:root {
  --brief-primary: #0F2540;
  --brief-primary-soft: #1A3355;
  --brief-secondary: #3A4A63;
  --brief-accent: #C9A86A;
  --brief-accent-deep: #A88846;
  --brief-bg: #F5F2ED;
  --brief-bg-alt: #EEE8DD;
  --brief-surface: #FFFFFF;
  --brief-text: #1A1A1A;
  --brief-text-muted: #555762;
  --brief-border: #D7CFBF;
  --brief-border-strong: #BAB0A0;
  --brief-shadow: 0 4px 16px rgba(15, 37, 64, 0.08);
  --brief-shadow-card: 0 2px 10px rgba(15, 37, 64, 0.06);
  --brief-radius: 4px;
  --brief-radius-card: 6px;
  --brief-serif: 'Noto Serif JP', 'Yu Mincho', 'Hiragino Mincho ProN', serif;
  --brief-sans: 'Noto Sans JP', 'Yu Gothic', 'Hiragino Sans', system-ui, sans-serif;
  --brief-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --brief-container: 1180px;
  --brief-container-narrow: 920px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--brief-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--brief-text);
  background: var(--brief-bg);
  font-feature-settings: "palt";
}

h1, h2, h3, h4, h5 {
  font-family: var(--brief-serif);
  font-weight: 600;
  color: var(--brief-primary);
  letter-spacing: 0.02em;
  line-height: 1.45;
  margin: 0 0 0.8em;
}

h1 { font-size: 2.1rem; }
h2 { font-size: 1.55rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

p {
  margin: 0 0 1.1em;
}

a {
  color: var(--brief-primary);
  text-decoration: none;
  transition: color 0.18s ease;
}

a:hover {
  color: var(--brief-accent-deep);
}

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

.brief-container {
  max-width: var(--brief-container);
  margin: 0 auto;
  padding: 0 24px;
}

.brief-container-narrow {
  max-width: var(--brief-container-narrow);
  margin: 0 auto;
  padding: 0 24px;
}

.brief-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--brief-bg);
  border-bottom: 1px solid var(--brief-border);
}

.brief-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 24px;
}

.brief-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brief-logo-name {
  font-family: var(--brief-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--brief-primary);
}

.brief-logo-sub {
  font-size: 0.72rem;
  color: var(--brief-text-muted);
  letter-spacing: 0.04em;
}

.brief-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.brief-nav > li {
  position: relative;
}

.brief-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.92rem;
  color: var(--brief-text);
  border-radius: var(--brief-radius);
}

.brief-nav a:hover,
.brief-nav a.is-current {
  color: var(--brief-primary);
  background: rgba(15, 37, 64, 0.06);
}

.brief-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 320px;
  background: var(--brief-surface);
  border: 1px solid var(--brief-border);
  box-shadow: var(--brief-shadow);
  border-radius: var(--brief-radius);
  padding: 10px;
  list-style: none;
  margin: 6px 0 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s;
}

.brief-nav > li:hover .brief-dropdown,
.brief-nav > li:focus-within .brief-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.brief-dropdown a {
  display: block;
  padding: 10px 12px;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--brief-border);
}

.brief-dropdown li:last-child a {
  border-bottom: none;
}

.brief-cta-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  background: var(--brief-primary);
  color: #F5F2ED;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--brief-radius);
  border: 1px solid var(--brief-primary);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

.brief-cta-button:hover {
  background: var(--brief-accent-deep);
  color: #F5F2ED;
  border-color: var(--brief-accent-deep);
}

.brief-cta-button--ghost {
  background: transparent;
  color: var(--brief-primary);
}

.brief-cta-button--ghost:hover {
  background: var(--brief-primary);
  color: #F5F2ED;
}

.brief-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--brief-border-strong);
  border-radius: var(--brief-radius);
  padding: 8px 10px;
  cursor: pointer;
}

