:root {
  --bg-top: #7f90ff;
  --bg-bottom: #626be4;
  --panel: rgba(255, 255, 255, 0.11);
  --panel-strong: rgba(255, 255, 255, 0.16);
  --panel-border: rgba(255, 255, 255, 0.22);
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.78);
  --shadow: 0 30px 80px rgba(31, 36, 111, 0.2);
  --shadow-soft: 0 18px 40px rgba(31, 36, 111, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 8%, rgba(255, 255, 255, 0.22), transparent 18%),
    radial-gradient(circle at 92% 14%, rgba(255, 255, 255, 0.12), transparent 16%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
}

body::before,
body::after {
  content: "";
  position: fixed;
  border-radius: 999px;
  pointer-events: none;
  filter: blur(24px);
  opacity: 0.32;
}

body::before {
  top: 18%;
  right: -7rem;
  width: 18rem;
  height: 18rem;
  background: rgba(68, 46, 211, 0.5);
}

body::after {
  left: -5rem;
  bottom: 8%;
  width: 14rem;
  height: 14rem;
  background: rgba(255, 255, 255, 0.18);
}

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

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

.page {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 44px 0 56px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.brand-home {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.28rem;
  font-weight: 700;
}

.brand-home img {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  box-shadow: 0 12px 24px rgba(24, 28, 92, 0.2);
}

.top-nav {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
}

.top-nav-link {
  padding: 10px 16px;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.8);
  transition: background 180ms ease, color 180ms ease;
}

.top-nav-link.is-active {
  background: rgba(255, 255, 255, 0.95);
  color: #4d59d8;
  font-weight: 700;
}

.hero {
  padding: 12px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: start;
}

.hero-copy {
  max-width: 820px;
}

.hero-icon-panel {
  display: flex;
  justify-content: flex-end;
  padding-top: 40px;
}

.hero-icon-shell {
  display: grid;
  place-items: center;
  width: 340px;
  aspect-ratio: 1;
  border: 1px solid var(--panel-border);
  border-radius: 38px;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-icon-shell img {
  width: 78%;
  border-radius: 30px;
  box-shadow: 0 24px 60px rgba(24, 28, 92, 0.24);
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.72);
}

.hero h1,
.download-copy h2,
.hero-panel h2,
.footer-card h2 {
  margin: 0;
  line-height: 0.94;
  letter-spacing: -0.05em;
}

.hero h1 {
  max-width: 8ch;
  font-size: clamp(4rem, 9vw, 7.2rem);
}

.hero-text {
  max-width: 700px;
  margin: 26px 0 0;
  font-size: 1.08rem;
  line-height: 1.95;
  color: var(--muted);
}

.tabs-shell,
.download-band,
.feedback-band,
.footer-card {
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(18px);
}

.download-meta,
.footer-text {
  margin: 14px 0 0;
  line-height: 1.8;
  color: var(--muted);
}

.panel-statement {
  margin: 8px 0 0;
  font-size: clamp(1.55rem, 3vw, 2.5rem);
  line-height: 1.35;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.tabs-shell {
  margin-top: 38px;
  padding: 18px;
  border-radius: 34px;
  box-shadow: var(--shadow);
}

.tabs-nav {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.tab-button {
  min-height: 46px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.78);
  font: inherit;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}

.tab-button:hover {
  transform: translateY(-1px);
}

.tab-button.is-active {
  background: rgba(255, 255, 255, 0.96);
  color: #4d59d8;
  font-weight: 700;
}

.tab-panel[hidden] {
  display: none;
}

.download-band {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 24px;
  align-items: center;
  padding: 28px;
  border-radius: 34px;
}

.download-copy h2,
.feedback-copy h2,
.footer-card h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

.download-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.download-card {
  min-height: 156px;
  padding: 22px;
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.95);
  color: #4d59d8;
  box-shadow: var(--shadow-soft);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.download-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 48px rgba(24, 28, 92, 0.18);
}

.download-platform {
  display: inline-block;
  margin-bottom: 28px;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  color: rgba(77, 89, 216, 0.78);
}

