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

  :root {
    --green: #1e5c45;
    --green-light: #2d7a5e;
    --green-btn: #1e5c45;
    --text: #2c2c2c;
    --text-muted: #666;
    --bg: #f7f9f8;
    --white: #ffffff;
  }

  html { scroll-behavior: smooth; }

  body {
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
  }

  /* ─── HEADER ─── */
  header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    height: 80px;
    display: flex;
    align-items: center;
    padding: 0 40px;
  }

  .header-inner {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0;
  }

  .header-link {
    font-size: 20px; /* ここで文字の大きさを指定 */
  }

  .logo { 
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
  }
  .logo img { height: 72px; }

  nav {
    display: flex;
    align-items: center;
    gap: 36px;
    margin: 0 auto;
  }

  nav a {
    text-decoration: none;
    color: var(--text);
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.02em;
    transition: color 0.2s;
  }
  nav a:hover { color: var(--green); }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
  }

  .btn-primary {
    background: var(--green-btn);
    color: #fff;
    border: none;
    border-radius: 100px;
    padding: 10px 22px;
    font-size: 14px;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: background 0.2s, transform 0.15s;
    letter-spacing: 0.02em;
  }
  .btn-primary:hover { background: var(--green-light); transform: translateY(-1px); }

  .btn-outline {
    background: transparent;
    color: var(--text);
    border: 1.5px solid #ccc;
    border-radius: 100px;
    padding: 9px 20px;
    font-size: 14px;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 400;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: border-color 0.2s, color 0.2s;
    letter-spacing: 0.02em;
  }
  .btn-outline:hover { border-color: var(--green); color: var(--green); }

  /* ─── HERO ─── */
  .hero {
    min-height: 100vh;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(160deg, #edf4f1 0%, #e8f3f8 40%, #f0f7f4 70%, #f7f9f8 100%);
    display: flex;
    align-items: center;
  }

  /* Background orbs */
  .hero-bg-orb {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
  }
  .orb-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(180,220,200,0.35) 0%, transparent 70%);
    top: -100px; left: -100px;
  }
  .orb-2 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(180,210,240,0.3) 0%, transparent 70%);
    top: 100px; right: 200px;
  }
  .orb-3 {
    width: 300px; height: 300px;
    background: radial-gradient(circle, rgba(255,220,160,0.2) 0%, transparent 70%);
    bottom: 80px; right: 50px;
  }

  .hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: 80px 40px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 40px;
    position: relative;
    z-index: 2;
  }

  .hero-text { }

  .hero-text h1 {
    font-size: clamp(40px, 5vw, 60px);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text);
    margin-bottom: 20px;
    letter-spacing: -0.01em;
  }

  .hero-text h1 em {
    color: var(--green);
    font-style: normal;
  }

  .hero-subtitle {
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 36px;
    line-height: 1.8;
  }

  .hero-cta {
    display: flex;
    gap: 14px;
    align-items: center;
    flex-wrap: wrap;
  }

  .btn-primary-lg {
    background: var(--green-btn);
    color: #fff;
    border: none;
    border-radius: 100px;
    padding: 14px 32px;
    font-size: 15px;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
    letter-spacing: 0.04em;
    box-shadow: 0 4px 16px rgba(30,92,69,0.25);
  }
  .btn-primary-lg:hover { background: var(--green-light); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(30,92,69,0.3); }

  .btn-outline-lg {
    background: transparent;
    color: var(--text);
    border: 1.5px solid #b0b8b4;
    border-radius: 100px;
    padding: 13px 28px;
    font-size: 15px;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 400;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: border-color 0.2s, color 0.2s;
    letter-spacing: 0.04em;
  }
  .btn-outline-lg:hover { border-color: var(--green); color: var(--green); }

  .hero-note {
    margin-top: 16px;
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .hero-note svg { flex-shrink: 0; }

  /* Hero right visual */
  .hero-visual {
    position: relative;
    height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .hero-phone-wrap {
    position: absolute;
    left: -10px;
    bottom: 30px;
    width: 170px;
    z-index: 4;
    border-radius: 28px;
    overflow: hidden;
    box-shadow:
      0 16px 48px rgba(100,160,130,0.22),
      0 4px 16px rgba(0,0,0,0.1);
  }
  .hero-phone-wrap::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 28px;
    background: linear-gradient(
      135deg,
      rgba(255,255,255,0.12) 0%,
      transparent 50%,
      rgba(200,230,215,0.08) 100%
    );
    pointer-events: none;
  }
  .hero-phone {
    width: 100%;
    display: block;
    border-radius: 28px;
    filter: saturate(0.95) brightness(1.03);
  }

