:root {
  --canvas: #f2f4f3;
  --canvas-warm: #ece9e3;
  --surface: #ffffff;
  --ink: #0b1728;
  --ink-soft: #193149;
  --muted: #52606d;
  --line: rgba(11, 23, 40, 0.14);
  --line-strong: rgba(11, 23, 40, 0.28);
  --copper: #be7048;
  --copper-dark: #8f4d31;
  --copper-pale: #f3dfd2;
  --jade: #12685f;
  --jade-pale: #dbeae6;
  --gold: #d8b56b;
  --white: #ffffff;
  --shadow-soft: 0 24px 70px rgba(12, 30, 46, 0.1);
  --shadow-float: 0 34px 90px rgba(12, 30, 46, 0.16);
  --radius-sm: 12px;
  --radius-md: 22px;
  --radius-lg: 36px;
  --shell: min(1280px, calc(100% - 64px));
  --article-shell: min(1160px, calc(100% - 64px));
  --sans: "SF Pro Display", "Avenir Next", Avenir, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --text: "SF Pro Text", "Avenir Next", Avenir, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 84% 8%, rgba(190, 112, 72, 0.09), transparent 28rem),
    linear-gradient(180deg, #f7f8f7 0, var(--canvas) 44rem, #eef1f0 100%);
  font-family: var(--text);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.2;
  background-image: radial-gradient(rgba(11, 23, 40, 0.26) 0.5px, transparent 0.6px);
  background-size: 9px 9px;
  mask-image: linear-gradient(to bottom, black, transparent 42rem);
}
img, svg { max-width: 100%; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 4px; }
a:hover { color: var(--copper-dark); }
button, input, select { font: inherit; }
button { color: inherit; }
:focus-visible { outline: 3px solid var(--copper); outline-offset: 4px; }
::selection { color: var(--ink); background: var(--copper-pale); }
.skip-link {
  position: fixed;
  left: 18px;
  top: -90px;
  z-index: 150;
  padding: 11px 17px;
  border-radius: 999px;
  background: var(--ink);
  color: white;
}
.skip-link:focus { top: 18px; }
.shell { width: var(--shell); margin-inline: auto; }
.micro {
  font: 750 0.68rem/1.2 var(--sans);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 0 0 18px;
  color: var(--copper-dark);
  font: 750 0.72rem/1.2 var(--sans);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: currentColor; }
.muted { color: var(--muted); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  border-bottom: 1px solid rgba(11, 23, 40, 0.1);
  background: rgba(247, 248, 247, 0.88);
  backdrop-filter: blur(18px) saturate(125%);
}
.header-inner {
  min-height: 76px;
  display: grid;
  grid-template-columns: minmax(190px, 0.8fr) auto minmax(190px, 0.8fr);
  align-items: center;
  gap: 28px;
}
.brand {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  gap: 11px;
  text-decoration: none;
}
.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 13px 13px 13px 4px;
  background: var(--ink);
  color: white;
  font: 800 0.94rem/1 var(--sans);
  box-shadow: inset -8px -8px 18px rgba(255, 255, 255, 0.08);
}
.brand-mark::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 3px solid #f7f8f7;
  background: var(--copper);
}
.brand-word {
  font: 800 0.92rem/1 var(--sans);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.66);
}
.site-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 17px;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 700;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: white;
  background: var(--ink);
  transform: translateY(-1px);
}
.menu-toggle {
  display: none;
  min-width: 48px;
  min-height: 48px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: white;
  font-weight: 750;
  cursor: pointer;
}
.header-state {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font: 700 0.66rem/1 var(--sans);
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
.header-state::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 0 5px rgba(18, 104, 95, 0.1);
}
.language-switcher {
  position: relative;
  justify-self: end;
  font: 750 0.76rem/1 var(--sans);
}
.language-switcher summary {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  cursor: pointer;
  list-style: none;
}
.language-switcher summary::-webkit-details-marker { display: none; }
.language-switcher summary::after { content: "↓"; margin-left: 8px; color: var(--copper-dark); }
.language-switcher[open] summary::after { content: "↑"; }
.language-switcher > div {
  position: absolute;
  right: 0;
  top: calc(100% + 9px);
  z-index: 120;
  min-width: 170px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: white;
  box-shadow: var(--shadow-soft);
}
.language-switcher a {
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 10px;
  color: var(--muted);
  text-decoration: none;
}
.language-switcher a:hover,
.language-switcher a[aria-current="page"] { color: white; background: var(--ink); }

