/* 明账 Ledgerlight — static site, no external dependencies */
:root {
  --ink: #12323a;
  --ink-2: #1a4550;
  --teal: #1e6b62;
  --teal-hover: #17564f;
  --brass: #b07d2e;
  --brass-soft: #e8d4a8;
  --paper: #f6f3ec;
  --paper-2: #ebe6da;
  --cream: #fffcf7;
  --text: #1b2a2e;
  --muted: #5c6a6e;
  --line: #d8d2c6;
  --focus: #1e6b62;
  --header-h: 4.35rem;
  --wrap: 70rem;
  --radius: 14px;
  --shadow: 0 14px 40px rgba(18, 50, 58, 0.08);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", Palatino, "Palatino Linotype", Georgia, serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html[lang="en"] [data-lang="zh"] { display: none !important; }
html:not([lang="en"]) [data-lang="en"] { display: none !important; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--paper);
  min-height: 100vh;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--teal); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--teal-hover); }
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 0.8rem;
  top: -4rem;
  background: var(--ink);
  color: var(--cream);
  padding: 0.5rem 0.8rem;
  z-index: 100;
  border-radius: 0 0 8px 8px;
}
.skip:focus { top: 0; }

.wrap {
  width: min(calc(100% - 2.4rem), var(--wrap));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--cream) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  min-height: var(--header-h);
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--ink);
  flex: 0 0 auto;
}
.logo img { width: 2.15rem; height: 2.15rem; }
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-zh { font-family: var(--font-serif); font-size: 1.15rem; font-weight: 600; letter-spacing: 0.04em; }
.logo-en { font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-top: 0.12rem; }

.nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  margin-left: 0.6rem;
  flex: 1 1 auto;
}
.nav a {
  color: var(--ink);
  text-decoration: none;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  font-size: 0.95rem;
}
.nav a:hover,
.nav a[aria-current="page"] { background: var(--paper-2); color: var(--ink); }

.nav-item { position: relative; }
.nav-item > button {
  background: none;
  border: 0;
  font: inherit;
  color: var(--ink);
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.nav-item > button:hover,
.nav-item:focus-within > button { background: var(--paper-2); }
.nav-item > button::after {
  content: "";
  width: 0.35rem;
  height: 0.35rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
}
.dropdown {
  display: none;
  position: absolute;
  top: calc(100% - 0.1rem);
  left: 0;
  min-width: 14rem;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 0.4rem;
  z-index: 20;
}
.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown { display: grid; }
.dropdown a { display: block; padding: 0.55rem 0.7rem; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-left: auto;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--cream);
}
.lang-switch button {
  font: inherit;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0.32rem 0.7rem;
  cursor: pointer;
}
.lang-switch button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--cream);
}
.menu-toggle {
  display: none;
  width: 2.4rem;
  height: 2.4rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--cream);
  cursor: pointer;
  padding: 0;
}
.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  display: block;
  width: 1rem;
  height: 1.5px;
  background: var(--ink);
  margin: 0 auto;
  position: relative;
  content: "";
}
.menu-toggle span::before { position: absolute; top: -5px; }
.menu-toggle span::after { position: absolute; top: 5px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  font: inherit;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  line-height: 1.2;
}
.btn-primary {
  background: var(--teal);
  color: #fff;
  border-color: var(--teal);
}
.btn-primary:hover { background: var(--teal-hover); color: #fff; border-color: var(--teal-hover); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { background: var(--paper-2); color: var(--ink); }
.header-actions .btn-primary { padding: 0.52rem 0.95rem; font-size: 0.88rem; }