  /* Browser window frame */
  .hero-browser {
    position: absolute;
    right: -30px;
    top: 0px;
    width: 440px;
    z-index: 3;
    border-radius: 14px;
    overflow: hidden;
    box-shadow:
      0 24px 56px rgba(0,0,0,0.2),
      0 6px 16px rgba(0,0,0,0.1),
      0 0 0 1px rgba(0,0,0,0.06);
    background: #fff;
    transform: perspective(1400px) rotateY(-5deg) rotateX(3deg);
    transform-origin: right center;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
  }
  .hero-browser:hover {
    transform: perspective(1400px) rotateY(-2deg) rotateX(1deg) translateY(-4px);
    box-shadow:
      0 36px 72px rgba(0,0,0,0.24),
      0 8px 24px rgba(0,0,0,0.1),
      0 0 0 1px rgba(0,0,0,0.06);
  }

  .hero-browser-bar {
    background: #f0f0f0;
    padding: 9px 14px;
    display: flex;
    align-items: center;
    gap: 6px;
    border-bottom: 1px solid #ddd;
  }

  .hero-browser-dot {
    width: 11px; height: 11px;
    border-radius: 50%;
    flex-shrink: 0;
  }

  .hero-browser-url {
    flex: 1;
    background: #fff;
    border-radius: 20px;
    padding: 4px 12px;
    font-size: 10px;
    color: #888;
    margin-left: 8px;
    font-family: monospace;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    border: 1px solid #e8e8e8;
  }

  .hero-browser img {
    width: 100%;
    display: block;
  }

  /* Polaroid-style photo card */
  .hero-polaroid {
    position: absolute;
    bottom: 40px;
    right: 30px;
    width: 160px;
    background: #fff;
    padding: 8px 8px 28px;
    border-radius: 4px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.18), 0 2px 8px rgba(0,0,0,0.1);
    transform: rotate(4deg);
    z-index: 5;
    transition: transform 0.3s ease;
  }
  .hero-polaroid:hover { transform: rotate(2deg) translateY(-4px); }

  .hero-polaroid img {
    width: 100%;
    height: 100px;
    object-fit: cover;
    border-radius: 2px;
    display: block;
  }

  .hero-polaroid-label {
    font-size: 10px;
    color: #999;
    text-align: center;
    margin-top: 6px;
    font-family: 'Noto Sans JP', sans-serif;
  }

  .hero-deco-plane {
    position: absolute;
    top: -10px;
    right: 20px;
    width: 68px;
    opacity: 0.85;
    z-index: 6;
  }

  .hero-deco-memories {
    position: absolute;
    bottom: 200px;
    right: 420px;
    width: 100px;
    opacity: 0.85;
    z-index: 6;
  }

  .hero-deco-leaf-l {
    position: absolute;
    bottom: 0px;
    left: 150px;
    width: 90px;
    opacity: 0.65;
    z-index: 1;
  }

  .hero-deco-blob {
    position: absolute;
    bottom: -30px;
    right: 200px;
    width: 160px;
    opacity: 0.45;
    z-index: 1;
    pointer-events: none;
  }

  /* ─── FEATURES ─── */
  .features {
    background: var(--white);
    padding: 80px 40px;
  }

  .section-header {
    text-align: center;
    margin-bottom: 56px;
  }

  .section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--green);
    font-weight: 500;
    margin-bottom: 12px;
    letter-spacing: 0.04em;
  }

  .section-title {
    font-size: clamp(22px, 3vw, 30px);
    font-weight: 700;
    letter-spacing: 0.02em;
  }

  .features-inner {
    max-width: 1000px;
    margin: 0 auto;
  }

  .features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }

  .feature-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px 24px;
    border-radius: 20px;
    background: #f8faf9;
    transition: transform 0.2s, box-shadow 0.2s;
  }
  .feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.07);
  }

  .feature-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
    object-fit: contain;
  }

  .feature-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--green);
    margin-bottom: 10px;
  }

  .feature-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.8;
  }

  /* ─── HOW-TO ─── */
  .howto {
    background: linear-gradient(180deg, #f0f7f3 0%, #eaf3f8 100%);
    padding: 80px 40px;
    position: relative;
    overflow: hidden;
  }

  .howto-bg-leaf-l {
    position: absolute;
    left: -40px;
    top: 60px;
    width: 160px;
    opacity: 0.6;
    pointer-events: none;
  }

  .howto-bg-leaf-r {
    position: absolute;
    right: -30px;
    bottom: 100px;
    width: 140px;
    opacity: 0.5;
    transform: scaleX(-1);
    pointer-events: none;
  }

