8px 26px rgba(195, 239, 255, 0.12);
}
.btn-primary:hover {
  background: #d6f4ff;
  box-shadow: 0 10px 32px rgba(195, 239, 255, 0.2);
}

.btn-outline {
  background: transparent;
  border-color: #3a3f43;
  color: var(--text-strong);
}
.btn-outline:hover {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(184, 207, 136, 0.06);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.045);
  border-color: var(--line);
  color: var(--text-strong);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.085);
  border-color: #3a3f43;
}

.btn-sm {
  height: 38px;
  padding: 0 18px;
  font-size: 14px;
}
.btn-lg {
  height: 54px;
  padding: 0 30px;
  font-size: 17px;
  border-radius: 999px;
}
.btn-block {
  width: 100%;
}

/* ============ 顶栏 ============ */
.site-head {
  position: sticky;
  top: 0;
  z-index: 90;
  border-bottom: 1px solid transparent;
  background: rgba(11, 12, 12, 0.72);
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  transition:
    border-color 0.2s ease,
    background 0.2s ease;
}
.site-head.scrolled {
  border-bottom-color: var(--line-soft);
  background: rgba(11, 12, 12, 0.9);
}

.head-inner {
  display: flex;
  align-items: center;
  gap: 26px;
  height: var(--head-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}
.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}
.brand-name {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-en);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.4px;
  color: var(--text-strong);
}
.brand-name em {
  font-family: var(--font-cn);
  font-style: normal;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--muted);
}

.head-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
  font-size: 15px;
  font-weight: 700;
  color: var(--muted);
}
.head-nav a {
  transition: color 0.16s ease;
}
.head-nav a:hover {
  color: var(--text-strong);
}

.head-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ============ 通用段落 ============ */
.section {
  padding: 108px 0;
}
.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--line-soft);
}

.sec-head {
  max-width: 760px;
  margin: 0 auto 54px;
  text-align: center;
}
.sec-head h2 {
  margin: 12px 0 16px;
  font-size: clamp(30px, 4vw, 46px);
  letter-spacing: -0.8px;
}
.sec-sub {
  color: var(--muted);
  font-size: 17px;
}
.sec-sub b {
  color: var(--text-strong);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1.6px;
  color: var(--lime);
  text-transform: uppercase;
}
.eyebrow .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 207, 136, 0.16);
}

/* ============ 首屏 ============ */
.hero {
  position: relative;
  padding: 86px 0 96px;
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -320px;
  left: 50%;
  width: 1100px;
  height: 720px;
  transform: translateX(-50%);
  background: radial-gradient(
    closest-side,
    rgba(195, 239, 255, 0.13),
    rgba(195, 239, 255, 0) 72%
  );
  pointer-events: none;
}
.hero > .wrap {
  position: relative;
}

.hero-title {
  margin: 20px 0 22px;
  font-size: clamp(38px, 6.4vw, 76px);
  font-weight: 900;
  letter-spacing: -2px;
  line-height: 1.1;
}

.hero-sub {
  max-width: 720px;
  margin: 0 auto;
  color: var(--muted);
  font-size: clamp(15px, 1.5vw, 18px);
}

.hero-cta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-hint {
  margin-top: 16px;
  color: var(--dim);
  font-size: 13.5px;
}
.hero-hint b {
  color: var(--mint);
  font-weight: 800;
}

/* 下载面板（已上移到首屏提示下方） */
.hero-download {
  padding-top: 44px;
}

/* 首屏产品图 / 示意窗口 */
.hero-shot {
  position: relative;
  max-width: 1080px;
  margin: 62px auto 0;
  border: 1px solid #232628;
  border-radius: var(--r-xl);
  background: #0d0e0e;
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.55);
  overflow: hidden;
}
.hero-shot img {
  width: 100%;
}

.mock {
  text-align: left;
  user-select: none;
}
.mock-bar {
  display: flex;
  align-items: center;
  gap: 22px;
  height: 54px;
  padding: 0 18px;
  border-bottom: 1px solid var(--line);
  background: #101111;
}
.mock-brand {
  display: flex;
  align-items: center;
  gap: 8px;
}
.mock-brand img {
  width: 20px;
  height: 20px;
  border-radius: 6px;
}
.mock-brand b {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: -0.2px;
}
.mock-nav {
  display: flex;
  gap: 16px;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--dim);
}
.mock-nav .on {
  color: var(--text-strong);
}
.mock-steps {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-left: auto;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--dim);
}
.mock-steps i {
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #33383b;
  color: #8f979b;
  font-style: normal;
  font-size: 10px;
}
.mock-steps i.done {
  background: var(--lime);
  color: #161a14;
}
.mock-steps em {
  font-style: normal;
  margin-right: 6px;
}
.mock-dots {
  display: flex;
  gap: 7px;
}
.mock-dots s {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #2c3033;
}

