:root {
  --ink: #0a1628;
  --ink-soft: #132238;
  --fog: #d7e2ec;
  --cloud: #eef3f7;
  --mist: #b8c9d8;
  --sky: #3d6f8c;
  --teal: #0f6e6a;
  --teal-deep: #0a4f4c;
  --teal-glow: rgba(15, 110, 106, 0.14);
  --hint: #c43c3c;
  --hint-soft: rgba(196, 60, 60, 0.12);
  --text: #0e1a28;
  --text-secondary: #4a5d70;
  --text-muted: #7a8b9c;
  --line: rgba(10, 22, 40, 0.1);
  --line-strong: rgba(10, 22, 40, 0.16);
  --surface: rgba(255, 255, 255, 0.48);
  --surface-strong: rgba(255, 255, 255, 0.72);
  --radius: 4px;
  --radius-lg: 14px;
  --shadow-phone: 0 28px 56px rgba(10, 22, 40, 0.22), 0 8px 18px rgba(10, 22, 40, 0.12);
  --font-display: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Sora", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

body.lang-en {
  --font-display: "Newsreader", "Georgia", "Times New Roman", serif;
}

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

html {
  scroll-behavior: smooth;
}

html[data-lang="en"]:not([data-i18n-ready]) body {
  visibility: hidden;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(110% 70% at 8% -8%, #c8dceb 0%, transparent 52%),
    radial-gradient(80% 60% at 100% 4%, #9fbfd2 0%, transparent 48%),
    radial-gradient(70% 50% at 50% 100%, #c5d8e6 0%, transparent 55%),
    linear-gradient(180deg, var(--cloud) 0%, var(--fog) 42%, #e2ebf2 100%);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: rgba(15, 110, 106, 0.22);
  color: var(--ink);
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ——— Nav ——— */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(20px, 4vw, 48px);
  backdrop-filter: blur(16px) saturate(1.2);
  background: rgba(238, 243, 247, 0.68);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease),
    padding 0.3s var(--ease);
}

.nav.is-scrolled {
  padding-top: 12px;
  padding-bottom: 12px;
  border-bottom-color: var(--line);
  background: rgba(238, 243, 247, 0.9);
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.nav-brand img {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  box-shadow: 0 2px 8px rgba(10, 22, 40, 0.12);
}

.nav-links {
  display: flex;
  gap: 26px;
}

.nav-links a {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 1.5px;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-end {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.nav-cta {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--teal-deep);
  border-bottom: 1.5px solid currentColor;
  padding-bottom: 2px;
  white-space: nowrap;
  transition: color 0.2s var(--ease);
}

.nav-cta:hover {
  color: var(--ink);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.5);
}

.lang-btn {
  appearance: none;
  margin: 0;
  border: 0;
  padding: 5px 10px;
  border-radius: 999px;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.lang-btn:hover {
  color: var(--ink);
}

.lang-btn.is-active {
  background: var(--ink);
  color: #f4f8fb;
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
  }

  .nav-end {
    gap: 12px;
  }

  .lang-btn {
    padding: 5px 8px;
  }
}

/* ——— Buttons ——— */
.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: transform 0.2s var(--ease), background 0.2s, color 0.2s,
    border-color 0.2s, box-shadow 0.2s var(--ease);
}

.btn-primary {
  background: var(--ink);
  color: #f2f6f9;
  border: 1px solid var(--ink);
  box-shadow: 0 8px 20px rgba(10, 22, 40, 0.16);
}

.btn-primary:hover {
  background: var(--teal-deep);
  border-color: var(--teal-deep);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(10, 79, 76, 0.22);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.35);
  color: var(--ink);
  border: 1px solid rgba(10, 22, 40, 0.18);
}

.btn-ghost:hover {
  border-color: var(--ink);
  background: rgba(255, 255, 255, 0.55);
  transform: translateY(-2px);
}

/* ——— Hero ——— */
.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
  padding: clamp(100px, 14vh, 140px) clamp(20px, 4vw, 48px) 72px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.cloud {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.55;
  animation: drift 18s var(--ease) infinite alternate;
}

.cloud.c1 {
  width: 42vw;
  height: 28vw;
  top: 8%;
  left: -8%;
  background: #9ebfd4;
}

.cloud.c2 {
  width: 36vw;
  height: 24vw;
  top: 18%;
  right: -6%;
  background: #7fa9c0;
  animation-delay: -6s;
  animation-duration: 22s;
}

.cloud.c3 {
  width: 28vw;
  height: 20vw;
  bottom: 10%;
  left: 30%;
  background: #b5cddc;
  animation-delay: -3s;
  animation-duration: 16s;
}

.mist {
  position: absolute;
  inset: auto 0 0;
  height: 35%;
  background: linear-gradient(to top, rgba(238, 243, 247, 0.95), transparent);
}

@keyframes drift {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(3%, -2%) scale(1.06);
  }
}

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

.hero-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.brand-mark {
  margin: 0 0 10px;
  font-family: var(--font-body);
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--sky);
  line-height: 1.2;
}

.hero-tagline {
  margin: 0 0 28px;
  text-align: center;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: 0.04em;
  color: var(--ink);
  white-space: nowrap;
  text-wrap: balance;
}

.hero-brand {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-body);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--sky);
}

.hero-scenes {
  list-style: none;
  margin: 0;
  padding: 4px 0;
  max-width: 36em;
}

.hero-scenes li {
  position: relative;
  margin: 0;
  padding: 10px 0 10px 20px;
  border-bottom: 1px solid rgba(10, 22, 40, 0.08);
  color: var(--text-secondary);
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: 0.01em;
  opacity: 0.55;
  transform: scale(0.88);
  transform-origin: left center;
  transition: transform 0.5s var(--ease), opacity 0.5s var(--ease),
    color 0.5s var(--ease), font-weight 0.5s, font-size 0.5s var(--ease);
}

.hero-scenes li.is-active {
  color: var(--ink);
  font-size: clamp(1.08rem, 1.9vw, 1.22rem);
  font-weight: 600;
  opacity: 1;
  transform: scale(1);
}

.hero-scenes li:last-child {
  border-bottom: 0;
}

.hero-scenes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.15em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(196, 60, 60, 0.4);
  box-shadow: 0 0 0 0 rgba(196, 60, 60, 0);
  transition: background 0.5s var(--ease), box-shadow 0.5s var(--ease),
    transform 0.5s var(--ease);
}

.hero-scenes li.is-active::before {
  background: var(--hint);
  box-shadow: 0 0 0 6px rgba(196, 60, 60, 0.16);
  transform: scale(1.08);
}

.hero-lead,
.section-lead {
  margin: 0;
  max-width: 36em;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.75;
}

.hero-unlock {
  display: block;
  margin-top: 22px;
  max-width: 34em;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 500;
  line-height: 1.65;
  text-decoration: none;
  border-left: 3px solid var(--hint);
  padding: 10px 0 10px 14px;
  background: linear-gradient(90deg, var(--hint-soft), transparent 70%);
  transition: color 0.2s var(--ease);
}

.hero-unlock:hover {
  color: var(--teal-deep);
}

.hero-unlock-kicker {
  display: block;
  margin-bottom: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--hint);
}

.hero-search-mark {
  display: inline-block;
  margin: 0 2px;
  padding: 1px 8px;
  border-radius: 6px;
  background: var(--hint-soft);
  box-shadow: inset 0 0 0 1.5px rgba(196, 60, 60, 0.75);
  color: #a32f2f;
  font-weight: 700;
  font-style: normal;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
}

.btn-text {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 4px;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(74, 93, 112, 0.35);
  transition: color 0.2s var(--ease);
}

.btn-text:hover {
  color: var(--ink);
  text-decoration-color: var(--ink);
}

.shell-hint {
  margin: -6px 0 12px;
  font-size: 0.52rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--hint);
  text-align: right;
  animation: hint-fade 2.2s ease-in-out infinite;
}

@keyframes hint-fade {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.55;
  }
}

/* Phone mockups */
.phone-stack {
  position: relative;
  width: min(100%, 420px);
  height: 480px;
  margin-inline: auto;
}

.phone-stack::before {
  content: "";
  position: absolute;
  left: 12%;
  right: 8%;
  bottom: 18%;
  height: 40%;
  background: radial-gradient(ellipse at center, rgba(61, 111, 140, 0.28), transparent 70%);
  filter: blur(18px);
  pointer-events: none;
  z-index: 0;
}