.brief-menu-toggle i {
  font-size: 1.2rem;
  color: var(--brief-primary);
}

.brief-hero {
  position: relative;
  background-color: var(--brief-primary);
  background-image: linear-gradient(135deg, rgba(15, 37, 64, 0.78), rgba(15, 37, 64, 0.58)), url('../media/tsushin-hero-tokyo-dawn.jpg');
  background-size: cover;
  background-position: center;
  color: #F5F2ED;
  min-height: 560px;
  display: flex;
  align-items: center;
  padding: 80px 0;
}

.brief-hero-inner {
  max-width: 760px;
}

.brief-hero-eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brief-accent);
  margin-bottom: 14px;
  border-left: 3px solid var(--brief-accent);
  padding-left: 10px;
}

.brief-hero h1 {
  color: #F5F2ED;
  font-size: 2.55rem;
  line-height: 1.35;
  margin-bottom: 18px;
}

.brief-hero-sub {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 620px;
  color: rgba(245, 242, 237, 0.92);
}

.brief-hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.brief-hero .brief-cta-button {
  background: var(--brief-accent);
  color: var(--brief-primary);
  border-color: var(--brief-accent);
}

.brief-hero .brief-cta-button:hover {
  background: #E6C58E;
  color: var(--brief-primary);
  border-color: #E6C58E;
}

.brief-hero .brief-cta-button--ghost {
  background: transparent;
  color: #F5F2ED;
  border-color: rgba(245, 242, 237, 0.6);
}

.brief-hero .brief-cta-button--ghost:hover {
  background: rgba(245, 242, 237, 0.1);
  color: #F5F2ED;
  border-color: #F5F2ED;
}

.brief-section {
  padding: 72px 0;
}

.brief-section--alt {
  background: var(--brief-bg-alt);
}

.brief-section-head {
  max-width: 720px;
  margin-bottom: 40px;
}

.brief-section-number {
  display: block;
  font-family: var(--brief-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--brief-accent-deep);
  margin-bottom: 10px;
}

.brief-section-head h2 {
  margin-bottom: 14px;
}

.brief-section-head p {
  color: var(--brief-text-muted);
  font-size: 1rem;
}

.brief-about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: start;
}

.brief-about-text h3 {
  font-size: 1.4rem;
}

.brief-about-image img {
  border-radius: var(--brief-radius-card);
  box-shadow: var(--brief-shadow-card);
}

.brief-mission {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: center;
}

.brief-mission-image img {
  border-radius: var(--brief-radius-card);
  box-shadow: var(--brief-shadow-card);
}

.brief-advantages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.brief-advantage-card {
  background: var(--brief-surface);
  border: 1px solid var(--brief-border);
  padding: 24px;
  border-radius: var(--brief-radius-card);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.brief-advantage-card i {
  font-size: 1.8rem;
  color: var(--brief-accent-deep);
}

.brief-advantage-card h4 {
  margin: 0;
  font-size: 1rem;
  color: var(--brief-primary);
}

.brief-advantage-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--brief-text-muted);
  line-height: 1.7;
}

.brief-article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.brief-article-card {
  background: var(--brief-surface);
  border: 1px solid var(--brief-border);
  border-radius: var(--brief-radius-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.brief-article-card:hover {
  border-color: var(--brief-accent-deep);
  transform: translateY(-2px);
}

.brief-article-card-figure {
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

.brief-article-card-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brief-article-card-body {
  padding: 20px 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.brief-article-card-meta {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--brief-accent-deep);
  text-transform: uppercase;
  font-family: var(--brief-mono);
}

.brief-article-card h3 {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.5;
}

.brief-article-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--brief-text-muted);
  line-height: 1.75;
}

.brief-article-card-cta {
  margin-top: auto;
  padding-top: 10px;
  font-size: 0.88rem;
  color: var(--brief-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  border-top: 1px solid var(--brief-border);
}

.brief-faq {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 820px;
}

.brief-faq-item {
  background: var(--brief-surface);
  border: 1px solid var(--brief-border);
  border-radius: var(--brief-radius);
}

.brief-faq-item summary {
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 500;
  color: var(--brief-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
}

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

.brief-faq-item summary::after {
  content: "+";
  font-size: 1.2rem;
  color: var(--brief-accent-deep);
  margin-left: 12px;
}

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

.brief-faq-item[open] summary {
  border-bottom: 1px solid var(--brief-border);
}

