@charset "UTF-8";

:root {
  --bg: #090b14;
  --bg-soft: #11162a;
  --panel: rgba(20, 26, 46, 0.82);
  --panel-strong: #151c31;
  --line: rgba(255, 255, 255, 0.08);
  --text: #f3f5ff;
  --muted: #9aa6c7;
  --accent: #65f0ff;
  --accent-strong: #7f7cff;
  --accent-warm: #ff7fb3;
  --success: #3ddc84;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(127, 124, 255, 0.22), transparent 28%),
    radial-gradient(circle at top right, rgba(101, 240, 255, 0.16), transparent 30%),
    linear-gradient(180deg, #070911 0%, #0a1020 48%, #090b14 100%);
}

body,
a,
button {
  -webkit-tap-highlight-color: transparent;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.container {
  width: min(1200px, calc(100% - 40px));
  margin: 0 auto;
}

.page-shell {
  position: relative;
  overflow: hidden;
}

.page-shell::before,
.page-shell::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.page-shell::before {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.18;
}

.page-shell::after {
  background: linear-gradient(180deg, rgba(9, 11, 20, 0) 0%, rgba(9, 11, 20, 0.32) 100%);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(6, 9, 17, 0.72);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 82px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}

.brand span {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  font-size: 14px;
  color: var(--muted);
  border-radius: 999px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 999px;
}

.nav-toggle span + span {
  margin-top: 6px;
}

.hero-section,
.feature-section,
.experience-section,
.scene-section,
.download-section,
.faq-section {
  position: relative;
  z-index: 1;
}

.hero-section {
  padding: 56px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 36px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(46px, 7vw, 86px);
  line-height: 0.95;
}

.hero-text {
  margin: 20px 0 0;
  max-width: 580px;
  color: #d8deef;
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.download-card,
.download-panel {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 88px;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.download-card:hover,
.download-card:focus-visible,
.download-panel:hover,
.download-panel:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(101, 240, 255, 0.3);
}

.download-card span,
.download-panel span {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.download-card strong,
.download-panel strong {
  font-size: 17px;
}

.download-card em,
.download-panel em {
  font-style: normal;
  color: var(--muted);
  font-size: 13px;
}

.hero-data {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.hero-data li {
  min-height: 118px;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.hero-data strong,
.experience-list strong,
.gallery-strip strong {
  display: block;
  margin-bottom: 8px;
  font-size: 17px;
}

.hero-data span,
.experience-list span,
.gallery-strip span,
.feature-card p,
.scene-grid p,
.faq-answer p,
.section-head p,
.download-copy p,
.site-footer p {
  color: var(--muted);
  line-height: 1.75;
}

.hero-visual {
  display: flex;
  justify-content: flex-end;
}

.visual-stage {
  position: relative;
  width: min(100%, 540px);
  min-height: 640px;
}

.stage-main,
.stage-side {
  position: absolute;
  overflow: hidden;
  border-radius: 28px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 26px 70px rgba(0, 0, 0, 0.4);
  background: #0a0f1f;
}

.stage-main {
  inset: 48px 112px 0 0;
}

.stage-side {
  width: 180px;
  right: 0;
}

.side-top {
  top: 0;
  height: 278px;
}

.side-bottom {
  bottom: 64px;
  height: 268px;
}

.stage-main img,
.stage-side img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.floating-note {
  position: absolute;
  min-height: 52px;
  padding: 12px 16px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  max-width: 220px;
  color: var(--text);
  font-size: 13px;
  background: rgba(10, 14, 27, 0.84);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 18px 34px rgba(0, 0, 0, 0.25);
}

.note-a {
  left: 24px;
  bottom: 86px;
}

.note-b {
  right: 94px;
  top: 244px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section-head.compact {
  align-items: flex-start;
}

.section-head h2 {
  margin: 0;
  max-width: 640px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
}

.section-head p {
  margin: 0;
  max-width: 420px;
  font-size: 15px;
}

.feature-section {
  padding: 28px 0 26px;
}

.feature-layout {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 16px;
}

.feature-card {
  grid-column: span 4;
  min-height: 260px;
  padding: 24px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.feature-card-stack {
  display: flex;
  flex-direction: column;
}

.feature-card-large {
  grid-column: span 8;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  align-items: center;
  gap: 22px;
  min-height: 340px;
}

.feature-card-media {
  align-self: stretch;
  min-height: 100%;
  overflow: hidden;
  border-radius: 18px;
}

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

.feature-card-inline-media {
  margin-top: 18px;
  margin-left: -2px;
  margin-right: -2px;
  margin-bottom: -2px;
  flex: 1;
  min-height: 280px;
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: #0a0f1f;
}

.feature-card-inline-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.card-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  height: 30px;
  margin-bottom: 18px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(127, 124, 255, 0.18);
  color: #b7bcff;
  font-size: 12px;
  font-weight: 700;
}

.feature-card h3 {
  margin: 0 0 14px;
  font-size: 26px;
  line-height: 1.22;
}

.feature-card p {
  margin: 0;
  font-size: 15px;
}

.accent-card {
  background: linear-gradient(180deg, rgba(127, 124, 255, 0.18), rgba(255, 255, 255, 0.03));
}

.dark-card {
  background: linear-gradient(180deg, rgba(255, 127, 179, 0.16), rgba(255, 255, 255, 0.03));
}

.experience-section {
  padding: 42px 0 24px;
}

.experience-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 18px;
}

.experience-panel,
.scene-shell,
.download-shell,
.faq-item,
.site-footer {
  border: 1px solid rgba(255, 255, 255, 0.07);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.experience-panel {
  border-radius: 24px;
  padding: 28px;
}