.download-card strong {
  display: block;
  font-size: 2rem;
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.feedback-band {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 420px);
  gap: 24px;
  align-items: center;
  padding: 28px;
  border-radius: 34px;
}

.feedback-name {
  margin: 18px 0 0;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #ffffff;
}

.qr-card {
  padding: 18px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.08);
}

.qr-image {
  width: 100%;
  border-radius: 24px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.footer-note {
  margin-top: 18px;
}

.roadmap-section {
  margin-top: 18px;
}

.roadmap-card {
  padding: 24px 26px;
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
}

.roadmap-status-row {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 12px;
  margin-top: 6px;
}

.roadmap-steps {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 12px;
  align-items: center;
  margin-top: 10px;
}

.roadmap-status {
  margin: 0;
  font-size: 1rem;
  color: #ffffff;
  text-align: center;
  grid-column: 1;
}

.roadmap-step {
  padding: 18px 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.08);
  text-align: center;
}

.roadmap-step-active {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.42);
  box-shadow: 0 18px 36px rgba(24, 28, 92, 0.16);
}

.roadmap-step span {
  display: block;
  margin-bottom: 10px;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.66);
}

.roadmap-step-active span,
.roadmap-step-active strong,
.roadmap-step-active p {
  color: #ffffff;
}

.roadmap-step-upcoming {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
}

.roadmap-step-upcoming span,
.roadmap-step-upcoming strong,
.roadmap-step-upcoming p {
  color: rgba(255, 255, 255, 0.58);
}

.roadmap-step strong {
  display: block;
  font-size: 1.15rem;
  line-height: 1.3;
}

.roadmap-step p {
  margin: 12px 0 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.82);
}

.roadmap-divider {
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.48), rgba(255, 255, 255, 0.12));
}

.footer-note .footer-card {
  max-width: none;
  width: 100%;
}

.footer-card h2 {
  line-height: 1.08;
}

.footer-text {
  margin-top: 18px;
}

.footer-card {
  padding: 24px 26px;
  border-radius: 30px;
  box-shadow: var(--shadow-soft);
}

.footer-card > .eyebrow {
  font-size: 1.08rem;
  letter-spacing: 0.14em;
}

.showcase-hero {
  padding: 18px 0 8px;
}

.showcase-hero h1 {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.author-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-top: 14px;
}

.author-item {
  padding: 20px 20px 24px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.09);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.author-label {
  display: block;
  margin-bottom: 14px;
  font-size: 0.98rem;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.68);
}

.author-qr {
  width: 100%;
  max-width: 250px;
  aspect-ratio: 1;
  object-fit: cover;
  padding: 10px;
  margin-bottom: 18px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 18px 36px rgba(24, 28, 92, 0.14);
}

.author-item strong {
  display: block;
  font-size: 1.2rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
  max-width: 14ch;
}

@media (max-width: 980px) {
  .hero,
  .download-band,
  .feedback-band {
    grid-template-columns: 1fr;
  }

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

  .roadmap-steps {
    grid-template-columns: 1fr;
  }

  .roadmap-status-row {
    grid-template-columns: 1fr;
  }

  .roadmap-divider {
    width: 1px;
    height: 22px;
    margin: 0 auto;
  }

  .hero-icon-panel {
    justify-content: flex-start;
    padding-top: 0;
  }
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 24px, 1160px);
    padding-top: 26px;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-nav {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    padding-top: 6px;
    gap: 18px;
  }

  .hero h1 {
    max-width: 100%;
    font-size: clamp(3rem, 15vw, 5rem);
  }

  .hero-text {
    font-size: 1rem;
    line-height: 1.82;
  }

  .tabs-shell,
  .download-band,
  .footer-card {
    border-radius: 24px;
  }

  .tabs-shell,
  .download-band,
  .feedback-band,
  .footer-card {
    padding: 20px;
  }

  .hero-icon-shell {
    width: 240px;
    border-radius: 28px;
  }

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

  .download-card strong {
    font-size: 1.7rem;
  }

  .author-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}