/* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --color-bg: #FAF9F7;
      --color-bg-alt: #F3F1ED;
      --color-surface: #FFFFFF;
      --color-border: #E8E4DC;
      --color-text-primary: #1C1917;
      --color-text-secondary: #6B6560;
      --color-text-muted: #A09B95;
      --color-accent: #D97B4F;
      --color-accent-light: #F5E6DC;
      --color-accent-hover: #C4683D;
      --font-sans: 'Inter', 'Noto Sans JP', 'Hiragino Sans', sans-serif;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 16px rgba(0,0,0,0.07), 0 2px 6px rgba(0,0,0,0.04);
      --shadow-lg: 0 12px 40px rgba(0,0,0,0.09), 0 4px 12px rgba(0,0,0,0.05);
      --max-w: 960px;
      --section-gap: 120px;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    /* ===== Layout ===== */
    .container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
    .section { padding: var(--section-gap) 0; }

    /* ===== Navigation ===== */
    .nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      height: 60px; display: flex; align-items: center;
      background: rgba(250,249,247,0.88);
      backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent; transition: border-color 0.2s;
    }
    .nav.scrolled { border-bottom-color: var(--color-border); }
    .nav__inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; width: 100%; display: flex; align-items: center; justify-content: space-between; }
    .nav__logo { font-size: 16px; font-weight: 700; letter-spacing: 0.12em; color: var(--color-text-primary); text-decoration: none; }
    .nav__links { display: flex; gap: 32px; list-style: none; }
    .nav__links a { font-size: 13px; color: var(--color-text-secondary); text-decoration: none; transition: color 0.15s; }
    .nav__links a:hover { color: var(--color-text-primary); }
    .nav__cta { font-size: 13px; font-weight: 600; color: var(--color-accent) !important; }

    /* ===== Buttons ===== */
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 6px;
      padding: 12px 24px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600;
      cursor: pointer; text-decoration: none; transition: all 0.15s ease; border: none; outline: none;
    }
    .btn-primary { background: var(--color-text-primary); color: #fff; }
    .btn-primary:hover { background: #2E2926; transform: translateY(-1px); box-shadow: var(--shadow-md); }
    .btn-secondary { background: transparent; color: var(--color-text-secondary); border: 1.5px solid var(--color-border); }
    .btn-secondary:hover { border-color: var(--color-text-secondary); color: var(--color-text-primary); }
    .btn-accent { background: var(--color-accent); color: #fff; }
    .btn-accent:hover { background: var(--color-accent-hover); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(217,123,79,0.3); }

    /* ===== Tags & Badges ===== */
    .tag { font-size: 11px; font-weight: 500; padding: 3px 9px; border-radius: 100px; background: var(--color-bg-alt); color: var(--color-text-muted); }
    .badge { font-size: 11px; font-weight: 600; letter-spacing: 0.06em; padding: 4px 10px; border-radius: 100px; background: var(--color-bg-alt); color: var(--color-text-secondary); }
    .badge--new { background: var(--color-accent-light); color: var(--color-accent); }

    /* ===== Section Header ===== */
    .section-header { margin-bottom: 56px; }
    .section-header__label { font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-accent); margin-bottom: 12px; }
    .section-header__title { font-size: clamp(26px,4vw,36px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 14px; }
    .section-header__desc { font-size: 15px; color: var(--color-text-secondary); max-width: 480px; line-height: 1.7; }

    /* ===== Divider ===== */
    .divider { height: 1px; background: var(--color-border); }

    /* ===== Hero ===== */
    .hero { padding-top: 160px; padding-bottom: 100px; text-align: center; }
    .hero__eyebrow {
      display: inline-flex; align-items: center; gap: 6px;
      font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
      color: var(--color-accent); background: var(--color-accent-light);
      padding: 5px 12px; border-radius: 100px; margin-bottom: 28px;
    }
    .hero__eyebrow::before { content: ''; width: 6px; height: 6px; background: var(--color-accent); border-radius: 50%; }
    .hero__title { font-size: clamp(42px,8vw,72px); font-weight: 800; letter-spacing: -0.03em; line-height: 1.05; margin-bottom: 24px; }
    .hero__subtitle { font-size: clamp(16px,2.5vw,20px); color: var(--color-text-secondary); max-width: 540px; margin: 0 auto 16px; line-height: 1.7; }
    .hero__concept { font-size: 13px; color: var(--color-text-muted); max-width: 480px; margin: 0 auto 44px; }
    .hero__actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