.phone {
  position: absolute;
  width: 210px;
  height: 420px;
  padding: 12px;
  border-radius: 28px;
  background: linear-gradient(160deg, #243548, #0a1628 55%, #07101c);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-phone);
}

.phone-shell {
  left: 0;
  top: 24px;
  transform: rotate(-6deg);
  animation: float-a 7s ease-in-out infinite;
  z-index: 1;
}

.phone-chat {
  right: 0;
  top: 0;
  transform: rotate(5deg);
  animation: float-b 8s ease-in-out infinite;
  z-index: 2;
}

@keyframes float-a {
  0%,
  100% {
    transform: rotate(-6deg) translateY(0);
  }
  50% {
    transform: rotate(-6deg) translateY(-10px);
  }
}

@keyframes float-b {
  0%,
  100% {
    transform: rotate(5deg) translateY(0);
  }
  50% {
    transform: rotate(5deg) translateY(12px);
  }
}

.phone-notch {
  width: 72px;
  height: 8px;
  margin: 4px auto 10px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
}

.phone-screen {
  height: calc(100% - 48px);
  border-radius: 18px;
  overflow: hidden;
  padding: 14px 12px;
}

.shell-screen {
  background: linear-gradient(180deg, #f4f7fa, #e6edf3);
}

.chat-screen {
  background: linear-gradient(180deg, #101c2c, #0c1828);
}

.shell-bar,
.chat-bar {
  font-size: 0.72rem;
  font-weight: 600;
  margin-bottom: 14px;
  letter-spacing: 0.06em;
}

.shell-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 14px;
}

.shell-logo {
  font-family: var(--font-body);
  font-size: 0.58rem;
  font-weight: 600;
  color: #1a2b3c;
  letter-spacing: 0.01em;
  flex-shrink: 0;
}

.shell-search {
  flex: 1;
  max-width: 72%;
  padding: 5px 8px;
  border-radius: 12px;
  background: rgba(26, 43, 60, 0.06);
  border: 1px solid rgba(26, 43, 60, 0.08);
  font-size: 0.55rem;
  color: rgba(26, 43, 60, 0.4);
  text-align: left;
}

.shell-search.is-hint {
  box-shadow: 0 0 0 1.5px rgba(196, 60, 60, 0.85);
  animation: pulse-hint 2.2s ease-in-out infinite;
}

@keyframes pulse-hint {
  0%,
  100% {
    box-shadow: 0 0 0 1.5px rgba(196, 60, 60, 0.85);
  }
  50% {
    box-shadow: 0 0 0 3px rgba(196, 60, 60, 0.25);
  }
}

.shell-bar {
  color: #1a2b3c;
}

.chat-bar {
  color: #d7e4ef;
}

.shell-item {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.shell-item.muted {
  opacity: 0.45;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sky);
  flex-shrink: 0;
}

.line {
  height: 8px;
  border-radius: 4px;
  background: rgba(26, 43, 60, 0.12);
}

.line.w80 {
  width: 80%;
}
.line.w70 {
  width: 70%;
}
.line.w60 {
  width: 60%;
}
.line.w50 {
  width: 50%;
}

.shell-tabs {
  display: flex;
  justify-content: space-around;
  margin-top: auto;
  padding-top: 28px;
}

.shell-tabs span {
  width: 18px;
  height: 4px;
  border-radius: 2px;
  background: rgba(26, 43, 60, 0.2);
}

.bubble {
  max-width: 78%;
  padding: 8px 10px;
  margin-bottom: 8px;
  border-radius: 10px;
  font-size: 0.68rem;
  line-height: 1.4;
}

.bubble.in {
  background: rgba(184, 201, 216, 0.18);
  color: #d5e2ec;
  border-bottom-left-radius: 3px;
}

.bubble.out {
  margin-left: auto;
  background: rgba(15, 110, 106, 0.55);
  color: #e8f4f3;
  border-bottom-right-radius: 3px;
}

.chat-input {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 28px;
  height: 28px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.phone-chat .phone-screen {
  position: relative;
}

.phone-tag {
  position: absolute;
  left: 50%;
  bottom: -28px;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 110px;
    text-align: center;
  }