/* Home hero */
.home-hero { padding: 40px 0 56px; overflow: hidden; }
.home-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(420px, 0.94fr);
  gap: clamp(38px, 7vw, 100px);
  align-items: center;
  min-height: 496px;
}
.home-hero-copy { position: relative; z-index: 2; padding: 20px 0 14px; }
.home-hero h1 {
  max-width: 660px;
  margin: 0;
  font: 800 clamp(2.35rem, 4.1vw, 3.6rem)/1.08 var(--sans);
  letter-spacing: -0.045em;
}
.home-hero h1 span { display: block; }
.home-hero h1 .hero-accent { color: var(--copper-dark); }
.hero-lede {
  max-width: 670px;
  margin: 30px 0 0;
  color: var(--ink-soft);
  font-size: clamp(0.98rem, 1vw, 1.06rem);
  line-height: 1.78;
}
.invite-rail {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 20px;
  max-width: 660px;
  margin-top: 32px;
  padding: 19px 20px 19px 24px;
  border: 1px solid rgba(143, 77, 49, 0.25);
  border-radius: 18px 18px 18px 5px;
  background: linear-gradient(110deg, #f8eee8, var(--copper-pale));
  box-shadow: 0 18px 45px rgba(143, 77, 49, 0.1);
  overflow: hidden;
}
.invite-rail::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--copper);
}
.invite-meta { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 20px; }
.invite-meta .micro { color: var(--copper-dark); }
.invite-meta strong {
  font: 820 clamp(1.35rem, 1.9vw, 1.68rem)/1 var(--sans);
  letter-spacing: 0.08em;
}
.invite-rail button {
  min-height: 48px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  background: var(--ink);
  color: white;
  font-weight: 750;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease;
}
.invite-rail button:hover { transform: translateY(-2px); background: var(--copper-dark); }
.invite-benefit { max-width: 660px; margin: 14px 0 0; color: var(--ink-soft); font-size: 0.92rem; font-weight: 700; }
.invite-benefit sup { color: var(--copper-dark); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 29px; }
.button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 0 22px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: white;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 750;
  box-shadow: 0 12px 25px rgba(11, 23, 40, 0.11);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.button:hover { color: white; background: var(--copper-dark); border-color: var(--copper-dark); transform: translateY(-2px); box-shadow: 0 17px 32px rgba(11, 23, 40, 0.16); }
.button.secondary { color: var(--ink); background: transparent; box-shadow: none; }
.button.secondary:hover { color: var(--ink); background: white; border-color: var(--line-strong); }
.button .arrow { font-size: 1.2rem; transition: transform 0.2s ease; }
.button:hover .arrow { transform: translateX(4px); }
.hero-note {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  max-width: 660px;
  margin: 25px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.6;
}
.hero-note strong { color: var(--ink); white-space: nowrap; }

.hero-sculpture { position: relative; min-height: 452px; }
.orbit-field {
  position: absolute;
  inset: 18px 0 18px 18px;
  border-radius: 52% 48% 45% 55% / 44% 46% 54% 56%;
  background:
    radial-gradient(circle at 42% 38%, rgba(255, 255, 255, 0.17), transparent 16%),
    linear-gradient(145deg, #173552, #0b1728 66%);
  box-shadow: var(--shadow-float);
  overflow: hidden;
}
.orbit-field::before,
.orbit-field::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.17);
}
.orbit-field::before { width: 540px; height: 540px; right: -130px; top: 20px; box-shadow: 0 0 0 62px rgba(255, 255, 255, 0.025), 0 0 0 124px rgba(255, 255, 255, 0.02); }
.orbit-field::after { width: 230px; height: 230px; left: -92px; bottom: -70px; border-color: rgba(216, 181, 107, 0.45); }
.orbit-kicker {
  position: absolute;
  left: 58px;
  top: 50px;
  z-index: 2;
  color: rgba(255, 255, 255, 0.65);
}
.orbit-title {
  position: absolute;
  left: 58px;
  top: 88px;
  z-index: 2;
  width: 270px;
  margin: 0;
  color: white;
  font: 720 clamp(1.6rem, 2.5vw, 2.35rem)/1.14 var(--sans);
  letter-spacing: -0.05em;
}
.orbit-index {
  position: absolute;
  right: 44px;
  top: 46px;
  z-index: 2;
  color: var(--gold);
  font: 750 0.72rem/1 var(--sans);
  letter-spacing: 0.12em;
}
.orbit-card {
  position: absolute;
  z-index: 3;
  right: 3px;
  bottom: 62px;
  width: min(360px, 72%);
  padding: 26px;
  border: 1px solid rgba(11, 23, 40, 0.08);
  border-radius: 22px 22px 22px 6px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 24px 58px rgba(4, 16, 29, 0.22);
  backdrop-filter: blur(12px);
}
.orbit-card::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 28px;
  width: 34px;
  height: 3px;
  border-radius: 999px;
  background: var(--copper);
}
.orbit-card h2 { margin: 8px 0 18px; font: 760 1.12rem/1.35 var(--sans); letter-spacing: -0.02em; }
.orbit-list { margin: 0; }
.orbit-list div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
}
.orbit-list dt { color: var(--muted); }
.orbit-list dd { margin: 0; color: var(--ink); font-weight: 750; text-align: right; }
.orbit-seal {
  position: absolute;
  z-index: 4;
  left: 10px;
  bottom: 30px;
  display: grid;
  place-items: center;
  width: 112px;
  height: 112px;
  border-radius: 50%;
  border: 1px solid rgba(11, 23, 40, 0.16);
  background: var(--gold);
  color: var(--ink);
  text-align: center;
  font: 800 0.65rem/1.45 var(--sans);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  box-shadow: 0 18px 40px rgba(11, 23, 40, 0.18);
  transform: rotate(-8deg);
}

