:root {
  --ink: #2a211c;
  --ink-soft: #6d5648;
  --paper: #fffaf4;
  --paper-2: #fff3e4;
  --line: #f0dcc8;
  --tiger: #f08a2a;
  --tiger-deep: #e06a18;
  --cape: #e23b3b;
  --cream: #fff7ee;
  --shadow: 0 18px 40px rgb(92 48 18 / 10%);
  --header: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header) + 12px); }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 88% -8%, #ffe0b8 0%, transparent 62%),
    radial-gradient(640px 320px at -8% 18%, #ffd6d0 0%, transparent 60%),
    var(--paper);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}
::selection { background: #ffd7a8; color: var(--ink); }
h1, h2, h3, h4, p, figure, dl, dd, ul { margin: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--cape);
  outline-offset: 3px;
}
.container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.icon { display: block; width: 22px; height: 22px; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.download-link .icon { fill: currentColor; stroke: none; width: 20px; height: 20px; }

.skip-link {
  position: fixed; z-index: 80; top: 8px; left: 8px;
  padding: 10px 16px; color: #fff; background: var(--ink); border-radius: 8px;
  transform: translateY(-160%);
}
.skip-link:focus { transform: none; }

.site-header {
  position: sticky; z-index: 40; top: 0;
  background: rgb(255 250 244 / 88%);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgb(240 220 200 / 80%);
}
.navigation { min-height: var(--header); display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand img { height: 52px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 28px; color: var(--ink-soft); font-size: 15px; font-weight: 600; }
.nav-links a:hover { color: var(--tiger-deep); }
.nav-download {
  padding: 8px 16px; border-radius: 999px; color: #fff !important;
  background: linear-gradient(180deg, var(--tiger), var(--tiger-deep));
  box-shadow: 0 8px 16px rgb(224 106 24 / 28%);
}

.hero { padding: 28px 0 8px; }
.hero-layout { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 12px; }
.hero-kicker {
  display: inline-flex; margin-bottom: 14px; padding: 6px 12px;
  border-radius: 999px; background: #fff; color: var(--tiger-deep);
  font-size: 13px; font-weight: 700; letter-spacing: .02em;
  box-shadow: inset 0 0 0 1px var(--line);
}
.hero h1 { font-size: clamp(40px, 5vw, 64px); line-height: 1.12; font-weight: 800; letter-spacing: -0.03em; }
.hero h1 span { color: var(--tiger-deep); }
.hero-description { max-width: 34em; margin-top: 18px; color: var(--ink-soft); font-size: 17px; }
.hero-proof { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; padding: 0; list-style: none; }
.hero-proof li {
  padding: 6px 10px; border-radius: 8px; background: #fff;
  color: var(--ink-soft); font-size: 13px; font-weight: 650;
  box-shadow: inset 0 0 0 1px var(--line);
}

.downloads { display: grid; grid-template-columns: repeat(2, minmax(0, 268px)); gap: 12px; margin-top: 28px; }
.download-link {
  display: flex; align-items: center; gap: 10px; min-height: 52px; padding: 12px 16px;
  border-radius: 14px; color: #fff; font-size: 15px; font-weight: 700;
  background: linear-gradient(180deg, #f59a3c, var(--tiger-deep));
  box-shadow: 0 10px 18px rgb(224 106 24 / 22%);
  transition: transform .18s ease, box-shadow .18s ease;
}
.download-link span { min-width: 0; }
.download-link:hover { transform: translateY(-2px); box-shadow: 0 14px 22px rgb(224 106 24 / 30%); }

.hero-art { display: flex; justify-content: center; }
.hero-art img {
  width: min(460px, 100%);
  filter: drop-shadow(0 24px 28px rgb(120 62 18 / 18%));
  animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

.section { padding: 88px 0; }
.section-heading { max-width: 40rem; margin: 0 auto 40px; text-align: center; }
.section-heading h2, .about h2 { font-size: clamp(30px, 4vw, 42px); line-height: 1.2; letter-spacing: -0.03em; }
.section-heading p { margin-top: 12px; color: var(--ink-soft); }

