:root {
  color-scheme: light;
  --page: #eef3f2;
  --paper: #fbfdfb;
  --paper-strong: #ffffff;
  --ink: #122322;
  --muted: #5b6d69;
  --line: #cbd8d5;
  --line-strong: #91a8a2;
  --accent: #087f72;
  --accent-strong: #05584f;
  --accent-soft: #dff4ef;
  --signal: #d8ff49;
  --warning: #b04b2d;
  --warning-soft: #fff0e9;
  --shadow: 0 18px 48px rgba(21, 52, 48, .1);
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 28px;
  --display: "STZhongsong", "Songti SC", "Noto Serif CJK SC", serif;
  --body: "LXGW WenKai", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}

body[data-theme="ledger"] {
  --page: #f2eee4;
  --paper: #fbf8ef;
  --paper-strong: #fffdf7;
  --ink: #211e18;
  --muted: #6e6658;
  --line: #d6cbb7;
  --line-strong: #a99a7f;
  --accent: #9a4f16;
  --accent-strong: #63300b;
  --accent-soft: #f7e3cc;
  --signal: #ffc84a;
  --warning: #9c3029;
  --warning-soft: #fbe8df;
  --shadow: 0 18px 48px rgba(68, 48, 18, .11);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 49.85%, rgba(50, 91, 83, .045) 50%, transparent 50.15%) 0 0 / 44px 44px,
    linear-gradient(transparent 49.85%, rgba(50, 91, 83, .045) 50%, transparent 50.15%) 0 0 / 44px 44px,
    var(--page);
  font-family: var(--body);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

body[data-theme="ledger"] {
  background:
    repeating-linear-gradient(0deg, rgba(92, 71, 34, .035) 0, rgba(92, 71, 34, .035) 1px, transparent 1px, transparent 26px),
    radial-gradient(circle at 82% 2%, rgba(255, 200, 74, .16), transparent 24rem),
    var(--page);
}

button,
input,
select {
  font: inherit;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  color: #fff;
  background: var(--accent-strong);
  border-radius: var(--radius-sm);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.utility-header {
  position: sticky;
  z-index: 30;
  top: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(16px);
}

.header-inner,
.page-shell {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: .02em;
}

.brand-mark {
  position: relative;
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  border: 2px solid var(--ink);
  border-radius: 50% 50% 48% 12%;
  background: var(--signal);
  transform: rotate(-8deg);
}

.brand-mark::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  right: 5px;
  bottom: 5px;
  border-radius: 50%;
  background: var(--ink);
}

.utility-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.utility-nav a {
  padding: 7px 10px;
  color: var(--muted);
  border-radius: 999px;
  font-size: 14px;
  text-decoration: none;
}

.utility-nav a:hover,
.utility-nav a:focus-visible {
  color: var(--ink);
  background: var(--accent-soft);
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--accent-strong);
  background: var(--paper-strong);
  font: 700 12px/1 var(--mono);
}

.status-chip::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent-soft) 86%, transparent);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
  gap: clamp(36px, 7vw, 90px);
  padding: clamp(64px, 9vw, 120px) 0 58px;
}

.hero::before {
  content: attr(data-index);
  position: absolute;
  top: 32px;
  right: 0;
  color: color-mix(in srgb, var(--accent) 14%, transparent);
  font: 900 clamp(90px, 16vw, 190px)/1 var(--mono);
  letter-spacing: -.09em;
  pointer-events: none;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--accent-strong);
  font: 800 13px/1.2 var(--mono);
  letter-spacing: .13em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--accent);
}

.hero h1 {
  max-width: 820px;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(38px, 6.2vw, 76px);
  font-weight: 900;
  line-height: 1.07;
  letter-spacing: -.055em;
}

.hero-lead {
  max-width: 730px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 2vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 18px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--paper-strong);
  background: var(--ink);
  box-shadow: none;
  cursor: pointer;
  font-weight: 800;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 18px color-mix(in srgb, var(--ink) 18%, transparent);
}

.button:active {
  transform: translateY(0);
}

.button.secondary {
  color: var(--ink);
  background: transparent;
  border-color: var(--line-strong);
}