.proof-strip { border-block: 1px solid var(--line); background: rgba(255, 255, 255, 0.58); }
.proof-strip-inner { display: grid; grid-template-columns: 0.72fr 1fr 1fr 1fr; min-height: 92px; }
.proof-label,
.proof-item { display: flex; align-items: center; padding: 20px 26px; border-right: 1px solid var(--line); }
.proof-label { padding-left: 0; color: var(--copper-dark); font: 780 0.67rem/1.4 var(--sans); letter-spacing: 0.13em; text-transform: uppercase; }
.proof-item { gap: 13px; color: var(--ink-soft); font-size: 0.86rem; font-weight: 650; }
.proof-item::before { content: ""; flex: 0 0 auto; width: 7px; height: 7px; border-radius: 50%; background: var(--jade); }
.proof-item:last-child { border-right: 0; padding-right: 0; }

/* Sections */
.section { position: relative; padding: 76px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section.alt { background: rgba(255, 255, 255, 0.76); }
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  align-items: end;
  gap: 44px;
  margin-bottom: 38px;
}
.section-head h2 {
  max-width: 750px;
  margin: 0;
  font: 780 clamp(1.85rem, 2.9vw, 2.75rem)/1.1 var(--sans);
  letter-spacing: -0.04em;
}
.section-head > p,
.section-head > div + p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(340px, 0.88fr);
  gap: 18px;
}
.feature-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 356px;
  padding: clamp(28px, 3vw, 44px);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 8px;
  color: white;
  background: linear-gradient(145deg, #173552, var(--ink) 70%);
  box-shadow: var(--shadow-soft);
  text-decoration: none;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  width: 390px;
  height: 390px;
  right: -122px;
  top: -112px;
  border: 1px solid rgba(216, 181, 107, 0.48);
  border-radius: 50%;
  box-shadow: 0 0 0 58px rgba(216, 181, 107, 0.055), 0 0 0 116px rgba(216, 181, 107, 0.028);
}
.feature-card::after { content: "Read"; position: absolute; right: 34px; bottom: 34px; color: var(--gold); font: 750 0.7rem/1 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; }
.feature-card .micro { position: relative; z-index: 1; color: #b9c7d4; }
.feature-card h3 {
  position: relative;
  z-index: 1;
  max-width: 650px;
  margin: auto 0 22px;
  font: 780 clamp(1.9rem, 2.9vw, 2.8rem)/1.08 var(--sans);
  letter-spacing: -0.04em;
}
.feature-card p { position: relative; z-index: 1; max-width: 570px; margin: 0; color: #c9d4de; }
.feature-card:hover { color: white; transform: translateY(-4px); }
.card-stack { display: grid; grid-template-rows: 1fr 1fr; gap: 18px; }
.small-card {
  position: relative;
  display: grid;
  grid-template-columns: 66px 1fr auto;
  align-items: center;
  gap: 20px;
  min-height: 186px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 10px var(--radius-md) var(--radius-md) var(--radius-md);
  background: rgba(255, 255, 255, 0.84);
  text-decoration: none;
  box-shadow: 0 12px 35px rgba(12, 30, 46, 0.055);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.small-card:nth-child(2) { background: var(--jade-pale); }
.small-card:hover { color: var(--ink); background: white; transform: translateX(5px); box-shadow: var(--shadow-soft); }
.card-no { color: var(--copper-dark); font: 800 1.6rem/1 var(--sans); letter-spacing: -0.03em; }
.small-card h3 { margin: 0 0 9px; font-size: 1.1rem; line-height: 1.25; letter-spacing: -0.02em; }
.small-card p { margin: 0; color: var(--muted); font-size: 0.88rem; }
.card-arrow { color: var(--copper-dark); font-size: 1.25rem; }

.method-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr 1.08fr;
  align-items: stretch;
  overflow: hidden;
  border-radius: var(--radius-lg) 10px var(--radius-lg) var(--radius-lg);
  background: var(--ink);
  box-shadow: var(--shadow-soft);
}
.method-item { position: relative; min-height: 252px; padding: 34px 30px; color: white; }
.method-item + .method-item { border-left: 1px solid rgba(255, 255, 255, 0.13); }
.method-item:nth-child(2) { margin: 24px 0; border-radius: 20px; color: var(--ink); background: var(--copper-pale); transform: translateY(20px); }
.method-item:nth-child(3) { padding-top: 80px; }
.method-item .step { display: inline-flex; align-items: center; gap: 10px; color: var(--gold); font: 780 0.72rem/1 var(--sans); letter-spacing: 0.16em; }
.method-item .step::after { content: ""; width: 36px; height: 1px; background: currentColor; }
.method-item:nth-child(2) .step { color: var(--copper-dark); }
.method-item h3 { margin: 40px 0 13px; font-size: clamp(1.12rem, 1.4vw, 1.32rem); letter-spacing: -0.025em; }
.method-item:nth-child(2) h3 { margin-top: 26px; }
.method-item p { margin: 0; color: #b9c6d2; font-size: 0.92rem; }
.method-item:nth-child(2) p { color: #614c42; }

