:root {
  --bg: #efe6d8;
  --bg-soft: #faf4ea;
  --bg-deep: #083a46;
  --card: rgba(255, 251, 244, 0.82);
  --card-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(8, 58, 70, 0.16);
  --ink: #102123;
  --muted: #55686a;
  --brand: #0d6670;
  --brand-deep: #083c48;
  --accent: #d97941;
  --accent-soft: #ffe1c5;
  --shadow: 0 28px 70px rgba(10, 30, 34, 0.14);
  --radius-lg: 28px;
  --radius-md: 22px;
  --radius-sm: 14px;
  --container: min(1180px, calc(100vw - 40px));
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(217, 121, 65, 0.18), transparent 34%),
    radial-gradient(circle at 90% 0%, rgba(13, 102, 112, 0.18), transparent 28%),
    linear-gradient(180deg, #f6efe4 0%, var(--bg) 35%, #f9f5ee 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(8, 58, 70, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 58, 70, 0.035) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at center, black 45%, transparent 90%);
  pointer-events: none;
  z-index: -1;
}

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

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

button,
input,
textarea {
  font: inherit;
}

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

.container {
  width: var(--container);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(249, 243, 232, 0.72);
  border-bottom: 1px solid rgba(8, 58, 70, 0.08);
}

.site-header.is-scrolled {
  box-shadow: 0 16px 36px rgba(10, 30, 34, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 84px;
}

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

.brand img {
  width: 54px;
  height: 54px;
}

.brand span {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand strong,
.brand em {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand strong {
  font-family: "Source Han Serif SC", "Songti SC", "STSong", serif;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
}

.brand em {
  font-style: normal;
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.site-nav a {
  padding: 11px 16px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.95rem;
  transition: 0.25s ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--brand-deep);
  background: rgba(13, 102, 112, 0.1);
}

.menu-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(8, 58, 70, 0.12);
  background: rgba(255, 255, 255, 0.72);
  border-radius: 14px;
  padding: 0;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
  border-radius: 999px;
  transition: 0.2s ease;
}

.hero,
.page-hero {
  position: relative;
  overflow: hidden;
}

.hero::after,
.page-hero::after {
  content: "";
  position: absolute;
  inset: auto auto -120px -60px;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(13, 102, 112, 0.18), transparent 68%);
  pointer-events: none;
}

.hero {
  padding: 72px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 36px;
  align-items: center;
}

.hero-copy h1,
.page-hero-inner h1,
.section-heading h2,
.hero-card h2,
.cta-block h2 {
  font-family: "Source Han Serif SC", "Songti SC", "STSong", serif;
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.hero-copy h1 {
  font-size: clamp(2.3rem, 4vw, 4.7rem);
  margin: 0 0 18px;
  max-width: 11em;
}

.lead {
  font-size: 1.07rem;
  line-height: 1.9;
  color: var(--muted);
  max-width: 42rem;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
}

.hero-actions,
.cta-block {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-actions {
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(8, 58, 70, 0.14);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.button-primary {
  background: linear-gradient(135deg, var(--brand) 0%, #127f82 100%);
  color: #fff;
}

.button-secondary,
.button-ghost {
  background: rgba(255, 255, 255, 0.62);
  border-color: rgba(8, 58, 70, 0.12);
  color: var(--brand-deep);
}

.hero-points {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-points li,
.check-card li {
  position: relative;
}

.hero-points li {
  padding: 10px 14px 10px 34px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(8, 58, 70, 0.08);
  border-radius: 999px;
  color: var(--muted);
}

.hero-points li::before,
.check-card li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--brand) 100%);
  transform: translateY(-50%);
}

.hero-panel {
  position: relative;
}

.hero-card,
.info-card,
.solution-card,
.download-card,
.check-card,
.timeline-item,
.contact-panel,
.contact-form-card,
.mini-card,
.use-case,
.faq-item,
.expansion-item {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero-card {
  padding: 30px;
  border-radius: 30px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92) 0%, rgba(243, 252, 251, 0.88) 100%);
}

