:root {
  color-scheme: dark;
  --ink: #f8f3e8;
  --muted: #bcb5aa;
  --black: #090909;
  --soft-black: #11110f;
  --warm: #f1e8da;
  --orange: #ff6818;
  --gold: #f2bd50;
  --line: rgba(255, 255, 255, 0.13);
  --card: rgba(19, 19, 17, 0.9);
  --radius: 34px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--black);
  color: var(--ink);
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  content: "";
  background:
    radial-gradient(circle at 78% 18%, rgba(255, 102, 24, 0.08), transparent 30%),
    radial-gradient(circle at 18% 68%, rgba(44, 174, 224, 0.06), transparent 30%),
    #090909;
}

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

button,
input,
textarea {
  font: inherit;
}

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

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 12px 18px;
  border-radius: 20px;
  background: var(--ink);
  color: var(--black);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: 100%;
  min-height: 78px;
  padding: 0 4vw;
  border-bottom: 1px solid transparent;
  background: linear-gradient(180deg, rgba(9, 9, 9, 0.86), rgba(9, 9, 9, 0));
  transition: 180ms ease;
}

.site-header.scrolled {
  border-color: var(--line);
  background: rgba(9, 9, 9, 0.87);
  backdrop-filter: blur(22px);
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  letter-spacing: 0.16em;
  font-weight: 800;
}

.brand-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 24px rgba(255, 104, 24, 0.7);
}

.site-nav {
  display: flex;
  gap: 30px;
  font-size: 14px;
  color: #d0c9be;
}

.site-nav a,
.header-download {
  transition: color 160ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.header-download {
  justify-self: end;
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
}

.header-download:hover {
  color: var(--black);
  background: var(--ink);
}

.menu-button {
  display: none;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.84fr);
  align-items: center;
  min-height: 100svh;
  overflow: hidden;
  padding: 132px max(5vw, 56px) 72px;
}

.hero-stage {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.66) 0%, rgba(0, 0, 0, 0.2) 50%, rgba(0, 0, 0, 0.04)),
    linear-gradient(180deg, rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0.2)),
    url("/assets/backgrounds/stage-hero.png") center / cover;
  filter: saturate(0.86);
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 900px;
}

.eyebrow {
  margin: 0 0 24px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 880px;
  margin-bottom: 36px;
  font-size: clamp(54px, 6.4vw, 108px);
  line-height: 1.06;
  letter-spacing: -0.055em;
}

.hero-lead {
  margin-bottom: 34px;
  color: #d4cdc2;
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.72;
}

.hero-actions,
.download-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  padding: 0 25px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  transition:
    transform 160ms ease,
    background 160ms ease,
    color 160ms ease,
    border-color 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button:focus-visible,
.site-nav a:focus-visible,
.header-download:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(242, 189, 80, 0.6);
  outline-offset: 4px;
}

.button-primary {
  background: var(--orange);
  color: white;
}

.button-primary:hover {
  background: #ff7a33;
}

.button-ghost {
  border-color: rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.04);
}

.button-ghost:hover {
  border-color: rgba(255, 255, 255, 0.48);
  background: rgba(255, 255, 255, 0.1);
}

.button-ghost.light {
  color: var(--black);
  border-color: rgba(0, 0, 0, 0.18);
  background: rgba(255, 255, 255, 0.4);
}

.hero-note {
  margin-top: 22px;
  color: #918a81;
  font-size: 13px;
}

.hero-visual {
  position: relative;
  align-self: stretch;
  min-height: 660px;
}

.hero-animation,
.hero-fallback {
  position: absolute;
  right: -2vw;
  bottom: -6vh;
  z-index: 2;
  width: min(48vw, 560px);
  height: auto;
  max-width: none;
  filter: drop-shadow(0 35px 55px rgba(0, 0, 0, 0.4));
}

.hero-fallback {
  display: none;
}

.hero-orbit {
  position: absolute;
  top: 6%;
  right: -6%;
  width: 760px;
  height: 760px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  box-shadow:
    0 0 90px rgba(255, 104, 24, 0.12),
    inset 0 0 90px rgba(255, 255, 255, 0.03);
}

