:root {
      --indigo: #16243b;
      --indigo-light: #263b5a;
      --vermilion: #b9472f;
      --vermilion-dark: #963622;
      --paper: #f5f0e5;
      --paper-light: #fffdf8;
      --paper-deep: #e9dfca;
      --gold: #b99a4b;
      --gold-light: #d8bd72;
      --ink: #24211d;
      --muted: #6c675f;
      --white: #ffffff;
      --shadow: 0 14px 40px rgba(20, 27, 39, 0.12);
      --radius: 18px;
      --max: 1120px;
      --text: #162437;
      --color-shyu: #dc4434;         /* 朱色 */
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      color: var(--ink);
      background:
        radial-gradient(circle at 15% 20%, rgba(185,154,75,0.07), transparent 26%),
        radial-gradient(circle at 85% 75%, rgba(22,36,59,0.06), transparent 30%),
        var(--paper);
      font-family:
        "Hiragino Mincho ProN",
        "Yu Mincho",
        "YuMincho",
        "Noto Serif JP",
        serif;
      line-height: 1.9;
      letter-spacing: 0.03em;
    }

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

    a {
      color: inherit;
    }

    .container {
      width: min(calc(100% - 40px), var(--max));
      margin: 0 auto;
    }

    .narrow {
      width: min(calc(100% - 40px), 860px);
      margin: 0 auto;
    }

    .section {
      padding: 96px 0;
    }

    .section-small {
      padding: 64px 0;
    }

    .voice-section {
      position: relative;
      overflow: hidden;
      background: var(--paper-light);
    }

    .voice-section::before {
      content: "";
      position: absolute;
      inset: 0;
      background:
        linear-gradient(90deg, rgba(255,253,248,0.94) 0%, rgba(255,253,248,0.82) 44%, rgba(255,253,248,0.68) 100%),
        url("../img/google-form-feedback-voice-bg.jpg") center / cover no-repeat;
      opacity: 0.50;
    }

    .voice-section .narrow {
      position: relative;
      z-index: 1;
    }

    .eyebrow {
      display: inline-block;
      margin-bottom: 14px;
      color: var(--color-shyu);
      font-size: 0.88rem;
      font-weight: 700;
      letter-spacing: 0.18em;
      /* 文字と同じ色で細いフチ取りをつけて太く見せる */
      -webkit-text-stroke: 0.5px currentColor;
    }

    h1,
    h2,
    h3,
    p {
      margin-top: 0;
    }

    h1 {
      margin-bottom: 24px;
      font-size: clamp(2.3rem, 6vw, 5rem);
      line-height: 1.2;
      letter-spacing: 0.03em;
    }

    h2 {
      margin-bottom: 28px;
      color: var(--indigo);
      font-size: clamp(1.8rem, 4vw, 3.15rem);
      line-height: 1.45;
    }

    h3 {
      color: var(--indigo);
      font-size: clamp(1.25rem, 2.5vw, 1.8rem);
      line-height: 1.5;
    }

    p {
      margin-bottom: 1.4em;
      font-size: 1.08rem;
      }

    .section-text {
      font-size: 1.125rem;
      line-height: 1.8;
      color: var(--indigo);
      font-weight: 400;
    }

    .lead {
      font-size: clamp(1.08rem, 2vw, 1.3rem);
      line-height: 2;
      color: var(--indigo);
      font-weight: 500;
    }

    .lead2 {
      font-size: clamp(1.08rem, 2vw, 1.3rem);
      line-height: 2;
      color: #d8bd72;
      font-weight: 500;
    }

    .accent {
      color: var(--vermilion);
    }

    .gold {
      color: var(--gold);
    }

    .marker {
      background:
        linear-gradient(
          transparent 60%,
          rgba(195, 158, 55, 0.50) 60%
        );
    }

    .hero {
      position: relative;
      overflow: hidden;
      padding: 56px 0 76px;
      color: var(--white);
      background:
        radial-gradient(circle at 75% 25%, rgba(185,154,75,0.24), transparent 24%),
        linear-gradient(135deg, #111c2d 0%, var(--indigo) 55%, #233955 100%);
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      opacity: 0.22;
      background-image:
        linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
      background-size: 32px 32px;
      pointer-events: none;
    }

