:root {
  --bg: #f4f7ff;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: #ffffff;
  --text: #18213d;
  --muted: #64708b;
  --line: rgba(91, 127, 255, 0.16);
  --primary: #2f6bff;
  --primary-deep: #2654f5;
  --primary-soft: #eef3ff;
  --accent: #5b7cff;
  --shadow: 0 24px 70px rgba(58, 93, 214, 0.16);
  --shadow-soft: 0 14px 40px rgba(58, 93, 214, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --container: 1200px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.65;
  background:
    radial-gradient(circle at 16% 12%, rgba(93, 130, 255, 0.22), transparent 20%),
    radial-gradient(circle at 78% 20%, rgba(66, 110, 255, 0.24), transparent 24%),
    radial-gradient(circle at 50% 78%, rgba(125, 155, 255, 0.18), transparent 28%),
    linear-gradient(180deg, #fbfcff 0%, #f5f8ff 42%, #ffffff 100%);
  min-height: 100vh;
}

body.is-busy {
  cursor: progress;
}

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

button {
  font: inherit;
}

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

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid rgba(77, 117, 255, 0.16);
  background: rgba(255, 255, 255, 0.72);
  color: var(--primary);
  font-size: 0.95rem;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(71, 104, 214, 0.08);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.95rem);
  line-height: 1.2;
  margin-top: 18px;
  margin-bottom: 18px;
  letter-spacing: -0.03em;
}

.section-description {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.05rem;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(18px);
  background: rgba(255, 255, 255, 0.78);
  border-bottom: 1px solid rgba(95, 126, 255, 0.1);
}

.navbar-container {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.logo {
  height: 40px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: #33405f;
  font-size: 0.98rem;
  font-weight: 600;
  transition: color 0.25s ease;
  position: relative;
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(135deg, #6fa1ff, #2f6bff);
  box-shadow: 0 14px 30px rgba(47, 107, 255, 0.25);
  font-weight: 700;
  white-space: nowrap;
}

.hero-section {
  position: relative;
  overflow: hidden;
  padding: 72px 0 48px;
}

.hero-shell {
  position: relative;
  padding: 42px 0 10px;
}

.hero-section::before,
.hero-section::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(12px);
  pointer-events: none;
}

.hero-section::before {
  width: 640px;
  height: 640px;
  right: -120px;
  top: -60px;
  background: radial-gradient(circle, rgba(79, 120, 255, 0.34) 0%, rgba(79, 120, 255, 0.08) 42%, transparent 70%);
}

.hero-section::after {
  width: 440px;
  height: 440px;
  left: -120px;
  top: 20px;
  background: radial-gradient(circle, rgba(151, 176, 255, 0.28) 0%, transparent 70%);
}

.hero-content {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
  align-items: center;
  gap: 48px;
  min-height: 620px;
  position: relative;
  z-index: 1;
}

.hero-text {
  max-width: 560px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(84, 121, 255, 0.16);
  color: var(--primary);
  font-weight: 700;
  box-shadow: 0 12px 26px rgba(72, 110, 224, 0.1);
  margin-bottom: 22px;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.25rem);
  line-height: 1.05;
  letter-spacing: -0.05em;
  margin-bottom: 18px;
  font-weight: 800;
}

.hero-title .accent {
  display: block;
  color: var(--primary);
}

.hero-subtitle {
  font-size: clamp(1.7rem, 3vw, 2.45rem);
  line-height: 1.2;
  margin-bottom: 24px;
  font-weight: 800;
  color: #222b4c;
}

.hero-description {
  color: #5d6883;
  font-size: 1.16rem;
  max-width: 540px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 18px;
}

.primary-button,
.secondary-button {
  min-width: 168px;
  padding: 15px 28px;
  border-radius: 16px;
  border: 1px solid transparent;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.primary-button {
  color: #fff;
  background: linear-gradient(135deg, #76a6ff, #2f6bff);
  box-shadow: 0 18px 34px rgba(47, 107, 255, 0.28);
}

.primary-button:hover:not(:disabled),
.secondary-button:hover {
  transform: translateY(-2px);
}

.primary-button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  box-shadow: none;
}

.secondary-button {
  color: var(--primary);
  background: rgba(255, 255, 255, 0.82);
  border-color: rgba(91, 124, 255, 0.22);
  box-shadow: 0 12px 24px rgba(77, 109, 219, 0.08);
}