.hero-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: fit-content;
  margin-top: 18px;
  padding: 12px 17px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  background: rgba(8, 8, 8, 0.72);
  color: #dcd5ca;
  font-size: 13px;
  backdrop-filter: blur(16px);
}

.status-pulse {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #50d57d;
  box-shadow: 0 0 0 6px rgba(80, 213, 125, 0.12);
}

.intro,
.day-section,
.xiaohongshu-section,
.comments-section,
.faq-section {
  padding: 120px max(5vw, 56px);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(300px, 0.95fr) minmax(420px, 1.05fr);
  column-gap: 9vw;
  max-width: 1380px;
  margin: 0 auto 68px;
}

.section-heading .eyebrow {
  grid-column: 1 / -1;
}

.section-heading h2,
.download-copy h2,
.comments-intro h2 {
  margin-bottom: 0;
  font-size: clamp(42px, 5vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.section-heading > p:last-child {
  align-self: end;
  max-width: 670px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.9;
}

.section-heading.centered {
  display: block;
  max-width: 800px;
  text-align: center;
}

.section-heading.centered > p:last-child {
  margin: 24px auto 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  max-width: 1480px;
  margin: 0 auto;
}

.feature-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(31, 31, 28, 0.94), rgba(13, 13, 12, 0.98));
}

.feature-card-wide {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
}

.feature-card-reverse .feature-media {
  order: 2;
}

.feature-media {
  position: relative;
  min-height: 420px;
  overflow: hidden;
  background: #0b0b0a;
}

.feature-media::after {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.feature-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-copy {
  padding: 44px;
}

.feature-index {
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.feature-copy h3 {
  margin: 18px 0 18px;
  font-size: clamp(30px, 3vw, 48px);
  letter-spacing: -0.04em;
}

.feature-copy p,
.feature-copy li {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.feature-copy ul {
  margin: 24px 0 0;
  padding-left: 20px;
}

.fine-print {
  font-size: 13px !important;
}

.day-section {
  background: var(--warm);
  color: #171614;
}

.day-section .eyebrow {
  color: #a55a16;
}

.day-section .section-heading > p:last-child {
  color: #6e675f;
}

.day-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  max-width: 1480px;
  margin: auto;
}

.day-card {
  overflow: hidden;
  border-radius: 30px;
  background: #fffaf1;
  box-shadow: 0 18px 70px rgba(65, 52, 36, 0.11);
}

.day-card img {
  width: 100%;
  aspect-ratio: 4 / 4.9;
  object-fit: cover;
}

.day-card > div {
  padding: 30px 30px 34px;
}

.day-card span {
  color: #a55a16;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.day-card h3 {
  margin: 12px 0 10px;
  font-size: 28px;
}

.day-card p {
  margin: 0;
  color: #6e675f;
  line-height: 1.75;
}

.download-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.8fr);
  gap: 8vw;
  align-items: center;
  min-height: 820px;
  padding: 120px max(5vw, 56px);
  background:
    linear-gradient(90deg, rgba(255, 104, 24, 0.9), rgba(255, 131, 55, 0.8)),
    url("/assets/promo/bubu-stage-no-text-1920x1080.jpg") center / cover;
  color: #17110d;
}

.download-copy {
  max-width: 720px;
}

.download-copy .eyebrow {
  color: #3b1b0b;
}

.download-copy > p:not(.eyebrow) {
  max-width: 650px;
  margin: 30px 0;
  font-size: 18px;
  line-height: 1.85;
}

.download-section .button-primary {
  color: white;
  background: #11100f;
}

.release-meta {
  display: flex;
  gap: 48px;
  margin: 48px 0 0;
}

.release-meta div {
  display: grid;
  gap: 6px;
}

.release-meta dt {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.release-meta dd {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.install-card {
  padding: 42px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 36px;
  background: rgba(255, 248, 238, 0.86);
  box-shadow: 0 25px 80px rgba(63, 27, 8, 0.22);
  backdrop-filter: blur(18px);
}

.card-kicker {
  margin-bottom: 28px;
  font-weight: 800;
}

.install-card ol {
  display: grid;
  gap: 25px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.install-card li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 15px;
}

