:root {
  color-scheme: light;
  --surface-primary: #faf7f2;
  --surface-secondary: #f5f5dc;
  --foreground-primary: #1a1a1a;
  --foreground-secondary: #4b5563;
  --foreground-inverse: #ffffff;
  --accent-primary: #72d350;
  --accent-secondary: #fff000;
  --accent-tertiary: #7c3aed;
  --accent-primary-dark: #5bc43f;
  --product-soft: #eafbe3;
  --product-note: #d4f5c8;
  --dialogue-agent: #eefad9;
  --footer-bg: #1a1a1a;
  --footer-muted: #cccccc;
  --section-x: clamp(24px, 8vw, 100px);
  --section-y: clamp(48px, 6vw, 64px);
  --font-heading: "Funnel Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: Inter, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--foreground-primary);
  background: var(--surface-primary);
  font-family: var(--font-body);
  line-height: 1.55;
}

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

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

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: 9999px;
  background: var(--foreground-primary);
  color: var(--foreground-inverse);
  font-weight: 600;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px var(--section-x);
  background: var(--surface-primary);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  display: block;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 10px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-cn {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-en {
  color: var(--foreground-secondary);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.2;
}

.menu-toggle {
  display: none;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  margin: 0 auto;
  background: var(--foreground-primary);
  content: "";
}

.menu-icon {
  position: relative;
}

.menu-icon::before {
  position: absolute;
  top: -7px;
  left: 0;
}

.menu-icon::after {
  position: absolute;
  top: 7px;
  left: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 32px);
  font-size: 15px;
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent-primary-dark);
}

.ribbon-section {
  width: 100%;
}

.section-inner {
  padding: var(--section-y) var(--section-x);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-primary-dark);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.eyebrow-inverse {
  color: var(--accent-secondary);
}

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

h1,
h2,
h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
}

h1 {
  margin-bottom: 12px;
  font-size: clamp(38px, 7vw, 72px);
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(28px, 4vw, 48px);
}

h3 {
  margin-bottom: 10px;
  font-size: clamp(20px, 2.2vw, 22px);
}

.lead,
.section-desc,
.product-lead {
  max-width: 52rem;
  color: var(--foreground-secondary);
  font-size: clamp(16px, 1.6vw, 18px);
}

.company-en {
  margin-bottom: 16px;
  color: var(--foreground-secondary);
  font-size: clamp(14px, 1.4vw, 16px);
  font-weight: 500;
}

.opening-section {
  background: var(--surface-primary);
}

.opening-section .section-inner {
  padding-top: 0;
}

.illustration-frame {
  margin: 0 0 20px;
  overflow: hidden;
}

.opening-illustration {
  width: 100%;
  height: clamp(200px, 32vw, 320px);
}

.opening-illustration img,
.hero-illustration img,
.product-illustration img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.primary-section {
  background: var(--accent-primary);
  color: var(--foreground-inverse);
}

.primary-inner {
  display: grid;
  grid-template-columns: minmax(240px, 0.9fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 32px);
  align-items: center;
  padding: var(--section-y) var(--section-x);
}

.hero-illustration {
  width: min(360px, 100%);
  height: clamp(240px, 36vw, 360px);
  justify-self: center;
}

.primary-copy {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
  text-align: center;
}

.primary-copy h2 {
  margin-bottom: 0;
  max-width: 14em;
  color: var(--foreground-inverse);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 9999px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
}

.button-solid {
  background: var(--foreground-primary);
  color: var(--foreground-inverse);
}

.button-ghost {
  border: 1px solid var(--foreground-inverse);
  color: var(--foreground-inverse);
}

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

.stats-section {
  background: var(--accent-secondary);
}

.stats-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  margin: 0;
  padding: 28px var(--section-x);
  list-style: none;
}

.stats-list li {
  font-family: var(--font-heading);
  font-size: clamp(18px, 2vw, 20px);
  font-weight: 700;
}

.ribbon-zone {
  background: var(--surface-secondary);
}

.ribbon-scene {
  position: relative;
  margin: 0;
  overflow: hidden;
  min-height: clamp(360px, 50vw, 480px);
}