.tool-promo {
  display: grid;
  grid-template-columns: minmax(320px, 0.82fr) minmax(0, 1.18fr);
  border-radius: var(--radius-lg) var(--radius-lg) 8px var(--radius-lg);
  background: white;
  box-shadow: var(--shadow-float);
  overflow: hidden;
}
.tool-visual {
  position: relative;
  min-height: 336px;
  padding: 34px;
  color: white;
  background: var(--jade);
  overflow: hidden;
}
.tool-visual::before,
.tool-visual::after { content: ""; position: absolute; border-radius: 50%; border: 1px solid rgba(255, 255, 255, 0.25); }
.tool-visual::before { width: 360px; height: 360px; right: -145px; bottom: -100px; box-shadow: 0 0 0 55px rgba(255, 255, 255, 0.035); }
.tool-visual::after { width: 120px; height: 120px; left: -42px; top: 92px; }
.tool-number { position: absolute; right: 36px; top: 28px; color: rgba(255, 255, 255, 0.28); font: 800 3.6rem/1 var(--sans); letter-spacing: -0.05em; }
.tool-formula { position: absolute; z-index: 1; left: 40px; bottom: 42px; font: 760 clamp(1.55rem, 2.3vw, 2.2rem)/1.14 var(--sans); letter-spacing: -0.035em; }
.tool-copy { display: flex; flex-direction: column; justify-content: center; padding: clamp(42px, 7vw, 86px); }
.tool-copy h2 { margin: 0 0 22px; font: 780 clamp(1.8rem, 2.7vw, 2.6rem)/1.1 var(--sans); letter-spacing: -0.04em; }
.tool-copy p { margin: 0 0 30px; color: var(--muted); }
.tool-copy .button { align-self: flex-start; }

.trust-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.85fr) minmax(0, 1.15fr);
  gap: 56px;
  align-items: start;
}
.trust-copy { position: sticky; top: 120px; padding-top: 8px; }
.trust-copy h2 { max-width: 560px; margin: 0 0 22px; font: 780 clamp(1.8rem, 2.7vw, 2.55rem)/1.1 var(--sans); letter-spacing: -0.04em; }
.trust-copy p { color: var(--muted); }
.trust-copy a { display: inline-flex; margin-top: 15px; color: var(--copper-dark); font-weight: 750; text-decoration: none; }
.trust-table { margin: 0; border-top: 1px solid var(--line-strong); }
.trust-table div { display: grid; grid-template-columns: 0.68fr 1.32fr; gap: 24px; padding: 19px 4px; border-bottom: 1px solid var(--line); }
.trust-table dt { font-weight: 750; }
.trust-table dd { margin: 0; color: var(--muted); }

/* Interior page headers */
.page-head {
  position: relative;
  padding: 62px 0 50px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 84% 22%, rgba(190, 112, 72, 0.16), transparent 21rem),
    rgba(255, 255, 255, 0.68);
}
.page-head::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -270px;
  width: 490px;
  height: 490px;
  border: 1px solid rgba(11, 23, 40, 0.12);
  border-radius: 50%;
  box-shadow: 0 0 0 65px rgba(11, 23, 40, 0.018), 0 0 0 130px rgba(11, 23, 40, 0.013);
}
.page-head-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(230px, 0.6fr); gap: 48px; align-items: end; }
.page-head h1 { position: relative; z-index: 1; max-width: 780px; margin: 0; font: 800 clamp(2.05rem, 3.4vw, 3.1rem)/1.14 var(--sans); letter-spacing: -0.04em; }
.page-summary { position: relative; z-index: 1; max-width: 760px; margin: 26px 0 0; color: var(--muted); font-size: 1rem; }
.page-stamp {
  justify-self: end;
  width: min(260px, 100%);
  padding: 25px;
  border: 1px solid rgba(143, 77, 49, 0.22);
  border-radius: 20px 20px 20px 5px;
  background: var(--copper-pale);
  box-shadow: 0 16px 40px rgba(143, 77, 49, 0.1);
}
.page-stamp strong { display: block; margin-top: 7px; font-size: 1rem; }
.meta-line { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 12px 28px; margin-top: 28px; color: var(--muted); font-size: 0.8rem; }
.meta-line span::before { content: ""; display: inline-block; width: 6px; height: 6px; margin-right: 9px; border-radius: 50%; background: var(--copper); vertical-align: 1px; }

