:root {
  --color-primary: #10263f;
  --color-primary-soft: #1c3a5c;
  --color-bg: #fbfaf7;
  --color-surface: #ffffff;
  --color-accent: #b45309;
  --color-accent-soft: #fdf1e3;
  --color-neutral: #5b6472;
  --color-border: #dfdcd4;
  --color-border-strong: #c6c2b8;
  --color-text: #1d2733;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --container: 1120px;
  --reading: 760px;
  --radius: 6px;
  --focus-outline: 2px solid var(--color-accent);
  --focus-offset: 2px;
}

/* ============================================================
   base
   ============================================================ */

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-primary);
}

p {
  margin: 0 0 0.9em;
}

p:last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--color-primary);
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
  border-radius: 2px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

figure {
  margin: 0;
}

figcaption {
  margin-top: 0.5em;
  font-size: 0.875rem;
  color: var(--color-neutral);
  line-height: 1.6;
}

strong {
  font-weight: 600;
  color: var(--color-primary);
}

/* ============================================================
   layout — shell
   ============================================================ */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1 1 auto;
}

.site-notice {
  margin: 0;
  padding: 0.55em 1.25em;
  background-color: var(--color-primary);
  color: #eef2f7;
  font-size: 0.875rem;
  text-align: center;
  line-height: 1.55;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25em;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1em;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.35em;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.7em;
  font-size: 0.9375rem;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius);
}

.nav-link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.nav-link.is-current {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-primary);
}

/* ============================================================
   layout — inner pages
   ============================================================ */

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.5em 1.25em 3em;
  width: 100%;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4em;
  font-size: 0.875rem;
  color: var(--color-neutral);
  margin-bottom: 1em;
}

.breadcrumb a {
  color: var(--color-neutral);
  text-decoration: underline;
}

.breadcrumb a:hover {
  color: var(--color-accent);
}

.breadcrumb-sep {
  color: var(--color-border-strong);
}

.breadcrumb-current {
  color: var(--color-primary);
  font-weight: 600;
}

.page-header {
  max-width: var(--reading);
  margin-bottom: 2em;
}

.page-title {
  font-size: 30px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5em;
}

.page-description {
  font-size: 1rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0;
}

.section {
  margin-bottom: 2.75em;
}

.section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5em;
}

.section-intro,
.section-lead {
  max-width: var(--reading);
  font-size: 1rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 1.25em;
}

.section-more {
  margin-top: 1.25em;
  font-size: 0.9375rem;
}

.text-link {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: underline;
}

.text-link:hover {
  color: var(--color-primary);
}

/* ============================================================
   components — buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.6em 1.4em;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-soft);
  color: #ffffff;
  text-decoration: underline;
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-border-strong);
}

.btn-ghost:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  text-decoration: underline;
}

/* ============================================================
   components — faq
   ============================================================ */

.faq-group {
  margin-bottom: 1.5em;
}

.faq-group:last-child {
  margin-bottom: 0;
}

.faq-group-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.6em;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  margin-bottom: 0.5em;
}

.faq-item:last-child {
  margin-bottom: 0;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75em;
  min-height: 44px;
  padding: 0.7em 1em;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  flex: 0 0 auto;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-accent);
  line-height: 1;
}

.faq-item[open] .faq-question::after {
  content: "−";
}

.faq-answer {
  padding: 0 1em 0.9em;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.75;
}

.faq-answer a {
  color: var(--color-accent);
}

/* ============================================================
   components — footer
   ============================================================ */

.site-footer {
  background-color: var(--color-primary);
  color: #d8dee7;
  margin-top: 2em;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2.5em 1.25em 2em;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2em;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 0.75em;
}

.footer-text {
  font-size: 0.875rem;
  line-height: 1.75;
  color: #c3ccd8;
  margin-bottom: 0.6em;
}

.footer-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25em 1em;
}

.footer-list li {
  min-height: 32px;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 0.875rem;
  color: #d8dee7;
  text-decoration: underline;
  text-decoration-color: rgba(216, 222, 231, 0.45);
}

.footer-list a:hover {
  color: #ffffff;
  text-decoration-color: #ffffff;
}

.footer-copy {
  font-size: 0.8125rem;
  color: #9aa6b5;
  margin-bottom: 0;
}

/* ============================================================
   pages — index
   ============================================================ */

.home-main {
  display: block;
}

.hero-section {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 3em 1.25em;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2.5em;
  align-items: center;
}

.hero-content {
  min-width: 0;
}

.hero-title {
  font-size: 34px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.6em;
}

.hero-lead {
  font-size: 1.0625rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 1em;
}

