@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;1,400&family=Noto+Sans+JP:wght@300;400;500;600;700&family=Noto+Serif+JP:wght@400;500;600&display=swap');

:root {
  --bg-ivory: #F4F3EE;
  --bg-ivory-alt: #EAE8E0;
  --bg-card: #FAF9F5;
  --bg-white: #FFFFFF;
  --green-deep: #12372A;
  --green-darker: #0C261D;
  --green-mid: #1F4E3D;
  --green-muted: #4A665B;
  --green-tint: #E6ECE8;
  --accent-lime: #C5DB32;
  --accent-lime-hover: #B5CB22;
  --text-main: #12372A;
  --text-body: #233830;
  --text-muted: #586B63;
  --text-light: #F4F3EE;
  --border-line: rgba(18, 55, 42, 0.22);
  --border-strong: rgba(18, 55, 42, 0.45);
  --border-light: rgba(244, 243, 238, 0.22);
  --font-serif-en: 'Cormorant Garamond', Georgia, serif;
  --font-serif-jp: 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1200px;
  --header-height: 82px;
  --radius-sm: 2px;
  --shadow-subtle: 0 8px 28px rgba(18, 55, 42, 0.06);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-ivory);
  color: var(--text-body);
  font-family: var(--font-sans);
  line-height: 1.8;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }
}

/* ==========================================
   Typography & Editorial Utilities
   ========================================== */
.en-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-deep);
}

.en-label::before {
  content: "";
  display: inline-block;
  width: 11px;
  height: 11px;
  background-color: var(--accent-lime);
  flex-shrink: 0;
}

.en-label--line::before {
  display: none;
}

.en-label--line {
  position: relative;
  padding-bottom: 12px;
  margin-bottom: 18px;
}

.en-label--line::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 44px;
  height: 1.5px;
  background-color: currentColor;
}

.serif-en {
  font-family: var(--font-serif-en);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  border-radius: var(--radius-sm);
  background-color: var(--green-tint);
  color: var(--green-deep);
  border: 1px solid var(--border-line);
}

.status-badge--concept {
  background-color: rgba(18, 55, 42, 0.85);
  color: var(--bg-ivory);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.status-badge--active {
  background-color: var(--accent-lime);
  color: var(--green-darker);
  border-color: transparent;
}

/* ==========================================
   Header & Navigation (Section 5)
   ========================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(244, 243, 238, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-line);
  height: var(--header-height);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-logo {
  font-family: var(--font-serif-en);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--green-deep);
  letter-spacing: 0.03em;
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
}

.site-logo span.logo-sub {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--green-deep);
  padding: 8px 0;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--green-mid);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--green-deep);
}

/* Dropdown for 事業紹介 */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: -16px;
  min-width: 270px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  box-shadow: var(--shadow-subtle);
  padding: 10px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: all 0.2s ease;
}

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

.dropdown-link {
  display: block;
  padding: 10px 20px;
  font-size: 0.86rem;
  color: var(--text-body);
  border-left: 3px solid transparent;
}

.dropdown-link:hover {
  background-color: var(--green-tint);
  border-left-color: var(--green-deep);
}

.dropdown-link strong {
  display: block;
  font-weight: 600;
  color: var(--green-deep);
}

.dropdown-link span {
  font-size: 0.74rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.lang-switch {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  padding-left: 16px;
  border-left: 1px solid var(--border-line);
  letter-spacing: 0.06em;
}

.lang-switch a:hover {
  color: var(--green-deep);
  text-decoration: underline;
}

.btn-header-contact {
  background-color: var(--green-deep);
  color: var(--bg-ivory);
  font-size: 0.86rem;
  font-weight: 500;
  padding: 11px 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-sm);
}

.btn-header-contact:hover {
  background-color: var(--green-mid);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-line);
  color: var(--green-deep);
  padding: 8px 12px;
  font-size: 0.85rem;
  cursor: pointer;
}

/* ==========================================
   Buttons & CTAs
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 28px;
  font-size: 0.94rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  line-height: 1.4;
}