  .hero-lead {
    margin-inline: auto;
  }

  .hero-scenes {
    margin-inline: auto;
    text-align: left;
  }

  .hero-unlock {
    margin-inline: auto;
    text-align: left;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stage {
    margin-top: 12px;
  }

  .hero-tagline {
    margin-bottom: 20px;
    font-size: clamp(1.05rem, 4.2vw, 1.45rem);
    white-space: normal;
  }

  .hero-brand {
    letter-spacing: 0.1em;
  }

  .phone-stack {
    height: 400px;
    margin-top: 8px;
  }

  .phone {
    width: 180px;
    height: 360px;
  }
}

@media (max-width: 480px) {
  .phone-stack {
    width: 300px;
    height: 340px;
  }

  .phone {
    width: 150px;
    height: 300px;
  }

  .phone-tag {
    font-size: 0.68rem;
  }
}

/* ——— Sections ——— */
.section {
  position: relative;
  padding: clamp(80px, 13vh, 132px) clamp(20px, 4vw, 48px);
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}

.section h2 {
  margin: 0 0 18px;
  max-width: 16em;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.1vw, 2.35rem);
  font-weight: 500;
  line-height: 1.32;
  letter-spacing: 0.02em;
}

.where {
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(255, 255, 255, 0.38) 18%,
    rgba(255, 255, 255, 0.55) 100%
  );
}

.platforms {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.platforms-wrap {
  margin-top: clamp(48px, 8vh, 72px);
}

.platforms-title {
  margin: 0 0 14px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.platforms li {
  padding: 26px 22px 24px;
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.35), transparent);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.platforms li:hover {
  border-top-color: rgba(15, 110, 106, 0.35);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.55), transparent);
}

.platforms li.is-recommend {
  border-top-color: var(--teal);
  background: linear-gradient(180deg, var(--teal-glow), transparent 70%);
}

.platforms li.is-recommend strong::after {
  content: " 推荐";
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--teal);
}

body.lang-en .platforms li.is-recommend strong::after {
  content: " · Rec";
}

.platforms strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.12rem;
}

.platforms p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

@media (max-width: 720px) {
  .platforms {
    grid-template-columns: 1fr;
  }
}

.home-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  counter-reset: home;
}

.open-h5 {
  margin: 20px 0 0;
}

.home-steps li {
  position: relative;
  padding: 18px 0 18px 52px;
  border-top: 1px solid var(--line);
  counter-increment: home;
}

.home-steps li::before {
  content: counter(home, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 20px;
  font-family: var(--font-display);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.home-steps strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.02rem;
}

.home-steps p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.inline-link {
  color: var(--teal-deep);
  font-weight: 600;
  border-bottom: 1px solid currentColor;
  transition: color 0.2s var(--ease);
}

.inline-link:hover {
  color: var(--ink);
}

button.btn-ghost {
  cursor: pointer;
  font: inherit;
  background: transparent;
}

.home-shot {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.phone-home {
  position: relative;
  width: min(100%, 240px);
  height: 460px;
  margin-inline: auto;
  flex-shrink: 0;
}

.phone-screen.home-menu-screen {
  position: relative;
  height: calc(100% - 22px);
  padding: 0;
  overflow: hidden;
  background: #eef3f7;
  background: linear-gradient(180deg, #f4f7fa 0%, #e6edf3 100%);
}

.home-menu-bg {
  height: 100%;
  padding: 12px 12px 0;
  opacity: 0.4;
}

.home-menu-screen::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(10, 22, 40, 0.28);
  pointer-events: none;
}

.home-menu-sheet {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 10px 8px 14px;
  border-radius: 16px 16px 0 0;
  background: #fff;
  box-shadow: 0 -10px 32px rgba(10, 22, 40, 0.18);
}

.home-menu-handle {
  width: 36px;
  height: 4px;
  margin: 0 auto 10px;
  border-radius: 2px;
  background: rgba(26, 43, 60, 0.16);
}

.home-menu-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px 2px;
}

.home-menu-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 5px 2px 4px;
  border-radius: 8px;
  text-align: center;
  color: #2a3b4c;
  font-size: 0.5rem;
  line-height: 1.2;
  letter-spacing: 0;
}

body.lang-en .home-menu-item {
  font-size: 0.55rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.home-menu-ico {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: rgba(26, 43, 60, 0.06);
  color: #1a2b3c;
}