.mock-body {
  display: grid;
  grid-template-columns: 1fr 1.5fr 1fr;
  gap: 12px;
  padding: 14px;
}
.mock-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.mock-card {
  padding: 13px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: #151718;
}
.mock-card.tall {
  min-height: 268px;
}
.mock-card b {
  display: block;
  margin-bottom: 11px;
  font-size: 12px;
  color: #9aa1a6;
}
.mock-card p {
  height: 8px;
  margin-bottom: 9px;
  border-radius: 4px;
  background: #22262a;
}
.mock-card p.w90 {
  width: 90%;
}
.mock-card p.w75 {
  width: 75%;
}
.mock-card p.w70 {
  width: 70%;
}
.mock-card p.w60 {
  width: 60%;
}
.mock-card p.w45 {
  width: 45%;
}
.mock-card p.w40 {
  width: 40%;
}

.mock-card .chip {
  display: inline-block;
  margin: 0 5px 5px 0;
  padding: 3px 10px;
  border: 1px solid #2c3033;
  border-radius: 999px;
  font-size: 11px;
  color: var(--dim);
}
.mock-card .chip.on {
  border-color: var(--lime);
  color: var(--lime);
}

.mock-card .voice {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 11.5px;
  color: #9aa1a6;
}
.mock-card .voice i {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--mint), #6f8f9c);
}

.mock-wave {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 46px;
  margin-top: 16px;
}
.mock-wave s {
  flex: 1;
  border-radius: 2px;
  background: var(--lime);
  opacity: 0.55;
}
.mock-wave s:nth-child(3n) {
  height: 92%;
  opacity: 0.85;
}
.mock-wave s:nth-child(3n + 1) {
  height: 46%;
}
.mock-wave s:nth-child(3n + 2) {
  height: 70%;
}
.mock-wave s:nth-child(5n) {
  height: 30%;
}

.mock-go {
  margin-top: 12px;
  padding: 11px 0;
  border-radius: var(--r-sm);
  background: var(--lime);
  color: #161a14;
  font-size: 14px;
  font-weight: 900;
  text-align: center;
}

/* 四步流程 */
.flow {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 44px;
}
.flow li {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 18px 9px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.022);
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}
.flow b {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--panel-3);
  color: var(--lime);
  font-size: 12px;
}

/* ============ 下载 ============ */
.os-switch {
  display: flex;
  justify-content: center;
  gap: 6px;
  width: fit-content;
  margin: -22px auto 40px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
}
.os-switch button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 20px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  transition:
    background 0.16s ease,
    color 0.16s ease;
}
.os-switch button svg {
  width: 16px;
  height: 16px;
}
.os-switch button:hover {
  color: var(--text-strong);
}
.os-switch button.on {
  background: var(--panel-3);
  color: var(--text-strong);
}

.os-switch + .hero-hint {
  margin-top: 12px;
}

.os-switch:has(+ .hero-hint) {
  margin-bottom: 0;
}

.hero-hint + .dl-grid {
  margin-top: 30px;
}

.dl-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  max-width: 940px;
  margin: 0 auto;
}

.dl-card {
  display: flex;
  flex-direction: column;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: var(--panel);
  transition:
    border-color 0.18s ease,
    transform 0.18s ease,
    box-shadow 0.18s ease;
}
.dl-card:hover {
  transform: translateY(-3px);
  border-color: #383d40;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
}
.dl-card.featured {
  border-color: rgba(195, 239, 255, 0.3);
  background:
    radial-gradient(
      120% 140% at 50% -30%,
      rgba(195, 239, 255, 0.09),
      transparent 62%
    ),
    var(--panel);
}
.dl-card[hidden] {
  display: none;
}

.dl-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.dl-os {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 800;
  color: var(--muted);
}
.dl-os svg {
  width: 18px;
  height: 18px;
}

.tag {
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-2);
  font-size: 12px;
  font-weight: 800;
  color: var(--muted);
}
.tag-mint {
  border-color: rgba(195, 239, 255, 0.38);
  background: rgba(195, 239, 255, 0.1);
  color: var(--mint);
}

