:root {
    --color-bg-base: #ffffff;
    --color-bg-card: #ffffff;
    --color-bg-subtle: #faf8f5;
    --color-text-main: #1a1a1a;
    --color-text-sub: #4d4d4d;
    --color-accent-gold: #8f6a17;
    --color-accent-hover: #6f5015;
    --color-border: #d8d3c4;
    --font-jp: 'Noto Sans JP', sans-serif;
    --font-en: 'Poppins', sans-serif;
    --shadow-subtle: 0 6px 24px rgba(0, 0, 0, 0.09);
    --shadow-hover: 0 14px 36px rgba(0, 0, 0, 0.16);
  }
  html[data-theme="dark"] {
    --color-bg-base: #15171a;
    --color-bg-card: #1f2227;
    --color-bg-subtle: #282b30;
    --color-text-main: #f2efe9;
    --color-text-sub: #b7b3aa;
    --color-accent-gold: #d4ac5c;
    --color-accent-hover: #e6c176;
    --color-border: #3a3a38;
    --shadow-subtle: 0 6px 24px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 14px 36px rgba(0, 0, 0, 0.45);
  }
  html[data-theme="dark"] .site-header { background-color: rgba(21,23,26,0.92); }
  html[data-theme="dark"] .site-header img.logo { filter: brightness(0) invert(1); }
  html[data-theme="dark"] #seaStopTop { stop-color: #1c3d52; }
  html[data-theme="dark"] #seaStopBottom { stop-color: #0a1c2b; }
  html[data-theme="dark"] #waveStopTop { stop-color: #1c3d52; }
  html[data-theme="dark"] #waveStopBottom { stop-color: #0a1c2b; }
  .landmark-light { opacity: 0; }
  html[data-theme="dark"] .landmark-light {
    animation: landmark-glow 2.6s ease-in-out infinite;
    filter: drop-shadow(0 0 5px rgba(255,240,200,1)) drop-shadow(0 0 3px rgba(255,255,255,0.9));
  }
  html[data-theme="dark"] .landmark-lights-brick .landmark-light {
    filter: drop-shadow(0 0 5px rgba(224,120,80,1)) drop-shadow(0 0 3px rgba(230,160,130,0.9));
  }
  html[data-theme="dark"] .brick-warehouse-fill {
    color: #823a24;
    filter: drop-shadow(0 0 10px rgba(130,58,36,0.55));
  }
  html:not([data-theme="dark"]) .brick-warehouse-fill {
    color: #823a24;
  }
  @keyframes landmark-glow {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
  }
  html[data-theme="dark"] .ship-windows rect { fill: #fff3d6; }
  html[data-theme="dark"] .ship-windows {
    filter: drop-shadow(0 0 2px rgba(255,240,200,0.9));
  }
  @media (prefers-reduced-motion: reduce) {
    html[data-theme="dark"] .landmark-light { animation: none; opacity: 0.75; }
  }
  .theme-switch {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 3px;
    border-radius: 20px;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
  }
  .theme-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--color-text-sub);
    cursor: pointer;
    opacity: 0.45;
    transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease, transform 0.25s ease;
  }
  .theme-btn svg { width: 16px; height: 16px; }
  .theme-btn:hover { opacity: 0.8; }
  .theme-btn-light {
    background: var(--color-accent-gold);
    color: #ffffff;
    opacity: 1;
    box-shadow: 0 0 10px rgba(143,106,23,0.55);
    transform: scale(1.06);
  }
  html[data-theme="dark"] .theme-btn-light {
    background: transparent;
    color: var(--color-text-sub);
    opacity: 0.4;
    box-shadow: none;
    transform: scale(1);
  }
  html[data-theme="dark"] .theme-btn-dark {
    background: #2a2d33;
    color: #ffd98a;
    opacity: 1;
    box-shadow: 0 0 10px rgba(255,217,138,0.5);
    transform: scale(1.06);
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font-jp);
    background-color: var(--color-bg-base);
    background-image:
      radial-gradient(ellipse 900px 650px at 8% 3%, rgba(22,80,168,0.07), transparent 60%),
      radial-gradient(ellipse 800px 650px at 95% 12%, rgba(201,74,31,0.06), transparent 60%),
      radial-gradient(ellipse 950px 750px at 4% 42%, rgba(11,128,88,0.06), transparent 60%),
      radial-gradient(ellipse 850px 700px at 96% 48%, rgba(114,56,181,0.06), transparent 60%),
      radial-gradient(ellipse 950px 750px at 10% 78%, rgba(143,106,23,0.07), transparent 60%),
      radial-gradient(ellipse 900px 700px at 92% 92%, rgba(44,79,104,0.06), transparent 60%);
    background-repeat: no-repeat;
    color: var(--color-text-main);
    line-height: 1.8;
  }
  img { max-width: 100%; display: block; }
  a { color: inherit; }
  .container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
  section { padding: 100px 0; }
  /* Light mode: solid white background throughout. Dark mode is unchanged. */
  html:not([data-theme="dark"]) body {
    background-color: #ffffff;
    background-image: none;
  }
  html:not([data-theme="dark"]) .page-hero ~ section {
    position: relative;
  }
  html:not([data-theme="dark"]) .page-hero ~ section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    height: 100%;
    background: #ffffff;
    z-index: -2;
    pointer-events: none;
  }
  html:not([data-theme="dark"]) .wave-divider {
    background-color: #ffffff;
  }

