/* 脈アリ codex-v2 — DESIGN.md v2 に基づく比較用の別解 */

:root {
  --content-max: calc(
    var(--space-3xl) + var(--space-3xl) + var(--space-3xl) +
    var(--space-3xl) + var(--space-3xl) + var(--space-3xl) +
    var(--space-3xl) + var(--space-3xl) + var(--space-3xl) +
    var(--space-3xl) + var(--space-3xl) + var(--space-lg)
  );
  --header-height: var(--space-2xl);
  --control-min: calc(var(--space-xl) + var(--space-2xs));
  --brand-mark-width: calc(var(--space-xl) + var(--space-xs));
  --hero-mark-max: calc(var(--space-3xl) + var(--space-3xl) + var(--space-3xl));
  --measure-body: 65ch;
  --measure-heading: 22ch;
  --measure-hero: 16ch;
  --font-weight-body: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --motif-field-opacity: 0.1;
  --motif-footer-opacity: 0.14;
  --motif-red-opacity: 0.55;
  --motif-step-opacity: 0.2;
  --opacity-none: 0;
  --opacity-full: 1;
  --footer-copy-opacity: 0.72;
  --line-width: var(--space-3xs);
  --node-width: calc(var(--space-xs) + var(--space-2xs));
  --node-width-small: var(--space-xs);
}

@supports not (color: oklch(0% 0 0)) {
  :root {
    --color-paper: #ffffff;
    --color-paper-2: #f1f3f8;
    --color-paper-3: #e4e8ef;
    --color-ink: #1e253f;
    --color-ink-2: #434a5e;
    --color-rule: #d1d4db;
    --color-muted: #636976;
    --color-accent: #212a53;
    --color-accent-ink: #ffffff;
    --color-brand-red: #c52c26;
    --color-focus: #384ca2;
    --color-scrim: #1e253f73;
  }
}

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

html {
  scroll-padding-top: calc(var(--header-height) + var(--space-md));
}

body {
  margin: 0;
  overflow-x: hidden;
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-weight-body);
  line-height: var(--leading-body);
  letter-spacing: var(--tracking-body);
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
p,
dl,
dd,
figure,
ol,
ul {
  margin: 0;
}

ol,
ul {
  padding: 0;
}

h1,
h2,
h3 {
  max-width: var(--measure-heading);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-style: normal;
  font-weight: var(--font-weight-bold);
  overflow-wrap: anywhere;
}

h1 {
  font-size: var(--text-display);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
}

h2 {
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

h3 {
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

p {
  max-width: var(--measure-body);
}

a {
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

:focus-visible {
  outline: var(--line-width) solid var(--color-focus);
  outline-offset: var(--space-2xs);
  border-radius: var(--radius-input);
}

.shell,
.header-inner {
  width: min(100%, var(--content-max));
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.skip-link {
  position: fixed;
  z-index: 20;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  display: inline-flex;
  align-items: center;
  min-height: var(--control-min);
  padding-inline: var(--space-md);
  border: var(--rule-hairline);
  border-radius: var(--radius-input);
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--tracking-ui);
  opacity: var(--opacity-none);
  pointer-events: none;
}

.skip-link:focus-visible {
  opacity: var(--opacity-full);
  pointer-events: auto;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--control-min);
  min-height: var(--control-min);
  padding: var(--space-sm) var(--space-lg);
  border: var(--rule-hairline);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-label);
  letter-spacing: var(--tracking-ui);
  text-align: center;
  text-decoration: none;
}

.button:hover {
  text-decoration: underline;
  text-underline-offset: var(--space-2xs);
}

.button--primary {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.button--inverse {
  border-color: var(--color-accent-ink);
  background-color: var(--color-accent-ink);
  color: var(--color-accent);
}

/* Header */
.site-header {
  position: relative;
  z-index: 10;
  border-block-end: var(--rule-hairline);
  background-color: var(--color-paper);
}

.nav-ready .site-header {
  position: sticky;
  inset-block-start: 0;
}

.header-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  min-height: var(--header-height);
  gap: var(--space-sm) var(--space-md);
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  min-height: var(--control-min);
  gap: var(--space-xs);
  color: var(--color-ink);
  text-decoration: none;
}

.brand__mark {
  width: var(--brand-mark-width);
  height: auto;
}

.brand__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  place-items: center;
  width: var(--control-min);
  min-height: var(--control-min);
  padding: var(--space-sm);
  border: var(--rule-hairline);
  border-radius: var(--radius-pill);
  background-color: var(--color-paper);
  cursor: pointer;
}

.nav-toggle__icon,
.nav-toggle__icon::before,
.nav-toggle__icon::after {
  width: var(--space-lg);
  height: var(--line-width);
  background-color: var(--color-ink);
}

.nav-toggle__icon {
  position: relative;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  position: absolute;
  inset-inline-start: 0;
  content: "";
}