.hero-points {
  margin-bottom: 1.5em;
}

.hero-points li {
  position: relative;
  padding-left: 1.25em;
  margin-bottom: 0.5em;
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.7;
}

.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75em;
}

.hero-media {
  min-width: 0;
}

.hero-figure {
  margin: 0;
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.section-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25em;
}

.section-positioning,
.section-matrix,
.section-scenarios,
.section-process,
.section-standards,
.section-faq,
.section-index {
  padding-top: 2.75em;
}

.positioning-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25em;
}

.positioning-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.35em 1.25em;
}

.positioning-card .card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5em;
}

.positioning-card p {
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0;
}

.matrix-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  min-width: 640px;
}

.matrix-caption {
  caption-side: top;
  text-align: left;
  padding: 0.9em 1em 0.4em;
  font-size: 0.875rem;
  color: var(--color-neutral);
}

.matrix-table th,
.matrix-table td {
  padding: 0.85em 1em;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.7;
}

.matrix-table thead th {
  background-color: #f4f2ec;
  color: var(--color-primary);
  font-weight: 600;
  white-space: nowrap;
}

.matrix-table tbody tr:last-child td {
  border-bottom: none;
}

.matrix-no {
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
  font-weight: 600;
  white-space: nowrap;
}

.matrix-name {
  font-weight: 600;
  color: var(--color-primary);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.scenario-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25em;
}

.section-scenarios .scenario-featured {
  grid-column: span 1;
}

.section-scenarios .scenario-featured .scenario-figure {
  margin: 0 0 0.9em;
}

.section-scenarios .scenario-featured .scenario-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.scenario-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5em;
}

.scenario-item p {
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0.6em;
}

.section-scenarios .scenario-link {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

.process-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25em;
  counter-reset: process;
}

.process-step {
  position: relative;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25em 1.15em;
  counter-increment: process;
}

.process-step::before {
  content: counter(process, decimal-leading-zero);
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.35em;
}

.process-step .step-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5em;
}

.process-step .step-owner {
  font-size: 0.875rem;
  color: var(--color-neutral);
  line-height: 1.7;
  margin-bottom: 0.5em;
}

.process-step .step-output {
  font-size: 0.875rem;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 0;
}

.standards-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.standards-col {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.35em 1.25em;
}

.standards-col .col-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75em;
}

.standards-list li {
  position: relative;
  padding-left: 1.1em;
  margin-bottom: 0.55em;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.75;
}

.standards-list li:last-child {
  margin-bottom: 0;
}

.standards-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.section-faq .faq-item {
  background-color: var(--color-surface);
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1em;
}

.index-item {
  display: flex;
  flex-direction: column;
  gap: 0.35em;
  padding: 1.1em 1em;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  min-height: 44px;
}

.index-item:hover {
  border-color: var(--color-accent);
  text-decoration: none;
}

.index-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}

.index-item:hover .index-name {
  color: var(--color-accent);
}

.index-desc {
  font-size: 0.8125rem;
  color: var(--color-neutral);
  line-height: 1.65;
}

/* ============================================================
   pages — services
   ============================================================ */

.section-services-list .service-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5em 1.4em;
  margin-bottom: 1.25em;
}

.section-services-list .service-item:last-child {
  margin-bottom: 0;
}

.service-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.6em;
}

.service-media {
  margin: 0 0 1em;
}

.service-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.service-desc {
  max-width: var(--reading);
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 1em;
}

.service-meta {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(120px, 180px) minmax(0, 1fr);
  gap: 0.4em 1em;
  font-size: 0.9375rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1em;
}

.service-meta-key {
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.7;
}

.service-meta-value {
  margin: 0;
  color: var(--color-neutral);
  line-height: 1.75;
}

.service-deliverables {
  margin: 0;
}

.service-deliverables li {
  position: relative;
  padding-left: 1.1em;
  margin-bottom: 0.35em;
  line-height: 1.7;
}

.service-deliverables li:last-child {
  margin-bottom: 0;
}

.service-deliverables li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.selection-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25em;
}

.selection-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 1.15em 1.1em;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.75;
}

.selection-note {
  margin-top: 1.25em;
  font-size: 0.9375rem;
  color: var(--color-neutral);
}

.selection-note a {
  margin-right: 1em;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25em;
}

.related-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.15em 1.1em;
}

.related-card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.45em;
}

.related-card-title a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}

.related-card-title a:hover {
  color: var(--color-accent);
}

.related-card-text {
  font-size: 0.875rem;
  color: var(--color-neutral);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ============================================================
   pages — scenarios
   ============================================================ */