.btn-primary {
  background-color: var(--green-deep);
  color: var(--bg-ivory);
  border-color: var(--green-deep);
}

.btn-primary:hover {
  background-color: var(--green-mid);
  border-color: var(--green-mid);
}

.btn-secondary {
  background-color: transparent;
  color: var(--green-deep);
  border-color: var(--green-deep);
}

.btn-secondary:hover {
  background-color: var(--green-tint);
}

.btn-light {
  background-color: transparent;
  color: var(--bg-ivory);
  border-color: rgba(244, 243, 238, 0.7);
}

.btn-light:hover {
  background-color: rgba(244, 243, 238, 0.12);
  border-color: var(--bg-ivory);
}

.btn-lime-combo {
  display: inline-flex;
  align-items: stretch;
  gap: 8px;
}

.btn-lime-combo .lime-box {
  width: 48px;
  background-color: var(--accent-lime);
  color: var(--green-darker);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.btn-lime-combo:hover .lime-box {
  background-color: var(--accent-lime-hover);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--green-deep);
  border-bottom: 1px solid var(--green-deep);
  padding-bottom: 2px;
}

.text-link:hover {
  color: var(--green-mid);
  border-bottom-color: transparent;
}

/* ==========================================
   Hero / First View (B案 Layout Adapted)
   ========================================== */
.hero-section {
  padding-top: 48px;
  padding-bottom: 0;
}

.hero-top-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 48px;
  align-items: end;
  padding-bottom: 40px;
}

.hero-subcopy-en {
  font-family: var(--font-serif-en);
  font-size: 1.35rem;
  color: var(--green-muted);
  margin-top: 10px;
  margin-bottom: 8px;
  font-style: italic;
}

.hero-main-title {
  font-family: var(--font-serif-jp);
  font-size: clamp(2.1rem, 3.8vw, 3.35rem);
  font-weight: 600;
  color: var(--green-deep);
  line-height: 1.32;
  letter-spacing: 0.02em;
}

.hero-right-col {
  border-left: 1px solid var(--border-strong);
  padding-left: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-lead {
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.85;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero-aux-link {
  margin-top: 4px;
}

/* Full-bleed / Wide Concept Visual with dual photos */
.hero-visual-wrapper {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 40px;
}

.hero-visual-frame {
  position: relative;
  border: 1px solid var(--border-line);
  background-color: var(--green-darker);
  overflow: hidden;
}

.hero-visual-main {
  width: 100%;
  height: 410px;
  object-fit: cover;
  object-position: center;
  display: block;
}

.hero-visual-overlay-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 20px;
  background-color: rgba(18, 55, 42, 0.94);
  color: var(--bg-ivory);
  padding: 16px 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-visual-caption {
  display: flex;
   flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: rgba(244, 243, 238, 0.88);
}

.hero-sub-thumbs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border-line);
  background-color: var(--bg-card);
}

.hero-thumb-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 22px;
  border-right: 1px solid var(--border-line);
}

.hero-thumb-item:last-child {
  border-right: none;
}

.hero-thumb-item img {
  width: 88px;
  height: 56px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.hero-thumb-text strong {
  display: block;
  font-size: 0.86rem;
  color: var(--green-deep);
}

.hero-thumb-text span {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ==========================================
   Section Layout & Editorial Grid (B案 style)
   ========================================== */
.section {
  padding: 88px 0;
  border-bottom: 1px solid var(--border-line);
}

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

.section--dark {
  background-color: var(--green-deep);
  color: var(--bg-ivory);
  border-bottom-color: var(--border-light);
}

.editorial-split {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 56px;
  align-items: start;
}

.editorial-side {
  position: sticky;
  top: 110px;
}

.section-title-jp {
  font-family: var(--font-serif-jp);
  font-size: clamp(1.55rem, 2.4vw, 2.15rem);
  font-weight: 600;
  color: var(--green-deep);
  line-height: 1.45;
  margin-bottom: 16px;
}