.nav-toggle__icon::before {
  inset-block-end: var(--space-xs);
}

.nav-toggle__icon::after {
  inset-block-start: var(--space-xs);
}

.header-panel {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-md);
  padding-block-end: var(--space-lg);
}

.site-nav__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  list-style: none;
}

.site-nav__list a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: var(--control-min);
  min-height: var(--control-min);
  padding-inline: var(--space-xs);
  border-block-end: var(--rule-hairline);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-label);
  letter-spacing: var(--tracking-ui);
  text-decoration: none;
}

.site-nav__list a:hover {
  text-decoration: underline;
  text-underline-offset: var(--space-2xs);
}

.header-cta {
  width: 100%;
}

.nav-ready .nav-toggle {
  display: grid;
}

.nav-ready .header-panel {
  display: none;
}

.nav-ready .header-panel.is-open {
  display: flex;
  max-height: calc(100vh - var(--header-height));
  max-height: calc(100svh - var(--header-height));
  overflow-y: auto;
}

@media (min-width: 960px) {
  .header-inner {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: var(--space-lg);
  }

  .nav-toggle,
  .nav-ready .nav-toggle {
    display: none;
  }

  .header-panel,
  .nav-ready .header-panel,
  .nav-ready .header-panel.is-open {
    display: contents;
    max-height: none;
    overflow: visible;
  }

  .site-nav {
    grid-column: 2;
    justify-self: center;
  }

  .site-nav__list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs) var(--space-md);
  }

  .site-nav__list a {
    border-block-end: 0;
    white-space: nowrap;
  }

  .header-cta {
    grid-column: 3;
    width: auto;
    white-space: nowrap;
  }
}

/* Page-spanning nest field */
.page-main {
  position: relative;
  isolation: isolate;
  overflow: clip;
}

.page-network {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  color: var(--color-ink-2);
  pointer-events: none;
}

.network-line,
.network-node,
.network-vein,
.network-red-nodes {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.network-base {
  opacity: var(--motif-field-opacity);
}

.network-line {
  stroke: var(--color-ink-2);
  stroke-width: var(--line-width);
}

.network-node {
  stroke: var(--color-ink-2);
  stroke-width: var(--node-width-small);
}

.network-vein {
  stroke-width: var(--line-width);
}

.vein-stop {
  stop-color: var(--color-brand-red);
}

.vein-stop--start {
  stop-opacity: var(--motif-red-opacity);
}

.vein-stop--end {
  stop-opacity: var(--opacity-none);
}

.network-red-nodes {
  stroke: var(--color-brand-red);
  stroke-width: var(--node-width);
  opacity: var(--motif-red-opacity);
}

.hero,
.content-section {
  position: relative;
  scroll-margin-top: calc(var(--header-height) + var(--space-md));
}

.hero__content,
.section__content {
  position: relative;
  z-index: 2;
}

.section--white {
  background-color: var(--color-paper);
}

.section--tinted {
  background-color: var(--color-paper-2);
}

/* Hero */
.hero {
  padding-block: var(--space-2xl);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-block: var(--rule-hairline);
  background-color: var(--color-paper);
}

.hero__mark-wrap,
.hero__copy {
  min-width: 0;
  padding-block: var(--space-xl);
}

.hero__mark-wrap {
  display: grid;
  place-items: center;
  border-block-end: var(--rule-hairline);
}

.hero__mark {
  width: min(100%, var(--hero-mark-max));
  height: auto;
}

.hero__copy {
  display: grid;
  align-content: center;
  gap: var(--space-lg);
}

.hero__copy h1 {
  max-width: var(--measure-hero);
}

.hero__copy p {
  color: var(--color-ink-2);
  font-size: var(--text-base);
  font-weight: var(--font-weight-bold);
}

.hero__punctuation {
  color: var(--color-brand-red);
}

@media (min-width: 768px) {
  .shell,
  .header-inner {
    padding-inline: var(--space-xl);
  }

  .hero {
    padding-block: var(--space-3xl);
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .hero__mark-wrap,
  .hero__copy {
    padding-block: var(--space-2xl);
  }

  .hero__mark-wrap {
    padding-inline-end: var(--space-2xl);
    border-block-end: 0;
    border-inline-end: var(--rule-hairline);
  }

  .hero__copy {
    padding-inline-start: var(--space-2xl);
  }
}

/* Shared section structure */
.content-section {
  padding-block: var(--space-2xl);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-md);
  margin-block-end: var(--space-xl);
}

.section-heading__line {
  align-self: center;
  width: var(--space-2xl);
  height: var(--line-width);
  background-color: var(--color-rule);
}

