:root {
  --ink: #17151f;
  --muted: #666273;
  --paper: #fbfafc;
  --surface: #ffffff;
  --line: #e8e4ee;
  --violet: #6b31d5;
  --violet-dark: #3e167f;
  --pink: #d83a91;
  --cyan: #0b7894;
  --soft: #f1ecfb;
  --radius: 22px;
  --shadow: 0 20px 55px rgba(40, 19, 75, 0.11);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 2%, rgba(216, 58, 145, 0.11), transparent 24rem),
    radial-gradient(circle at 10% 30%, rgba(107, 49, 213, 0.08), transparent 22rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.72;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 999;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: white;
  border-radius: 12px;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(232, 228, 238, 0.9);
  background: rgba(251, 250, 252, 0.88);
  backdrop-filter: blur(18px);
}
.nav {
  width: min(1180px, calc(100% - 2rem));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 850;
  font-size: 1.6rem;
  letter-spacing: -0.03em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}
.nav-links a {
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  color: #4e4958;
  font-weight: 700;
  font-size: 0.94rem;
}
.nav-links a:hover, .nav-links a[aria-current="page"] {
  color: var(--violet-dark);
  background: var(--soft);
}
.menu-button {
  display: none;
  width: 46px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
  font: inherit;
  font-weight: 800;
}

.shell { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; }
.hero {
  padding: clamp(3.5rem, 6vw, 6rem) 0 4.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: clamp(2rem, 6vw, 5.5rem);
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 1.2rem;
  color: var(--violet-dark);
  font-weight: 850;
  font-size: 0.83rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), var(--pink));
}
h1, h2, h3 { line-height: 1.12; letter-spacing: -0.045em; }
h1 {
  margin: 0;
  font-size: clamp(2.7rem, 4.5vw, 4.2rem);
  max-width: 100%;
  line-height: 1.25;
  text-wrap: balance;
}
h1 .gradient {
  color: transparent;
  background: linear-gradient(105deg, var(--violet-dark), var(--violet) 46%, var(--pink));
  background-clip: text;
  -webkit-background-clip: text;
}
.hero-copy {
  max-width: 650px;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.8vw, 1.22rem);
}
.actions { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 14px;
  font-weight: 850;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary {
  color: white;
  background: linear-gradient(120deg, var(--violet-dark), var(--violet));
  box-shadow: 0 14px 35px rgba(107, 49, 213, 0.24);
}
.button-secondary { background: white; border-color: var(--line); }
.button-text { color: var(--violet-dark); padding-inline: 0; }
.button-text::after { content: "→"; margin-left: 0.45rem; }

.hero-card {
  position: relative;
  padding: 1rem;
  border: 1px solid white;
  border-radius: 32px;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: var(--shadow);
  transform: rotate(1.5deg);
}
.hero-card img { width: 100%; height: auto; aspect-ratio: 16/10; object-fit: cover; border-radius: 24px; }
.hero-note {
  position: absolute;
  left: -1rem;
  bottom: -1.2rem;
  max-width: 270px;
  padding: 1rem 1.05rem;
  border: 1px solid rgba(232, 228, 238, 0.9);
  border-radius: 16px;
  background: white;
  box-shadow: var(--shadow);
  font-size: 0.9rem;
  font-weight: 750;
  transform: rotate(-1.5deg);
}
.hero-note strong { display: block; color: var(--violet-dark); font-size: 1.05rem; }

.notice {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  margin: 0 0 2.2rem;
  padding: 1rem 1.15rem;
  border: 1px solid #d9cef0;
  border-radius: 16px;
  background: #f6f1ff;
  color: #4b376c;
}
.notice::before { content: "i"; flex: 0 0 auto; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%; background: var(--violet); color: white; font-weight: 900; }
.shell.notice { margin-inline: auto; }

.section { padding: clamp(3.8rem, 8vw, 7rem) 0; }
.section-tight { padding: 3.5rem 0; }
.section-dark {
  color: white;
  background: #17131f;
}
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 2rem;
  margin-bottom: 2rem;
}
.section-head h2, .article h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.4rem); }
.section-head p { max-width: 620px; margin: 0; color: var(--muted); }
.section-dark .section-head p { color: #bbb4c8; }
.section-dark .section-head .eyebrow { color: #d8c4ff; }

