:root {
  --color-ink: #1a2e28;
  --color-ink-soft: #3d534c;
  --color-muted: #6a7f77;
  --color-paper: #f3f7f4;
  --color-paper-warm: #eef5f1;
  --color-white: #ffffff;
  --color-brand: #1a5f4a;
  --color-brand-deep: #0f3d30;
  --color-brand-soft: #a8d5c4;
  --color-accent: #c45c26;
  --color-accent-soft: #f0d2c0;
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --shadow-soft: 0 18px 50px rgba(15, 61, 48, 0.12);
  --radius: 18px;
  --container: 1100px;
  --header-h: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(168, 213, 196, 0.45), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(196, 92, 38, 0.12), transparent 50%),
    linear-gradient(180deg, var(--color-paper) 0%, var(--color-paper-warm) 40%, #e7f0eb 100%);
  line-height: 1.65;
  min-height: 100vh;
}

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

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-brand);
  color: var(--color-white);
  padding: 0.6rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(243, 247, 244, 0.82);
  border-bottom: 1px solid rgba(26, 95, 74, 0.08);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark img {
  border-radius: 8px;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  background: var(--color-brand);
  color: var(--color-white);
  font-size: 0.92rem;
  font-weight: 500;
  transition: background 0.2s ease, transform 0.2s ease;
}

.header-cta:hover {
  background: var(--color-brand-deep);
  transform: translateY(-1px);
}

/* Hero */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: center;
  padding: 3.5rem 0 4.5rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(26, 95, 74, 0.08), transparent 45%),
    radial-gradient(ellipse 80% 60% at 70% 40%, rgba(168, 213, 196, 0.35), transparent 70%),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 28px,
      rgba(26, 95, 74, 0.025) 28px,
      rgba(26, 95, 74, 0.025) 29px
    );
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-eyebrow {
  margin: 0 0 0.75rem;
  color: var(--color-accent);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.brand-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--color-brand-deep);
}

.hero-lead {
  margin: 1.1rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-ink);
}

.hero-support {
  margin: 1.25rem 0 0;
  max-width: 34rem;
  color: var(--color-ink-soft);
  font-size: 1.05rem;
}

.hero-actions {
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-brand) 0%, var(--color-brand-deep) 100%);
  color: var(--color-white);
  box-shadow: 0 10px 28px rgba(26, 95, 74, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(26, 95, 74, 0.34);
}

/* Hero visual */
.hero-visual {
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.visual-plane {
  position: relative;
  width: min(100%, 420px);
  aspect-ratio: 4 / 3;
}

.visual-glow {
  position: absolute;
  inset: 8% 5%;
  background: radial-gradient(circle at 40% 40%, rgba(168, 213, 196, 0.7), rgba(196, 92, 38, 0.15) 55%, transparent 70%);
  filter: blur(8px);
}

.visual-sheet {
  position: absolute;
  border-radius: 16px;
  box-shadow: var(--shadow-soft);
}

.visual-sheet-a {
  inset: 18% 8% 12% 22%;
  background: linear-gradient(160deg, #d8ebe3, #b7d8c9);
  transform: rotate(-8deg);
}

.visual-sheet-b {
  inset: 12% 14% 18% 10%;
  background: linear-gradient(150deg, #fff8f3, #f0d2c0);
  transform: rotate(6deg);
}

.visual-sheet-c {
  inset: 10% 16% 16% 16%;
  background: linear-gradient(165deg, #ffffff 0%, #f4faf7 100%);
  border: 1px solid rgba(26, 95, 74, 0.1);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  justify-content: center;
}

.visual-line {
  display: block;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(26, 95, 74, 0.35), rgba(26, 95, 74, 0.08));
}

.visual-line.short {
  width: 55%;
}

.visual-line.mid {
  width: 72%;
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section-head {
  max-width: 36rem;
  margin-bottom: 2.5rem;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  color: var(--color-brand-deep);
  letter-spacing: 0.03em;
}

.section-head p {
  margin: 0.75rem 0 0;
  color: var(--color-ink-soft);
  font-size: 1.05rem;
}