/* Articles */
.article-shell { width: var(--article-shell); margin: 0 auto; }
.article-layout { display: grid; grid-template-columns: minmax(0, 780px) 260px; justify-content: space-between; gap: 74px; padding: 70px 0 120px; }
.article-cover { margin: 0 0 50px; overflow: hidden; border: 1px solid var(--line); border-radius: 24px 24px 24px 6px; background: white; box-shadow: var(--shadow-soft); }
.article-cover img { display: block; width: 100%; height: auto; }
.article-cover figcaption { padding: 13px 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.78rem; }
.article-body { min-width: 0; color: #233447; font-size: 1rem; }
.article-body > p:first-of-type { color: var(--ink-soft); font-size: 1.06rem; }
.article-body h2 { margin: 46px 0 16px; color: var(--ink); font: 780 clamp(1.32rem, 1.9vw, 1.66rem)/1.32 var(--sans); letter-spacing: -0.025em; }
.article-body h2::before { content: ""; display: block; width: 42px; height: 4px; margin-bottom: 17px; border-radius: 999px; background: var(--copper); }
.article-body h3 { margin: 30px 0 11px; color: var(--ink); font-size: 1.08rem; line-height: 1.35; letter-spacing: -0.02em; }
.article-body p { margin: 0 0 21px; }
.article-body a { color: var(--copper-dark); font-weight: 650; }
.article-body ul,
.article-body ol { margin: 0 0 28px; padding-left: 1.25em; }
.article-body li { margin-bottom: 10px; padding-left: 4px; }
.article-body li::marker { color: var(--copper-dark); font-weight: 800; }
.article-body table { width: 100%; margin: 32px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 15px; border-collapse: separate; border-spacing: 0; background: white; font-size: 0.9rem; }
.article-body th,
.article-body td { padding: 15px 14px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.article-body tr > :last-child { border-right: 0; }
.article-body tbody tr:last-child td { border-bottom: 0; }
.article-body th { color: white; background: var(--ink-soft); font-weight: 720; }
.callout {
  position: relative;
  margin: 32px 0;
  padding: 24px 26px 24px 30px;
  border: 1px solid rgba(18, 104, 95, 0.16);
  border-radius: 17px 17px 17px 5px;
  background: var(--jade-pale);
  box-shadow: 0 13px 35px rgba(18, 104, 95, 0.07);
}
.callout::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 5px; border-radius: 17px 0 0 5px; background: var(--jade); }
.callout.warning { border-color: rgba(190, 112, 72, 0.22); background: var(--copper-pale); }
.callout.warning::before { background: var(--copper); }
.callout strong { color: var(--jade); }
.answer-box,
.direct-answer { margin: 25px 0 36px; padding: 26px; border: 1px solid rgba(190, 112, 72, 0.22); border-radius: 17px 17px 17px 5px; background: var(--copper-pale); font-size: 1rem; }
.source-list { margin-top: 58px; padding: 30px; border: 1px solid var(--line); border-radius: 22px 22px 22px 6px; background: white; }
.source-list h2 { margin-top: 0; font-size: 1.2rem; }
.source-list h2::before { width: 30px; height: 3px; }
.source-list li { word-break: break-word; }
.faq-block { margin-top: 66px; }
.related-reading { min-width: 0; overflow-wrap: anywhere; }
.faq-block details { border-top: 1px solid var(--line-strong); }
.faq-block details:last-child { border-bottom: 1px solid var(--line-strong); }
.faq-block summary { position: relative; cursor: pointer; padding: 21px 44px 21px 0; color: var(--ink); font-weight: 750; list-style: none; }
.faq-block summary::-webkit-details-marker { display: none; }
.faq-block summary::after { content: "+"; position: absolute; right: 7px; top: 16px; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--copper-pale); color: var(--copper-dark); font-size: 1.2rem; }
.faq-block details[open] summary::after { content: "−"; }
.faq-block details p { padding: 0 44px 19px 0; color: var(--muted); }
.toc { position: sticky; top: 112px; align-self: start; padding: 23px 22px; border: 1px solid var(--line); border-radius: 18px 18px 18px 5px; background: rgba(255, 255, 255, 0.72); box-shadow: 0 12px 36px rgba(12, 30, 46, 0.05); backdrop-filter: blur(14px); }
.toc strong { display: block; margin-bottom: 14px; color: var(--copper-dark); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; }
.toc a { display: block; padding: 8px 0; border-bottom: 1px solid var(--line); color: var(--muted); text-decoration: none; font-size: 0.8rem; line-height: 1.35; }
.toc a:last-child { border-bottom: 0; }
.toc a:hover { color: var(--copper-dark); }
.reading-progress { position: fixed; top: 0; left: 0; width: 0; height: 3px; background: linear-gradient(90deg, var(--copper), var(--gold)); z-index: 120; }

/* Indexes */
.index-list { display: grid; gap: 14px; }
.index-item {
  position: relative;
  display: grid;
  grid-template-columns: 96px 1fr auto;
  gap: 28px;
  align-items: center;
  min-height: 164px;
  padding: 26px 34px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px 22px 22px 22px;
  background: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.index-item::after { content: ""; position: absolute; right: -46px; bottom: -86px; width: 170px; height: 170px; border: 1px solid rgba(190, 112, 72, 0.2); border-radius: 50%; }
.index-item:hover { color: var(--ink); border-color: rgba(190, 112, 72, 0.35); transform: translateX(6px); box-shadow: var(--shadow-soft); }
.index-no { color: var(--copper-dark); font: 800 1.85rem/1 var(--sans); letter-spacing: -0.035em; }
.index-item h2 { margin: 0 0 8px; font-size: clamp(1.12rem, 1.5vw, 1.4rem); line-height: 1.32; letter-spacing: -0.02em; }
.index-item p { margin: 0; color: var(--muted); }
.index-item .arrow { position: relative; z-index: 1; color: var(--copper-dark); font-size: 1.35rem; }