.dl-card h3 {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 27px;
  letter-spacing: -0.6px;
}
.dl-card h3 small {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--dim);
}

.dl-desc {
  margin: 14px 0 22px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.8;
}

.dl-spec {
  margin-bottom: 26px;
  border-top: 1px solid var(--line-soft);
}
.dl-spec li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
}
.dl-spec span {
  color: var(--dim);
}
.dl-spec b {
  font-weight: 800;
  text-align: right;
}
.dl-spec b.ok {
  color: var(--lime);
}

.dl-card .btn-block {
  margin-top: auto;
}

.dl-meta {
  margin-top: 12px;
  color: var(--dim);
  font-size: 12.5px;
  text-align: center;
}

.dl-foot {
  max-width: 720px;
  margin: 36px auto 0;
  color: var(--muted);
  font-size: 14.5px;
  text-align: center;
}

/* ============ 视频 ============ */
.video-box {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: #0a0b0b;
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}
.demo-video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  background: #0a0b0b;
}

.video-play {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  width: 100%;
  border: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 11, 11, 0.35),
    rgba(10, 11, 11, 0.72)
  );
  color: var(--text-strong);
  font-family: inherit;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition:
    opacity 0.25s ease,
    background 0.25s ease;
}
.video-play svg {
  width: 30px;
  height: 30px;
  padding: 24px;
  box-sizing: content-box;
  border-radius: 50%;
  background: var(--mint);
  color: #10191c;
  box-shadow: 0 12px 40px rgba(195, 239, 255, 0.28);
  transition: transform 0.2s ease;
}
.video-play:hover svg {
  transform: scale(1.06);
}
.video-play[hidden] {
  display: none;
}

/* ============ 教程 ============ */
.steps {
  display: flex;
  flex-direction: column;
  gap: 26px;
  max-width: 1060px;
  margin: 0 auto;
}

.step {
  display: grid;
  grid-template-columns: 1fr 1.08fr;
  align-items: center;
  gap: 44px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: var(--panel);
}
.step:nth-child(even) .step-text {
  order: 2;
}

.step-no {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 13px;
  border-radius: 999px;
  background: var(--panel-3);
  color: var(--lime);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.step-text h3 {
  margin-bottom: 14px;
  font-size: clamp(21px, 2.3vw, 27px);
  letter-spacing: -0.5px;
}
.step-text p {
  color: var(--muted);
  font-size: 15px;
}
.step-text p + p {
  margin-top: 12px;
}
.step-text b {
  color: var(--text-strong);
}

.step-note {
  padding: 12px 16px;
  border-left: 2px solid var(--orange);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(252, 205, 129, 0.06);
  font-size: 13.5px !important;
  color: #a89676 !important;
}

.step-shot {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background: var(--bg-alt);
  overflow: hidden;
}
.step-shot img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: repeating-linear-gradient(
    45deg,
    #141617 0 12px,
    #17191a 12px 24px
  );
}
.step-shot figcaption {
  padding: 11px 16px;
  border-top: 1px solid var(--line-soft);
  color: var(--dim);
  font-size: 12.5px;
  text-align: center;
}

.guide-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  max-width: 1060px;
  margin: 34px auto 0;
  padding: 26px 34px;
  border: 1px dashed var(--line);
  border-radius: var(--r-xl);
}
.guide-cta p {
  color: var(--muted);
  font-size: 15px;
}

/* ============ 页脚 ============ */
.site-foot {
  padding-top: 84px;
  border-top: 1px solid var(--line-soft);
  background: var(--bg-alt);
  overflow: hidden;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.7fr repeat(3, 0.85fr) 1.25fr;
  gap: 36px;
  padding-bottom: 54px;
}

.foot-brand p {
  margin-top: 16px;
  color: var(--dim);
  font-size: 14px;
  line-height: 1.85;
}

.foot-col h4 {
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1.2px;
  color: var(--text-strong);
}
.foot-col a,
.foot-col p {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 14px;
  transition: color 0.16s ease;
}
.foot-col a:hover {
  color: var(--mint);
}

.foot-contact p {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}
.foot-contact span {
  flex: 0 0 68px;
  color: var(--dim);
  font-size: 13px;
}
.foot-contact b,
.foot-contact a {
  margin: 0;
  font-size: 14.5px;
  font-weight: 800;
  color: var(--text-strong);
  font-family: var(--font-en);
}