.panel-label,
.download-type {
  margin: 0 0 14px;
  color: var(--brand);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-card h2 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 2.4vw, 2.5rem);
}

.hero-card p {
  margin: 0;
  line-height: 1.85;
  color: var(--muted);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.hero-metrics article {
  padding: 18px 16px;
  border-radius: 20px;
  background: rgba(8, 58, 70, 0.06);
}

.hero-metrics strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.7rem;
  font-family: "Source Han Serif SC", "Songti SC", "STSong", serif;
  color: var(--brand-deep);
}

.hero-metrics span {
  color: var(--muted);
  font-size: 0.92rem;
}

.section {
  padding: 34px 0 82px;
}

.section-heading {
  max-width: 56rem;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 3rem);
}

.section-dark {
  background:
    radial-gradient(circle at top right, rgba(217, 121, 65, 0.12), transparent 30%),
    linear-gradient(180deg, rgba(8, 58, 70, 0.98) 0%, rgba(9, 47, 58, 0.98) 100%);
  color: #eff8f8;
}

.section-dark .section-heading h2,
.section-dark h3,
.section-dark p,
.section-dark span {
  color: inherit;
}

.section-accent {
  padding-top: 12px;
}

.card-grid {
  display: grid;
  gap: 22px;
}

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

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

.info-card,
.solution-card,
.check-card,
.mini-card,
.use-case,
.faq-item,
.expansion-item {
  padding: 26px;
  border-radius: var(--radius-lg);
}

.info-card h3,
.solution-card h3,
.download-card h3,
.check-card h3,
.timeline-item h3,
.mini-card h3,
.use-case h3,
.faq-item h3,
.expansion-item h3 {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.info-card p,
.solution-card p,
.download-card p,
.check-card p,
.timeline-item p,
.contact-panel p,
.contact-form-card p,
.mini-card p,
.use-case p,
.faq-item p,
.expansion-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.section-dark .feature-item p,
.section-dark .timeline-item p,
.section-dark .release-row {
  color: rgba(239, 248, 248, 0.82);
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 32px;
  align-items: start;
}

.feature-list,
.stack-cards,
.expansion-list {
  display: grid;
  gap: 18px;
}

.feature-item {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(239, 248, 248, 0.14);
}

.feature-item:last-child {
  border-bottom: 0;
}

.feature-item span,
.timeline-item span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 18px;
  font-family: "Source Han Serif SC", "Songti SC", "STSong", serif;
  color: #fff;
  background: linear-gradient(135deg, rgba(217, 121, 65, 0.92), rgba(13, 102, 112, 0.9));
}

.download-preview,
.download-center,
.faq-grid,
.use-case-grid,
.mini-grid {
  display: grid;
  gap: 22px;
}

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

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

.download-card {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 22px;
  padding: 26px;
  border-radius: var(--radius-lg);
}

.download-card.large {
  min-height: 220px;
}

.download-card .button {
  flex-shrink: 0;
}

.cta-block {
  justify-content: space-between;
  padding: 34px;
  border-radius: 32px;
  background:
    linear-gradient(135deg, rgba(255, 229, 205, 0.92) 0%, rgba(255, 247, 238, 0.92) 100%);
  border: 1px solid rgba(217, 121, 65, 0.18);
  box-shadow: var(--shadow);
}

.cta-block h2 {
  margin: 0;
  font-size: clamp(1.6rem, 2.6vw, 2.4rem);
}

.page-hero {
  padding: 52px 0 10px;
}

.page-hero-inner {
  max-width: 56rem;
  padding: 36px 0 26px;
}

.page-hero-inner h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 3.5vw, 4rem);
}

.page-hero-inner p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.85;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.timeline-item {
  padding: 26px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: none;
}

.timeline-item span {
  margin-bottom: 18px;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.check-card ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.check-card li {
  padding-left: 34px;
  color: var(--muted);
  line-height: 1.7;
}

.release-table {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.release-row {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1fr;
  gap: 16px;
  padding: 18px 22px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.release-row:last-child {
  border-bottom: 0;
}