/* Homepage reference library */
.home-library {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg) var(--radius-lg) 8px var(--radius-lg);
  background: white;
  box-shadow: var(--shadow-soft);
}
.library-group { min-height: 340px; padding: 34px 30px; }
.library-group + .library-group { border-left: 1px solid var(--line); }
.library-group:nth-child(2) { background: var(--copper-pale); }
.library-group:nth-child(3) { color: white; background: var(--ink); }
.library-group:nth-child(4) { background: var(--jade-pale); }
.library-group .micro { color: var(--copper-dark); }
.library-group:nth-child(3) .micro { color: var(--gold); }
.library-group h3 { margin: 38px 0 18px; font: 780 1.22rem/1.3 var(--sans); letter-spacing: -0.02em; }
.library-group a { display: block; width: fit-content; margin: 10px 0; color: var(--muted); text-decoration: none; font-size: 0.87rem; }
.library-group a::after { content: " ↗"; color: var(--copper-dark); }
.library-group:nth-child(3) a { color: #d5dde5; }
.library-group:nth-child(3) a::after { color: var(--gold); }
.route-board { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 18px; border: 1px solid var(--line); border-radius: 8px 22px 22px 22px; background: rgba(255,255,255,.68); }
.route-board > div { padding: 27px 26px; }
.route-board > div + div { border-left: 1px solid var(--line); }
.route-board strong { display: block; margin-bottom: 15px; font-size: .84rem; }
.route-board a { display: block; margin: 8px 0; color: var(--muted); text-decoration: none; font-size: .8rem; }
.route-board a:hover { color: var(--copper-dark); }
.library-foot { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 26px; }
.library-foot a { color: var(--copper-dark); font-size: .86rem; font-weight: 750; text-decoration: none; }

/* Calculator */
.calculator { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 0.72fr); overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-lg) var(--radius-lg) 8px var(--radius-lg); background: white; box-shadow: var(--shadow-float); }
.calc-form { padding: clamp(32px, 5vw, 58px); }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.field { display: grid; gap: 8px; }
.field label { font-weight: 750; font-size: 0.84rem; }
.field input,
.field select { width: 100%; min-height: 54px; padding: 11px 14px; border: 1px solid var(--line-strong); border-radius: 12px; background: #f6f7f7; transition: border-color 0.2s ease, box-shadow 0.2s ease; }
.field input:focus,
.field select:focus { border-color: var(--jade); outline: 0; box-shadow: 0 0 0 4px rgba(18, 104, 95, 0.1); }
.field small { color: var(--muted); }
.calc-actions { display: flex; gap: 12px; margin-top: 28px; }
.calc-actions button { min-height: 50px; padding: 0 22px; border: 1px solid var(--ink); border-radius: 999px; background: var(--ink); color: white; font-weight: 750; cursor: pointer; }
.calc-actions button:hover { background: var(--copper-dark); border-color: var(--copper-dark); }
.calc-actions button[type="reset"] { color: var(--ink); background: transparent; }
.calc-actions button[type="reset"]:hover { background: var(--canvas); border-color: var(--line-strong); }
.calc-result { position: relative; display: flex; flex-direction: column; justify-content: center; padding: clamp(34px, 5vw, 54px); color: white; background: linear-gradient(145deg, var(--jade), #0b4e49); overflow: hidden; }
.calc-result::after { content: ""; position: absolute; right: -120px; bottom: -130px; width: 300px; height: 300px; border: 1px solid rgba(255, 255, 255, 0.25); border-radius: 50%; box-shadow: 0 0 0 48px rgba(255, 255, 255, 0.035); }
.result-value { position: relative; z-index: 1; margin: 18px 0; color: white; font: 800 clamp(2.1rem, 3.6vw, 3.2rem)/1.05 var(--sans); word-break: break-all; letter-spacing: -0.035em; }
.result-detail { position: relative; z-index: 1; color: #d0e5e1; }
.result-detail.error { color: #ffd7c8; }

/* Legal pages */
.legal-grid { display: grid; grid-template-columns: 230px minmax(0, 780px); justify-content: space-between; gap: 80px; padding: 82px 0 120px; }
.legal-side { position: sticky; top: 118px; align-self: start; padding: 20px; border-left: 3px solid var(--copper); color: var(--muted); font-size: 0.82rem; }
.legal-body { color: #334356; }
.legal-body h2 { margin: 36px 0 13px; color: var(--ink); font-size: 1.28rem; letter-spacing: -0.015em; }
.legal-body h2:first-child { margin-top: 0; }
.legal-body p,
.legal-body li { color: #3d4b5b; }

/* Footer */
.site-footer { position: relative; overflow: hidden; color: white; background: var(--ink); }
.site-footer::before { content: ""; position: absolute; right: -210px; top: -280px; width: 520px; height: 520px; border: 1px solid rgba(216, 181, 107, 0.25); border-radius: 50%; box-shadow: 0 0 0 70px rgba(216, 181, 107, 0.025), 0 0 0 140px rgba(216, 181, 107, 0.018); }
.footer-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.25fr 0.75fr 0.8fr; gap: 64px; padding: 76px 0 64px; }
.footer-brand { font: 800 1.4rem/1 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; }
.footer-copy { max-width: 540px; margin-top: 20px; color: #aeb9c4; font-size: 0.88rem; }
.footer-col strong { display: block; margin-bottom: 18px; color: var(--gold); font-size: 0.69rem; letter-spacing: 0.14em; text-transform: uppercase; }
.footer-col a { display: block; width: fit-content; margin: 9px 0; color: #d7dee5; text-decoration: none; font-size: 0.88rem; }
.footer-col a:hover { color: white; }
.footer-bottom { position: relative; z-index: 1; display: flex; justify-content: space-between; gap: 30px; padding: 20px 0 28px; border-top: 1px solid rgba(255, 255, 255, 0.13); color: #8997a5; font-size: 0.76rem; }

/* Legacy 404 composition */
body:not(.home-page) > main > .hero { min-height: 100vh; display: grid; align-items: center; padding: 56px 0; background: radial-gradient(circle at 80% 20%, rgba(190, 112, 72, 0.18), transparent 23rem); }
body:not(.home-page) .hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(330px, 0.7fr); gap: 30px; align-items: stretch; }
body:not(.home-page) .hero-copy { padding: clamp(44px, 7vw, 90px); border-radius: var(--radius-lg) 8px var(--radius-lg) var(--radius-lg); background: white; box-shadow: var(--shadow-soft); }
body:not(.home-page) .hero h1 { margin: 0; font: 800 clamp(2.2rem, 3.8vw, 3.3rem)/1.12 var(--sans); letter-spacing: -0.04em; }
body:not(.home-page) .hero h1 .zh { display: block; margin-top: 14px; font-size: 0.6em; letter-spacing: -0.03em; }
body:not(.home-page) .hero h1 .signal { color: var(--copper-dark); }
body:not(.home-page) .hero-panel { display: grid; grid-template-rows: auto 1fr; padding: 32px; border-radius: 8px var(--radius-lg) var(--radius-lg) var(--radius-lg); color: white; background: var(--ink); }
.panel-top { display: flex; justify-content: space-between; gap: 20px; padding-bottom: 24px; border-bottom: 1px solid rgba(255, 255, 255, 0.14); }
.panel-live { color: var(--gold); }
.panel-body { display: flex; flex-direction: column; justify-content: center; }
.panel-body h2 { max-width: 340px; margin: 40px 0; font: 760 2rem/1.12 var(--sans); letter-spacing: -0.04em; }
.status-list { margin: 0; }
.status-row { display: grid; grid-template-columns: 1fr auto; gap: 20px; padding: 13px 0; border-top: 1px solid rgba(255, 255, 255, 0.13); }
.status-row dt { color: #aeb9c4; }
.status-row dd { margin: 0; font-weight: 750; }
.status-row .pending { color: var(--gold); }