.brief-faq-item .brief-faq-body {
  padding: 14px 22px 20px;
  color: var(--brief-text-muted);
  font-size: 0.96rem;
  line-height: 1.8;
}

.brief-methodology {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  counter-reset: method;
}

.brief-methodology-item {
  padding: 24px 22px;
  border-left: 2px solid var(--brief-accent);
  background: var(--brief-surface);
  counter-increment: method;
}

.brief-methodology-item::before {
  content: counter(method, decimal-leading-zero);
  display: block;
  font-family: var(--brief-mono);
  font-size: 0.82rem;
  color: var(--brief-accent-deep);
  letter-spacing: 0.18em;
  margin-bottom: 8px;
}

.brief-methodology-item h4 {
  margin-bottom: 6px;
}

.brief-methodology-item p {
  font-size: 0.92rem;
  color: var(--brief-text-muted);
  margin: 0;
}

.brief-closing {
  background: var(--brief-primary);
  color: #F5F2ED;
  padding: 80px 0;
  text-align: left;
}

.brief-closing h2 {
  color: #F5F2ED;
  max-width: 720px;
}

.brief-closing p {
  color: rgba(245, 242, 237, 0.88);
  max-width: 700px;
  font-size: 1rem;
}

.brief-closing .brief-cta-button {
  background: var(--brief-accent);
  color: var(--brief-primary);
  border-color: var(--brief-accent);
  margin-top: 20px;
}

.brief-closing .brief-cta-button:hover {
  background: #E6C58E;
}

.brief-footer {
  background: var(--brief-primary);
  color: rgba(245, 242, 237, 0.85);
  padding: 64px 0 0;
  font-size: 0.92rem;
}

.brief-footer-columns {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(245, 242, 237, 0.14);
}

.brief-footer h5 {
  color: #F5F2ED;
  font-family: var(--brief-sans);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.brief-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.brief-footer a {
  color: rgba(245, 242, 237, 0.82);
}

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

.brief-contact-info-line {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.brief-contact-info-line i {
  color: var(--brief-accent);
  font-size: 1rem;
  margin-top: 4px;
  flex-shrink: 0;
}

.brief-footer-copy {
  padding: 22px 0;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: rgba(245, 242, 237, 0.6);
}

.brief-article-hero {
  padding: 60px 0 40px;
  background: var(--brief-bg-alt);
  border-bottom: 1px solid var(--brief-border);
}

.brief-article-hero .brief-breadcrumb {
  font-size: 0.82rem;
  color: var(--brief-text-muted);
  margin-bottom: 14px;
}

.brief-article-hero h1 {
  max-width: 820px;
  font-size: 2rem;
  margin-bottom: 14px;
}

.brief-article-byline {
  font-family: var(--brief-mono);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--brief-accent-deep);
  text-transform: uppercase;
}

.brief-article-body {
  padding: 52px 0 40px;
  max-width: var(--brief-container-narrow);
  margin: 0 auto;
}

.brief-article-body img {
  border-radius: var(--brief-radius-card);
  margin: 20px 0;
  box-shadow: var(--brief-shadow-card);
}

.brief-article-body h2 {
  margin-top: 2em;
  padding-top: 0.4em;
  border-top: 1px solid var(--brief-border);
  font-size: 1.45rem;
}

.brief-article-body h3 {
  margin-top: 1.6em;
  font-size: 1.18rem;
}

.brief-article-body ul,
.brief-article-body ol {
  padding-left: 1.4em;
  margin-bottom: 1.2em;
}

.brief-article-body li {
  margin-bottom: 0.4em;
  line-height: 1.8;
}

.brief-article-body blockquote {
  border-left: 3px solid var(--brief-accent);
  padding: 4px 20px;
  margin: 20px 0;
  color: var(--brief-text-muted);
  font-style: normal;
}

.brief-prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  padding: 40px 0 20px;
  border-top: 1px solid var(--brief-border);
  margin-top: 48px;
}

.brief-prev-next a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  border: 1px solid var(--brief-border);
  border-radius: var(--brief-radius-card);
  background: var(--brief-surface);
  transition: border-color 0.18s ease;
}