.section-label {
  display: inline-flex;
  align-items: center;
  align-self: center;
  justify-self: start;
  gap: var(--space-xs);
  color: var(--color-ink-2);
  font-family: var(--font-display-en);
  font-size: var(--text-label-en);
  font-weight: var(--font-weight-medium);
  line-height: var(--leading-label-en);
  letter-spacing: var(--tracking-label-en);
  text-transform: uppercase;
}

.section-label__node {
  flex: none;
  width: var(--space-xs);
  height: var(--space-xs);
  border-radius: var(--radius-pill);
  background-color: var(--color-brand-red);
}

@media (min-width: 768px) {
  .content-section {
    padding-block: var(--space-3xl);
  }

  .section-heading {
    grid-template-columns: minmax(0, calc(var(--space-3xl) + var(--space-3xl) + var(--space-xl))) minmax(0, 1fr);
    align-items: center;
    gap: var(--space-xl);
    margin-block-end: var(--space-2xl);
  }

  .section-heading__line {
    justify-self: stretch;
    width: auto;
  }

  .section-heading h2 {
    grid-column: 2;
  }
}

/* Concept matrix */
.concept-matrix {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  overflow: hidden;
  border: var(--rule-hairline);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

.concept-item {
  min-width: 0;
  padding: var(--space-lg);
  border-block-end: var(--rule-hairline);
}

.concept-item:last-child {
  border-block-end: 0;
}

.concept-item p {
  margin-block-start: var(--space-sm);
  color: var(--color-ink-2);
}

@media (min-width: 700px) {
  .concept-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .concept-item {
    padding: var(--space-xl);
    border-block-end: 0;
  }

  .concept-item:nth-child(odd) {
    border-inline-end: var(--rule-hairline);
  }

  .concept-item:nth-child(-n + 2) {
    border-block-end: var(--rule-hairline);
  }
}

/* Overview editorial split */
.overview-editorial {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg);
  padding-block-start: var(--space-xl);
  border-block-start: var(--rule-hairline);
}

.overview-editorial h3 {
  font-size: var(--text-3xl);
}

.overview-editorial p {
  color: var(--color-ink-2);
}

@media (min-width: 768px) {
  .overview-editorial {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-2xl);
  }
}

/* Benefits ledger */
.benefit-ledger {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  overflow: hidden;
  border: var(--rule-hairline);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

.benefit-item {
  display: grid;
  min-width: 0;
  align-content: start;
  gap: var(--space-sm);
  padding: var(--space-lg);
  border-block-end: var(--rule-hairline);
}

.benefit-item:last-child {
  border-block-end: 0;
}

.benefit-item__number {
  color: var(--color-accent);
  font-family: var(--font-display-en);
  font-size: var(--text-label-en);
  font-weight: var(--font-weight-medium);
  line-height: var(--leading-label-en);
  letter-spacing: var(--tracking-label-en);
  font-variant-numeric: tabular-nums;
}

.benefit-item p {
  color: var(--color-ink-2);
}

@media (min-width: 620px) {
  .benefit-ledger {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .benefit-item {
    border-block-end: 0;
  }

  .benefit-item:nth-child(odd) {
    border-inline-end: var(--rule-hairline);
  }

  .benefit-item:nth-child(-n + 2) {
    border-block-end: var(--rule-hairline);
  }
}

@media (min-width: 960px) {
  .benefit-ledger {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .benefit-item,
  .benefit-item:nth-child(-n + 2) {
    border-block-end: 0;
  }

  .benefit-item:not(:last-child) {
    border-inline-end: var(--rule-hairline);
  }
}

/* Pricing: wide fee ledger with two stacked side panels */
.pricing-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-md);
}

.price-panel {
  min-width: 0;
  padding: var(--space-lg);
  border: var(--rule-hairline);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

.price-panel p {
  margin-block-start: var(--space-md);
  color: var(--color-ink-2);
}

.price-panel__note {
  display: block;
  margin-block-start: var(--space-sm);
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-label);
}

.fee-list {
  margin-block-start: var(--space-lg);
}

.fee-list__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-xs) var(--space-md);
  padding-block: var(--space-sm);
  border-block-end: var(--rule-hairline);
}

.fee-list__row:first-child {
  border-block-start: var(--rule-hairline);
}

.fee-list dt {
  color: var(--color-ink-2);
}

.fee-list dd {
  color: var(--color-ink);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-heading);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

@media (min-width: 820px) {
  .pricing-layout {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-lg);
  }

  .price-panel {
    padding: var(--space-xl);
  }

  .price-panel--fees {
    grid-row: 1 / 3;
  }
}

/* Joining: alternating vertical route */
.join-route {
  position: relative;
  max-width: calc(
    var(--space-3xl) + var(--space-3xl) + var(--space-3xl) +
    var(--space-3xl) + var(--space-3xl) + var(--space-3xl) +
    var(--space-3xl) + var(--space-3xl) + var(--space-3xl)
  );
  margin-inline: auto;
}

