:root {
  --ink: #101828;
  --ink-soft: #475467;
  --paper: #fafaf7;
  --panel: #ffffff;
  --line: #e4e4dc;
  --green: #047857;
  --green-dark: #065f46;
  --green-soft: #ecfdf5;
  --amber: #b45309;
  --amber-soft: #fffbeb;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
}

h1, h2, h3 { font-family: Georgia, "Times New Roman", serif; font-weight: 700; letter-spacing: -0.01em; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 920px; }
a { color: var(--green); text-decoration: none; }

.topbar {
  background: var(--ink); color: #d1d5db;
  font-size: 0.82rem; text-align: center; padding: 8px 16px;
}
.topbar a { color: #6ee7b7; font-weight: 600; }

header {
  background: var(--panel); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 50;
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
.brand { font-family: Georgia, serif; font-size: 1.3rem; font-weight: 700; color: var(--ink); }
.brand em { color: var(--green); font-style: normal; }
.menu { display: flex; align-items: center; gap: 26px; }
.menu > a { color: var(--ink-soft); font-size: 0.94rem; font-weight: 500; }
.menu > a:hover, .menu > a[aria-current="page"] { color: var(--ink); }
.lang { display: flex; gap: 2px; border: 1px solid var(--line); border-radius: 8px; padding: 3px; }
.lang a { padding: 4px 12px; border-radius: 6px; font-size: 0.82rem; font-weight: 700; color: var(--ink-soft); }
.lang a.on { background: var(--ink); color: #fff; }
.cta-btn {
  background: var(--green); color: #fff; padding: 11px 24px;
  border-radius: 8px; font-weight: 700; font-size: 0.92rem;
  transition: background .2s;
}
.cta-btn:hover { background: var(--green-dark); }

.hero { padding: 90px 0 70px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.kicker {
  display: inline-block; background: var(--green-soft); color: var(--green-dark);
  border: 1px solid #a7f3d0; padding: 5px 14px; border-radius: 6px;
  font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: 20px;
}
.hero h1 { font-size: clamp(2rem, 4.5vw, 3rem); line-height: 1.18; margin-bottom: 20px; }
.hero .lede { color: var(--ink-soft); font-size: 1.12rem; margin-bottom: 32px; max-width: 520px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.ghost-btn {
  border: 1.5px solid var(--ink); color: var(--ink); padding: 11px 24px;
  border-radius: 8px; font-weight: 700; font-size: 0.92rem;
}
.ghost-btn:hover { background: var(--ink); color: #fff; }

.stack { display: grid; gap: 14px; }
.layer {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 20px 22px; display: flex; gap: 16px; align-items: center;
  box-shadow: 0 1px 3px rgba(16, 24, 40, 0.05);
}
.layer:nth-child(1), .layer:nth-child(3) { transform: translateX(24px); }
.layer .dot {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: 10px;
  background: var(--green-soft); border: 1px solid #a7f3d0;
  display: grid; place-items: center; font-size: 1.25rem;
}
.layer b { display: block; font-size: 0.98rem; }
.layer span { color: var(--ink-soft); font-size: 0.85rem; }

section { padding: 80px 0; }
section.tint { background: #f2f2ec; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { max-width: 620px; margin-bottom: 48px; }
.sec-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 12px; }
.sec-head p { color: var(--ink-soft); font-size: 1.02rem; }

.cols-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 26px 24px; border-top: 3px solid var(--green);
}
.panel h3 { font-size: 1.08rem; margin-bottom: 10px; }
.panel p { color: var(--ink-soft); font-size: 0.93rem; }
.panel .from { margin-top: 12px; font-weight: 700; color: var(--green-dark); font-size: 0.9rem; }