    /* ===== About ===== */
    .about { background: var(--color-bg-alt); }
    .about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
    .about__features { display: flex; flex-direction: column; gap: 28px; }
    .feature-item { display: flex; gap: 16px; align-items: flex-start; }
    .feature-item__icon { width: 40px; height: 40px; background: var(--color-accent-light); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: 18px; }
    .feature-item__text h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
    .feature-item__text p { font-size: 13px; color: var(--color-text-secondary); line-height: 1.6; }

    /* ===== App Cards ===== */
    .apps__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
    .app-card {
      background: var(--color-surface); border: 1px solid var(--color-border);
      border-radius: var(--radius-lg); padding: 28px;
      display: flex; flex-direction: column; gap: 16px;
      transition: box-shadow 0.2s, transform 0.2s; cursor: default;
    }
    .app-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
    .app-card__header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
    .app-card__icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 24px; flex-shrink: 0; }
    .app-card__name { font-size: 17px; font-weight: 700; }
    .app-card__desc { font-size: 13px; color: var(--color-text-secondary); line-height: 1.65; flex: 1; }
    .app-card__tags { display: flex; flex-wrap: wrap; gap: 6px; }
    .app-card__link { font-size: 13px; font-weight: 600; color: var(--color-accent); text-decoration: none; display: inline-flex; align-items: center; gap: 4px; margin-top: 4px; transition: gap 0.15s; }
    .app-card__link:hover { gap: 8px; }

    /* ===== Contact ===== */
    .contact { background: var(--color-bg-alt); }
    .contact__inner { max-width: 600px; }
    .form { display: flex; flex-direction: column; gap: 20px; margin-top: 40px; }
    .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .form-group { display: flex; flex-direction: column; gap: 6px; }
    .form-group label { font-size: 13px; font-weight: 600; }
    .form-group .required { color: var(--color-accent); margin-left: 3px; }
    .form-control {
      width: 100%; padding: 12px 14px; font-size: 14px; font-family: var(--font-sans);
      color: var(--color-text-primary); background: var(--color-surface);
      border: 1.5px solid var(--color-border); border-radius: var(--radius-sm);
      outline: none; transition: border-color 0.15s, box-shadow 0.15s; appearance: none; -webkit-appearance: none;
    }
    .form-control::placeholder { color: var(--color-text-muted); }
    .form-control:focus { border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(217,123,79,0.12); }
    textarea.form-control { min-height: 140px; resize: vertical; }
    .form-submit { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
    .form-notice { font-size: 12px; color: var(--color-text-muted); }

    /* ===== Footer ===== */
    .footer { padding: 48px 0; border-top: 1px solid var(--color-border); }
    .footer__inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
    .footer__logo { font-size: 14px; font-weight: 700; letter-spacing: 0.1em; color: var(--color-text-primary); }
    .footer__links { display: flex; gap: 20px; }
    .footer__links a { font-size: 12px; color: var(--color-text-muted); text-decoration: none; transition: color 0.15s; }
    .footer__links a:hover { color: var(--color-text-secondary); }
    .footer__copy { font-size: 12px; color: var(--color-text-muted); }

    /* ===== Fade-up Animation ===== */
    .fade-up { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
    .fade-up.visible { opacity: 1; transform: translateY(0); }

    /* ===== Detail Page Layout ===== */
    .detail-page { display: none; min-height: 100vh; }
    .detail-page.active { display: block; }

    .breadcrumb {
      padding: 80px 0 0;
    }
    .breadcrumb__inner { display: flex; align-items: center; gap: 8px; }
    .breadcrumb__back {
      display: inline-flex; align-items: center; gap: 6px;
      font-size: 13px; font-weight: 500; color: var(--color-text-secondary);
      text-decoration: none; transition: color 0.15s;
    }
    .breadcrumb__back:hover { color: var(--color-accent); }
    .breadcrumb__sep { font-size: 12px; color: var(--color-text-muted); }
    .breadcrumb__current { font-size: 13px; color: var(--color-text-muted); }