.home-menu-ico svg {
  width: 15px;
  height: 15px;
}

.home-menu-item.is-target {
  position: relative;
  box-shadow: 0 0 0 1.5px rgba(196, 60, 60, 0.9);
  animation: pulse-hint 2.2s ease-in-out infinite;
  color: #1a2b3c;
  font-weight: 600;
}

.home-menu-item.is-target .home-menu-ico {
  background: rgba(196, 60, 60, 0.1);
  color: #c43c3c;
}

.home-shot figcaption {
  margin-top: 16px;
  max-width: 240px;
  font-size: 0.88rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  text-align: center;
}

@media (max-width: 960px) {
  .phone-home {
    width: min(100%, 210px);
    height: 410px;
  }
}

.unlock {
  background:
    radial-gradient(70% 60% at 90% 20%, rgba(126, 196, 190, 0.12), transparent 55%),
    rgba(255, 255, 255, 0.28);
}

.unlock-tips {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.unlock-tips li {
  position: relative;
  padding: 14px 0 14px 18px;
  border-top: 1px solid var(--line);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

.unlock-tips li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.25em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
}

.unlock-tips strong {
  color: var(--ink);
  font-weight: 600;
}

.unlock-shot {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.phone-unlock {
  position: relative;
  width: min(100%, 240px);
  height: 460px;
  margin-inline: auto;
  flex-shrink: 0;
}

.phone-unlock .shell-screen {
  display: flex;
  flex-direction: column;
}

.phone-unlock .shell-tabs {
  margin-top: auto;
  padding-top: 20px;
}

.unlock-shot figcaption {
  margin-top: 16px;
  max-width: 260px;
  font-size: 0.88rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  text-align: center;
}

@media (max-width: 960px) {
  .phone-unlock {
    width: min(100%, 210px);
    height: 410px;
  }
}

/* Peek */
.peek {
  background:
    radial-gradient(80% 70% at 15% 10%, rgba(61, 111, 140, 0.35), transparent 50%),
    radial-gradient(70% 60% at 90% 80%, rgba(15, 110, 106, 0.22), transparent 45%),
    linear-gradient(165deg, #0c1828 0%, #0a1628 55%, #07121f 100%);
  color: #e8eef4;
}

.peek .eyebrow {
  color: #7ec4be;
}

.peek .section-lead {
  color: rgba(215, 226, 236, 0.72);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
}

.peek-visual {
  display: grid;
  gap: 14px;
}

.peek-card {
  padding: 22px 20px;
  border: 1px solid rgba(184, 201, 216, 0.14);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(8px);
}

.peek-card.locked {
  opacity: 0.85;
}

.peek-card.open {
  border-color: rgba(126, 196, 190, 0.4);
  background: rgba(15, 110, 106, 0.22);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
  animation: peek-in 0.8s var(--ease) both;
  animation-delay: 0.4s;
}

@keyframes peek-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.peek-meta {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: rgba(184, 201, 216, 0.55);
  margin-bottom: 10px;
}

.cipher {
  font-family: ui-monospace, monospace;
  letter-spacing: 0.12em;
  color: rgba(184, 201, 216, 0.4);
  filter: blur(2px);
}

.plain {
  font-size: 1.05rem;
  color: #e8f4f3;
}

.peek-hint,
.peek-reply {
  margin-top: 14px;
  font-size: 0.8rem;
  color: rgba(184, 201, 216, 0.45);
}

.peek-reply {
  color: #7ec4be;
}

@media (max-width: 800px) {
  .split {
    grid-template-columns: 1fr;
  }
}

/* Flow */
.flow {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.15) 0%,
    transparent 40%,
    rgba(255, 255, 255, 0.2) 100%
  );
}

.steps {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  counter-reset: none;
}

.steps li {
  padding: 22px 4px 8px;
  border-top: 2px solid var(--line);
  transition: border-color 0.25s var(--ease);
}

.steps li:hover {
  border-top-color: rgba(15, 110, 106, 0.45);
}

.step-num {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 0.92rem;
  letter-spacing: 0.14em;
  color: var(--teal);
}

.steps strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.12rem;
}

.steps p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

@media (max-width: 720px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

.why {
  background:
    radial-gradient(60% 50% at 0% 50%, rgba(158, 191, 212, 0.25), transparent 60%),
    rgba(255, 255, 255, 0.18);
}