.scenarios-section {
  margin-bottom: 2.75em;
}

.scenario-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.scenarios-section .scenario-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.35em 1.25em;
}

.scenarios-section .scenario-item-featured {
  grid-column: span 2;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 1.5em;
  align-items: start;
}

.scenarios-section .scenario-item-featured .scenario-media {
  margin: 0;
}

.scenarios-section .scenario-item-featured .scenario-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.scenarios-section .scenario-body {
  min-width: 0;
}

.scenarios-section .scenario-problem {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.75;
  margin-bottom: 0.7em;
}

.scenario-checks {
  margin-bottom: 0.7em;
}

.scenario-checks li {
  position: relative;
  padding-left: 1.1em;
  margin-bottom: 0.4em;
  font-size: 0.875rem;
  color: var(--color-neutral);
  line-height: 1.7;
}

.scenario-checks li:last-child {
  margin-bottom: 0;
}

.scenario-checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.scenarios-section .scenario-link {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

.checkpoints-section {
  margin-bottom: 2.75em;
}

.checkpoints-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.checkpoint-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.2em 1.15em;
}

.checkpoint-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.45em;
}

.checkpoint-text {
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0;
}

/* ============================================================
   pages — process
   ============================================================ */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 2em;
  align-items: start;
}

.layout-main {
  min-width: 0;
}

.layout-aside {
  min-width: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25em 1.15em;
}

.aside-media {
  margin: 0 0 1.25em;
}

.aside-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.aside-media-caption {
  margin-top: 0.5em;
  font-size: 0.8125rem;
  color: var(--color-neutral);
  line-height: 1.6;
}

.aside-block {
  margin-bottom: 1.25em;
}

.aside-block:last-child {
  margin-bottom: 0;
}

.aside-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.6em;
}

.aside-stage-list {
  counter-reset: aside-stage;
}

.aside-stage-item {
  counter-increment: aside-stage;
  border-top: 1px solid var(--color-border);
}

.aside-stage-item:first-child {
  border-top: none;
}

.aside-stage-item a {
  display: flex;
  align-items: baseline;
  gap: 0.6em;
  min-height: 44px;
  padding: 0.5em 0;
  font-size: 0.9375rem;
  color: var(--color-text);
  text-decoration: none;
  line-height: 1.6;
}

.aside-stage-item a::before {
  content: counter(aside-stage, decimal-leading-zero);
  flex: 0 0 auto;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.aside-stage-item a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.aside-terms {
  font-size: 0.875rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0;
}

.stage-block {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.35em 1.25em;
  margin-bottom: 1.25em;
}

.stage-block:last-child {
  margin-bottom: 0;
}

.stage-head {
  display: flex;
  align-items: baseline;
  gap: 0.7em;
  margin-bottom: 0.9em;
  padding-bottom: 0.7em;
  border-bottom: 1px solid var(--color-border);
}

.stage-index {
  flex: 0 0 auto;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.stage-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.stage-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.stage-col {
  min-width: 0;
}

.stage-col-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.45em;
}

.stage-owner,
.stage-output,
.stage-confirm {
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0.5em;
}

.stage-list {
  margin-bottom: 0.5em;
}

.stage-list li {
  position: relative;
  padding-left: 1.1em;
  margin-bottom: 0.35em;
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.7;
}

.stage-list li:last-child {
  margin-bottom: 0;
}

.stage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.stuck-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.stuck-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 1.15em 1.1em;
}

.stuck-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.4em;
}

.stuck-desc {
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0;
}

/* ============================================================
   pages — standards
   ============================================================ */

.standards-section,
.verify-section,
.boundary-section,
.premise-section,
.related-section {
  margin-bottom: 2.75em;
}

.requirement-list {
  counter-reset: requirement;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.requirement-item {
  counter-increment: requirement;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25em 1.2em;
}

.requirement-item::before {
  content: counter(requirement, decimal-leading-zero);
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.3em;
}

.requirement-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.45em;
}

.requirement-desc {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.75;
  margin-bottom: 0.6em;
}

.requirement-check {
  font-size: 0.875rem;
  color: var(--color-neutral);
  line-height: 1.7;
  margin-bottom: 0;
  padding-top: 0.6em;
  border-top: 1px dashed var(--color-border-strong);
}

.check-label {
  font-weight: 600;
  color: var(--color-primary);
}

.verify-figure {
  margin: 0 0 1.25em;
}

.verify-figure img {
  width: 100%;
  max-height: 360px;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.figure-caption {
  margin-top: 0.5em;
  font-size: 0.875rem;
  color: var(--color-neutral);
  line-height: 1.65;
}

