:root {
  --ink: #3d2c29;
  --muted: #7a6258;
  --paper: #f6ead8;
  --cream: #fff6eb;
  --clay: #e07a5f;
  --clay-deep: #c45d48;
  --mint: #81b29a;
  --mint-deep: #5d9078;
  --butter: #f2cc8f;
  --rose: #e8a5a0;
  --sky: #7eb8c9;
  --brown: #8b6b4a;
  --ridge: #d8c4ae;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --wrap: 1120px;
  --radius: 28px;
  --soft: 0 10px 0 rgba(139, 107, 74, 0.12), 0 18px 32px rgba(61, 44, 41, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.68;
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(242, 204, 143, 0.45), transparent 28%),
    radial-gradient(circle at 88% 4%, rgba(232, 165, 160, 0.32), transparent 26%),
    radial-gradient(circle at 70% 92%, rgba(129, 178, 154, 0.22), transparent 30%),
    radial-gradient(circle at 8% 86%, rgba(126, 184, 201, 0.18), transparent 24%);
}

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

a {
  color: var(--clay-deep);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--ink);
}

:focus-visible {
  outline: 3px solid var(--clay);
  outline-offset: 3px;
  border-radius: 12px;
}

.skip {
  position: absolute;
  left: 12px;
  top: -64px;
  z-index: 50;
  padding: 0.55rem 0.95rem;
  border-radius: 999px;
  background: var(--clay);
  color: #fff8f2;
  font-weight: 700;
  text-decoration: none;
}

.skip:focus {
  top: 12px;
}

.wrap {
  width: min(calc(100% - 2rem), var(--wrap));
  margin: 0 auto;
}

.topbar {
  background: linear-gradient(180deg, #f3d4b8, #e8c4a4);
  color: #5c4338;
  font-size: 0.86rem;
  font-weight: 650;
  box-shadow: 0 6px 0 rgba(139, 107, 74, 0.12);
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.55rem 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 246, 235, 0.92);
  backdrop-filter: blur(8px);
}

.site-header.is-scrolled {
  box-shadow: 0 10px 24px rgba(61, 44, 41, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 50%;
  box-shadow:
    inset 4px 5px 8px rgba(255, 255, 255, 0.55),
    inset -4px -6px 10px rgba(61, 44, 41, 0.12),
    0 8px 0 rgba(139, 107, 74, 0.14);
}

.brand small {
  display: block;
  font-size: 0.72rem;
  font-weight: 650;
  color: var(--muted);
}

.nav-toggle {
  display: none;
  border: 0;
  border-radius: 999px;
  padding: 0.65rem 1rem;
  font: inherit;
  font-weight: 800;
  color: #fff8f2;
  background: linear-gradient(180deg, #f09176, var(--clay) 58%, var(--clay-deep));
  box-shadow: 0 5px 0 #b84f3c;
  cursor: pointer;
}

.nav-panel ul {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-panel a {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
}

.nav-panel a:hover,
.nav-panel a[aria-current="page"] {
  background: rgba(224, 122, 95, 0.12);
}

.nav-cta {
  background: linear-gradient(180deg, #f09176, var(--clay) 58%, var(--clay-deep));
  color: #fff8f2 !important;
  box-shadow: 0 5px 0 #b84f3c, 0 10px 16px rgba(196, 93, 72, 0.22);
}

.nav-cta:hover {
  filter: brightness(1.04);
}

main {
  padding-bottom: 3rem;
}

.hero,
.page-hero {
  padding: 2.4rem 0 1.2rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.38rem 0.85rem;
  border-radius: 999px;
  background: linear-gradient(180deg, #ffe7c2, var(--butter));
  color: #6a4b2a;
  font-size: 0.82rem;
  font-weight: 800;
  box-shadow: 0 5px 0 #d4a96a;
}