/* Hero */
.hero {
  padding: 4.2rem 0 3.4rem;
  background:
    linear-gradient(180deg, var(--cream) 0%, var(--paper) 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 27px,
    color-mix(in srgb, var(--line) 70%, transparent) 28px
  );
  mask-image: linear-gradient(90deg, transparent 0, #000 12%, #000 55%, transparent 88%);
  opacity: 0.45;
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.9fr);
  gap: 2.6rem;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  color: var(--brass);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 600;
  margin: 0 0 0.9rem;
}
h1, h2, h3 { font-family: var(--font-serif); font-weight: 600; color: var(--ink); letter-spacing: 0.01em; }
.hero h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.35rem);
  line-height: 1.2;
  margin: 0 0 1rem;
}
.lede, .hero .lede {
  font-size: 1.08rem;
  color: var(--muted);
  margin: 0 0 1.6rem;
  max-width: 40rem;
}
.hero-actions, .cta-row { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.hero-visual {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 0.7rem;
}
.hero-visual figcaption,
.figure-caption {
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.55rem;
}

/* Sections */
.section { padding: 3.4rem 0; }
.section-alt { background: var(--cream); }
.section h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  margin: 0 0 0.5rem;
}
.section-intro { color: var(--muted); margin: 0 0 1.8rem; max-width: 42rem; }
.page-hero { padding: 3rem 0 1.6rem; }
.page-hero h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.7rem);
  margin: 0 0 0.8rem;
  line-height: 1.25;
}

/* Value cards */
.grid-4, .grid-2, .steps, .info-list { display: grid; gap: 1rem; }
.grid-4 { grid-template-columns: repeat(2, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); gap: 1.2rem; }
.card {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.3rem 1.4rem;
  box-shadow: 0 1px 0 rgba(255,255,255,0.7) inset;
}
.card h3 { margin: 0 0 0.5rem; font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); }
.card.service-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 1.7rem 1.55rem;
  border-top: 3px solid var(--brass);
}
.card.service-card h3 { font-size: 1.4rem; }
.card.service-card p { flex: 1 1 auto; margin-bottom: 1.1rem; }
.card-kicker {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0 0 0.45rem;
  font-weight: 600;
}
.value-card--report { grid-column: auto; }
.value-card--report .mini-diagram { margin-top: 1rem; border-radius: 10px; overflow: hidden; border: 1px solid var(--line); }

/* Steps */
.steps { grid-template-columns: repeat(5, 1fr); counter-reset: step; }
.step {
  position: relative;
  padding: 1.2rem 1rem 1.3rem;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  display: block;
  font-family: var(--font-serif);
  color: var(--brass);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.45rem;
}
.step p { margin: 0; font-size: 0.95rem; color: var(--text); }

/* Boundary */
.boundary {
  border: 1px solid var(--line);
  border-left: 3px solid var(--brass);
  background: color-mix(in srgb, var(--paper-2) 70%, var(--cream));
  border-radius: 10px;
  padding: 1rem 1.15rem;
  color: var(--text);
  font-size: 0.95rem;
}
.boundary p { margin: 0; }

/* Lists */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.panel {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.4rem;
}
.panel h2 { font-size: 1.25rem; margin: 0 0 0.9rem; }
.panel ul, .prose ul { margin: 0; padding: 0 0 0 1.1rem; }
.panel li, .prose li { margin: 0.35rem 0; }
.systems {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-top: 1rem;
}
.system-pill {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  text-align: center;
  font-weight: 600;
  color: var(--ink);
}
.system-pill span { display: block; font-weight: 400; color: var(--muted); font-size: 0.85rem; margin-top: 0.2rem; }

.diagram-block {
  margin-top: 1.4rem;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1rem 1rem 1.15rem;
}
.diagram-block h2 { margin-bottom: 0.6rem; }
.diagram-note { color: var(--muted); margin: 0 0 1rem; }
.badge-sample {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  border: 1px solid var(--brass-soft);
  color: #7a5620;
  background: #f8efdc;
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  margin: 0 0 0.7rem;
}