.download-info {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: 0.98rem;
}

.download-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 700;
}

.download-status {
  width: 100%;
  min-height: 24px;
  font-size: 0.95rem;
  color: var(--muted);
}

.download-status.is-success {
  color: #21764f;
}

.download-status.is-warning {
  color: #a45b00;
}

.download-status.is-error {
  color: #c53b3b;
}

.hero-visual {
  position: relative;
  min-height: 590px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-orbit {
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(68, 111, 255, 0.18) 0%, rgba(68, 111, 255, 0.08) 26%, rgba(68, 111, 255, 0.03) 45%, transparent 64%),
    repeating-radial-gradient(circle, rgba(113, 146, 255, 0.14) 0 2px, transparent 2px 58px);
  filter: blur(0.3px);
  opacity: 0.98;
}

.hero-orbit::before,
.hero-orbit::after {
  content: '';
  position: absolute;
  inset: 74px;
  border-radius: 50%;
  border: 1px dashed rgba(115, 145, 255, 0.18);
}

.hero-orbit::after {
  inset: 138px;
  border-style: solid;
  border-color: rgba(124, 152, 255, 0.16);
}

.visual-glow {
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(63, 108, 255, 0.35) 0%, rgba(63, 108, 255, 0.1) 38%, transparent 72%);
  filter: blur(10px);
}

.hero-cards {
  position: relative;
  width: 100%;
  height: 560px;
  max-width: 560px;
  z-index: 1;
}

.card {
  position: absolute;
  min-width: 190px;
  padding: 18px 26px;
  border-radius: 18px;
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.01em;
  box-shadow: 0 18px 40px rgba(58, 90, 191, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(10px);
}

.card small {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  opacity: 0.86;
  margin-top: 4px;
}

.card-1 { top: 54px; left: 124px; background: linear-gradient(135deg, #4f88ff, #2c65ff); transform: rotate(11deg); }
.card-2 { top: 68px; right: 14px; background: linear-gradient(135deg, #32c5a4, #2f92df); transform: rotate(-10deg); }
.card-3 { top: 206px; left: 66px; background: linear-gradient(135deg, #715dff, #4b33f5); transform: rotate(-7deg); }
.card-4 { top: 184px; right: 62px; background: linear-gradient(135deg, #ff9f43, #ff7a3d); transform: rotate(9deg); }
.card-5 { bottom: 122px; left: 118px; background: linear-gradient(135deg, #ff6872, #ff4b64); transform: rotate(-24deg); }
.card-6 { bottom: 112px; right: 18px; background: linear-gradient(135deg, #22c3ea, #1b8bff); transform: rotate(12deg); }

.hero-stars {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 22px;
}

.rating-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.rating-logo-only {
  height: 28px;
  width: auto;
  display: block;
  flex: 0 0 auto;
}

.stars {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.star {
  color: #ffc400;
  font-size: 1.5rem;
  line-height: 1;
}

.rating-divider {
  width: 1px;
  height: 28px;
  background: rgba(112, 122, 148, 0.38);
}

.intro-section,
.features-section,
.about-section,
.faq-section {
  position: relative;
  padding: 88px 0;
}

.intro-wrap {
  position: relative;
  padding: 48px;
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(246,249,255,0.94) 100%);
  border: 1px solid rgba(98, 131, 255, 0.12);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.intro-wrap::before {
  content: '';
  position: absolute;
  width: 580px;
  height: 280px;
  left: 50%;
  bottom: -160px;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(94, 130, 255, 0.28), transparent 68%);
  filter: blur(18px);
}

.intro-copy {
  position: relative;
  z-index: 1;
  text-align: left;
}

.intro-copy p {
  color: var(--muted);
  font-size: 1.04rem;
  margin-bottom: 18px;
}

.intro-board {
  position: relative;
  z-index: 1;
  margin-top: 42px;
  min-height: 490px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.board-rings {
  position: absolute;
  width: min(100%, 820px);
  aspect-ratio: 1.45 / 1;
  border-radius: 50%;
  border: 1px solid rgba(113, 144, 255, 0.14);
  box-shadow:
    inset 0 0 0 72px rgba(255,255,255,0.18),
    inset 0 0 0 144px rgba(111,142,255,0.04),
    inset 0 0 0 216px rgba(111,142,255,0.03);
}