.tag.alt {
  background: linear-gradient(180deg, #cde8da, var(--mint));
  color: #234236;
  box-shadow: 0 5px 0 #5d9078;
}

h1,
h2,
h3 {
  margin: 0 0 0.65rem;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.1rem, 4vw, 3.4rem);
}

h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
}

.lead {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1.2rem 0 1.4rem;
}

.btn,
.btn-alt {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0.85rem 1.45rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 800;
}

.btn {
  color: #fff8f2;
  background: linear-gradient(180deg, #f09176, var(--clay) 55%, var(--clay-deep));
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.28),
    0 8px 0 #b84f3c,
    0 14px 20px rgba(196, 93, 72, 0.22);
}

.btn-alt {
  color: var(--ink);
  background: linear-gradient(180deg, #fffaf3, #f3e0c8);
  box-shadow:
    inset 0 2px 0 #fff,
    0 8px 0 var(--ridge),
    0 14px 20px rgba(61, 44, 41, 0.08);
}

.btn:hover,
.btn-alt:hover {
  transform: translateY(2px);
}

.btn:active,
.btn-alt:active {
  transform: translateY(6px);
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.2),
    0 3px 0 #b84f3c;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.metric {
  padding: 0.95rem 1rem;
  border-radius: 22px;
  background: var(--cream);
  box-shadow: var(--soft);
}

.metric strong,
.metric span {
  display: block;
}

.metric strong {
  font-size: 1.08rem;
}

.metric span {
  color: var(--muted);
  font-size: 0.86rem;
}

.clay-stage {
  position: relative;
  min-height: 420px;
  display: grid;
  place-items: center;
}

.clay-blob {
  position: absolute;
  border-radius: 50%;
  filter: saturate(1.05);
  animation: bob 5.5s ease-in-out infinite;
}

.blob-a {
  width: 150px;
  height: 150px;
  left: 0;
  top: 18px;
  background: radial-gradient(circle at 32% 28%, #ffd9a8, var(--butter) 46%, #d9a45e);
  box-shadow: inset 10px 12px 16px rgba(255, 255, 255, 0.4), 0 16px 0 rgba(180, 130, 70, 0.16);
}

.blob-b {
  width: 110px;
  height: 110px;
  right: 8px;
  top: 36px;
  background: radial-gradient(circle at 30% 26%, #bfe8d4, var(--mint) 50%, var(--mint-deep));
  box-shadow: inset 8px 10px 14px rgba(255, 255, 255, 0.35), 0 14px 0 rgba(80, 120, 100, 0.16);
  animation-delay: -1.4s;
}

.blob-c {
  width: 92px;
  height: 92px;
  left: 28px;
  bottom: 28px;
  background: radial-gradient(circle at 34% 28%, #f7c7c2, var(--rose) 52%, #c97874);
  box-shadow: inset 8px 10px 14px rgba(255, 255, 255, 0.38), 0 12px 0 rgba(150, 80, 76, 0.14);
  animation-delay: -2.6s;
}

.clay-frame {
  position: relative;
  z-index: 1;
  width: min(100%, 430px);
  padding: 1rem;
  border-radius: 36px;
  background: linear-gradient(180deg, #fffaf2, #f0dcc4);
  box-shadow:
    inset 0 3px 0 #fff,
    0 14px 0 #d2b79a,
    0 26px 36px rgba(61, 44, 41, 0.14);
}

.clay-frame img {
  width: 100%;
  border-radius: 26px;
  box-shadow: 0 8px 0 rgba(139, 107, 74, 0.1);
}

section {
  padding: 2.2rem 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.section-head p {
  margin: 0;
  max-width: 38ch;
  color: var(--muted);
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 1rem;
}

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

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

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

.card,
.seo-card,
.platform,
.step {
  display: block;
  padding: 1.15rem 1.15rem 1.25rem;
  border-radius: var(--radius);
  background: var(--cream);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--soft);
}