.brief-prev-next a:hover {
  border-color: var(--brief-accent-deep);
}

.brief-prev-next span.label {
  font-family: var(--brief-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--brief-accent-deep);
  text-transform: uppercase;
}

.brief-prev-next a.align-right {
  text-align: right;
}

.brief-backlist {
  text-align: center;
  padding: 20px 0 40px;
}

.brief-list-layout {
  padding: 64px 0;
}

.brief-list-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.brief-about-hero {
  padding: 80px 0 40px;
  background: var(--brief-bg-alt);
}

.brief-about-hero-image {
  margin-top: 36px;
  border-radius: var(--brief-radius-card);
  overflow: hidden;
  box-shadow: var(--brief-shadow-card);
}

.brief-about-principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  padding: 40px 0;
}

.brief-about-principles article {
  padding: 24px;
  border: 1px solid var(--brief-border);
  border-radius: var(--brief-radius-card);
  background: var(--brief-surface);
}

.brief-contact-layout {
  padding: 0 0 72px;
}

.brief-contact-intro {
  background: var(--brief-bg-alt);
  padding: 64px 0 40px;
}

.brief-contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
  padding: 48px 0;
}

.brief-contact-info {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.brief-contact-info-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  align-items: start;
}

.brief-contact-info-item .icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(15, 37, 64, 0.08);
  color: var(--brief-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.brief-contact-info-item h4 {
  margin: 0 0 4px;
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: var(--brief-text-muted);
  text-transform: uppercase;
  font-family: var(--brief-sans);
  font-weight: 500;
}

.brief-contact-info-item p {
  margin: 0;
  color: var(--brief-text);
  font-size: 1rem;
  line-height: 1.65;
}

.brief-form-card {
  background: var(--brief-surface);
  padding: 36px;
  border: 1px solid var(--brief-border);
  border-radius: var(--brief-radius-card);
  box-shadow: var(--brief-shadow);
}

.brief-form-card h2 {
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.brief-form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.brief-form-row label {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--brief-text-muted);
}

.brief-form-row input,
.brief-form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--brief-border-strong);
  border-radius: var(--brief-radius);
  font-family: var(--brief-sans);
  font-size: 0.96rem;
  color: var(--brief-text);
  background: var(--brief-bg);
  transition: border-color 0.18s ease, background 0.18s ease;
}

.brief-form-row input:focus,
.brief-form-row textarea:focus {
  outline: none;
  border-color: var(--brief-primary);
  background: var(--brief-surface);
}

.brief-form-row textarea {
  min-height: 140px;
  resize: vertical;
}

.brief-form-note {
  font-size: 0.82rem;
  color: var(--brief-text-muted);
  margin-bottom: 18px;
}

.brief-form-submit {
  width: 100%;
}

.brief-map-wrap {
  margin-top: 40px;
  border: 1px solid var(--brief-border);
  border-radius: var(--brief-radius-card);
  overflow: hidden;
  box-shadow: var(--brief-shadow-card);
}

.brief-map-wrap iframe {
  width: 100%;
  height: 420px;
  border: 0;
  display: block;
}

.brief-legal-layout {
  padding: 64px 0;
}

.brief-legal-layout h1 {
  margin-bottom: 10px;
}

.brief-legal-layout .brief-legal-meta {
  font-family: var(--brief-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--brief-text-muted);
  margin-bottom: 36px;
}

.brief-legal-layout section {
  padding: 20px 0;
  border-bottom: 1px solid var(--brief-border);
}

.brief-legal-layout section:last-of-type {
  border-bottom: none;
}

.brief-legal-layout h2 {
  font-size: 1.25rem;
}

.brief-cookie-modal {
  position: fixed;
  right: 24px;
  bottom: 24px;
  max-width: 420px;
  background: var(--brief-surface);
  border: 1px solid var(--brief-border-strong);
  border-radius: var(--brief-radius-card);
  box-shadow: 0 12px 32px rgba(15, 37, 64, 0.22);
  padding: 22px 24px;
  z-index: 100;
  display: none;
}