.panel-copy h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.16;
}

.panel-copy > p:last-of-type {
  margin: 18px 0 0;
  color: #d6dcf0;
  line-height: 1.9;
}

.experience-list {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.experience-list div {
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.experience-list div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.panel-gallery {
  display: grid;
  gap: 16px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.gallery-grid figure {
  margin: 0;
  min-height: 420px;
  border-radius: 20px;
  overflow: hidden;
}

.gallery-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.gallery-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.gallery-strip div {
  min-height: 118px;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
}

.scene-section {
  padding: 26px 0 24px;
}

.scene-shell {
  border-radius: 26px;
  padding: 28px;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.scene-grid article {
  min-height: 220px;
  padding: 22px;
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    radial-gradient(circle at top right, rgba(101, 240, 255, 0.18), transparent 46%);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.scene-grid h3 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.25;
}

.scene-grid p {
  margin: 0;
  font-size: 14px;
}

.download-section {
  padding: 24px 0;
}

.download-shell {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 24px;
  align-items: center;
  padding: 28px;
  border-radius: 26px;
}

.download-copy h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.14;
}

.download-copy p:last-child {
  margin: 18px 0 0;
  color: #d6dcf0;
}

.download-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.download-panel {
  min-height: 128px;
}

.download-panel.android {
  background: linear-gradient(180deg, rgba(61, 220, 132, 0.18), rgba(255, 255, 255, 0.03));
}

.download-panel.ios {
  background: linear-gradient(180deg, rgba(127, 124, 255, 0.18), rgba(255, 255, 255, 0.03));
}

.faq-section {
  padding: 24px 0 56px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  border-radius: 20px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 76px;
  padding: 0 22px;
  text-align: left;
}

.faq-question span {
  font-size: 18px;
  font-weight: 600;
}

.faq-question b {
  position: relative;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.faq-question b::before,
.faq-question b::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 999px;
  transform: translate(-50%, -50%);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.faq-question b::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item.is-open .faq-question b::after {
  opacity: 0;
}

.faq-answer {
  display: none;
  padding: 0 22px 22px;
}

.faq-item.is-open .faq-answer {
  display: block;
}

.faq-answer p {
  margin: 0;
  font-size: 15px;
}

.site-footer {
  position: relative;
  z-index: 1;
  border-width: 1px 0 0;
  border-radius: 0;
  background: rgba(6, 9, 17, 0.9);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 88px;
}

.footer-brand img {
  width: 34px;
  height: 34px;
}

.footer-brand span {
  font-size: 20px;
}

.site-footer p {
  margin: 0;
  font-size: 14px;
}

.icon {
  display: inline-block;
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

.icon-android {
  background-image: url("../icons/android.svg");
}

.icon-apple {
  background-image: url("../icons/apple.svg");
  filter: invert(1);
}

@media (max-width: 1080px) {
  .hero-grid,
  .experience-grid,
  .download-shell {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    justify-content: flex-start;
  }

  .visual-stage {
    width: 100%;
    min-height: 620px;
  }

  .feature-card,
  .feature-card-large {
    grid-column: span 12;
  }

  .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-head p {
    max-width: 680px;
  }
}

@media (max-width: 760px) {
  body {
    padding-top: 86px;
  }

  .container {
    width: min(100% - 28px, 1200px);
  }

  .site-header {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
  }

  .header-inner {
    min-height: 74px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: calc(100% + 10px);
    padding: 12px;
    border-radius: 18px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(9, 12, 22, 0.94);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  }

  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav a {
    justify-content: flex-start;
    min-height: 46px;
    padding: 0 12px;
  }

  .hero-section {
    padding-top: 20px;
  }

  .hero-copy h1,
  .section-head h2,
  .panel-copy h2,
  .download-copy h2 {
    word-break: break-word;
  }

  .hero-text {
    font-size: 16px;
  }

  .hero-actions,
  .download-actions,
  .hero-data,
  .gallery-strip,
  .scene-grid {
    grid-template-columns: 1fr;
  }

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

  .feature-card-media {
    min-height: 280px;
  }

  .feature-card-inline-media {
    min-height: 260px;
  }

  .visual-stage {
    min-height: 510px;
  }

  .stage-main {
    inset: 32px 72px 0 0;
  }

  .stage-side {
    width: 132px;
  }

  .side-top {
    height: 214px;
  }

  .side-bottom {
    height: 200px;
    bottom: 48px;
  }

  .note-a {
    left: 10px;
    bottom: 58px;
  }

  .note-b {
    right: 54px;
    top: 188px;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid figure {
    min-height: 340px;
  }

  .download-shell,
  .scene-shell,
  .experience-panel,
  .feature-card {
    padding: 22px;
  }

  .footer-inner {
    flex-direction: column;
    justify-content: center;
    min-height: 108px;
    padding: 18px 0;
  }
}

@media (max-width: 520px) {
  .brand span {
    font-size: 20px;
  }

  .hero-copy h1 {
    font-size: 44px;
  }

  .feature-card h3,
  .scene-grid h3,
  .faq-question span {
    font-size: 20px;
  }

  .hero-data li,
  .gallery-strip div,
  .scene-grid article,
  .download-card,
  .download-panel {
    min-height: auto;
  }

  .download-card,
  .download-panel {
    align-items: flex-start;
  }

  .floating-note {
    max-width: 176px;
    font-size: 12px;
  }
}