.grid { display: grid; gap: 1.15rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  position: relative;
  overflow: hidden;
  padding: 1.45rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 8px 24px rgba(29, 21, 45, 0.04);
}
.card:hover { border-color: #cfc2e9; }
.card-number { color: var(--violet); font-size: 0.8rem; font-weight: 900; letter-spacing: 0.12em; }
.card h3 { margin: 0.75rem 0 0.55rem; font-size: 1.4rem; }
.card p { margin: 0; color: var(--muted); }
.card .button-text { margin-top: 0.9rem; }
.tag {
  display: inline-flex;
  padding: 0.32rem 0.62rem;
  border-radius: 999px;
  background: var(--soft);
  color: var(--violet-dark);
  font-size: 0.78rem;
  font-weight: 850;
}
.product-card { display: flex; flex-direction: column; min-height: 320px; }
.product-card .product-meta { margin-top: auto; padding-top: 1.2rem; }
.product-card ul { margin: 1rem 0; padding-left: 1.15rem; color: var(--muted); }
.product-card li + li { margin-top: 0.35rem; }

.recommendation-card { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 2rem; align-items: center; padding: clamp(1.4rem, 4vw, 2.5rem); }
.referral-panel { padding: 1.5rem; border-radius: 16px; background: var(--soft); }
.referral-code { display: block; margin: 0.3rem 0; font-size: clamp(2rem, 5vw, 3rem); font-variant-numeric: tabular-nums; letter-spacing: 0.08em; color: var(--violet-dark); }
.profile { max-width: 780px; }
.profile h2 { margin: 0 0 1rem; font-size: clamp(2.2rem, 5vw, 4rem); }
.profile p { color: var(--muted); }

.page-hero { padding: clamp(3.5rem, 8vw, 7rem) 0 2.5rem; }
.page-hero h1 { max-width: 20em; font-size: clamp(2.2rem, 5vw, 4rem); }
.page-hero p { max-width: 720px; color: var(--muted); font-size: 1.1rem; }
.breadcrumbs { color: var(--muted); font-size: 0.9rem; margin-bottom: 1.2rem; }
.breadcrumbs a { color: var(--violet-dark); font-weight: 750; }

.article-layout { display: grid; grid-template-columns: minmax(0, 780px) 260px; gap: 4rem; align-items: start; }
.article { min-width: 0; }
.article h2 { margin-top: 3rem; font-size: clamp(1.75rem, 4vw, 2.5rem); }
.article h3 { margin-top: 2rem; font-size: 1.35rem; }
.article p, .article li { color: #4f4a58; }
.article a:not(.button) { color: var(--violet-dark); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.article ul, .article ol { padding-left: 1.4rem; }
.article blockquote { margin: 2rem 0; padding: 1.2rem 1.4rem; border-left: 4px solid var(--violet); background: var(--soft); border-radius: 0 16px 16px 0; }
.article blockquote p { margin: 0; color: #46365f; }
.toc { position: sticky; top: 100px; padding: 1.1rem; border: 1px solid var(--line); border-radius: 16px; background: white; }
.toc strong { display: block; margin-bottom: 0.65rem; }
.toc a { display: block; padding: 0.35rem 0; color: var(--muted); font-size: 0.9rem; }
.toc a:hover { color: var(--violet-dark); }

.comparison { width: 100%; border-collapse: collapse; margin: 1.4rem 0; background: white; border-radius: 16px; overflow: hidden; box-shadow: 0 0 0 1px var(--line); }
.comparison th, .comparison td { padding: 0.9rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.comparison th { background: var(--soft); color: var(--violet-dark); }
.comparison tr:last-child td { border-bottom: 0; }

.site-footer { padding: 3.5rem 0 2rem; border-top: 1px solid var(--line); background: white; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 0.8fr 0.8fr; gap: 2rem; }
.footer-grid h3 { margin-top: 0; }
.footer-grid p, .footer-grid a { color: var(--muted); font-size: 0.92rem; }
.footer-links { display: grid; gap: 0.45rem; }
.footer-bottom { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.85rem; }

@media (max-width: 900px) {
  .hero, .article-layout { grid-template-columns: 1fr; }
  .hero { padding-top: 3.5rem; }
  .hero-card { width: min(100%, 640px); }
  .toc { position: static; order: -1; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 700px) {
  .nav { min-height: 68px; }
  .brand { font-size: 1.4rem; }
  .menu-button { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    padding: 0.85rem 1rem 1rem;
    border-bottom: 1px solid var(--line);
    background: rgba(251, 250, 252, 0.98);
    flex-direction: column;
    align-items: stretch;
  }
  .nav-links[data-open="true"] { display: flex; }
  .nav-links a { padding: 0.75rem 1rem; }
  h1 { font-size: clamp(2.3rem, 9vw, 3.6rem); }
  .hero-card { transform: none; }
  .hero-note { transform: none; }
  .hero-note { left: 0.2rem; bottom: -2rem; }
  .grid-3, .grid-2, .footer-grid, .recommendation-card { grid-template-columns: 1fr; }
  .section-head { align-items: flex-start; flex-direction: column; }
  .comparison { display: block; overflow-x: auto; white-space: nowrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}