.seo-card:hover,
.card:hover {
  transform: translateY(-2px);
}

.kicker {
  display: inline-block;
  margin-bottom: 0.45rem;
  color: var(--clay-deep);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.clay-orb {
  width: 62px;
  height: 62px;
  margin-bottom: 0.75rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #3d2c29;
  box-shadow:
    inset 7px 9px 12px rgba(255, 255, 255, 0.42),
    inset -7px -9px 14px rgba(61, 44, 41, 0.12),
    0 10px 0 rgba(139, 107, 74, 0.12);
}

.orb-clay {
  background: radial-gradient(circle at 32% 28%, #ffb59d, var(--clay) 58%, var(--clay-deep));
}

.orb-mint {
  background: radial-gradient(circle at 32% 28%, #c8eedc, var(--mint) 58%, var(--mint-deep));
}

.orb-butter {
  background: radial-gradient(circle at 32% 28%, #ffe7b8, var(--butter) 58%, #d4a45a);
}

.orb-sky {
  background: radial-gradient(circle at 32% 28%, #cceaf2, var(--sky) 58%, #4f8ea0);
}

.orb-rose {
  background: radial-gradient(circle at 32% 28%, #f8d2ce, var(--rose) 58%, #c97874);
}

.detail {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.4rem;
  align-items: center;
}

.figure {
  padding: 0.9rem;
  border-radius: 34px;
  background: linear-gradient(180deg, #fffaf2, #eed9c0);
  box-shadow: var(--soft);
}

.figure img {
  border-radius: 24px;
}

.anno,
.warn {
  margin: 0 0 0.7rem;
  padding: 0.8rem 0.95rem;
  border-radius: 18px;
  background: #fff1dc;
  color: #6a4b2a;
}

.warn {
  background: #fde3dc;
  color: #7a3b32;
  font-weight: 650;
}

.crumbs {
  margin: 0 0 0.7rem;
  color: var(--muted);
}

.faq details {
  margin-bottom: 0.75rem;
  padding: 0.2rem 1rem 0.2rem;
  border-radius: 22px;
  background: var(--cream);
  box-shadow: var(--soft);
}

.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 0.95rem 0;
  font-weight: 800;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--clay-deep);
}

.faq details[open] summary::after {
  content: "–";
}

.faq details p {
  margin: 0 0 1rem;
  color: var(--muted);
}

footer {
  padding: 2.4rem 0 1.6rem;
  background: linear-gradient(180deg, #efe0cc, #e4cfb4);
  box-shadow: inset 0 10px 0 rgba(255, 255, 255, 0.25);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 1.2rem;
}

.footer-grid h3 {
  font-size: 1rem;
}

.footer-grid ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-grid li {
  margin: 0.35rem 0;
}

.footer-grid p {
  color: var(--muted);
}

.logo-block img {
  width: 44px;
  height: 44px;
}

.legal {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 2px dashed rgba(139, 107, 74, 0.22);
  color: var(--muted);
  font-size: 0.88rem;
}

@keyframes bob {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@media (max-width: 980px) {
  .hero,
  .detail,
  .footer-grid,
  .metrics,
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }

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

  .nav-panel {
    display: none;
    position: absolute;
    right: 1rem;
    top: calc(100% - 0.3rem);
    width: min(280px, calc(100% - 2rem));
    padding: 0.7rem;
    border-radius: 24px;
    background: var(--cream);
    box-shadow: var(--soft);
  }

  .nav-panel.is-open {
    display: block;
  }

  .nav-panel ul {
    flex-direction: column;
    align-items: stretch;
  }

  .site-header .wrap {
    position: relative;
  }
}

@media (max-width: 700px) {
  .hero,
  .detail,
  .footer-grid,
  .metrics,
  .grid-4,
  .grid-3,
  .grid-2,
  .section-head {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .clay-stage {
    min-height: 340px;
  }
}

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

  .clay-blob,
  .btn,
  .btn-alt,
  .card,
  .seo-card {
    animation: none !important;
    transition: none !important;
  }

  .btn:hover,
  .btn-alt:hover,
  .btn:active,
  .btn-alt:active,
  .card:hover,
  .seo-card:hover {
    transform: none;
  }
}