.ribbon-scene img {
  width: 100%;
  height: clamp(360px, 50vw, 480px);
  object-fit: cover;
  object-position: center;
}

.ribbon-band {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: 16px 24px;
  background: var(--accent-secondary);
}

.ribbon-band p {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 700;
  text-align: center;
}

.capabilities-section {
  background: var(--surface-primary);
}

.about-section {
  background: var(--surface-secondary);
}

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

.capability-item {
  padding: 28px 24px;
  background: var(--surface-primary);
}

.capability-index {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--accent-primary-dark);
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 800;
}

.capability-item p {
  margin-bottom: 0;
  color: var(--foreground-secondary);
  font-size: 16px;
}

.product-section {
  background: var(--accent-primary);
  color: var(--foreground-inverse);
}

.product-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.95fr);
  gap: clamp(24px, 4vw, 32px);
  align-items: start;
  padding: var(--section-y) var(--section-x);
}

.product-copy h2 {
  color: var(--foreground-inverse);
}

.product-lead {
  color: var(--product-soft);
}

.feature-list {
  display: grid;
  gap: 8px;
  margin: 16px 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  font-size: 15px;
}

.product-note {
  margin-bottom: 0;
  color: var(--product-note);
  font-size: 14px;
  font-weight: 500;
}

.app-download {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.28);
}

.app-store-badge {
  width: 156px;
  height: auto;
}

.app-download-qr {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  margin: 0;
}

.app-download-qr img {
  width: 120px;
  height: 120px;
  padding: 8px;
  background: var(--foreground-inverse);
}

.app-download-qr figcaption {
  color: var(--product-soft);
  font-size: 14px;
  font-weight: 500;
}

.product-visual {
  display: grid;
  gap: 16px;
}

.product-illustration {
  width: 100%;
  height: clamp(180px, 28vw, 220px);
}

.dialogue-panel {
  display: grid;
  gap: 12px;
  padding: 16px;
  background: var(--accent-primary-dark);
}

.dialogue-msg {
  padding: 14px 16px;
  background: var(--surface-secondary);
  color: var(--foreground-primary);
}

.dialogue-msg-agent {
  background: var(--dialogue-agent);
}

.dialogue-role {
  display: block;
  margin-bottom: 6px;
  color: var(--accent-primary-dark);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
}

.dialogue-msg p {
  margin: 0;
  font-size: 15px;
  line-height: 1.45;
}

.contact-section {
  background: var(--surface-primary);
}

.contact-list {
  display: grid;
  gap: 16px;
  max-width: 36rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-list li {
  display: grid;
  gap: 4px;
}

.contact-label {
  color: var(--foreground-secondary);
  font-size: 14px;
  font-weight: 600;
}

.contact-list a {
  color: var(--foreground-primary);
  font-size: clamp(16px, 1.6vw, 18px);
  font-weight: 500;
  word-break: break-all;
}

.contact-list a:hover,
.contact-list a:focus-visible {
  color: var(--accent-primary-dark);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  padding: 28px var(--section-x);
  background: var(--footer-bg);
  color: var(--footer-muted);
  font-size: 14px;
}

.site-footer a {
  border-bottom: 1px solid rgba(204, 204, 204, 0.5);
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--foreground-inverse);
}

@media (max-width: 900px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: var(--section-x);
    left: var(--section-x);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    background: var(--surface-primary);
    box-shadow: 0 12px 32px rgba(26, 26, 26, 0.08);
  }

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

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

  .site-header {
    position: sticky;
    flex-wrap: wrap;
  }

  .primary-inner,
  .product-inner,
  .capability-grid {
    grid-template-columns: 1fr;
  }

  .primary-copy,
  .cta-row {
    align-items: stretch;
    text-align: left;
  }

  .primary-copy {
    align-items: flex-start;
  }

  .cta-row {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .stats-list {
    flex-direction: column;
  }

  .ribbon-band {
    position: static;
  }

  .ribbon-scene {
    display: flex;
    flex-direction: column;
    min-height: auto;
  }

  .ribbon-scene img {
    height: clamp(220px, 55vw, 320px);
  }

  .brand-en {
    display: none;
  }

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

  .app-download {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 620px) {
  .site-header {
    padding-top: 16px;
    padding-bottom: 16px;
  }
}