  /* HEADER */
  .site-header { position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(6px); border-bottom: 1px solid var(--color-border); }
  .header-inner { max-width: 1120px; margin: 0 auto; padding: 16px 24px; display: flex; align-items: center; justify-content: space-between; }
  .site-header img.logo { height: 36px; width: auto; }
  .main-nav { display: flex; gap: 32px; align-items: center; }
  .main-nav a {
    text-decoration: none; font-size: 0.9rem; font-weight: 500; color: var(--color-text-main);
    position: relative; padding-bottom: 4px;
    opacity: 0; animation: nav-fade-in 0.6s ease forwards;
  }
  .main-nav a:nth-child(1) { animation-delay: 0.05s; }
  .main-nav a:nth-child(2) { animation-delay: 0.1s; }
  .main-nav a:nth-child(3) { animation-delay: 0.15s; }
  .main-nav a:nth-child(4) { animation-delay: 0.2s; }
  .main-nav a:nth-child(5) { animation-delay: 0.25s; }
  .main-nav a:nth-child(6) { animation-delay: 0.3s; }
  @keyframes nav-fade-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }
  .main-nav a .nav-num { font-family: var(--font-en); color: var(--color-accent-gold); font-size: 0.75rem; margin-right: 4px; }
  .main-nav a::after { content: ''; position: absolute; left: 0; bottom: 0; width: 0; height: 1px; background: var(--color-accent-gold); transition: width 0.25s ease; }
  .main-nav a:hover::after { width: 100%; }
  .main-nav a.active::after { width: 100%; }
  @media (prefers-reduced-motion: reduce) {
    .main-nav a { animation: none; opacity: 1; }
  }
  .nav-cta {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-accent-gold);
    color: #fff !important;
    padding: 10px 22px;
    border-radius: 50px;
    font-size: 0.85rem !important;
    font-weight: 700 !important;
    overflow: hidden;
    box-shadow: 0 0 0 0 rgba(143,106,23,0.45);
    transition: background 0.3s ease;
  }
  .main-nav .nav-cta {
    animation: cta-breathe 3.2s ease-in-out infinite, nav-fade-in 0.6s ease forwards;
    animation-delay: 0.3s, 0.3s;
  }
  .nav-cta::before {
    content: '';
    position: absolute;
    top: 0; left: -60%;
    width: 40%; height: 100%;
    background: linear-gradient(115deg, transparent, rgba(255,255,255,0.55), transparent);
    transform: skewX(-20deg);
    transition: left 0.6s ease;
  }
  .nav-cta:hover::before { left: 130%; }
  @keyframes cta-breathe {
    0%, 100% { box-shadow: 0 0 0 0 rgba(143,106,23,0.35); }
    50% { box-shadow: 0 0 0 6px rgba(143,106,23,0); }
  }
  .nav-cta::after { display: none; }
  .nav-cta:hover { background: var(--color-accent-hover); }
  @media (prefers-reduced-motion: reduce) {
    .nav-cta { animation: none; }
    .nav-cta::before { transition: none; left: -60%; }
  }
  .menu-toggle { display: none; background: none; border: none; font-size: 1.4rem; cursor: pointer; }
  .theme-switch-mobile { display: none; }
  @media (max-width: 900px) {
    .main-nav {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background: var(--color-bg-base);
      flex-direction: column;
      align-items: flex-start;
      gap: 0;
      padding: 8px 24px 16px;
      border-bottom: 1px solid var(--color-border);
      box-shadow: 0 8px 16px rgba(0,0,0,0.06);
    }
    .main-nav.is-open { display: flex; }
    .main-nav a { padding: 12px 0; width: 100%; }
    .main-nav a::after { display: none; }
    .nav-cta { margin-top: 8px; text-align: center; justify-content: center; }
    .menu-toggle { display: block; }
    .main-nav .theme-switch { display: none; }
    .theme-switch-mobile { display: inline-flex; }
  }