.verify-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25em;
}

.verify-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.1em 1.05em;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.75;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.boundary-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-neutral);
  border-radius: var(--radius);
  padding: 1.15em 1.1em;
}

.boundary-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.4em;
}

.boundary-desc {
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0;
}

.premise-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.premise-item {
  position: relative;
  padding-left: 1.35em;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.75;
}

.premise-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75em 1.5em;
}

.related-item a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.9375rem;
  color: var(--color-accent);
  text-decoration: underline;
}

.related-item a:hover {
  color: var(--color-primary);
}

/* ============================================================
   pages — contact
   ============================================================ */

.media-figure {
  margin: 0 0 1.25em;
}

.media-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.prepare-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.prepare-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.15em 1.1em;
}

.prepare-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.4em;
}

.prepare-desc {
  font-size: 0.9375rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 0;
}

.scope-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25em;
}

.scope-col {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25em 1.2em;
}

.scope-col-covered {
  border-top: 3px solid var(--color-accent);
}

.scope-col-excluded {
  border-top: 3px solid var(--color-neutral);
}

.scope-col-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.7em;
}

.scope-list li {
  position: relative;
  padding-left: 1.1em;
  margin-bottom: 0.5em;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.75;
}

.scope-list li:last-child {
  margin-bottom: 0;
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.scope-col-excluded .scope-list li::before {
  background-color: var(--color-neutral);
}

/* ============================================================
   pages — 404
   ============================================================ */

.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 3em 1.25em;
  width: 100%;
}

.error-block {
  max-width: var(--reading);
  margin-bottom: 2.5em;
}

.error-block h1 {
  font-size: 30px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5em;
}

.error-text {
  font-size: 1rem;
  color: var(--color-neutral);
  line-height: 1.75;
  margin-bottom: 1.25em;
}

.error-actions {
  margin-bottom: 0;
}

.error-links h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75em;
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75em 1.5em;
}

.error-link-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.9375rem;
  color: var(--color-accent);
  text-decoration: underline;
}

.error-link-list a:hover {
  color: var(--color-primary);
}

/* ============================================================
   responsive
   ============================================================ */

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: static;
  }

  .nav-list {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5em 1.25em 1em;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-link {
    justify-content: flex-start;
    width: 100%;
    padding: 0.6em 0;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }

  .nav-list li:last-child .nav-link {
    border-bottom: none;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    padding: 2.25em 1.25em;
    gap: 1.75em;
  }

  .hero-title {
    font-size: 28px;
  }

  .positioning-grid,
  .scenario-grid,
  .process-strip,
  .standards-columns,
  .selection-list,
  .related-grid,
  .checkpoints-list,
  .requirement-list,
  .boundary-list,
  .premise-list,
  .prepare-list,
  .scope-columns,
  .stuck-list,
  .verify-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .index-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .scenarios-section .scenario-item-featured {
    grid-column: span 1;
    grid-template-columns: minmax(0, 1fr);
    gap: 1em;
  }

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

  .layout-aside {
    order: 2;
  }

  .layout-main {
    order: 1;
  }

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

  .service-meta {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.15em 0;
  }

  .service-meta-key {
    margin-top: 0.4em;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5em;
  }

  .error-link-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  body {
    font-size: 16px;
  }

  .site-notice {
    font-size: 0.8125rem;
    text-align: left;
  }

  .header-inner {
    padding: 0 1em;
  }

  .inner-main,
  .error-main {
    padding: 1.25em 1em 2.5em;
  }

  .hero-inner,
  .section-inner {
    padding-left: 1em;
    padding-right: 1em;
  }

  .hero-title {
    font-size: 26px;
  }

  .page-title,
  .error-block h1 {
    font-size: 26px;
  }

  .section-title,
  .error-links h2 {
    font-size: 20px;
  }

  .section-positioning,
  .section-matrix,
  .section-scenarios,
  .section-process,
  .section-standards,
  .section-faq,
  .section-index {
    padding-top: 2em;
  }

  .section {
    margin-bottom: 2em;
  }

  .standards-section,
  .verify-section,
  .boundary-section,
  .premise-section,
  .related-section,
  .scenarios-section,
  .checkpoints-section {
    margin-bottom: 2em;
  }

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

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

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

  .matrix-table {
    min-width: 520px;
    font-size: 0.875rem;
  }

  .matrix-table th,
  .matrix-table td {
    padding: 0.7em 0.75em;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .faq-question {
    font-size: 0.9375rem;
  }

  .footer-inner {
    padding: 2em 1em 1.5em;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}