.brief-cookie-modal.is-visible {
  display: block;
}

.brief-cookie-modal h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  color: var(--brief-primary);
}

.brief-cookie-modal p {
  font-size: 0.88rem;
  color: var(--brief-text-muted);
  margin: 0 0 18px;
  line-height: 1.7;
}

.brief-cookie-modal .brief-cookie-actions {
  display: flex;
  gap: 10px;
}

.brief-cookie-modal button {
  flex: 1;
  padding: 10px 14px;
  font-size: 0.88rem;
  font-family: var(--brief-sans);
  border-radius: var(--brief-radius);
  cursor: pointer;
}

.brief-cookie-accept {
  background: var(--brief-primary);
  color: #F5F2ED;
  border: 1px solid var(--brief-primary);
}

.brief-cookie-accept:hover {
  background: var(--brief-accent-deep);
  border-color: var(--brief-accent-deep);
}

.brief-cookie-reject {
  background: transparent;
  color: var(--brief-primary);
  border: 1px solid var(--brief-border-strong);
}

.brief-cookie-reject:hover {
  background: var(--brief-bg-alt);
}

.brief-cookie-modal a {
  color: var(--brief-accent-deep);
  text-decoration: underline;
}

.brief-success-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 37, 64, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 120;
  padding: 24px;
}

.brief-success-modal.is-visible {
  display: flex;
}

.brief-success-card {
  background: var(--brief-surface);
  max-width: 440px;
  width: 100%;
  padding: 32px;
  border-radius: var(--brief-radius-card);
  text-align: center;
  box-shadow: 0 20px 48px rgba(15, 37, 64, 0.3);
}

.brief-success-card i {
  font-size: 2.4rem;
  color: var(--brief-accent-deep);
  margin-bottom: 12px;
}

.brief-success-card h3 {
  margin-bottom: 10px;
}

.brief-success-card p {
  color: var(--brief-text-muted);
  font-size: 0.95rem;
}

.brief-testimonials {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.brief-small-caption {
  font-size: 0.78rem;
  color: var(--brief-text-muted);
  letter-spacing: 0.04em;
  margin-top: 24px;
  text-align: center;
}

.brief-glossary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.brief-glossary dt {
  font-weight: 600;
  color: var(--brief-primary);
  margin-top: 12px;
}

.brief-glossary dd {
  margin-left: 0;
  color: var(--brief-text-muted);
  font-size: 0.94rem;
}

@media (max-width: 960px) {
  .brief-menu-toggle {
    display: inline-flex;
  }
  .brief-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--brief-surface);
    padding: 14px;
    border-bottom: 1px solid var(--brief-border);
    display: none;
  }
  .brief-nav.is-open {
    display: flex;
  }
  .brief-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    margin-top: 0;
    box-shadow: none;
    border: none;
    background: var(--brief-bg-alt);
    padding: 4px 0 0 14px;
    display: none;
  }
  .brief-nav > li.is-open .brief-dropdown {
    display: block;
  }
  .brief-header .brief-cta-button {
    width: 100%;
    justify-content: center;
  }
  .brief-hero {
    min-height: 380px;
    padding: 48px 0;
  }
  .brief-hero h1 {
    font-size: 1.8rem;
  }
  .brief-about-grid,
  .brief-mission,
  .brief-contact-grid {
    grid-template-columns: 1fr;
  }
  .brief-advantages,
  .brief-article-grid,
  .brief-methodology,
  .brief-list-grid,
  .brief-footer-columns,
  .brief-testimonials,
  .brief-glossary,
  .brief-about-principles {
    grid-template-columns: 1fr;
  }
  .brief-cookie-modal {
    left: 12px;
    right: 12px;
    bottom: 12px;
    max-width: none;
  }
  .brief-prev-next {
    grid-template-columns: 1fr;
  }
  .brief-prev-next a.align-right {
    text-align: left;
  }
}

@media (max-width: 600px) {
  .brief-section {
    padding: 52px 0;
  }
  .brief-form-card {
    padding: 24px;
  }
  .brief-map-wrap iframe {
    height: 320px;
  }
}

.brief-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}