/* === Honda Global Font & Noto Sans JP === */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

body {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-regular);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  overflow-x: hidden;
  letter-spacing: var(--letter-spacing-body);
}

main {
  padding-top: var(--header-height);
}

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

/* ===== Skip Navigation (Accessibility Guideline 2-21) ===== */
.skip-nav {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  background: var(--color-honda-red);
  color: var(--color-white);
  padding: 12px 24px;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-bold);
  border-radius: var(--button-border-radius);
  transition: top 0.2s ease;
}
.skip-nav:focus {
  top: 16px;
}

/* ===== Focus Styles (Accessibility Guideline 2-22) ===== */
:focus-visible {
  outline: 2px solid var(--color-honda-red);
  outline-offset: 2px;
}
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-honda-red);
  outline-offset: 2px;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-header);
  transition: background 0.3s ease;
  background: transparent;
}
.site-header.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 1px 8px rgba(0,0,0,0.08);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}
.header-logo img { height: 28px; filter: brightness(0); }
.header-nav .nav-list {
  display: flex;
  gap: 32px;
}
.header-nav .nav-list a {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  letter-spacing: 0.5px;
  transition: var(--transition-default);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}
.header-nav .nav-list a:hover,
.header-nav .nav-list a:focus-visible,
.header-nav .nav-list a.active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-honda-red);
}
.header-actions { display: flex; align-items: center; gap: 16px; }
.header-rd-link {
  font-size: var(--font-size-caption);
  color: var(--color-text-muted);
  transition: var(--transition-default);
}
.header-rd-link:hover { color: var(--color-honda-red); }

/* Lang Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  cursor: pointer;
}
.lang-toggle .lang-label { transition: var(--transition-default); }
.lang-toggle .lang-label.active { color: var(--color-text-primary); font-weight: var(--font-weight-bold); }
.lang-toggle .lang-divider { color: var(--color-text-dim); }

/* Mobile Menu */
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; width: 28px; padding: 4px 0; }
.mobile-menu-btn span {
  display: block;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: var(--transition-default);
}
.mobile-menu-btn.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-btn.open span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Footer (aligned with RandD template) ===== */
.site-footer {
  background: var(--color-bg-dark);
  border-top: 1px solid var(--color-border);
  padding: 40px 0 32px;
}
.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--container-padding);
}
.footer-logo {
  margin-bottom: 24px;
}
.footer-logo img {
  height: 24px;
}
.footer-links {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.footer-label {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-bold);
  letter-spacing: 2px;
}
.footer-links a {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  transition: var(--transition-default);
}
.footer-links a:hover,
.footer-links a:focus-visible { color: var(--color-honda-red); }
.footer-policy {
  display: flex;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.footer-policy a {
  font-size: var(--font-size-caption);
  color: var(--color-text-muted);
  transition: var(--transition-default);
}
.footer-policy a:hover,
.footer-policy a:focus-visible { color: var(--color-honda-red); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-copyright { font-size: var(--font-size-caption); color: var(--color-text-dim); }
.footer-lang-toggle { display: flex; align-items: center; gap: 8px; font-size: var(--font-size-small); color: var(--color-text-muted); }
.toggle-switch { position: relative; display: inline-block; width: 40px; height: 22px; }
.toggle-switch input { display: none; }
.toggle-slider {
  position: absolute; inset: 0; background: var(--color-border);
  border-radius: 22px; cursor: pointer; transition: var(--transition-default);
}
.toggle-slider::before {
  content: ''; position: absolute; height: 16px; width: 16px;
  left: 3px; bottom: 3px; background: white;
  border-radius: 50%; transition: var(--transition-default);
}
.toggle-switch input:checked + .toggle-slider { background: var(--color-honda-red); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(18px); }

/* ===== External Link Icon (Accessibility Guideline 2-20) ===== */
.external-link::after {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: 4px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2'%3E%3Cpath d='M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6'/%3E%3Cpolyline points='15 3 21 3 21 9'/%3E%3Cline x1='10' y1='14' x2='21' y2='3'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  vertical-align: middle;
}

/* ===== Breadcrumb (Honda RandD Template) ===== */
.breadcrumb {
  font-size: var(--font-size-caption);
  color: var(--color-text-dim);
  margin-bottom: 16px;
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
}
.breadcrumb li::after {
  content: '>';
  margin: 0 8px;
  color: var(--color-text-dim);
}
.breadcrumb li:last-child::after { content: none; }
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--color-honda-red); }

/* ===== Buttons ===== */
.btn-primary {
  display: inline-block;
  background: var(--color-honda-red);
  color: var(--color-white);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-bold);
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 14px 32px;
  border-radius: var(--button-border-radius);
  transition: var(--transition-default);
  border: none;
  cursor: pointer;
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-honda-red-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(204,0,0,0.4);
}
.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--color-text-primary);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-bold);
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 14px 32px;
  border-radius: var(--button-border-radius);
  border: 1px solid var(--color-border-light);
  transition: var(--transition-default);
  cursor: pointer;
}
.btn-secondary:hover,
.btn-secondary:focus-visible { background: rgba(0,0,0,0.05); }

/* ===== Section Title ===== */
.section-title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading);
  margin-bottom: 48px;
}

/* ===== Video Modal ===== */
.video-modal {
  position: fixed; inset: 0; z-index: var(--z-modal);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transition: var(--transition-default);
}
.video-modal.active { opacity: 1; visibility: visible; }
.video-modal-overlay { position: absolute; inset: 0; background: var(--color-overlay-dark); }
.video-modal-content {
  position: relative; width: 90vw; max-width: 900px;
  transform: scale(0.9); transition: transform 0.3s ease;
}
.video-modal.active .video-modal-content { transform: scale(1); }
.video-modal-close {
  position: absolute; top: -48px; right: 0;
  color: #FFFFFF; font-size: 32px;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
}
.video-modal-close:hover,
.video-modal-close:focus-visible { color: var(--color-honda-red); }
.video-modal video { width: 100%; aspect-ratio: 16/9; background: #000; border-radius: 4px; }
.video-modal-title {
  color: var(--color-text-secondary);
  font-size: var(--font-size-body);
  margin-top: 12px; text-align: center;
}

/* ===== Play Button ===== */
.play-btn, .play-btn-sm {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%; display: flex;
  align-items: center; justify-content: center;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(4px);
  transition: var(--transition-default);
}
.play-btn { width: 72px; height: 72px; }
.play-btn-sm { width: 56px; height: 56px; }
.play-btn::after, .play-btn-sm::after {
  content: '';
  border-style: solid;
  border-color: transparent transparent transparent white;
}
.play-btn::after { border-width: 12px 0 12px 20px; margin-left: 4px; }
.play-btn-sm::after { border-width: 9px 0 9px 15px; margin-left: 3px; }
.play-btn:hover, .play-btn-sm:hover { background: rgba(255,255,255,0.35); transform: translate(-50%, -50%) scale(1.1); }

/* ===== Page Hero (sub pages) ===== */
.page-hero {
  padding: 136px 0 56px;
  background: var(--color-bg-secondary);
}
.page-hero .container { max-width: var(--container-width); margin: 0 auto; padding: var(--container-padding); }
.page-hero-title {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
  margin-bottom: 8px;
}
.page-hero-sub { font-size: var(--font-size-body); color: var(--color-text-muted); }

/* ===== Scroll Animation ===== */
.fade-in {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }