:root {
  --bg: #f6f7fb;
  --bg-soft: #ffffff;
  --bg-alt: #eef9fc;
  --bg-dark: #0f1b3d;
  --surface: rgba(255, 255, 255, 0.84);
  --surface-strong: #ffffff;
  --text-main: #111827;
  --text-sub: #5f6b7a;
  --text-light: rgba(255, 255, 255, 0.82);
  --brand: #27c9f2;
  --brand-deep: #1fb7de;
  --accent: #ffa947;
  --border: #dde6ef;
  --shadow: 0 18px 42px rgba(20, 42, 74, 0.08);
  --shadow-soft: 0 10px 28px rgba(20, 42, 74, 0.06);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-y: scroll;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top left, rgba(39, 201, 242, 0.16), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(255, 169, 71, 0.18), transparent 22%),
    var(--bg);
}

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

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

button {
  font: inherit;
}

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

.site-shell {
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  width: 100%;
  background: rgba(246, 247, 251, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(221, 230, 239, 0.8);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid rgba(221, 230, 239, 0.95);
  box-shadow: 0 14px 24px rgba(39, 201, 242, 0.2);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-text strong {
  font-size: 20px;
  line-height: 1.1;
}

.brand-text small {
  font-size: 13px;
  color: var(--text-sub);
}

.site-menu {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-menu a {
  font-size: 15px;
  color: var(--text-sub);
  transition: color 0.2s ease;
}

.site-menu a:hover,
.site-menu a:focus-visible {
  color: var(--text-main);
}

.site-menu a.button-primary,
.site-menu a.button-primary:hover,
.site-menu a.button-primary:focus-visible {
  color: #ffffff;
}

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  border-radius: 999px;
  background: var(--text-main);
}

.hero {
  padding: 72px 0 36px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  align-items: center;
  gap: 54px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(39, 201, 242, 0.12);
  color: var(--brand-deep);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.eyebrow-light {
  background: rgba(255, 255, 255, 0.16);
  color: rgba(255, 255, 255, 0.88);
}

.hero-copy h1,
.section-heading h2,
.split-copy h2,
.cta-panel h2 {
  margin: 18px 0 0;
  font-size: clamp(38px, 5vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero-lead,
.section-heading p,
.split-copy p,
.cta-panel p {
  margin: 22px 0 0;
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-sub);
}

.hero-actions,
.cta-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 16px;
  font-weight: 700;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background-color 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #ffffff;
  box-shadow: 0 16px 28px rgba(39, 201, 242, 0.26);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.76);
  color: var(--text-main);
  border-color: var(--border);
  box-shadow: var(--shadow-soft);
}

.button-light {
  background: #ffffff;
  color: var(--bg-dark);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.16);
}

.button-outline-light {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.34);
}

.button-sm {
  min-height: 44px;
  padding-inline: 18px;
  font-size: 15px;
}

.contact-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 24px;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.contact-modal.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.contact-modal__backdrop {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: linear-gradient(180deg, rgba(15, 27, 61, 0.42), rgba(15, 27, 61, 0.58));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: opacity 0.24s ease;
}

.contact-modal.is-open .contact-modal__backdrop {
  opacity: 1;
}

.contact-modal__dialog {
  position: relative;
  z-index: 1;
  width: min(100%, 860px);
  max-height: calc(100dvh - 48px);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(221, 230, 239, 0.92);
  box-shadow: 0 26px 60px rgba(15, 27, 61, 0.22);
  overflow: auto;
  transform: translateY(20px) scale(0.96);
  transition: transform 0.24s ease;
}

.contact-modal.is-open .contact-modal__dialog {
  transform: translateY(0) scale(1);
  animation: contact-modal-pop 0.28s ease;
}

.contact-modal__close {
  position: absolute;
  top: 18px;
  right: 18px;
  z-index: 2;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.06);
  color: var(--text-main);
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}

.contact-modal__content {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 0;
}

.contact-modal__qr,
.contact-modal__info {
  padding: 36px;
}

.contact-modal__qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, rgba(39, 201, 242, 0.12), rgba(39, 201, 242, 0.03));
  border-right: 1px solid rgba(221, 230, 239, 0.92);
  text-align: center;
}

.contact-modal__qr-card {
  width: min(100%, 220px);
  margin: 0 auto 18px;
  padding: 14px;
  border-radius: 24px;
  background: #ffffff;
  box-shadow: 0 18px 36px rgba(15, 27, 61, 0.1);
}

.contact-modal__qr-card svg {
  display: block;
  width: 100%;
  height: auto;
}

.contact-modal__qr p {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.contact-modal__eyebrow {
  margin: 0;
  color: var(--brand-deep);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.contact-modal__info h3 {
  margin: 14px 0 0;
  font-size: clamp(28px, 3vw, 36px);
  line-height: 1.2;
}

.contact-modal__lead {
  margin: 16px 0 0;
  color: var(--text-sub);
  font-size: 16px;
  line-height: 1.8;
}

.contact-modal__list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.contact-modal__list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(246, 247, 251, 0.92);
  border: 1px solid rgba(221, 230, 239, 0.92);
}

.contact-modal__list span {
  color: var(--text-sub);
  font-size: 14px;
}

.contact-modal__list strong {
  color: var(--text-main);
  font-size: 16px;
  text-align: right;
}

@keyframes contact-modal-pop {
  0% {
    transform: translateY(24px) scale(0.94);
  }

  60% {
    transform: translateY(-4px) scale(1.01);
  }

  100% {
    transform: translateY(0) scale(1);
  }
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border: 0;
  border-radius: 999px;
  appearance: none;
  -webkit-appearance: none;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #ffffff;
  box-shadow: 0 16px 28px rgba(39, 201, 242, 0.3);
  cursor: pointer;
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity 0.2s ease,
    visibility 0.2s ease,
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  box-shadow: 0 18px 30px rgba(39, 201, 242, 0.36);
  transform: translateY(-2px);
}

.back-to-top:focus-visible {
  outline: 3px solid rgba(39, 201, 242, 0.24);
  outline-offset: 3px;
}

.hero-points {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.hero-points li {
  position: relative;
  padding-left: 28px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-sub);
}

.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
}

.hero-visual {
  position: relative;
  min-height: 560px;
}

.hero-card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px);
}

.hero-card-main {
  padding: 18px;
}

.hero-card-main img {
  width: 100%;
  border-radius: 24px;
}

.hero-card-float {
  position: absolute;
  padding: 16px;
}

.hero-card-left {
  left: -24px;
  bottom: 42px;
}

.hero-card-right {
  right: -16px;
  top: 48px;
}

.stat-chip {
  display: grid;
  gap: 6px;
}

.stat-chip strong {
  font-size: 18px;
}

.stat-chip span {
  max-width: 190px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-sub);
}

.stat-chip.accent strong {
  color: var(--brand-deep);
}

.stats {
  padding: 18px 0 28px;
}

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

.stat-block,
.feature-card,
.science-card,
.scene-card,
.faq-item,
.media-card {
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(221, 230, 239, 0.9);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(14px);
}

.stat-block {
  padding: 24px;
}

.stat-block strong {
  display: block;
  font-size: 34px;
  line-height: 1;
  color: var(--brand-deep);
}

.stat-block span {
  display: block;
  margin-top: 10px;
  font-size: 17px;
  font-weight: 700;
}

.stat-block p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-sub);
}

.section {
  padding: 88px 0;
}

.section-alt {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.28)),
    var(--bg-alt);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 38px;
}

.section-heading h2 {
  font-size: clamp(32px, 4.2vw, 48px);
}

.section-heading p {
  margin-top: 18px;
}

.feature-grid,
.science-grid,
.scene-grid {
  display: grid;
  gap: 18px;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.science-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.feature-card,
.science-card,
.scene-card {
  padding: 28px;
}

.icon-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  height: 48px;
  padding: 0 14px;
  border-radius: 999px;
  background: rgba(39, 201, 242, 0.12);
  color: var(--brand-deep);
  font-weight: 800;
  font-size: 14px;
}

.feature-card h3,
.science-card h3,
.scene-card h3,
.faq-item summary {
  margin: 16px 0 0;
  font-size: 22px;
  line-height: 1.35;
}

.feature-card p,
.science-card p,
.scene-card p,
.faq-item p {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-sub);
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.96fr) minmax(0, 1.04fr);
  align-items: center;
  gap: 42px;
}