/* CTA band */
.cta-band {
  background: var(--ink);
  color: var(--cream);
  padding: 3rem 0;
}
.cta-band h2, .cta-band p { color: var(--cream); }
.cta-band p { color: color-mix(in srgb, var(--cream) 80%, #9ab); margin: 0 0 1.2rem; max-width: 40rem; }
.cta-band .btn-primary { background: var(--brass); border-color: var(--brass); color: #1b160c; }
.cta-band .btn-primary:hover { background: #c4923f; border-color: #c4923f; color: #1b160c; }
.cta-band .btn-ghost { color: var(--cream); border-color: color-mix(in srgb, var(--cream) 35%, transparent); }
.cta-band .btn-ghost:hover { background: color-mix(in srgb, #fff 12%, transparent); color: var(--cream); }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 1.4rem;
  align-items: start;
}
.info-list { gap: 0.55rem; }
.info-list div {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.6rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
}
.info-list dt { color: var(--muted); font-size: 0.9rem; margin: 0; }
.info-list dd { margin: 0; }
.form {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
}
.form .field { margin: 0 0 0.9rem; }
.form label { display: block; font-size: 0.9rem; margin-bottom: 0.3rem; color: var(--ink); }
.form input,
.form select,
.form textarea {
  width: 100%;
  font: inherit;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--text);
}
.form textarea { min-height: 7.5rem; resize: vertical; }
.form .btn { width: 100%; border: 0; }
.mailto-fallback { margin: 0.8rem 0 0; font-size: 0.9rem; color: var(--muted); }

/* About facts */
.facts {
  margin: 1.4rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 0.3rem 0;
}
.facts div {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 0.7rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}
.facts div:last-child { border-bottom: 0; }
.facts dt { margin: 0; color: var(--muted); }

.prose p { margin: 0 0 1rem; max-width: 44rem; }
.section .prose h2 {
  font-size: 1.25rem;
  margin: 1.75rem 0 0.55rem;
  max-width: 44rem;
}

.member-line {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  margin: 0 0 1.2rem;
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: color-mix(in srgb, var(--cream) 82%, #89a);
  padding: 2.6rem 0 1.6rem;
  font-size: 0.92rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr;
  gap: 2rem;
}
.site-footer h3 {
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 0.7rem;
}
.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--cream);
  margin: 0 0 0.5rem;
}
.site-footer a { color: var(--brass-soft); text-decoration: none; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0.3rem 0; }
.footer-legal { margin-top: 0.8rem; }
.footer-legal > div, .footer-legal > p { margin: 0.35rem 0 0; }
.footer-legal a { word-break: break-word; }
.footer-boundary {
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid color-mix(in srgb, var(--cream) 16%, transparent);
  font-size: 0.85rem;
  color: color-mix(in srgb, var(--cream) 70%, #89a);
}
.footer-copy { margin-top: 0.8rem; font-size: 0.8rem; opacity: 0.75; }

/* Privacy placeholder */
.placeholder-note {
  background: var(--cream);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
}

@media (max-width: 980px) {
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .hero-grid, .contact-grid, .split, .footer-grid { grid-template-columns: 1fr; }
  .footer-grid { gap: 1.4rem; }
}

@media (max-width: 860px) {
  .header-inner {
    display: grid;
    grid-template-columns: 1fr auto auto;
    grid-template-areas:
      "logo lang menu"
      "cta cta cta";
    align-items: center;
    gap: 0.5rem 0.55rem;
    min-height: 0;
    padding-block: 0.65rem;
  }
  .logo { grid-area: logo; }
  .header-actions { display: contents; }
  .header-actions .btn-primary {
    grid-area: cta;
    width: 100%;
    white-space: nowrap;
    padding: 0.55rem 0.9rem;
    font-size: 0.9rem;
  }
  .lang-switch { grid-area: lang; }
  .menu-toggle {
    grid-area: menu;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    background: var(--cream);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 0.6rem 1.2rem 1rem;
    box-shadow: var(--shadow);
  }
  .nav.is-open { display: flex; }
  .nav-item > button { width: 100%; justify-content: space-between; }
  .dropdown, .nav-item:hover .dropdown, .nav-item:focus-within .dropdown {
    display: grid;
    position: static;
    border: 0;
    box-shadow: none;
    padding: 0 0 0.4rem 0.6rem;
    background: transparent;
  }
  .hero { padding: 2.4rem 0 2rem; }
  .section { padding: 2.4rem 0; }
}