.board-rings::before {
  content: '';
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  border: 1px solid rgba(110, 140, 255, 0.12);
}

.center-badge {
  position: absolute;
  width: 186px;
  height: 186px;
  border-radius: 50%;
  background: linear-gradient(180deg, #ffffff 0%, #f2f6ff 100%);
  box-shadow: 0 24px 54px rgba(61, 96, 210, 0.18);
  border: 1px solid rgba(110, 141, 255, 0.16);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.center-badge::before {
  content: '';
  position: absolute;
  inset: 14px;
  border-radius: 50%;
  border: 1px solid rgba(95, 127, 255, 0.12);
}

.center-badge img {
  width: 84px;
  height: auto;
  display: block;
}

.fingerprint-node {
  position: absolute;
  padding: 11px 18px;
  border-radius: 999px;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(91, 124, 255, 0.18);
  color: #4c5a79;
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(72, 102, 210, 0.08);
  z-index: 1;
  white-space: nowrap;
}

.node-1 { top: 20px; left: 70px; }
.node-2 { top: 92px; left: 188px; }
.node-3 { top: 150px; left: 52px; }
.node-4 { top: 208px; left: 152px; }
.node-5 { top: 270px; left: 44px; }
.node-6 { top: 360px; left: 106px; }
.node-7 { top: 118px; left: 298px; }
.node-8 { top: 204px; left: 300px; }
.node-9 { top: 116px; right: 228px; }
.node-10 { top: 196px; right: 248px; }
.node-11 { top: 88px; right: 108px; }
.node-12 { top: 150px; right: 132px; }
.node-13 { top: 200px; right: 28px; }
.node-14 { top: 304px; right: 122px; }
.node-15 { top: 358px; right: 28px; }

.features-section {
  background: linear-gradient(180deg, rgba(245, 248, 255, 0.7) 0%, rgba(255,255,255,0.96) 100%);
}

.features-header {
  text-align: center;
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.feature-card {
  position: relative;
  padding: 30px 28px;
  border-radius: 28px;
  background: rgba(255,255,255,0.86);
  border: 1px solid rgba(95, 126, 255, 0.12);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 52px rgba(65, 96, 204, 0.16);
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0 auto auto 0;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(103, 138, 255, 0.18), transparent 68%);
  pointer-events: none;
}

.feature-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, #79a7ff, #2f6bff);
  color: #fff;
  font-weight: 800;
  margin-bottom: 18px;
  box-shadow: 0 12px 24px rgba(47, 107, 255, 0.2);
}

.feature-title {
  font-size: 1.36rem;
  line-height: 1.3;
  margin-bottom: 12px;
}

.feature-description {
  color: var(--muted);
  font-size: 1rem;
}

.about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 28px;
  align-items: stretch;
}

.about-card,
.about-side {
  padding: 38px;
  border-radius: var(--radius-xl);
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(91, 124, 255, 0.12);
  box-shadow: var(--shadow-soft);
}

.about-copy p {
  color: var(--muted);
  font-size: 1.04rem;
  margin-top: 18px;
}

.about-stats {
  display: grid;
  gap: 18px;
}

.stat-item {
  padding: 20px 22px;
  border-radius: 22px;
  background: linear-gradient(180deg, #f7f9ff 0%, #eef3ff 100%);
  border: 1px solid rgba(91, 124, 255, 0.12);
}

.stat-value {
  font-size: 1.8rem;
  line-height: 1;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}

.stat-label {
  color: #4f5e7d;
  font-weight: 600;
}

.faq-section {
  background: linear-gradient(180deg, rgba(246, 249, 255, 0.9) 0%, rgba(255,255,255,0.98) 100%);
}

.faq-header {
  text-align: center;
  margin-bottom: 42px;
}

.faq-container {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

.accordion {
  border-radius: 24px;
  overflow: hidden;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(91, 124, 255, 0.12);
  box-shadow: 0 16px 34px rgba(65, 96, 204, 0.08);
}

.accordion-header {
  width: 100%;
  padding: 22px 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
}