@media (max-width: 1040px) {
  :root { --shell: min(100% - 40px, 1280px); --article-shell: min(100% - 40px, 1160px); }
  .header-inner { grid-template-columns: 1fr auto auto; min-height: 70px; gap: 12px; }
  .header-state { display: none; }
  .menu-toggle { display: block; justify-self: end; }
  .site-nav { grid-column: 1 / -1; display: grid; padding: 8px; border-radius: 18px; }
  .js .site-nav { display: none; position: absolute; left: 20px; right: 20px; top: 68px; box-shadow: var(--shadow-soft); }
  .js .site-nav[data-open="true"] { display: grid; }
  .site-nav a { justify-content: center; min-height: 48px; }
  .home-hero-grid { grid-template-columns: 1fr; min-height: auto; }
  .home-hero-copy { padding-top: 20px; }
  .hero-sculpture { width: min(680px, 100%); min-height: 540px; margin-inline: auto; }
  .proof-strip-inner { grid-template-columns: 1fr 1fr; }
  .proof-label,
  .proof-item { border-bottom: 1px solid var(--line); }
  .proof-label { padding-left: 24px; }
  .proof-item:nth-child(2) { border-right: 0; }
  .proof-item:nth-last-child(-n+2) { border-bottom: 0; }
  .section-head { grid-template-columns: 1fr; gap: 25px; }
  .article-grid { grid-template-columns: 1fr; }
  .home-library,
  .route-board { grid-template-columns: 1fr 1fr; }
  .library-group:nth-child(3) { border-left: 0; }
  .library-group:nth-child(n+3) { border-top: 1px solid var(--line); }
  .route-board > div:nth-child(3) { border-left: 0; }
  .route-board > div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .feature-card { min-height: 460px; }
  .card-stack { grid-template-columns: 1fr 1fr; grid-template-rows: auto; }
  .method-grid { grid-template-columns: 1fr; }
  .method-item { min-height: 230px; }
  .method-item + .method-item { border-left: 0; border-top: 1px solid rgba(255, 255, 255, 0.13); }
  .method-item:nth-child(2) { margin: 0 24px; transform: none; }
  .method-item:nth-child(3) { padding-top: 42px; }
  .method-item h3,
  .method-item:nth-child(2) h3 { margin-top: 45px; }
  .tool-promo,
  .trust-grid,
  .calculator { grid-template-columns: 1fr; }
  .tool-visual { min-height: 340px; }
  .trust-grid { gap: 42px; }
  .trust-copy { position: static; }
  .page-head-grid { grid-template-columns: 1fr; gap: 35px; }
  .page-stamp { justify-self: start; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { position: static; order: -1; }
  .legal-grid { grid-template-columns: 1fr; gap: 34px; }
  .legal-side { position: static; }
  body:not(.home-page) .hero-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
  :root { --shell: calc(100% - 26px); --article-shell: calc(100% - 26px); }
  body { background: var(--canvas); }
  .brand-word { font-size: 0.84rem; }
  .language-switcher summary { width: 46px; overflow: hidden; padding: 0 11px; color: transparent; }
  .language-switcher summary::before { content: "文"; color: var(--ink); }
  html[lang="en"] .language-switcher summary::before { content: "EN"; }
  html[lang="es"] .language-switcher summary::before { content: "ES"; }
  .language-switcher summary::after { margin-left: 5px; color: var(--copper-dark); }
  .home-hero { padding: 34px 0 52px; }
  .home-hero-grid { gap: 22px; }
  .home-hero h1 { font-size: clamp(1.95rem, 8.2vw, 2.6rem); letter-spacing: -0.045em; }
  .hero-lede { margin-top: 22px; }
  .invite-rail { grid-template-columns: 1fr; gap: 15px; margin-top: 25px; }
  .invite-rail button { width: 100%; }
  .hero-actions { display: grid; }
  .button { width: 100%; }
  .hero-note { grid-template-columns: 1fr; gap: 5px; }
  .hero-sculpture { min-height: 430px; }
  .orbit-field { inset: 12px 8px 12px 0; }
  .orbit-kicker { left: 30px; top: 35px; }
  .orbit-title { left: 30px; top: 70px; width: 210px; font-size: 1.5rem; }
  .orbit-index { right: 25px; top: 34px; }
  .orbit-card { right: 0; bottom: 34px; width: 82%; padding: 20px; }
  .orbit-seal { left: 2px; bottom: 18px; width: 88px; height: 88px; font-size: 0.56rem; }
  .proof-strip-inner { grid-template-columns: 1fr; }
  .proof-label,
  .proof-item { min-height: 62px; padding: 14px 16px; border-right: 0; border-bottom: 1px solid var(--line); }
  .proof-label { padding-left: 16px; }
  .proof-item:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }
  .proof-item:last-child { border-bottom: 0; }
  .section { padding: 56px 0; }
  .section-head { margin-bottom: 34px; }
  .section-head h2 { font-size: clamp(1.7rem, 6.4vw, 2.2rem); }
  .feature-card { min-height: 390px; padding: 27px; }
  .feature-card h3 { font-size: clamp(1.72rem, 6.6vw, 2.25rem); }
  .card-stack { grid-template-columns: 1fr; }
  .small-card { grid-template-columns: 54px 1fr; min-height: 180px; padding: 22px; }
  .small-card .card-arrow { display: none; }
  .home-library,
  .route-board { grid-template-columns: 1fr; }
  .library-group { min-height: 0; }
  .library-group + .library-group,
  .route-board > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .library-group h3 { margin-top: 34px; }
  .library-group a,
  .route-board a,
  .library-foot a,
  .footer-col a,
  .toc a { display: flex; min-height: 44px; align-items: center; margin-block: 0; }
  .method-item { min-height: 250px; padding: 32px 25px; }
  .method-item:nth-child(2) { margin-inline: 12px; }
  .tool-visual { min-height: 290px; padding: 28px; }
  .tool-formula { left: 28px; bottom: 30px; }
  .tool-copy { padding: 36px 24px; }
  .trust-table div { grid-template-columns: 1fr; gap: 6px; }
  .page-head { padding: 66px 0 50px; }
  .page-head h1 { font-size: clamp(1.8rem, 7vw, 2.4rem); }
  .article-layout { padding: 42px 0 88px; gap: 36px; }
  .article-body { font-size: 0.97rem; }
  .article-body h2 { margin-top: 38px; }
  .article-body table { display: block; overflow-x: auto; border-radius: 12px; }
  .callout,
  .direct-answer,
  .answer-box,
  .source-list { padding: 22px 20px 22px 24px; }
  .index-item { grid-template-columns: 54px 1fr; gap: 13px; min-height: 142px; padding: 21px 18px; }
  .index-item .arrow { display: none; }
  .field-grid { grid-template-columns: 1fr; }
  .calc-form,
  .calc-result { padding: 30px 22px; }
  .calc-actions { display: grid; }
  .legal-grid { padding: 55px 0 90px; }
  body:not(.home-page) > main > .hero { padding: 22px 0; }
  body:not(.home-page) .hero-copy,
  body:not(.home-page) .hero-panel { padding: 30px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; padding-top: 58px; }
  .footer-grid > :first-child { grid-column: auto; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}