  /* BREADCRUMB / PAGE HEADER */
  .page-hero { position: relative; padding: 40px 0 0 0; overflow: hidden; text-align: center; }
  .breadcrumb { font-size: 0.8rem; color: var(--color-text-sub); margin-bottom: 24px; text-align: left; padding: 0 24px; max-width: 1120px; margin-left: auto; margin-right: auto; }
  .breadcrumb a { text-decoration: none; color: var(--color-text-sub); }
  .breadcrumb a:hover { color: var(--color-accent-gold); }
  .page-label { font-family: var(--font-en); font-size: 0.9rem; font-weight: 600; color: var(--color-accent-gold); letter-spacing: 0.2em; text-transform: uppercase; display: block; margin-bottom: 8px; }
  .page-title { font-size: 2.2rem; font-weight: 700; letter-spacing: 0.05em; margin-bottom: 24px; }
  .signature-rule {
    height: 6px;
    max-width: 180px;
    margin: -14px auto 24px auto;
    background-image: radial-gradient(circle, var(--color-accent-gold) 2px, transparent 2.2px);
    background-size: 14px 6px;
    background-repeat: repeat-x;
    background-position: center;
    opacity: 0.55;
  }
  .page-lead { color: var(--color-text-sub); font-size: 0.95rem; max-width: 640px; margin: 0 auto 8px auto; text-align: left; }

  /* CONTACT LAYOUT */
  .contact-layout { display: grid; grid-template-columns: 1fr 1.4fr; gap: 40px; align-items: start; }

  /* INFO SIDE */
  .contact-info-card { background: var(--color-bg-card); border-radius: 16px; padding: 40px; border: 1px solid var(--color-border); border-top: 3px solid #1650a8; box-shadow: var(--shadow-subtle); }
  .contact-info-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 20px; }
  .contact-info-card p { font-size: 0.875rem; color: var(--color-text-sub); margin-bottom: 12px; }
  .info-divider { border-top: 1px solid var(--color-border); margin: 24px 0; }
  .link-list { display: grid; gap: 10px; }
  .link-list a { font-size: 0.875rem; text-decoration: none; color: var(--color-text-main); display: flex; align-items: center; gap: 8px; }
  .link-list a:hover { color: var(--color-accent-gold); }
  .link-list a::before { content: '›'; color: var(--color-accent-gold); font-weight: 700; }