.join-route__svg {
  position: absolute;
  z-index: 1;
  inset-block: 0;
  inset-inline-start: 0;
  width: calc(var(--space-xl) + var(--space-xs));
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.join-route__line {
  fill: none;
  stroke: var(--color-ink-2);
  stroke-width: var(--line-width);
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: var(--motif-step-opacity);
}

.join-route__nodes {
  fill: none;
  stroke: var(--color-brand-red);
  stroke-width: var(--node-width);
  stroke-linecap: round;
  opacity: var(--motif-red-opacity);
}

.join-steps {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg);
  list-style: none;
}

.join-step {
  display: grid;
  min-width: 0;
  min-height: calc(var(--space-3xl) + var(--space-xl));
  align-content: center;
  gap: var(--space-xs);
  margin-inline-start: calc(var(--space-xl) + var(--space-lg));
  padding: var(--space-lg);
  border: var(--rule-hairline);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

.join-step__number {
  color: var(--color-brand-red);
  font-family: var(--font-display-en);
  font-size: var(--text-label-en);
  font-weight: var(--font-weight-medium);
  line-height: var(--leading-label-en);
  letter-spacing: var(--tracking-label-en);
  font-variant-numeric: tabular-nums;
}

.join-step h3 {
  font-size: var(--text-base);
}

.final-cta {
  display: flex;
  justify-content: center;
  margin-block-start: var(--space-2xl);
}

@media (min-width: 700px) {
  .join-route__svg {
    inset-inline-start: calc(50% - var(--space-xl));
    width: calc(var(--space-xl) + var(--space-xl));
  }

  .join-step {
    width: calc(50% - var(--space-xl));
    min-height: calc(var(--space-3xl) + var(--space-2xl));
    margin-inline-start: 0;
  }

  .join-step:nth-child(odd) {
    justify-self: start;
  }

  .join-step:nth-child(even) {
    justify-self: end;
  }
}

/* Footer */
.site-footer {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: var(--space-2xl);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.site-footer :focus-visible {
  outline-color: var(--color-accent-ink);
}

.footer-network {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  color: var(--color-accent-ink);
  pointer-events: none;
}

.footer-network__line,
.footer-network__nodes {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: var(--motif-footer-opacity);
}

.footer-network__line {
  stroke-width: var(--line-width);
}

.footer-network__nodes {
  stroke-width: var(--node-width-small);
}

.footer-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  justify-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  color: var(--color-accent-ink);
  font-size: var(--text-sm);
  line-height: var(--leading-label);
  letter-spacing: var(--tracking-ui);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: var(--control-min);
  color: var(--color-accent-ink);
  text-underline-offset: var(--space-2xs);
}

.footer-copy {
  color: var(--color-accent-ink);
  opacity: var(--footer-copy-opacity);
}

.footer-copy small {
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-ui);
}

@media (min-width: 820px) {
  .site-footer {
    padding-block: var(--space-3xl);
  }

  .footer-inner {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    justify-items: stretch;
    text-align: start;
  }

  .footer-cta {
    justify-self: start;
  }

  .footer-links {
    justify-self: center;
  }

  .footer-copy {
    justify-self: end;
  }
}

/* Progressive reveal: the unenhanced page remains fully visible. */
.reveal-ready .reveal {
  opacity: var(--opacity-none);
  transition: opacity var(--dur-base) var(--ease-out);
}

.reveal-ready .reveal.is-visible,
.reveal-ready .reveal:focus-within {
  opacity: var(--opacity-full);
}

.reveal-ready .reveal:focus-within {
  transition: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal-ready .reveal {
    transition: none;
  }
}

@media print {
  .page-network,
  .footer-network,
  .join-route__svg,
  .nav-toggle {
    display: none;
  }

  .reveal,
  .reveal-ready .reveal {
    opacity: var(--opacity-full);
    transition: none;
  }

  .site-header,
  .nav-ready .site-header {
    position: static;
    inset-block-start: auto;
  }

  .header-panel,
  .nav-ready .header-panel,
  .nav-ready .header-panel.is-open {
    display: flex;
    max-height: none;
    overflow: visible;
  }

  .section--tinted,
  .site-footer {
    background-color: var(--color-paper);
  }

  .site-footer {
    border-block-start: var(--rule-hairline);
    color: var(--color-ink);
  }

  .site-footer :focus-visible {
    outline-color: var(--color-focus);
  }

  .footer-links,
  .footer-links a,
  .footer-copy {
    color: var(--color-ink);
    opacity: var(--opacity-full);
  }

  .button--primary,
  .button--inverse {
    border-color: var(--color-rule);
    background-color: var(--color-paper);
    color: var(--color-ink);
  }

  .concept-item,
  .benefit-item,
  .price-panel,
  .join-step {
    break-inside: avoid;
  }
}