    /* ===== App Detail Hero ===== */
    .app-hero { padding: 40px 0 80px; }
    .app-hero__inner { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; }
    .app-hero__icon-wrap {
      width: 80px; height: 80px; border-radius: 22px;
      display: flex; align-items: center; justify-content: center;
      font-size: 38px; margin-bottom: 24px; box-shadow: var(--shadow-md);
    }
    .app-hero__meta { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
    .app-hero__name { font-size: clamp(30px,5vw,48px); font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 20px; }
    .app-hero__desc { font-size: 17px; color: var(--color-text-secondary); line-height: 1.7; margin-bottom: 28px; }
    .app-hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }

    .app-hero__visual {
      background: var(--color-bg-alt); border: 1px solid var(--color-border);
      border-radius: var(--radius-lg); aspect-ratio: 4/3;
      display: flex; flex-direction: column; align-items: center; justify-content: center;
      gap: 10px; color: var(--color-text-muted); font-size: 13px;
    }
    .app-hero__visual-icon { font-size: 40px; opacity: 0.4; }

    /* ===== App Detail Features ===== */
    .app-features { background: var(--color-bg-alt); }
    .app-features__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .app-feature-card {
      background: var(--color-surface); border: 1px solid var(--color-border);
      border-radius: var(--radius-md); padding: 24px;
    }
    .app-feature-card__icon { font-size: 24px; margin-bottom: 12px; }
    .app-feature-card__title { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
    .app-feature-card__desc { font-size: 13px; color: var(--color-text-secondary); line-height: 1.6; }

    /* ===== App Detail CTA ===== */
    .app-cta { text-align: center; }
    .app-cta__title { font-size: clamp(22px,3.5vw,32px); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 14px; }
    .app-cta__desc { font-size: 15px; color: var(--color-text-secondary); margin-bottom: 32px; }
    .app-cta__privacy { margin-top: 20px; font-size: 12px; color: var(--color-text-muted); }
    .app-cta__privacy a { color: var(--color-text-muted); text-decoration: underline; text-underline-offset: 3px; transition: color 0.15s; }
    .app-cta__privacy a:hover { color: var(--color-text-secondary); }

    /* ===== Privacy Policy ===== */
    .privacy-hero { padding: 100px 0 60px; }
    .privacy-hero__title { font-size: clamp(28px,5vw,44px); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
    .privacy-hero__date { font-size: 13px; color: var(--color-text-muted); }

    .privacy-body { padding-bottom: 100px; }
    .privacy-body__inner { max-width: 720px; }
    .privacy-section { margin-bottom: 48px; }
    .privacy-section h2 { font-size: 18px; font-weight: 700; margin-bottom: 14px; padding-bottom: 10px; border-bottom: 1px solid var(--color-border); }
    .privacy-section p, .privacy-section li { font-size: 14px; color: var(--color-text-secondary); line-height: 1.8; }
    .privacy-section ul { padding-left: 20px; display: flex; flex-direction: column; gap: 6px; }
    .privacy-section p + p { margin-top: 10px; }

