:root {
  color-scheme: dark;
  --bg: #05070b;
  --bg-soft: #0a0f15;
  --panel: rgba(9, 14, 20, 0.76);
  --panel-solid: #0d141d;
  --line: rgba(220, 232, 246, 0.14);
  --line-strong: rgba(93, 214, 255, 0.38);
  --text: #f7fbff;
  --soft: #d5e0ea;
  --muted: #93a1af;
  --cyan: #61d8ff;
  --green: #7cf0be;
  --gold: #f2c96f;
  --radius: 8px;
  --shadow: 0 34px 90px rgba(0, 0, 0, 0.46);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text);
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background:
    linear-gradient(180deg, #05070b 0%, #09111a 45%, #05070b 100%),
    var(--bg);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  content: "";
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 84px 84px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 68%);
}

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

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

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

p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
  overflow-wrap: anywhere;
}

h1 {
  margin-bottom: 22px;
  max-width: 920px;
  font-size: clamp(54px, 6.6vw, 96px);
  line-height: 0.98;
  font-weight: 950;
  letter-spacing: 0;
}

.keep {
  white-space: nowrap;
}

h2 {
  margin-bottom: 14px;
  max-width: 820px;
  font-size: clamp(32px, 4.8vw, 62px);
  line-height: 1.06;
  font-weight: 940;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: 0;
}

.site-header,
.section,
.site-footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  top: 16px;
  right: 0;
  left: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  min-height: 58px;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius);
  background: rgba(5, 8, 12, 0.7);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 144px;
  font-size: 17px;
  font-weight: 920;
}

.brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  border-radius: var(--radius);
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 2px;
}

.site-nav a,
.header-action,
.button,
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border-radius: var(--radius);
  color: var(--soft);
  font-size: 14px;
  font-weight: 850;
  white-space: nowrap;
}

.site-nav a {
  padding: 0 14px;
}

.site-nav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.075);
}

.header-action,
.button.primary {
  color: #041018;
  background: linear-gradient(135deg, var(--cyan), var(--green));
}

.header-action {
  padding: 0 16px;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: 128px 0 116px;
}

.hero-media,
.hero-media img,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 70% center;
  filter: saturate(1.12) contrast(1.08) brightness(0.86);
}

.hero-shade {
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(3, 5, 9, 0.98) 0%, rgba(3, 5, 9, 0.82) 37%, rgba(3, 5, 9, 0.3) 78%, rgba(3, 5, 9, 0.62) 100%),
    linear-gradient(180deg, rgba(3, 5, 9, 0.12) 0%, rgba(3, 5, 9, 0.92) 100%);
}

.hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 3;
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--cyan), var(--green), transparent);
}

.hero-copy {
  position: relative;
  z-index: 4;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 920;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-lead {
  max-width: 680px;
  margin-bottom: 0;
  color: #eef7ff;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.65;
}

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

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-width: 720px;
  margin-top: 22px;
}

.hero-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  color: var(--soft);
  font-size: 13px;
  font-weight: 850;
  background: rgba(255, 255, 255, 0.065);
  backdrop-filter: blur(12px);
}

.button {
  min-height: 48px;
  gap: 9px;
  padding: 0 18px;
  border: 1px solid transparent;
}

.button.secondary {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(12px);
}

.button:hover,
.header-action:hover,
.text-link:hover {
  transform: translateY(-1px);
}

.hero-panel {
  position: absolute;
  right: max(20px, calc((100vw - 1180px) / 2));
  bottom: 34px;
  left: max(20px, calc((100vw - 1180px) / 2));
  z-index: 5;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero-panel div {
  min-height: 116px;
  padding: 20px;
  background: rgba(5, 9, 13, 0.72);
}

.hero-panel span,
.flow-grid span,
.advantage-grid span,
.status-card span,
.group-box span {
  display: block;
  color: var(--gold);
  font-size: 12px;
  line-height: 1.3;
  font-weight: 900;
  text-transform: uppercase;
}

.hero-panel strong {
  display: block;
  margin: 10px 0 7px;
  color: var(--text);
  font-size: 26px;
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-panel small {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.section {
  padding-top: 92px;
}