.media-card {
  padding: 18px;
}

.media-card img {
  border-radius: 22px;
  width: 100%;
}

.split-copy h2 {
  font-size: clamp(30px, 4vw, 46px);
}

.check-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.check-list li {
  position: relative;
  padding: 16px 18px 16px 56px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(221, 230, 239, 0.9);
  font-size: 16px;
  line-height: 1.7;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 18px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: rgba(39, 201, 242, 0.14);
  color: var(--brand-deep);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
}

.quote-panel {
  margin-top: 22px;
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #0f1b3d 0%, #1d315f 100%);
  box-shadow: var(--shadow);
}

.quote-panel p {
  margin: 0;
  font-size: 20px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.92);
}

.faq-list {
  display: grid;
  gap: 16px;
}

.faq-item {
  padding: 0 24px;
  overflow: hidden;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 24px 36px 24px 0;
  position: relative;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 20px;
  font-size: 28px;
  line-height: 1;
  color: var(--brand-deep);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin: 0 0 24px;
  padding-top: 2px;
}

.cta-section {
  padding-top: 60px;
}

.cta-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 40px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #0f1b3d 0%, #22417c 68%, #27c9f2 140%);
  box-shadow: 0 22px 48px rgba(15, 27, 61, 0.2);
}

.cta-panel h2,
.cta-panel p {
  color: #ffffff;
}

.cta-panel p {
  color: var(--text-light);
}

.site-footer {
  padding: 28px 0 40px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--text-sub);
  font-size: 14px;
}

.footer-inner strong {
  display: block;
  color: var(--text-main);
  margin-bottom: 6px;
  font-size: 16px;
}

@media (max-width: 1080px) {
  .hero-grid,
  .split-layout,
  .cta-panel,
  .feature-grid,
  .science-grid,
  .scene-grid,
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cta-panel {
    align-items: start;
  }

  .hero-visual {
    min-height: 460px;
  }
}

@media (max-width: 820px) {
  .nav {
    min-height: 74px;
  }

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

  .site-menu {
    position: absolute;
    left: 20px;
    right: 20px;
    top: calc(100% + 10px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 16px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .site-menu.is-open {
    display: flex;
  }

  .hero,
  .section {
    padding: 64px 0;
  }

  .contact-modal {
    padding: 16px;
  }

  .contact-modal__dialog {
    width: 100%;
    max-height: calc(100dvh - 32px);
    border-radius: 24px;
  }

  .contact-modal__content {
    grid-template-columns: 1fr;
  }

  .contact-modal__qr {
    border-right: 0;
    border-bottom: 1px solid rgba(221, 230, 239, 0.92);
  }

  .hero-grid,
  .split-layout,
  .cta-panel,
  .feature-grid,
  .science-grid,
  .scene-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy h1,
  .section-heading h2,
  .split-copy h2,
  .cta-panel h2 {
    font-size: clamp(32px, 10vw, 46px);
  }

  .hero-visual {
    min-height: auto;
    padding-top: 8px;
  }

  .hero-card-float {
    position: static;
    margin-top: 14px;
  }

  .cta-actions {
    width: 100%;
  }

  .cta-actions .button {
    width: 100%;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 48px;
    height: 48px;
    font-size: 20px;
  }

  .contact-modal__qr,
  .contact-modal__info {
    padding: 24px;
  }

  .contact-modal__dialog {
    max-height: calc(100dvh - 20px);
    border-radius: 20px;
  }

  .contact-modal__close {
    top: 12px;
    right: 12px;
  }

  .contact-modal__info h3 {
    font-size: 28px;
    padding-right: 36px;
  }

  .contact-modal__list li {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-modal__list strong {
    text-align: left;
  }

  .brand-text strong {
    font-size: 18px;
  }

  .brand-text small {
    font-size: 12px;
  }

  .hero-copy h1,
  .section-heading h2,
  .split-copy h2,
  .cta-panel h2 {
    letter-spacing: -0.02em;
  }

  .stat-block,
  .feature-card,
  .science-card,
  .scene-card,
  .cta-panel,
  .faq-item,
  .media-card {
    border-radius: 20px;
  }

  .feature-card,
  .science-card,
  .scene-card,
  .stat-block,
  .cta-panel {
    padding: 22px;
  }

  .faq-item {
    padding: 0 18px;
  }

  .faq-item summary {
    font-size: 20px;
    padding-right: 28px;
  }
}