  /* FORM CARD */
  .form-card { background: var(--color-bg-card); border-radius: 16px; padding: 48px; border: 1px solid var(--color-border); border-top: 3px solid #0b8058; box-shadow: var(--shadow-subtle); }
  .form-note { font-size: 0.8rem; color: var(--color-text-sub); margin-bottom: 32px; }
  .form-field { margin-bottom: 24px; }
  .form-field label { display: block; font-size: 0.9rem; font-weight: 700; margin-bottom: 8px; }
  .form-field label .required { display: inline-block; font-size: 0.65rem; font-weight: 700; color: #fff; background: var(--color-accent-gold); padding: 2px 8px; border-radius: 4px; margin-left: 8px; vertical-align: middle; letter-spacing: 0.05em; }
  .form-field input.field-error,
  .form-field textarea.field-error {
    border-color: #c0392b;
    background: #fdf3f2;
  }
  .field-error-msg {
    display: none;
    color: #c0392b;
    font-size: 0.8rem;
    margin-top: 6px;
  }
  .field-error-msg.show { display: block; }
  .privacy-check.field-error-outline,
  .recaptcha-widget.field-error-outline {
    outline: 1.5px solid #c0392b;
    outline-offset: 4px;
    border-radius: 8px;
  }
  .form-submit-note {
    display: none;
    text-align: center;
    font-size: 0.85rem;
    color: #c0392b;
    margin-bottom: 16px;
  }
  .form-submit-note.show { display: block; }
  .form-success {
    display: none;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 700;
    color: #2f9e78;
    background: #eaf7f1;
    border: 1px solid #2f9e78;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
  }
  .form-success.show { display: block; }
  .form-field label .optional { display: inline-block; font-size: 0.65rem; font-weight: 700; color: var(--color-text-sub); background: #f0eee9; padding: 2px 8px; border-radius: 4px; margin-left: 8px; vertical-align: middle; letter-spacing: 0.05em; }
  .form-field input[type="text"],
  .form-field input[type="tel"],
  .form-field input[type="email"],
  .form-field textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg-base);
    font-family: var(--font-jp);
    font-size: 0.9rem;
    color: var(--color-text-main);
  }
  .form-field input:focus,
  .form-field textarea:focus {
    outline: none;
    border-color: var(--color-accent-gold);
    background: #ffffff;
  }
  .form-field textarea { min-height: 140px; resize: vertical; }
  .form-field input::placeholder, .form-field textarea::placeholder { color: #b3b3b3; }

  .form-radio-group { display: flex; gap: 24px; margin-bottom: 32px; }
  .form-radio-group label { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; cursor: pointer; }
  .form-radio-group input { accent-color: var(--color-accent-gold); width: 16px; height: 16px; }

  .privacy-check { display: flex; align-items: flex-start; gap: 10px; font-size: 0.85rem; color: var(--color-text-sub); margin: 32px 0; }
  .privacy-check input { margin-top: 4px; accent-color: var(--color-accent-gold); }
  .privacy-check a { color: var(--color-accent-gold); text-decoration: underline; }

  /* reCAPTCHA-style bot protection widget */
  .recaptcha-widget {
    margin: 24px 0;
    display: inline-block;
    border-radius: 4px;
  }
  .honeypot-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

  .form-submit-wrap { text-align: center; }
  .btn-primary {
    display: inline-block; background: var(--color-accent-gold); color: #ffffff;
    padding: 16px 56px; border-radius: 50px; font-weight: 700; border: none;
    font-family: var(--font-jp); font-size: 0.95rem; cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;
  }
  .btn-primary:hover { background: var(--color-accent-hover); transform: translateY(-2px); }

  /* FOOTER */
  .site-footer { background: #000000; padding: 56px 0 32px 0; text-align: center; }
  .wave-divider { width: 100%; height: 64px; display: block; margin-bottom: -1px; }
  .wave-divider svg { width: 100%; height: 100%; display: block; }
  .wave-sparkle {
    fill: #ffffff;
    animation: sea-twinkle 3s ease-in-out infinite;
  }
  @media (prefers-reduced-motion: reduce) {
    .wave-sparkle { animation: none; opacity: 0.4; }
  }
  .site-footer img.footer-mark { width: 160px; margin: 0 auto 20px auto; filter: brightness(0) invert(1); opacity: 1; }
  .footer-legal { display: flex; justify-content: center; gap: 20px; margin-bottom: 20px; }
  .footer-legal a { font-size: 0.75rem; text-decoration: none; color: #ffffff; }
  .footer-legal a:hover { color: var(--color-accent-gold); }
  .footer-copyright { font-family: var(--font-en); font-size: 0.75rem; color: #ffffff; letter-spacing: 0.05em; }