.accordion-title {
  font-size: 1.04rem;
  font-weight: 700;
  color: #202949;
}

.accordion-icon {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 1.2rem;
  font-weight: 700;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--muted);
  font-size: 0.98rem;
}

.accordion-content.active {
  max-height: 240px;
  padding: 0 24px 24px;
}

.accordion.active .accordion-icon {
  transform: rotate(45deg);
  background: linear-gradient(135deg, #79a7ff, #2f6bff);
  color: #fff;
}

.footer {
  position: relative;
  padding: 34px 0 42px;
  background: #151d39;
  color: rgba(255,255,255,0.9);
  margin-top: 12px;
}

.footer-content {
  text-align: center;
}

.footer-copyright {
  font-size: 0.96rem;
  margin-bottom: 10px;
}

.footer-links {
  font-size: 0.92rem;
  color: rgba(255,255,255,0.74);
}

@media (max-width: 1100px) {
  .hero-content,
  .about-shell {
    grid-template-columns: 1fr;
  }

  .hero-text {
    max-width: none;
  }

  .hero-visual {
    min-height: 520px;
  }

  .fingerprint-node {
    font-size: 0.88rem;
  }
}

@media (max-width: 768px) {
  .container {
    width: min(100% - 28px, var(--container));
  }

  .navbar-container {
    min-height: 70px;
  }

  .nav-links {
    display: none;
  }

  .nav-cta {
    padding: 10px 16px;
    font-size: 0.92rem;
  }

  .hero-section {
    padding-top: 38px;
  }

  .hero-content {
    gap: 24px;
    min-height: auto;
  }

  .hero-title {
    font-size: 2.4rem;
  }

  .hero-subtitle {
    font-size: 1.8rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .primary-button,
  .secondary-button {
    width: 100%;
  }

  .hero-stars {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .rating-item {
    gap: 8px;
  }

  .rating-logo-only {
    height: 24px;
  }

  .stars {
    gap: 4px;
  }

  .star {
    font-size: 1.25rem;
  }

  .rating-divider {
    display: none;
  }

  .hero-visual {
    min-height: 360px;
  }

  .hero-orbit {
    width: 360px;
    height: 360px;
  }

  .hero-cards {
    max-width: 360px;
    height: 340px;
  }

  .card {
    min-width: 124px;
    padding: 12px 16px;
    font-size: 0.9rem;
    border-radius: 14px;
  }

  .card small {
    font-size: 0.72rem;
  }

  .card-1 { top: 34px; left: 58px; }
  .card-2 { top: 32px; right: 10px; }
  .card-3 { top: 120px; left: 10px; }
  .card-4 { top: 110px; right: 18px; }
  .card-5 { bottom: 48px; left: 34px; }
  .card-6 { bottom: 38px; right: 0; }

  .hero-stars {
    gap: 12px;
    font-size: 1rem;
  }

  .intro-wrap,
  .about-card,
  .about-side {
    padding: 26px 20px;
    border-radius: 24px;
  }

  .intro-board {
    min-height: 620px;
    overflow: hidden;
  }

  .board-rings {
    width: 100%;
    max-width: 420px;
    aspect-ratio: 1 / 1;
  }

  .center-badge {
    width: 150px;
    height: 150px;
  }

  .center-badge img {
    width: 68px;
  }

  .fingerprint-node {
    font-size: 0.82rem;
    padding: 9px 14px;
  }

  .node-1 { top: 8px; left: 8px; }
  .node-2 { top: 62px; left: 112px; }
  .node-3 { top: 116px; left: 0; }
  .node-4 { top: 164px; left: 88px; }
  .node-5 { top: 222px; left: 0; }
  .node-6 { top: 284px; left: 42px; }
  .node-7 { top: 82px; left: auto; right: 116px; }
  .node-8 { top: 162px; left: auto; right: 134px; }
  .node-9 { top: 46px; right: 20px; }
  .node-10 { top: 126px; right: 26px; }
  .node-11 { top: 210px; right: 4px; }
  .node-12 { top: 270px; right: 20px; }
  .node-13 { top: 330px; right: 0; }
  .node-14 { top: 390px; right: 28px; }
  .node-15 { top: 454px; right: 0; }

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

  .feature-card {
    padding: 24px 20px;
    border-radius: 22px;
  }

  .section-title {
    font-size: 2rem;
  }
}