.fit {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 430px);
  gap: 34px;
  align-items: start;
}

.fit-copy p {
  max-width: 720px;
  color: var(--soft);
  font-size: 16px;
}

.fit-panel {
  padding: 24px;
  border: 1px solid rgba(124, 240, 190, 0.28);
  border-radius: var(--radius);
  background:
    linear-gradient(145deg, rgba(124, 240, 190, 0.105), rgba(255, 255, 255, 0.025)),
    var(--panel-solid);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.22);
}

.fit-panel span {
  display: block;
  color: var(--gold);
  font-size: 12px;
  line-height: 1.3;
  font-weight: 900;
  text-transform: uppercase;
}

.fit-panel ul {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.fit-panel li {
  position: relative;
  padding-left: 20px;
  color: var(--soft);
  font-size: 15px;
  line-height: 1.65;
}

.fit-panel li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  content: "";
  background: var(--green);
}

.link-flow {
  margin-top: 0;
}

.flow-heading,
.section-head {
  max-width: 780px;
  margin-bottom: 30px;
}

.section-head p,
.flow-heading p,
.join-copy p {
  max-width: 690px;
  color: var(--soft);
  font-size: 16px;
}

.flow-grid,
.advantage-grid,
.path-grid,
.option-grid,
.tuning-grid,
.support-grid {
  display: grid;
  gap: 14px;
}

.flow-grid,
.advantage-grid,
.path-grid,
.option-grid,
.support-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tuning-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.flow-grid article,
.advantage-grid article,
.option-card,
.tuning-grid article,
.support-grid article,
.path-card,
.status-card,
.group-box,
.video-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.02)),
    var(--panel-solid);
}

.flow-grid article,
.advantage-grid article,
.option-card,
.tuning-grid article,
.support-grid article,
.path-card {
  min-height: 238px;
  padding: 24px;
}

.flow-grid h3,
.advantage-grid h3,
.option-grid h3,
.support-grid h3 {
  margin-top: 18px;
}

.flow-grid p,
.advantage-grid p,
.option-card p,
.tuning-grid p,
.support-grid p,
.path-card p {
  margin-bottom: 0;
}

.option-card {
  min-height: 390px;
}

.option-card ul {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.option-card li {
  position: relative;
  padding-left: 18px;
  color: var(--soft);
  font-size: 14px;
  line-height: 1.65;
}

.option-card li::before {
  position: absolute;
  top: 0.74em;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  content: "";
  background: var(--cyan);
}

.option-card span {
  display: block;
  color: var(--gold);
  font-size: 12px;
  line-height: 1.3;
  font-weight: 900;
  text-transform: uppercase;
}

.support-grid span {
  display: block;
  color: var(--gold);
  font-size: 12px;
  line-height: 1.3;
  font-weight: 900;
  text-transform: uppercase;
}

.tuning-grid article {
  min-height: 198px;
}

.tuning-grid strong {
  display: block;
  margin-bottom: 12px;
  color: var(--text);
  font-size: 22px;
  line-height: 1.25;
}

.path-card {
  transition: border-color 160ms ease, transform 160ms ease;
}

.path-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.path-card span {
  display: block;
  color: var(--gold);
  font-size: 12px;
  line-height: 1.3;
  font-weight: 900;
  text-transform: uppercase;
}

.path-card strong {
  display: block;
  margin: 18px 0 10px;
  color: var(--text);
  font-size: 22px;
  line-height: 1.25;
}

.demo-layout {
  display: grid;
  grid-template-columns: minmax(320px, 430px) minmax(0, 1fr);
  gap: 34px;
  align-items: stretch;
}

.demo-main .section-head {
  margin-bottom: 24px;
}

.demo-main .section-head p {
  max-width: 430px;
}

.video-frame {
  margin: 0;
  padding: 10px;
  box-shadow: var(--shadow);
}

.video-frame video {
  width: 100%;
  aspect-ratio: 9 / 16;
  border-radius: 6px;
  background: #030508;
  object-fit: cover;
}

figcaption {
  padding: 10px 8px 2px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.demo-side {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 18px;
  min-height: 100%;
  padding-top: 4px;
}