.button.signal {
  color: var(--ink);
  background: var(--signal);
}

.button.small {
  min-height: 38px;
  padding: 8px 13px;
  font-size: 14px;
}

.button:focus-visible,
.choice:focus-within,
select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 38%, transparent);
  outline-offset: 3px;
}

.hero-aside {
  align-self: end;
  position: relative;
  padding: 24px 0 0 26px;
  border-left: 2px solid var(--ink);
}

.hero-aside::before {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  left: -8px;
  top: -3px;
  border: 2px solid var(--ink);
  background: var(--signal);
  transform: rotate(45deg);
}

.hero-aside h2 {
  margin: 0 0 16px;
  font: 900 15px/1.4 var(--mono);
  letter-spacing: .06em;
}

.hero-aside ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: item;
}

.hero-aside li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 10px;
  align-items: start;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.hero-aside li::before {
  counter-increment: item;
  content: "0" counter(item);
  color: var(--accent);
  font: 800 12px/1.7 var(--mono);
}

.trust-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 52px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.trust-band > div {
  min-height: 112px;
  padding: 22px;
  border-right: 1px solid var(--line);
}

.trust-band > div:last-child {
  border-right: 0;
}

.trust-band strong {
  display: block;
  margin-bottom: 7px;
  font-family: var(--display);
  font-size: 20px;
}

.trust-band span {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

.workbench {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 30px;
  align-items: start;
  margin-bottom: 72px;
}

.step-rail {
  position: sticky;
  top: 98px;
  padding: 8px 0;
}

.step-rail h2 {
  margin: 0 0 18px;
  font: 900 13px/1.3 var(--mono);
  letter-spacing: .11em;
  text-transform: uppercase;
}

.rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.rail-list li {
  position: relative;
  min-height: 58px;
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  align-items: start;
  color: var(--muted);
}

.rail-list li:not(:last-child)::after {
  content: "";
  position: absolute;
  width: 1px;
  top: 25px;
  bottom: 5px;
  left: 12px;
  background: var(--line-strong);
}

.rail-number {
  position: relative;
  z-index: 1;
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--page);
  font: 800 11px/1 var(--mono);
}

.rail-list strong {
  display: block;
  margin: 2px 0 2px;
  color: var(--ink);
  font-size: 14px;
}

.rail-list small {
  display: block;
  line-height: 1.45;
}

.privacy-note {
  margin: 18px 0 0;
  padding: 14px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: color-mix(in srgb, var(--paper) 66%, transparent);
  font-size: 13px;
}

.tool-panel {
  min-width: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--paper-strong);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.tool-panel-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 30px;
  color: var(--paper-strong);
  background: var(--ink);
}

.tool-panel-head h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(25px, 3vw, 38px);
  line-height: 1.15;
}

.tool-panel-head p {
  max-width: 450px;
  margin: 0;
  color: color-mix(in srgb, var(--paper-strong) 70%, transparent);
  font-size: 14px;
}

.tool-progress {
  flex: 0 0 auto;
  padding: 7px 11px;
  border: 1px solid rgba(255, 255, 255, .3);
  border-radius: 999px;
  font: 800 12px/1 var(--mono);
}

.tool-form {
  padding: 8px 30px 32px;
}

.question-block {
  margin: 0;
  padding: 28px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
}

.question-block legend {
  width: 100%;
  padding: 0;
  font-family: var(--display);
  font-size: 23px;
  font-weight: 900;
  line-height: 1.3;
}

.question-hint {
  margin: 8px 0 17px;
  color: var(--muted);
  font-size: 14px;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.choice {
  min-height: 76px;
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  align-items: start;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  cursor: pointer;
  transition: border-color .18s ease, transform .18s ease, background .18s ease;
}

.choice:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.choice:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 4px 0 0 var(--accent);
}

.choice input {
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  accent-color: var(--accent);
}