/* Values — not card-wall: open list with separators */
.values {
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.45) 20%, rgba(255, 255, 255, 0.45) 80%, transparent);
}

.value-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.value-list li {
  padding: 0 1.75rem;
  border-left: 1px solid rgba(26, 95, 74, 0.15);
}

.value-list li:first-child {
  padding-left: 0;
  border-left: none;
}

.value-list h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  color: var(--color-brand);
  letter-spacing: 0.08em;
}

.value-list p {
  margin: 0.85rem 0 0;
  color: var(--color-ink-soft);
}

/* Coverage */
.coverage-body {
  text-align: center;
  padding: 2.5rem 1rem;
  background:
    radial-gradient(ellipse at center, rgba(168, 213, 196, 0.35), transparent 65%),
    linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
}

.coverage-stages {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.8vw, 2rem);
  font-weight: 700;
  color: var(--color-brand-deep);
  letter-spacing: 0.08em;
  line-height: 1.7;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.15em 0.35em;
}

.coverage-stages span[aria-hidden="true"] {
  margin: 0 0.35em;
  color: var(--color-accent);
  letter-spacing: 0;
}

.coverage-subjects {
  margin: 1.25rem 0 0;
  color: var(--color-ink-soft);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
}

/* Scan */
.scan {
  padding-bottom: 6rem;
}

.scan-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.scan-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  color: var(--color-brand-deep);
}

.scan-copy > p {
  margin: 1rem 0 0;
  color: var(--color-ink-soft);
  max-width: 32rem;
}

.scan-steps {
  margin: 1.75rem 0 0;
  padding-left: 1.2rem;
  color: var(--color-ink);
}

.scan-steps li {
  margin-bottom: 0.55rem;
}

.scan-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.qr-frame {
  padding: 1.1rem;
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(26, 95, 74, 0.1);
  animation: qr-breathe 3.2s ease-in-out infinite;
}

.qr-frame img {
  width: 240px;
  height: 240px;
  object-fit: contain;
}

.scan-figure figcaption {
  color: var(--color-muted);
  font-size: 0.95rem;
}

@keyframes qr-breathe {
  0%,
  100% {
    transform: scale(1);
    box-shadow: var(--shadow-soft);
  }
  50% {
    transform: scale(1.02);
    box-shadow: 0 22px 56px rgba(15, 61, 48, 0.16);
  }
}

/* Footer */
.site-footer {
  border-top: 1px solid rgba(26, 95, 74, 0.1);
  background: rgba(15, 61, 48, 0.94);
  color: rgba(255, 255, 255, 0.82);
  padding: 2.5rem 0;
}

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

.footer-brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-white);
  letter-spacing: 0.06em;
}

.footer-desc,
.footer-copy,
.footer-beian {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
}

.footer-beian a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-decoration: none;
}

.footer-beian a:hover {
  color: var(--color-brand-soft);
}

.footer-beian-gongan img {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

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

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay {
  transition-delay: 0.12s;
}

.reveal-delay-2 {
  transition-delay: 0.24s;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .qr-frame {
    animation: none;
  }
}

/* Responsive */
@media (max-width: 860px) {
  .hero {
    min-height: auto;
    padding: 2.5rem 0 3.5rem;
  }

  .hero-grid,
  .scan-grid {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .hero-visual {
    order: -1;
    min-height: 240px;
  }

  .visual-plane {
    width: min(100%, 340px);
  }

  .value-list {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .value-list li {
    padding: 0;
    border-left: none;
    border-top: 1px solid rgba(26, 95, 74, 0.12);
    padding-top: 1.5rem;
  }

  .value-list li:first-child {
    border-top: none;
    padding-top: 0;
  }

  .qr-frame img {
    width: min(72vw, 260px);
    height: min(72vw, 260px);
  }

  .section {
    padding: 3.5rem 0;
  }

  .coverage-stages {
    letter-spacing: 0.1em;
  }
}

@media (max-width: 480px) {
  .brand-mark span {
    font-size: 0.95rem;
  }

  .hero-support {
    font-size: 0.98rem;
  }

  .btn-primary {
    width: 100%;
  }
}