.demo-summary {
  max-width: none;
  padding: 22px 0 20px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.demo-summary span {
  display: block;
  margin-bottom: 12px;
  color: var(--gold);
  font-size: 12px;
  line-height: 1.3;
  font-weight: 900;
  text-transform: uppercase;
}

.demo-summary h3 {
  margin-bottom: 12px;
  font-size: clamp(30px, 3.4vw, 46px);
  line-height: 1.06;
}

.demo-summary p {
  max-width: 620px;
  margin-bottom: 0;
  color: var(--soft);
  font-size: 16px;
}

.demo-copy {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  align-content: stretch;
}

.status-card {
  display: grid;
  align-content: center;
  min-height: 112px;
  padding: 18px;
}

.status-card strong {
  display: block;
  margin-top: 14px;
  color: var(--text);
  font-size: 21px;
  line-height: 1.45;
}

.status-card p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.demo-action {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.demo-action p {
  max-width: 430px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.text-link {
  min-height: 44px;
  padding: 0 16px;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.07);
}

.join {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: 34px;
  align-items: center;
  padding-bottom: 26px;
}

.group-box {
  padding: 28px;
  border-color: rgba(124, 240, 190, 0.34);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.24);
}

.group-box strong {
  display: block;
  margin: 10px 0 8px;
  color: var(--text);
  font-size: clamp(38px, 5vw, 56px);
  line-height: 1;
  letter-spacing: 0;
}

.group-box p {
  margin-bottom: 0;
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-top: 72px;
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.site-footer span {
  color: var(--text);
  font-weight: 900;
}

.site-footer a:hover {
  color: var(--text);
}

@media (max-width: 980px) {
  .site-header {
    position: absolute;
    grid-template-columns: 1fr auto;
    gap: 8px 12px;
  }

  .site-nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .hero {
    min-height: 880px;
    align-items: start;
    padding-top: 138px;
  }

  .hero-copy {
    margin-top: 76px;
  }

  .hero-panel,
  .fit,
  .flow-grid,
  .advantage-grid,
  .option-grid,
  .tuning-grid,
  .support-grid,
  .path-grid,
  .demo-layout,
  .demo-copy,
  .join {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    position: relative;
    right: auto;
    bottom: auto;
    left: auto;
    width: min(1180px, calc(100% - 40px));
    margin: 42px auto 0;
  }

  .demo-layout {
    align-items: start;
  }

  .video-frame {
    width: min(100%, 380px);
  }
}

@media (max-width: 620px) {
  .site-header,
  .section,
  .site-footer,
  .hero-copy,
  .hero-panel {
    width: auto;
    margin-right: 16px;
    margin-left: 16px;
  }

  .site-header {
    right: 16px;
    left: 16px;
    top: 10px;
    width: auto;
    margin-right: 0;
    margin-left: 0;
    padding: 8px;
  }

  .brand {
    min-width: 0;
  }

  .brand img {
    width: 30px;
    height: 30px;
  }

  .site-nav {
    display: none;
  }

  .header-action {
    min-height: 34px;
    padding-inline: 10px;
    font-size: 13px;
  }

  .hero {
    min-height: 830px;
    padding-top: 116px;
  }

  .hero-copy {
    margin-top: 42px;
  }

  .hero-media img {
    object-position: 64% center;
  }

  h1 {
    font-size: 48px;
  }

  h2 {
    font-size: 31px;
  }

  .hero-lead,
  .section-head p,
  .flow-heading p,
  .join-copy p {
    font-size: 15px;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .button {
    justify-content: center;
  }

  .hero-panel div,
  .flow-grid article,
  .advantage-grid article,
  .option-card,
  .tuning-grid article,
  .support-grid article,
  .path-card,
  .status-card,
  .group-box {
    padding: 20px;
  }

  .hero-panel strong {
    font-size: 23px;
  }

  .section {
    padding-top: 64px;
  }

  .site-footer {
    flex-direction: column;
  }
}