  .howto-bg-dot {
    position: absolute;
    right: 60px;
    top: 40px;
    width: 120px;
    opacity: 0.3;
    pointer-events: none;
  }

  .howto-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 220px 1fr 300px;
    gap: 48px;
    align-items: center;
    position: relative;
    z-index: 2;
  }

  .howto-phone {
    width: 100%;
    display: block;
    border-radius: 28px;
    box-shadow:
      0 16px 48px rgba(100,160,130,0.2),
      0 4px 16px rgba(0,0,0,0.08);
    filter: saturate(0.95) brightness(1.02);
  }

  .howto-text { }

  .howto-label {
    font-size: 13px;
    color: var(--green);
    font-weight: 500;
    margin-bottom: 10px;
    letter-spacing: 0.04em;
  }

  .howto-heading {
    font-size: clamp(26px, 3.5vw, 38px);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
  }

  .howto-sub {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 28px;
    line-height: 1.8;
  }

  .howto-steps {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .howto-steps li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
  }

  .step-check {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--green);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  .step-check svg { display: block; }

  /* CTA Card */
  .howto-cta-card {
    background: var(--white);
    border-radius: 24px;
    padding: 36px 28px;
    box-shadow: 0 8px 40px rgba(0,0,0,0.08);
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .howto-cta-card .cta-leaf {
    position: absolute;
    bottom: -10px;
    right: -10px;
    width: 100px;
    opacity: 0.6;
    pointer-events: none;
  }

  .howto-cta-title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.5;
  }

  .howto-cta-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 24px;
    line-height: 1.8;
  }

  /* ─── PRIVACY ─── */
  .privacy {
    background: var(--white);
    padding: 70px 40px;
    position: relative;
    overflow: hidden;
  }

  .privacy-inner {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 40px;
    position: relative;
    z-index: 2;
  }

  .privacy-icon-wrap {
    flex-shrink: 0;
    width: 100px;
    position: relative;
  }

  .privacy-icon-wrap img {
    width: 100%;
  }

  .privacy-bg-blob {
    position: absolute;
    width: 300px;
    right: -50px;
    top: -60px;
    opacity: 0.3;
    pointer-events: none;
  }

  .privacy-text h3 {
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.5;
  }
  .privacy-text p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.8;
  }

  /* ─── FOOTER ─── */
  footer {
    background: var(--green);
    color: rgba(255,255,255,0.85);
    padding: 40px;
    text-align: center;
  }

  .footer-inner {
    max-width: 1200px;
    margin: 0 auto;
  }

  .footer-logo-text {
    font-size: 20px;
    font-weight: 700;
    color: rgba(255,255,255,0.9);
    margin-bottom: 20px;
    letter-spacing: 0.02em;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 24px;
    flex-wrap: wrap;
  }

  .footer-links a {
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
  }
  .footer-links a:hover { color: #fff; }

  .footer-copy {
    font-size: 12px;
    color: rgba(255,255,255,0.5);
  }

  /* Scroll-in animations */
  .fade-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .fade-up.in-view {
    opacity: 1;
    transform: none;
  }
  .fade-up:nth-child(2) { transition-delay: 0.1s; }
  .fade-up:nth-child(3) { transition-delay: 0.2s; }

  /* ─── HAMBURGER ─── */
  .hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    flex-shrink: 0;
  }

  .hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform-origin: center;
  }

  .hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
  .hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .mobile-nav-cta { display: none; }

  /* ─── HOWTO DECORATIVE GRID ─── */
  .howto-deco-grid {
    max-width: 1100px;
    margin: 60px auto 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: center;
    position: relative;
    z-index: 2;
  }

  .howto-deco-left {
    display: flex;
    gap: 24px;
    align-items: flex-end;
  }

  .howto-deco-right {
    display: flex;
    justify-content: center;
  }

  .howto-deco-img-sm { width: 140px; filter: drop-shadow(0 8px 20px rgba(0,0,0,0.1)); }
  .howto-deco-img-md { width: 160px; border-radius: 12px; filter: drop-shadow(0 8px 20px rgba(0,0,0,0.1)); }
  .howto-deco-img-lg { width: 180px; filter: drop-shadow(0 8px 20px rgba(0,0,0,0.1)); }

  /* ─── RESPONSIVE: TABLET (≤ 900px) ─── */
  @media (max-width: 900px) {
    .hero-inner {
      gap: 24px;
      padding: 60px 32px;
    }

    .hero-browser {
      width: 340px;
      right: -10px;
    }

    .howto-inner {
      grid-template-columns: 180px 1fr;
      grid-template-rows: auto auto;
    }