.compare { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.compare th, .compare td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--line); font-size: 0.94rem; }
.compare thead th { background: var(--ink); color: #fff; font-family: Georgia, serif; font-size: 1rem; }
.compare tbody tr:last-child td { border-bottom: none; }
.compare td:first-child { font-weight: 600; width: 26%; }
.compare td { color: var(--ink-soft); }
.tag { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 0.78rem; font-weight: 700; }
.tag.g { background: var(--green-soft); color: var(--green-dark); }
.tag.a { background: var(--amber-soft); color: var(--amber); }

.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.case { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 26px 24px; }
.case .num {
  font-family: Georgia, serif; font-size: 2.2rem; color: var(--green);
  line-height: 1; margin-bottom: 14px; font-weight: 700;
}
.case h3 { font-size: 1.05rem; margin-bottom: 8px; }
.case p { color: var(--ink-soft); font-size: 0.92rem; }

.about {
  background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--green);
  border-radius: 12px; padding: 40px; max-width: 820px;
}
.about h2 { font-size: 1.6rem; margin-bottom: 16px; }
.about p { color: var(--ink-soft); margin-bottom: 14px; }
.about p:last-child { margin-bottom: 0; }
.about strong { color: var(--ink); }

.qa { max-width: 760px; }
.qa details { border-bottom: 1px solid var(--line); }
.qa summary {
  cursor: pointer; padding: 20px 4px; font-weight: 700; font-size: 1rem;
  list-style: none; display: flex; justify-content: space-between; gap: 16px;
  font-family: Georgia, serif;
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after { content: "›"; color: var(--green); font-size: 1.3rem; transition: transform .2s; }
.qa details[open] summary::after { transform: rotate(90deg); }
.qa .ans { padding: 0 4px 22px; color: var(--ink-soft); font-size: 0.95rem; }

.final {
  background: var(--ink); border-radius: 16px; padding: 60px 40px;
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
}
.final h2 { color: #fff; font-size: clamp(1.4rem, 3vw, 1.9rem); margin-bottom: 8px; }
.final p { color: #9ca3af; max-width: 480px; }
.final .cta-btn { padding: 14px 32px; font-size: 1rem; white-space: nowrap; }

.page-hero { padding: 72px 0 40px; }
.page-hero h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); line-height: 1.2; margin-bottom: 14px; }
.page-hero .lede { color: var(--ink-soft); font-size: 1.08rem; max-width: 640px; }

.mentions { padding: 20px 0 80px; }
.mention {
  display: block;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 24px;
  margin-bottom: 14px;
  transition: border-color .15s, box-shadow .15s;
}
.mention:hover {
  border-color: #a7f3d0;
  box-shadow: 0 2px 10px rgba(16, 24, 40, 0.06);
}
.mention .meta {
  display: flex; flex-wrap: wrap; gap: 10px 16px;
  font-size: 0.82rem; color: var(--ink-soft); margin-bottom: 8px;
}
.mention .source { font-weight: 700; color: var(--green-dark); }
.mention h2 { font-size: 1.15rem; margin-bottom: 6px; color: var(--ink); }
.mention:hover h2 { color: var(--green-dark); }
.mention p { color: var(--ink-soft); font-size: 0.93rem; margin-bottom: 8px; }
.mention .url { font-size: 0.82rem; color: var(--ink-soft); word-break: break-all; }

.empty {
  background: var(--panel); border: 1px dashed var(--line);
  border-radius: 12px; padding: 40px; color: var(--ink-soft); text-align: center;
}

footer { padding: 40px 0 50px; color: var(--ink-soft); font-size: 0.88rem; }
.foot { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.foot nav { display: flex; gap: 20px; flex-wrap: wrap; }
.foot nav a { color: var(--ink-soft); }
.foot nav a:hover { color: var(--ink); }

@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .layer:nth-child(odd) { transform: none; }
  .cols-3, .cases { grid-template-columns: 1fr; }
  .menu > a:not(.cta-btn) { display: none; }
  .compare { display: block; overflow-x: auto; }
  section { padding: 60px 0; }
}