.choice strong {
  display: block;
  margin-bottom: 3px;
  line-height: 1.35;
}

.choice small {
  display: block;
  color: var(--muted);
  line-height: 1.45;
}

.alert-block {
  margin: 24px 0 0;
  padding: 20px;
  border: 1px solid color-mix(in srgb, var(--warning) 48%, var(--line));
  border-radius: var(--radius);
  background: var(--warning-soft);
}

.alert-block h3 {
  margin: 0 0 6px;
  font-family: var(--display);
  font-size: 20px;
}

.alert-block p {
  margin: 0 0 13px;
  color: var(--muted);
  font-size: 14px;
}

.alert-options {
  display: grid;
  gap: 8px;
}

.alert-options label {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  font-weight: 700;
}

.alert-options input {
  width: 17px;
  height: 17px;
  margin-top: 4px;
  accent-color: var(--warning);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 26px;
}

.form-message {
  min-height: 25px;
  margin: 15px 0 0;
  color: var(--warning);
  font-weight: 700;
}

.result-panel {
  margin: 0 30px 32px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper);
  overflow: hidden;
}

.result-panel[hidden] {
  display: none;
}

.result-head {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 22px;
  align-items: center;
  padding: 25px;
  border-bottom: 1px solid var(--line);
}

.result-score {
  width: 92px;
  height: 92px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--signal);
  font: 900 28px/1 var(--mono);
}

.result-head h3 {
  margin: 0 0 5px;
  font-family: var(--display);
  font-size: 28px;
}

.result-head p {
  margin: 0;
  color: var(--muted);
}

.result-body {
  padding: 22px 25px;
}

.result-body h4 {
  margin: 0 0 9px;
  font: 900 13px/1.4 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.result-list {
  margin: 0;
  padding-left: 21px;
}

.result-list li {
  margin: 8px 0;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 20px;
}

.method-section {
  margin: 0 0 74px;
  padding: clamp(26px, 5vw, 52px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--paper);
}

.method-header {
  display: grid;
  grid-template-columns: .7fr 1.3fr;
  gap: 44px;
  align-items: start;
  margin-bottom: 36px;
}

.method-header h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.12;
}

.method-header p {
  margin: 0;
  color: var(--muted);
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.method-grid article {
  min-width: 0;
  padding: 22px;
  background: var(--paper-strong);
}

.method-grid .number {
  color: var(--accent);
  font: 800 12px/1 var(--mono);
}

.method-grid h3 {
  margin: 13px 0 8px;
  font-family: var(--display);
  font-size: 21px;
}

.method-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.faq-section {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 40px;
  margin-bottom: 72px;
}

.faq-section > h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 34px;
  line-height: 1.2;
}

.faq-list details {
  border-top: 1px solid var(--line-strong);
}

.faq-list details:last-child {
  border-bottom: 1px solid var(--line-strong);
}

.faq-list summary {
  position: relative;
  padding: 20px 42px 20px 0;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  top: 17px;
  right: 5px;
  color: var(--accent);
  font: 500 26px/1 var(--mono);
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list p {
  margin: -6px 0 20px;
  color: var(--muted);
}

.ledger-setup {
  display: grid;
  grid-template-columns: minmax(180px, .8fr) minmax(0, 1.2fr);
  gap: 18px;
  align-items: end;
  padding: 26px 30px 20px;
  border-bottom: 1px solid var(--line);
}

.field-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font: 800 12px/1.3 var(--mono);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.select-control {
  width: 100%;
  min-height: 46px;
  padding: 10px 38px 10px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--ink);
  background: var(--paper-strong);
}

.ledger-setup p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.ledger-wrap {
  overflow: clip;
}

.ledger-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.ledger-table th,
.ledger-table td {
  padding: 15px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.ledger-table th {
  color: var(--muted);
  background: color-mix(in srgb, var(--accent-soft) 58%, var(--paper));
  font: 800 11px/1.3 var(--mono);
  letter-spacing: .05em;
  text-transform: uppercase;
}

.ledger-table th:nth-child(1) {
  width: 17%;
}

.ledger-table th:nth-child(2) {
  width: 19%;
}

.ledger-table th:nth-child(3) {
  width: 40%;
}

.ledger-table th:nth-child(4) {
  width: 24%;
}

.ledger-field {
  display: block;
  margin-top: 4px;
  color: var(--accent-strong);
  font: 700 11px/1.35 var(--mono);
  overflow-wrap: anywhere;
}