.features { background: linear-gradient(180deg, transparent, #fff6ec 18%, #fff6ec 82%, transparent); }
.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 56px; }
.feature-card {
  padding: 22px 18px 24px; background: #fff; border-radius: 20px;
  box-shadow: var(--shadow);
}
.feature-icon {
  display: flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; margin-bottom: 16px; border-radius: 14px;
  color: var(--cape); background: #fff1ea;
}
.feature-card h3 { margin-bottom: 8px; font-size: 18px; }
.feature-card p { color: var(--ink-soft); font-size: 14.5px; line-height: 1.65; text-wrap: pretty; }
.app-previews { display: flex; align-items: end; justify-content: center; gap: 36px; }
.app-previews img { width: min(300px, 42vw); border-radius: 28px; box-shadow: var(--shadow); }

.about-layout {
  display: grid; grid-template-columns: 1.4fr .8fr; gap: 40px; align-items: end;
  padding: 36px 40px; border-radius: 28px; background: #fff; box-shadow: var(--shadow);
}
.about p { margin-top: 14px; max-width: 42em; color: var(--ink-soft); font-size: 17px; }
.about-note { margin-top: 0 !important; color: var(--ink) !important; font-weight: 700; }

.qualifications { padding-top: 20px; }
.qualification-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.qualification-card { padding: 24px 26px 10px; background: #fff; border-radius: 22px; box-shadow: var(--shadow); }
.qualification-card h3 { margin-bottom: 8px; font-size: 18px; }
.qualification-card dl > div { display: grid; grid-template-columns: 7.4rem minmax(0, 1fr); gap: 12px; padding: 11px 0; font-size: 14px; border-top: 1px solid var(--line); }
.qualification-card dt { color: var(--ink-soft); }
.qualification-card dd { font-weight: 650; overflow-wrap: anywhere; }
.certificate { margin-top: 18px; padding: 14px; background: #fff; border-radius: 22px; box-shadow: var(--shadow); }
.certificate img { width: 100%; border-radius: 14px; }
.certificate figcaption { padding: 12px 8px 4px; text-align: center; color: var(--ink-soft); font-size: 14px; }

.site-footer { margin-top: 20px; padding: 48px 0 28px; background: #2a211c; color: rgb(255 247 238 / 72%); }
.footer-grid { display: grid; grid-template-columns: 1.3fr .8fr .9fr; gap: 32px; }
.site-footer h3, .site-footer h4 { color: #fff7ee; }
.site-footer h3 { margin-bottom: 10px; font-size: 22px; }
.site-footer h4 { margin-bottom: 12px; font-size: 14px; }
.footer-links, .footer-contact { display: flex; flex-direction: column; gap: 8px; }
.footer-links a:hover, .footer-contact a:hover, .copyright a:hover { color: #ffd7a8; }
.copyright { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgb(255 247 238 / 12%); text-align: center; font-size: 12px; color: rgb(255 247 238 / 48%); }
.copyright a { color: inherit; }

@media (max-width: 900px) {
  .hero-layout, .about-layout, .feature-grid, .qualification-grid, .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-layout, .about-layout, .footer-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .hero { text-align: center; }
  .hero-kicker, .hero-description, .hero-proof, .downloads { margin-inline: auto; }
  .hero-proof { justify-content: center; }
  .hero-art { order: -1; }
  .hero-art img { width: min(280px, 70vw); }
  .about-layout { text-align: left; }
  .app-previews { flex-direction: column; align-items: center; }
  .app-previews img { width: min(280px, 78vw); }
}
@media (max-width: 680px) {
  .container { width: min(1120px, calc(100% - 28px)); }
  .navigation { min-height: 64px; }
  .brand img { height: 42px; }
  .nav-links { gap: 14px; font-size: 13px; }
  .nav-links a:not(.nav-download) { display: none; }
  .downloads { grid-template-columns: 1fr; width: min(300px, 100%); }
  .feature-grid, .qualification-grid { grid-template-columns: 1fr; }
  .qualification-card dl > div { grid-template-columns: 1fr; gap: 2px; }
  .section { padding: 56px 0; }
  .hero h1 { font-size: 36px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}