.release-head {
  background: rgba(255, 255, 255, 0.1);
  font-weight: 700;
  color: #fff;
}

.faq-grid,
.use-case-grid,
.mini-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 24px;
}

.contact-panel,
.contact-form-card {
  padding: 28px;
  border-radius: 30px;
}

.contact-list {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.contact-list article {
  padding: 18px 20px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(8, 58, 70, 0.08);
}

.contact-list span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.contact-list strong a {
  color: var(--brand);
}

.contact-form {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.contact-form label {
  display: grid;
  gap: 8px;
}

.contact-form span {
  font-weight: 600;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(8, 58, 70, 0.14);
  border-radius: 18px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--ink);
}

.contact-form textarea {
  resize: vertical;
  min-height: 130px;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: 2px solid rgba(13, 102, 112, 0.22);
  border-color: rgba(13, 102, 112, 0.32);
}

.form-hint,
.form-feedback {
  color: var(--muted);
  font-size: 0.92rem;
}

.form-feedback.is-success {
  color: var(--brand-deep);
}

.site-footer {
  padding: 14px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(180px, 0.7fr) minmax(220px, 0.8fr);
  gap: 24px;
  padding: 28px 30px;
  border-radius: 32px;
  background: rgba(255, 250, 244, 0.78);
  border: 1px solid rgba(8, 58, 70, 0.08);
  box-shadow: 0 18px 42px rgba(10, 30, 34, 0.08);
}

.brand-footer img {
  width: 44px;
  height: 44px;
}

.footer-note,
.footer-meta p {
  color: var(--muted);
  line-height: 1.75;
}

.footer-links {
  display: grid;
  gap: 12px;
}

.footer-links a {
  color: var(--muted);
}

.footer-links a:hover,
.footer-meta a:hover {
  color: var(--brand);
}

.not-found-shell {
  display: grid;
  place-items: center;
}

.not-found-page {
  width: 100%;
  padding: 48px 20px;
}

.not-found-card {
  width: min(680px, 100%);
  margin: 0 auto;
  padding: 44px;
  border-radius: 34px;
  background: rgba(255, 251, 244, 0.88);
  border: 1px solid rgba(8, 58, 70, 0.1);
  box-shadow: var(--shadow);
  text-align: center;
}

.not-found-card img {
  width: 76px;
  height: 76px;
  margin: 0 auto 20px;
}

.not-found-card h1 {
  margin: 0 0 12px;
  font-family: "Source Han Serif SC", "Songti SC", "STSong", serif;
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

@media (max-width: 1024px) {
  .hero-grid,
  .split-layout,
  .contact-layout,
  .footer-grid,
  .download-center,
  .card-grid-2,
  .card-grid-3,
  .timeline,
  .check-grid,
  .faq-grid,
  .use-case-grid,
  .mini-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    padding: 24px;
  }
}

@media (max-width: 820px) {
  .header-inner {
    min-height: 76px;
  }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 20px;
    right: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 14px;
    border-radius: 22px;
    background: rgba(255, 251, 244, 0.94);
    border: 1px solid rgba(8, 58, 70, 0.1);
    box-shadow: 0 18px 48px rgba(10, 30, 34, 0.12);
  }

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

  .site-nav a {
    padding: 14px 16px;
  }

  .hero {
    padding-top: 48px;
  }

  .hero-copy h1 {
    max-width: 100%;
  }

  .hero-card,
  .download-card,
  .contact-panel,
  .contact-form-card,
  .not-found-card {
    padding: 24px;
  }

  .download-card {
    flex-direction: column;
  }

  .cta-block {
    padding: 28px;
  }
}

@media (max-width: 560px) {
  :root {
    --container: min(100vw - 28px, 100vw - 28px);
  }

  body {
    font-size: 15px;
  }

  .brand strong {
    font-size: 0.98rem;
  }

  .brand em {
    font-size: 0.72rem;
  }

  .hero-copy h1 {
    font-size: 2.2rem;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

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

  .release-head {
    display: none;
  }

  .site-footer {
    padding-bottom: 22px;
  }
}