.install-card li > span {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: white;
  background: #17110d;
  font-size: 12px;
  font-weight: 800;
}

.install-card strong {
  font-size: 18px;
}

.install-card li p,
.install-tip {
  margin: 8px 0 0;
  color: #645448;
  line-height: 1.65;
}

.install-tip {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid rgba(23, 17, 13, 0.14);
  font-size: 13px;
}

.xiaohongshu-section {
  overflow: hidden;
  background:
    radial-gradient(circle at 85% 15%, rgba(255, 104, 24, 0.14), transparent 28%),
    radial-gradient(circle at 10% 78%, rgba(242, 189, 80, 0.08), transparent 30%),
    #0c0c0b;
}

.xiaohongshu-showcase {
  max-width: 1100px;
  margin: 0 auto;
}

.xiaohongshu-profile {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.36fr);
  align-content: space-between;
  align-items: center;
  gap: 36px;
  padding: 46px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 30px;
  background:
    linear-gradient(160deg, rgba(255, 104, 24, 0.18), transparent 48%),
    rgba(24, 24, 21, 0.92);
}

.profile-label {
  margin-bottom: 16px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.xiaohongshu-profile h3 {
  margin-bottom: 10px;
  font-size: clamp(28px, 3vw, 42px);
  letter-spacing: -0.04em;
}

.profile-id {
  color: #e0d9ce !important;
  font-size: 14px !important;
  font-weight: 700;
}

.xiaohongshu-profile p:not(.profile-label) {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.profile-qr {
  display: grid;
  justify-items: center;
  gap: 13px;
  padding: 18px;
  border-radius: 24px;
  background: var(--warm);
  color: #2a241e;
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  transition: transform 160ms ease;
}

.profile-qr:hover {
  transform: translateY(-3px);
}

.profile-qr img {
  width: min(100%, 230px);
  height: auto;
  aspect-ratio: 1;
  object-fit: contain;
  border-radius: 12px;
}

.comments-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(440px, 1.15fr);
  gap: 8vw;
  max-width: 1600px;
  margin: auto;
}

.comments-intro > p:not(.eyebrow) {
  margin: 26px 0 36px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.comment-form {
  display: grid;
  gap: 18px;
}

.comment-form label {
  display: grid;
  gap: 9px;
}

.comment-form label > span {
  color: #d7d0c6;
  font-size: 13px;
  font-weight: 700;
}

.comment-form input,
.comment-form textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 18px;
  outline: none;
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
}

.comment-form input {
  height: 54px;
  padding: 0 17px;
}

.comment-form textarea {
  min-height: 142px;
  padding: 16px 17px;
  resize: vertical;
}

.comment-form input:focus,
.comment-form textarea:focus {
  border-color: rgba(242, 189, 80, 0.7);
  box-shadow: 0 0 0 4px rgba(242, 189, 80, 0.1);
}

.honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.form-footer > span,
.form-message {
  color: #8f887f;
  font-size: 13px;
}

.form-message {
  min-height: 20px;
  margin: 0;
}

.comment-wall {
  min-height: 610px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent),
    rgba(16, 16, 14, 0.8);
}

.comment-wall-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.comment-wall-head h3 {
  margin: 0;
  font-size: 28px;
}

.comment-wall-head span {
  color: #888178;
  font-size: 12px;
}

.comments-list {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.comment-item,
.comment-placeholder {
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.035);
}

.comment-item p {
  margin: 0 0 16px;
  color: #e5ded3;
  line-height: 1.78;
}

.comment-meta {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  color: #8f887f;
  font-size: 12px;
}

.comment-meta strong {
  color: var(--gold);
}

.comment-placeholder {
  color: #858077;
  text-align: center;
}

.faq-section {
  display: grid;
  grid-template-columns: minmax(300px, 0.75fr) minmax(500px, 1.25fr);
  gap: 8vw;
  max-width: 1600px;
  margin: auto;
}

.faq-section .section-heading {
  display: block;
  margin: 0;
}

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

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 0;
  cursor: pointer;
  font-size: 19px;
  font-weight: 700;
  list-style: none;
}

.faq-list summary::after {
  content: "＋";
  color: var(--gold);
  font-size: 25px;
  font-weight: 400;
}