.section--dark .section-title-jp {
  color: var(--bg-ivory);
}

.section-lead {
  font-size: 0.96rem;
  color: var(--text-body);
  margin-bottom: 24px;
}

.section--dark .section-lead {
  color: rgba(244, 243, 238, 0.85);
}

/* ==========================================
   Business Row Cards (Adapted from B案 01/02/03)
   ========================================== */
.biz-list {
  border-top: 1px solid var(--border-strong);
}

.biz-row {
  display: grid;
  grid-template-columns: 52px 1fr 300px;
  gap: 28px;
  align-items: center;
  padding: 36px 0;
  border-bottom: 1px solid var(--border-strong);
  transition: background-color 0.2s ease;
}

.biz-num {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--green-deep);
  align-self: start;
  padding-top: 8px;
}

.biz-title-main {
  font-family: var(--font-serif-jp);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--green-deep);
  line-height: 1.3;
  margin-bottom: 6px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.biz-title-en {
  font-family: var(--font-serif-en);
  font-size: 1.25rem;
  color: var(--text-muted);
  font-weight: 400;
}

.biz-desc {
  font-size: 0.95rem;
  color: var(--text-body);
  margin: 12px 0 16px;
}

.biz-tags {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

.biz-photo img {
  width: 100%;
  height: 165px;
  object-fit: cover;
  border: 1px solid var(--border-line);
}

/* ==========================================
   Concept Architecture / System Diagrams
   ========================================== */
.concept-diagram-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  padding: 36px;
  margin-top: 24px;
}

.diagram-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-line);
  margin-bottom: 28px;
}

.diagram-layers {
  display: grid;
  gap: 18px;
}

.diagram-layer {
  border: 1px solid var(--border-line);
  background-color: var(--bg-white);
  padding: 20px 24px;
}

.diagram-layer--highlight {
  background-color: var(--green-deep);
  color: var(--bg-ivory);
  border-color: var(--green-deep);
}

.diagram-layer-title {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.diagram-nodes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
  gap: 12px;
}

.diagram-node {
  background-color: var(--bg-ivory);
  color: var(--text-body);
  padding: 12px 14px;
  border: 1px solid var(--border-line);
  font-size: 0.84rem;
}

.diagram-node strong {
  display: block;
  color: var(--green-deep);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

/* ==========================================
   Cards, Tables & Process Steps
   ========================================== */
.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.info-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.info-card--white {
  background-color: var(--bg-white);
}

.info-card-header {
  margin-bottom: 16px;
}

.info-card-title {
  font-family: var(--font-serif-jp);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--green-deep);
  margin: 8px 0 12px;
}

/* Process Flow (Section 3 #7) */
.step-flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.step-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  padding: 24px 20px;
  position: relative;
}

.step-num {
  font-family: var(--font-serif-en);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--green-deep);
  line-height: 1;
  margin-bottom: 10px;
  display: block;
}

.step-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--green-deep);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Tables */
.spec-table-wrap {
  overflow-x: auto;
  margin: 20px 0;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-white);
  border: 1px solid var(--border-line);
  font-size: 0.9rem;
}

.spec-table th,
.spec-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-line);
  text-align: left;
  vertical-align: top;
}

.spec-table th {
  background-color: var(--green-tint);
  color: var(--green-deep);
  font-weight: 600;
  width: 26%;
}

/* FAQ Accordion */
.faq-list {
  border-top: 1px solid var(--border-strong);
}

.faq-item {
  border-bottom: 1px solid var(--border-line);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 22px 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--green-deep);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  cursor: pointer;
}

.faq-question::before {
  content: "Q.";
  font-family: var(--font-serif-en);
  font-size: 1.35rem;
  color: var(--green-mid);
  margin-right: 10px;
}

.faq-question span.q-text {
  flex: 1;
}

.faq-toggle-icon {
  font-size: 1.2rem;
  color: var(--green-deep);
  transition: transform 0.2s ease;
}

.faq-item.open .faq-toggle-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 0 24px 34px;
  font-size: 0.94rem;
  color: var(--text-body);
}