.foot-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
  color: var(--dim);
  font-size: 13px;
}
.foot-bar a {
  color: var(--dim);
}
.foot-bar a:hover {
  color: var(--muted);
}

.beian {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  justify-content: center;
}

/* 最底部巨型字标 */
.wordmark {
  padding: 26px 0 0;
  font-family: var(--font-en);
  font-size: clamp(58px, 15.6vw, 250px);
  font-weight: 900;
  letter-spacing: -0.045em;
  line-height: 0.92;
  text-align: center;
  white-space: nowrap;
  color: transparent;
  background: linear-gradient(180deg, #1e2224 0%, #131516 58%, #0f1011 100%);
  -webkit-background-clip: text;
  background-clip: text;
  user-select: none;
  transform: translateY(14%);
}

/* ============ 内容页（协议 / 隐私） ============ */
.doc {
  max-width: 800px;
  margin: 0 auto;
  padding: 76px 28px 96px;
}
.doc h1 {
  margin-bottom: 10px;
  font-size: clamp(30px, 4vw, 42px);
  letter-spacing: -1px;
}
.doc .doc-meta {
  margin-bottom: 44px;
  color: var(--dim);
  font-size: 14px;
}
.doc h2 {
  margin: 44px 0 14px;
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
  font-size: 20px;
}
.doc p {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 15.5px;
}
.doc ul {
  margin: 0 0 14px;
  padding-left: 4px;
}
.doc li {
  position: relative;
  margin-bottom: 10px;
  padding-left: 20px;
  color: var(--muted);
  font-size: 15.5px;
}
.doc li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 13px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
}
.doc a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.doc-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}
.doc-back:hover {
  color: var(--mint);
}

/* ============ 入场动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.6s cubic-bezier(0.2, 0.7, 0.3, 1),
    transform 0.6s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  * {
    animation: none !important;
  }
}

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .foot-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .foot-brand {
    grid-column: 1 / -1;
  }
  .foot-contact {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .section {
    padding: 76px 0;
  }
  .hero {
    padding: 60px 0 72px;
  }
  .hero-shot {
    margin-top: 44px;
  }
  .mock-steps,
  .mock-dots {
    display: none;
  }
  .mock-body {
    grid-template-columns: 1fr;
  }
  .mock-card.tall {
    min-height: 180px;
  }
  .dl-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
  }
  .step {
    grid-template-columns: 1fr;
    gap: 26px;
    padding: 26px;
  }
  .step:nth-child(even) .step-text {
    order: 0;
  }
  .guide-cta {
    flex-direction: column;
    text-align: center;
    padding: 24px;
  }
}

@media (max-width: 760px) {
  .head-inner {
    height: auto;
    min-height: var(--head-h);
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 12px;
    padding-bottom: 12px;
  }
  .head-actions {
    margin-left: auto;
    flex-shrink: 0;
  }
  .head-nav {
    order: 3;
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }
  .head-nav a {
    white-space: nowrap;
  }
}

@media (max-width: 600px) {
  .wrap {
    padding: 0 20px;
  }
  .only-mobile {
    display: inline;
  }
  .brand-name em {
    display: none;
  }
  .head-inner {
    gap: 12px;
    padding-top: 12px;
    padding-bottom: 12px;
  }
  .site-head .brand {
    gap: 8px;
  }
  .site-head .brand-name {
    font-size: 18px;
  }
  .site-head .brand img {
    width: 30px;
    height: 30px;
  }
  .head-actions .btn {
    padding-inline: 12px;
    font-size: 13px;
  }
  .head-nav {
    gap: 16px;
    font-size: 14px;
  }
  .hero-cta .btn {
    width: 100%;
  }
  .flow {
    gap: 8px;
  }
  .flow li {
    font-size: 13px;
    padding: 7px 14px 7px 8px;
  }
  .os-switch {
    width: 100%;
  }
  .os-switch button {
    flex: 1;
    padding: 0;
  }
  .dl-card {
    padding: 22px;
  }
  .foot-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  .foot-bar {
    justify-content: center;
    text-align: center;
  }
  .wordmark {
    transform: translateY(10%);
  }
}
/* Unpublished releases stay visible without dead download links. */
.btn[aria-disabled="true"], .video-play:disabled {
  opacity: .65;
  cursor: default;
  pointer-events: none;
}