.phase-label {
  display: inline-flex;
  padding: 4px 7px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  font: 700 11px/1 var(--mono);
}

.ledger-table td {
  color: var(--muted);
  font-size: 13px;
}

.ledger-table td:first-child {
  color: var(--ink);
  font-weight: 800;
}

.ledger-table .select-control {
  min-height: 39px;
  padding-block: 7px;
  font-size: 13px;
}

.utility-footer {
  padding: 34px 0 42px;
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
}

.footer-grid p {
  max-width: 760px;
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links a {
  text-underline-offset: 3px;
}

[data-reveal] {
  animation: reveal .62s cubic-bezier(.2, .75, .25, 1) both;
}

[data-reveal="2"] {
  animation-delay: .08s;
}

[data-reveal="3"] {
  animation-delay: .16s;
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 860px) {
  .hero,
  .method-header {
    grid-template-columns: 1fr;
  }

  .hero-aside {
    max-width: 560px;
  }

  .trust-band {
    grid-template-columns: 1fr;
  }

  .trust-band > div {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .trust-band > div:last-child {
    border-bottom: 0;
  }

  .workbench {
    grid-template-columns: 1fr;
  }

  .step-rail {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }

  .step-rail h2 {
    grid-column: 1 / -1;
    margin-bottom: 0;
  }

  .privacy-note {
    margin: 0;
  }

  .method-grid {
    grid-template-columns: 1fr;
  }

  .faq-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .header-inner,
  .page-shell {
    width: min(100% - 28px, 1180px);
  }

  .header-inner {
    min-height: 62px;
  }

  .utility-nav a:not(.status-chip) {
    display: none;
  }

  .status-chip {
    margin-left: 0;
  }

  .hero {
    padding-top: 54px;
  }

  .hero::before {
    top: 24px;
    font-size: 94px;
  }

  .hero h1 {
    font-size: clamp(36px, 12vw, 54px);
  }

  .hero-actions .button {
    width: 100%;
  }

  .step-rail {
    grid-template-columns: 1fr;
  }

  .rail-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 7px;
  }

  .rail-list li {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .rail-list li::after,
  .rail-list small {
    display: none;
  }

  .tool-panel {
    border-radius: 20px;
  }

  .tool-panel-head {
    display: grid;
    padding: 23px 18px;
  }

  .tool-form {
    padding: 4px 18px 24px;
  }

  .choice-grid {
    grid-template-columns: 1fr;
  }

  .result-panel {
    margin: 0 18px 24px;
  }

  .result-head {
    grid-template-columns: 72px 1fr;
    gap: 14px;
    padding: 19px;
  }

  .result-score {
    width: 68px;
    height: 68px;
    font-size: 20px;
  }

  .result-head h3 {
    font-size: 23px;
  }

  .result-body {
    padding: 19px;
  }

  .method-section {
    padding: 24px 18px;
  }

  .ledger-setup {
    grid-template-columns: 1fr;
    padding: 22px 18px;
  }

  .ledger-table,
  .ledger-table tbody,
  .ledger-table tr,
  .ledger-table td {
    display: block;
    width: 100%;
  }

  .ledger-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .ledger-table tr {
    padding: 18px;
    border-bottom: 1px solid var(--line-strong);
  }

  .ledger-table td {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 10px;
    padding: 7px 0;
    border: 0;
  }

  .ledger-table td::before {
    content: attr(data-label);
    color: var(--muted);
    font: 800 10px/1.45 var(--mono);
    letter-spacing: .04em;
    text-transform: uppercase;
  }

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

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

@media print {
  .utility-header,
  .hero-actions,
  .form-actions,
  .result-actions,
  .utility-footer {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .page-shell {
    width: 100%;
  }

  .hero {
    padding: 20px 0;
  }

  .workbench {
    display: block;
  }

  .step-rail {
    display: none;
  }

  .tool-panel,
  .method-section {
    box-shadow: none;
  }
}