.faq-item.open .faq-answer {
  display: block;
}

/* ==========================================
   Page Header (Subpages)
   ========================================== */
.page-hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--border-strong);
  background-color: var(--bg-ivory);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumb a:hover {
  color: var(--green-deep);
  text-decoration: underline;
}

.page-title {
  font-family: var(--font-serif-jp);
  font-size: clamp(1.9rem, 3.2vw, 2.75rem);
  font-weight: 600;
  color: var(--green-deep);
  line-height: 1.35;
  margin: 10px 0 18px;
}

.page-lead {
  font-size: 1.04rem;
  color: var(--text-body);
  max-width: 820px;
  line-height: 1.85;
}

/* ==========================================
   Forms (Section 7 Contact Design)
   ========================================== */
.contact-category-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.category-tab {
  background-color: var(--bg-card);
  border: 1.5px solid var(--border-line);
  padding: 18px 16px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  border-radius: var(--radius-sm);
}

.category-tab:hover {
  border-color: var(--green-deep);
}

.category-tab.active {
  background-color: var(--green-deep);
  color: var(--bg-ivory);
  border-color: var(--green-deep);
}

.category-tab strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.category-tab span {
  font-size: 0.76rem;
  opacity: 0.82;
}

.form-box {
  background-color: var(--bg-white);
  border: 1px solid var(--border-strong);
  padding: 44px;
}

.form-grid {
  display: grid;
  gap: 24px;
}

.form-group label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--green-deep);
  margin-bottom: 8px;
}

.badge-req {
  background-color: var(--green-deep);
  color: var(--bg-ivory);
  font-size: 0.7rem;
  padding: 2px 8px;
  font-weight: 500;
}

.badge-opt {
  background-color: var(--bg-ivory-alt);
  color: var(--text-muted);
  font-size: 0.7rem;
  padding: 2px 8px;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 13px 16px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text-body);
  background-color: var(--bg-ivory);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
}

.form-control:focus {
  outline: none;
  border-color: var(--green-deep);
  background-color: var(--bg-white);
}

.form-help {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ==========================================
   Footer & Bottom Banner (B案 Dark Green Banner)
   ========================================== */
.cta-banner-dark {
  background-color: var(--green-deep);
  color: var(--bg-ivory);
  padding: 72px 0;
}

.cta-banner-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 32px;
}

.site-footer {
  background-color: var(--bg-ivory);
  border-top: 1px solid var(--border-line);
  padding: 56px 0 36px;
  font-size: 0.86rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border-line);
}

.footer-col h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--green-deep);
  margin-bottom: 14px;
}

.footer-col ul li {
  margin-bottom: 9px;
}

.footer-col ul li a {
  color: var(--text-muted);
}

.footer-col ul li a:hover {
  color: var(--green-deep);
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ==========================================
   Responsive Design (Section 4 Mobile Order)
   ========================================== */
@media (max-width: 992px) {
  .hero-top-grid,
  .editorial-split,
  .card-grid-3,
  .card-grid-4,
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .editorial-side {
    position: static;
  }

  .hero-right-col {
    border-left: none;
    border-top: 1px solid var(--border-line);
    padding-left: 0;
    padding-top: 24px;
  }

  .biz-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .contact-category-tabs {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .main-nav,
  .header-actions .lang-switch {
    display: none;
  }

  .mobile-menu-toggle {
    display: inline-block;
  }

  body.nav-open .main-nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--bg-ivory);
    border-bottom: 1px solid var(--border-strong);
    padding: 20px;
    align-items: flex-start;
    gap: 16px;
    box-shadow: var(--shadow-subtle);
  }

  body.nav-open .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: 16px;
    background: transparent;
  }

  .card-grid-2,
  .step-flow,
  .contact-category-tabs,
  .hero-sub-thumbs {
    grid-template-columns: 1fr;
  }

  .hero-thumb-item {
    border-right: none;
    border-bottom: 1px solid var(--border-line);
  }

  .hero-visual-main {
    height: 260px;
  }

  .form-box {
    padding: 24px 18px;
  }
}