/* FAQ */
.faq {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.18) 0%,
    rgba(255, 255, 255, 0.42) 100%
  );
}

.faq-list {
  margin-top: 36px;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.faq-item {
  border-top: 1px solid var(--line);
  padding: 0;
}

.faq-item:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 4px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.02em;
  transition: color 0.2s var(--ease);
}

.faq-item summary:hover {
  color: var(--teal-deep);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(15, 110, 106, 0.28);
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--teal);
  line-height: 1;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease),
    border-color 0.25s var(--ease);
}

.faq-item[open] summary::after {
  content: "–";
  background: var(--teal-glow);
  border-color: rgba(15, 110, 106, 0.45);
}

.faq-item p {
  margin: 0;
  padding: 0 4px 22px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item strong {
  color: var(--ink);
  font-weight: 600;
}

/* Get */
.get {
  padding-bottom: 100px;
}

.get-inner {
  position: relative;
  overflow: hidden;
  max-width: 680px;
  text-align: center;
  padding: clamp(52px, 9vw, 80px) clamp(24px, 4vw, 44px);
  background:
    radial-gradient(90% 80% at 50% -20%, rgba(126, 196, 190, 0.28), transparent 55%),
    linear-gradient(160deg, rgba(255, 255, 255, 0.72), rgba(190, 214, 228, 0.45));
  border: 1px solid var(--line-strong);
  box-shadow: 0 24px 60px rgba(10, 22, 40, 0.08);
}

.get-inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent 40%,
    rgba(255, 255, 255, 0.35) 50%,
    transparent 60%
  );
  pointer-events: none;
}

.get-inner .brand-mark {
  position: relative;
  font-size: clamp(2.1rem, 4.4vw, 3rem);
  color: var(--ink);
  letter-spacing: 0.04em;
}

.get-inner h2 {
  position: relative;
  max-width: none;
  margin-inline: auto;
}

.get-inner .section-lead {
  position: relative;
  margin-inline: auto;
}

.get-contact {
  position: relative;
  margin: 20px 0 0;
  font-size: 1.05rem;
  color: var(--ink);
  letter-spacing: 0.02em;
  line-height: 1.7;
}

.get-contact strong {
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.get-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

button.btn-primary {
  cursor: pointer;
  font: inherit;
}

/* Footer */
.footer {
  padding: 32px clamp(20px, 4vw, 48px) 44px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.22);
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-brand {
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  align-items: center;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s var(--ease);
}

.footer-links a:hover {
  color: var(--teal-deep);
}

/* Subpages */
.page-main {
  padding-top: 72px;
}

.page-narrow {
  max-width: 720px;
}

.page-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
}

.page-note {
  margin: 16px 0 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.invite-id {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 28px 0 8px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
}

.invite-id-label {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}

.invite-id strong {
  font-family: var(--font-body);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: 0.18em;
  color: var(--ink);
}

.invite-how {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.invite-how h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--ink);
}

.launch-steps {
  text-align: left;
  margin: 24px auto 0;
  max-width: 28em;
}

.blog-list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.blog-list a {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: color 0.2s var(--ease);
}

.blog-list li:last-child a {
  border-bottom: 1px solid var(--line);
}

.blog-list a:hover strong {
  color: var(--teal-deep);
}

.blog-list strong {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ink);
}

.blog-list span {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.blog-list em {
  font-style: normal;
  font-size: 0.85rem;
  color: var(--teal);
  letter-spacing: 0.04em;
}

.article h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  line-height: 1.28;
  color: var(--ink-soft);
}

.article h2 {
  margin: 32px 0 12px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
}

.article p,
.article li {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
}

.article ol {
  padding-left: 1.2em;
}

.article-lead {
  font-size: 1.1rem !important;
  color: var(--text) !important;
}

.article-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

body.lang-en .only-zh,
body.lang-zh .only-en {
  display: none !important;
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 {
  transition-delay: 0.1s;
}
.delay-2 {
  transition-delay: 0.2s;
}
.delay-3 {
  transition-delay: 0.32s;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .cloud,
  .phone-shell,
  .phone-chat,
  .peek-card.open,
  .shell-search.is-hint,
  .shell-hint,
  .home-menu-item.is-target {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}