@media (max-width: 640px) {
  body { font-size: 1rem; }
  .wrap { width: min(calc(100% - 1.5rem), var(--wrap)); }
  .grid-4, .grid-2, .steps, .systems, .split { grid-template-columns: 1fr; }
  .header-actions .btn-primary { padding: 0.45rem 0.7rem; font-size: 0.82rem; }
  .info-list div, .facts div { grid-template-columns: 1fr; gap: 0.15rem; }
  .lang-switch button { padding: 0.3rem 0.5rem; }
}

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

/* v0.4-pre additions */
.copy-pending {
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
h1.copy-pending,
h2.copy-pending,
p.copy-pending,
li.copy-pending,
article.copy-pending {
  background: color-mix(in srgb, #f8efdc 78%, var(--cream));
  outline: 1px dashed var(--brass);
  outline-offset: 3px;
  border-radius: 6px;
}
.copy-mark {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72em;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #7a5620;
  background: #f8efdc;
  border: 1px solid var(--brass-soft);
  border-radius: 999px;
  padding: 0.05rem 0.45rem;
  margin-right: 0.4rem;
  vertical-align: middle;
  font-style: normal;
}
h1 .copy-mark, h2 .copy-mark { font-size: 0.45em; transform: translateY(-0.15em); }

.badge-support,
.badge-nz,
.badge-remote {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  border-radius: 999px;
  padding: 0.18rem 0.65rem;
  margin: 0 0.35rem 0.55rem 0;
  font-weight: 600;
}
.badge-support {
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--paper-2);
}
.badge-nz {
  border: 1px solid var(--brass-soft);
  color: #7a5620;
  background: #f8efdc;
}
.badge-remote {
  border: 1px solid color-mix(in srgb, var(--teal) 35%, var(--line));
  color: var(--teal);
  background: color-mix(in srgb, var(--teal) 8%, var(--cream));
}
.badge-row { margin: 0 0 0.8rem; }

.grid-services {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.service-card--support {
  border-top-color: var(--muted);
  grid-column: 1 / -1;
}
.service-card .badge-row { margin-bottom: 0.65rem; }

.dropdown { min-width: 17.5rem; }

.structural-note {
  color: var(--text);
  margin: 0 0 1.2rem;
  max-width: 46rem;
}
.caveat {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0.8rem 0 0;
  max-width: 46rem;
}

.hero-visual img, .hero-visual svg { width: 100%; height: auto; border-radius: 12px; }

.demo-caption {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.7rem 0 0;
}
.demo-frame {
  margin-top: 1rem;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 0.85rem 0.85rem 1rem;
}
.demo-frame img, .demo-frame svg { width: 100%; height: auto; border-radius: 10px; }

.footer-grid {
  grid-template-columns: 1.4fr 0.7fr 1fr;
}

.contact-extra {
  margin-top: 0.85rem;
  color: var(--text);
}
.contact-extra p { margin: 0.25rem 0 0; }

@media (max-width: 980px) {
  .grid-services { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .grid-services { grid-template-columns: 1fr; }
  .service-card--support { grid-column: auto; }
}

/* v0.5 additions */
.consent-note {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0.85rem 0 0;
  max-width: 46rem;
}
.contact-note {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0.4rem 0 0;
  font-weight: 400;
  line-height: 1.55;
}
.info-list dd .contact-note { max-width: none; }
.form .field-legend {
  display: block;
  font-size: 0.9rem;
  margin: 0 0 0.4rem;
  color: var(--ink);
}
.radio-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.3rem;
}
.radio-row label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink);
  cursor: pointer;
}
.form input[type="radio"] {
  width: auto;
  margin: 0;
  accent-color: var(--teal);
  padding: 0;
}