  @media (max-width: 900px) {
    .contact-layout { grid-template-columns: 1fr; }
    .form-card { padding: 32px 24px; }
  }
  @media (max-width: 500px) {
    .form-radio-group { flex-direction: column; gap: 12px; }
  }

  /* ===== SCROLL REVEAL ===== */
  .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
  .reveal.is-visible { opacity: 1; transform: translateY(0); }
  .form-card.reveal { transition-delay: 0.1s; }
  @media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  }
  /* ===== YOKOHAMA SKYLINE BACKGROUND ===== */
  .yokohama-skyline {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 32vh;
    min-height: 230px;
    max-height: 340px;
    color: var(--color-accent-gold);
    z-index: -1;
    pointer-events: none;
  }
  .yokohama-skyline svg { width: 100%; height: 100%; display: block; }
  .skyline-silhouette { opacity: 0.2; }
  @media (max-width: 700px) {
    .yokohama-skyline { height: 19vh; }
    .skyline-silhouette { opacity: 0.16; }
  }
  .wheel-rotate {
    animation: wheel-spin 45s linear infinite;
  }
  @keyframes wheel-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
  }
  .wheel-light {
    fill: #ffcf6b;
    filter: drop-shadow(0 0 6px #ffcf6b) drop-shadow(0 0 12px rgba(255,207,107,0.6));
    animation: wheel-glow 2.4s ease-in-out infinite;
  }
  @keyframes wheel-glow {
    0%, 100% { opacity: 0.25; }
    50% { opacity: 1; }
  }
  @media (prefers-reduced-motion: reduce) {
    .wheel-rotate { animation: none; }
    .wheel-light { animation: none; opacity: 0.7; }
  }
  .sea-sparkle {
    fill: #ffffff;
    animation: sea-twinkle 3s ease-in-out infinite;
  }
  @keyframes sea-twinkle {
    0%, 100% { opacity: 0.15; }
    50% { opacity: 0.9; }
  }
  @media (prefers-reduced-motion: reduce) {
    .sea-sparkle { animation: none; opacity: 0.4; }
  }

  /* ===== YOKOHAMA AIR CABIN STRIP (over skyline) ===== */
  .cablecar-strip {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 7vh;
    width: 100vw;
    height: 40px;
    z-index: -1;
    overflow: visible;
    pointer-events: none;
  }
  .cablecar-line {
    position: absolute;
    top: 14px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent-gold);
    opacity: 0.45;
  }
  .cablecar-gondola {
    position: absolute;
    top: 14px;
    left: -60px;
    width: 40px;
    height: 30px;
    animation: cablecar-move 22s linear infinite;
  }
  .cablecar-gondola svg { width: 100%; height: 100%; display: block; }
  .cablecar-gondola .cabin-sway {
    animation: cablecar-sway 2.2s ease-in-out infinite;
    transform-origin: 20px 8px;
  }
  @keyframes cablecar-sway {
    0%, 100% { transform: rotate(-3deg); }
    50% { transform: rotate(3deg); }
  }
  .cablecar-gondola:nth-child(2) { animation-delay: -4s; }
  .cablecar-gondola:nth-child(3) { animation-delay: -8s; }
  .cablecar-gondola:nth-child(4) { animation-delay: -12s; }
  @keyframes cablecar-move {
    from { left: -60px; }
    to { left: 100%; }
  }
  @media (prefers-reduced-motion: reduce) {
    .cablecar-gondola { animation: none; left: 20%; }
    .cablecar-gondola .cabin-sway { animation: none; }
  }

  /* ===== GRAIN TEXTURE OVERLAY ===== */
  .grain-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 999;
    opacity: 0.045;
    mix-blend-mode: multiply;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 180px 180px;
  }