    .howto-cta-card {
      grid-column: 1 / -1;
    }
  }

  /* ─── RESPONSIVE: MOBILE (≤ 768px) ─── */
  @media (max-width: 768px) {
    /* Header */
    header {
      height: 60px;
      padding: 0 16px;
    }

    .logo img { height: 44px; }

    .hamburger { display: flex; }

    .header-actions {
      margin-left: auto;
    }

    .header-actions .btn-outline { display: none; }

    .btn-primary {
      padding: 8px 16px;
      font-size: 13px;
    }

    /* Mobile nav dropdown */
    nav#nav-menu {
      position: fixed;
      top: 60px;
      left: 0;
      right: 0;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      flex-direction: column;
      padding: 0;
      gap: 0;
      margin: 0;
      border-bottom: 1px solid rgba(0,0,0,0.08);
      box-shadow: 0 8px 24px rgba(0,0,0,0.1);
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      z-index: 99;
      display: flex;
    }

    nav#nav-menu.open {
      max-height: 400px;
    }

    nav#nav-menu .header-link {
      display: block;
      padding: 16px 24px;
      font-size: 15px;
      font-weight: 400;
      border-bottom: 1px solid rgba(0,0,0,0.05);
      letter-spacing: 0.02em;
      color: var(--text);
    }

    nav#nav-menu .header-link:hover {
      background: rgba(30,92,69,0.04);
      color: var(--green);
    }

    .mobile-nav-cta {
      display: block;
      padding: 16px 24px 20px;
    }

    .mobile-nav-cta .btn-outline {
      display: inline-flex;
      width: 100%;
      justify-content: center;
      padding: 12px 20px;
      font-size: 14px;
      border-radius: 100px;
    }

    /* Hero */
    .hero { padding-top: 60px; }

    .hero-inner {
      grid-template-columns: 1fr;
      padding: 36px 20px 48px;
      gap: 32px;
      text-align: center;
    }

    .hero-text h1 { font-size: clamp(30px, 8vw, 40px); }

    .hero-subtitle { font-size: 14px; }

    .hero-cta {
      flex-direction: column;
      align-items: stretch;
    }

    .btn-primary-lg,
    .btn-outline-lg {
      width: 100%;
      justify-content: center;
    }

    .hero-note { justify-content: center; }

    /* Hero visual: phone + polaroid only */
    .hero-visual { height: 340px; }

    .hero-browser,
    .hero-deco-plane,
    .hero-deco-memories,
    .hero-deco-blob,
    .hero-deco-leaf-l { display: none; }

    .hero-phone-wrap {
      left: 50%;
      transform: translateX(-50%);
      bottom: 0;
      width: 180px;
    }

    .hero-polaroid {
      right: 16px;
      bottom: 20px;
      top: auto;
      width: 110px;
    }

    /* Features */
    .features { padding: 56px 20px; }

    .section-header { margin-bottom: 32px; }

    .features-grid {
      grid-template-columns: 1fr;
      max-width: 400px;
      margin: 0 auto;
      gap: 16px;
    }

    /* How-to */
    .howto { padding: 56px 20px; }

    .howto-bg-leaf-l,
    .howto-bg-leaf-r,
    .howto-bg-dot { display: none; }

    .howto-inner {
      grid-template-columns: 1fr;
      gap: 28px;
    }

    .howto-phone {
      width: 200px;
      margin: 0 auto;
    }

    .howto-text { text-align: center; }

    .howto-steps {
      text-align: left;
      max-width: 260px;
      margin: 0 auto;
    }

    .howto-deco-grid {
      grid-template-columns: 1fr;
      margin-top: 40px;
      gap: 20px;
    }

    .howto-deco-left { justify-content: center; }
    .howto-deco-img-sm { width: 100px; }
    .howto-deco-img-md { width: 120px; }
    .howto-deco-img-lg { width: 140px; }

    /* Privacy */
    .privacy { padding: 56px 20px; }

    .privacy-inner {
      flex-direction: column;
      text-align: center;
      gap: 20px;
    }

    .privacy-text h3 { font-size: 17px; }

    /* Footer */
    footer { padding: 36px 20px; }

    .footer-links {
      flex-direction: column;
      gap: 12px;
    }

    .footer-links a { font-size: 13px; }
  }

  /* ─── RESPONSIVE: SMALL PHONE (≤ 480px) ─── */
  @media (max-width: 480px) {
    .hero-text h1 { font-size: 28px; }

    .hero-visual { height: 290px; }

    .hero-phone-wrap { width: 150px; }

    .hero-polaroid {
      width: 90px;
      right: 10px;
      bottom: 14px;
    }

    .howto-phone { width: 170px; }

    .feature-card { padding: 24px 16px; }
  }