    /* ===== Carousel ===== */
    .carousel {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: var(--color-bg-alt);
      border: 1px solid var(--color-border);
      aspect-ratio: 9 / 16;
      max-width: 260px;
      margin: 0 auto;
      user-select: none;
      -webkit-user-select: none;
      touch-action: pan-y;
    }
    .carousel__track {
      display: flex;
      height: 100%;
      transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    .carousel__track.dragging { transition: none; }
    .carousel__slide {
      min-width: 100%;
      height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 10px;
      background: var(--color-bg-alt);
      color: var(--color-text-muted);
      font-size: 13px;
      flex-shrink: 0;
    }
    .carousel__slide img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      pointer-events: none;
    }
    .carousel__slide-placeholder-icon { font-size: 36px; opacity: 0.3; }
    .carousel__dots {
      position: absolute;
      bottom: 12px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 6px;
      z-index: 2;
    }
    .carousel__dot {
      width: 7px; height: 7px;
      border-radius: 50%;
      background: rgba(0,0,0,0.25);
      border: none;
      cursor: pointer;
      padding: 0;
      transition: background 0.2s, transform 0.2s;
    }
    .carousel__dot.active {
      background: var(--color-accent);
      transform: scale(1.3);
    }
    .carousel__btn {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 28px; height: 28px;
      border-radius: 50%;
      background: rgba(255,255,255,0.85);
      border: 1px solid var(--color-border);
      cursor: pointer;
      display: flex; align-items: center; justify-content: center;
      font-size: 12px;
      z-index: 2;
      transition: background 0.15s;
      box-shadow: var(--shadow-sm);
    }
    .carousel__btn:hover { background: #fff; }
    .carousel__btn--prev { left: 8px; }
    .carousel__btn--next { right: 8px; }

    /* ===== Google Play Badge ===== */
    .btn-gplay {
      display: inline-flex; align-items: center; gap: 10px;
      padding: 10px 20px; border-radius: var(--radius-sm);
      background: #000; color: #fff; text-decoration: none;
      font-family: var(--font-sans); transition: all 0.15s; border: none; cursor: pointer;
    }
    .btn-gplay:hover { background: #222; transform: translateY(-1px); box-shadow: var(--shadow-md); }
    .btn-gplay__icon { font-size: 22px; line-height: 1; }
    .btn-gplay__text { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.2; }
    .btn-gplay__label { font-size: 10px; font-weight: 400; letter-spacing: 0.02em; }
    .btn-gplay__store { font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }

    /* ===== Responsive ===== */
    @media (max-width: 768px) {
      :root { --section-gap: 80px; }
      .nav__links { display: none; }
      .hero { padding-top: 120px; padding-bottom: 64px; }
      .about__grid { grid-template-columns: 1fr; gap: 40px; }
      .apps__grid { grid-template-columns: 1fr; }
      .form-row { grid-template-columns: 1fr; }
      .footer__inner { flex-direction: column; align-items: flex-start; }
      .app-hero__inner { grid-template-columns: 1fr; gap: 40px; }
      .app-features__grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 480px) {
      .hero__actions, .app-hero__actions { flex-direction: column; align-items: center; }
      .btn { width: 100%; max-width: 280px; }
    }

    /* ===== Mobile Menu (hamburger) ===== */
    .nav__toggle {
      display: none;
      flex-direction: column; justify-content: center; align-items: center; gap: 5px;
      width: 44px; height: 44px;
      background: transparent; border: none; cursor: pointer; padding: 0;
    }
    .nav__toggle span {
      display: block; width: 22px; height: 2px;
      background: var(--color-text-primary); border-radius: 2px;
      transition: transform 0.2s ease, opacity 0.2s ease;
    }
    .nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav__toggle.open span:nth-child(2) { opacity: 0; }
    .nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    @media (max-width: 768px) {
      .nav__toggle { display: flex; }
      .nav__links {
        display: none;
        position: fixed; top: 60px; left: 0; right: 0;
        flex-direction: column; gap: 0;
        background: rgba(250,249,247,0.97);
        backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        padding: 8px 24px 12px;
      }
      .nav__links.open { display: flex; }
      .nav__links li { border-top: 1px solid var(--color-border); }
      .nav__links li:first-child { border-top: none; }
      .nav__links a { display: block; padding: 14px 0; font-size: 14px; }
    }

    /* ===== Contact form extras ===== */
    /* スパムボット対策の罠フィールド：画面外に隠す（display:noneだとボットが無視するため） */
    .hp-field {
      position: absolute !important;
      left: -9999px !important; top: -9999px !important;
      width: 1px; height: 1px; overflow: hidden;
    }
    .form-error {
      font-size: 13px; font-weight: 600; color: #C0392B;
      background: #FDECEA; border: 1px solid #F5C6C0;
      border-radius: var(--radius-sm); padding: 10px 14px;
    }
    #turnstile-holder { min-height: 0; }