.faq-list details[open] summary::after {
  content: "−";
}

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

.faq-list details p {
  max-width: 760px;
  padding: 0 42px 28px 0;
  color: var(--muted);
  line-height: 1.85;
}

footer {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1.3fr auto;
  gap: 40px;
  align-items: start;
  padding: 48px max(5vw, 56px);
  border-top: 1px solid var(--line);
  color: #827c73;
  font-size: 12px;
  line-height: 1.7;
}

footer p {
  margin: 0;
}

.footer-brand {
  color: var(--ink);
  font-size: 12px;
}

.footer-legal {
  max-width: 580px;
}

@media (max-width: 1100px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    right: 4vw;
    display: none;
    flex-direction: column;
    width: min(320px, 92vw);
    gap: 0;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: rgba(11, 11, 10, 0.97);
    box-shadow: 0 22px 60px rgba(0, 0, 0, 0.4);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 14px 12px;
  }

  .header-download {
    display: none;
  }

  .menu-button {
    display: block;
    padding: 10px 16px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.04);
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 160px;
  }

  .hero-copy {
    max-width: 850px;
  }

  .hero-visual {
    min-height: 690px;
  }

  .hero-animation,
  .hero-fallback {
    right: 50%;
    bottom: -80px;
    width: min(78vw, 560px);
    transform: translateX(50%);
  }

  .hero-orbit {
    top: 5%;
    right: 50%;
    width: 620px;
    height: 620px;
    transform: translateX(50%);
  }

  .section-heading,
  .comments-section,
  .faq-section {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .section-heading > p:last-child {
    margin-top: 24px;
  }

  .feature-card-wide {
    grid-template-columns: 1fr 0.8fr;
  }

  .download-section {
    grid-template-columns: 1fr;
  }

  .xiaohongshu-profile {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 0.44fr);
    align-items: center;
  }

  footer {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .site-header {
    min-height: 66px;
    padding: 0 20px;
  }

  .hero,
  .intro,
  .day-section,
  .xiaohongshu-section,
  .comments-section,
  .faq-section,
  .download-section {
    padding-right: 20px;
    padding-left: 20px;
  }

  .hero {
    padding-top: 130px;
    padding-bottom: 34px;
  }

  h1 {
    font-size: clamp(46px, 14vw, 68px);
  }

  .hero-lead {
    font-size: 18px;
  }

  .hero-actions,
  .download-buttons {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-visual {
    min-height: clamp(500px, 105vw, 630px);
  }

  .hero-animation,
  .hero-fallback {
    bottom: 0;
    width: min(110vw, 520px);
  }

  .hero-orbit {
    width: 460px;
    height: 460px;
  }

  .intro,
  .day-section,
  .comments-section,
  .faq-section {
    padding-top: 86px;
    padding-bottom: 86px;
  }

  .section-heading {
    display: block;
    margin-bottom: 42px;
  }

  .section-heading h2,
  .download-copy h2,
  .comments-intro h2 {
    font-size: 43px;
  }

  .feature-grid,
  .day-cards {
    grid-template-columns: 1fr;
  }

  .feature-card-wide {
    display: block;
  }

  .feature-card-reverse .feature-media {
    order: initial;
  }

  .feature-media {
    min-height: 330px;
  }

  .feature-copy {
    padding: 30px;
  }

  .day-card img {
    aspect-ratio: 4 / 4.8;
  }

  .download-section {
    min-height: auto;
    padding-top: 90px;
    padding-bottom: 90px;
  }

  .xiaohongshu-profile {
    display: grid;
    grid-template-columns: 1fr;
    padding: 26px;
  }

  .release-meta {
    gap: 28px;
  }

  .install-card {
    padding: 28px 24px;
  }

  .comments-section {
    display: block;
  }

  .comment-wall {
    min-height: 0;
    margin-top: 56px;
    padding: 22px;
  }

  .form-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .faq-section {
    display: block;
  }

  .faq-list {
    margin-top: 45px;
  }

  footer {
    grid-template-columns: 1fr;
    padding: 38px 20px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero-animation {
    display: none;
  }

  .hero-fallback {
    display: block;
  }
}