    .hero-inner {
      position: relative;
      z-index: 1;
      align-items: center;
    }

    .hero-copy {
      padding: 24px 0;
    }

    .hero-kicker {
      margin-bottom: 18px;
      color: var(--gold-light);
      font-size: 1.0rem;
      font-weight: 700;
      letter-spacing: 0.2em;
    }

    .hero-title {
      font-size: clamp(2.3rem, 6vw, 5rem);
    }

    .hero h1 span {
      display: block;
    }

    .hero-title-nowrap {
      white-space: nowrap;
    }

    .hero-sub {
      margin-bottom: 28px;
      color: #f1ede3;
      font-size: clamp(1.05rem, 2vw, 1.25rem);
      line-height: 1.9;
    }

    .hero-price {
      margin-bottom: 26px;
      color: #f5dfaa;
      font-size: 1rem;
      font-weight: 700;
    }

    .hero-image-wrap {
      position: relative;
    }

    .hero-image {
      overflow: hidden;
      border: 1px solid rgba(216,189,114,0.55);
      border-radius: 26px;
      box-shadow: 0 30px 70px rgba(0,0,0,0.38);
      background: #d9ccb0;
    }

    .hero-image img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: cover;
    }

    .hero-caption {
      position: absolute;
      right: 18px;
      bottom: -18px;
      padding: 12px 18px;
      border: 1px solid rgba(185,154,75,0.65);
      border-radius: 999px;
      color: var(--indigo);
      background: var(--paper-light);
      box-shadow: var(--shadow);
      font-size: 0.9rem;
      font-weight: 700;
    }

    .btn-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .btn {
      display: inline-block;
      padding: 15px 24px;
      border: 1px solid transparent;
      border-radius: 999px;
      text-decoration: none;
      font-weight: 700;
      line-height: 1.4;
      transition: 0.2s ease;
    }

    .btn-primary {
      color: var(--white);
      background: var(--vermilion);
      box-shadow: 0 9px 24px rgba(185,71,47,0.24);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      background: var(--vermilion-dark);
    }

    .btn-light {
      color: var(--indigo);
      border-color: rgba(185,154,75,0.65);
      background: var(--paper-light);
    }

    .btn-light:hover {
      transform: translateY(-2px);
      background: #ffffff;
    }

    .proof-strip {
      margin-top: -1px;
      padding: 28px 0;
      color: var(--paper-light);
      background: #0f1928;
    }

    .proof-strip p {
      margin: 0;
      text-align: center;
      font-size: 0.98rem;
    }

    .intro {
      text-align: center;
    }

    .intro p {
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .problem-box {
      padding: 44px;
      border: 1px solid rgba(22,36,59,0.12);
      border-radius: var(--radius);
      background: rgba(255,255,255,0.56);
      box-shadow: var(--shadow);
    }

    .problem-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px 24px;
      margin: 28px 0 0;
      padding: 0;
      list-style: none;
    }

    .problem-list li {
      position: relative;
      padding: 14px 14px 14px 42px;
      border-bottom: 1px dashed rgba(40, 79, 142, 0.70);
      font-size: 1.125rem;
    }

    .problem-list li::before {
      content: "✔";
      position: absolute;
      left: 14px;
      top: 13px;
      color: var(--vermilion);
      font-weight: 700;
    }

    .dark-section {
      color: #f3efe6;
      background:
        radial-gradient(circle at 18% 20%, rgba(185,154,75,0.16), transparent 22%),
        linear-gradient(135deg, #101a2a, #1d3049);
    }

    .dark-section h2,
    .dark-section h3 {
      color: #fffaf0;
    }

    .dark-section .eyebrow {
      color: var(--gold-light);
    }

    .quote-box {
      margin: 42px 0;
      padding: 36px 38px;
      border-left: 4px solid var(--gold);
      background: rgba(255,255,255,0.06);
      font-size: clamp(1.25rem, 3vw, 1.85rem);
      line-height: 1.7;
    }

    .books-grid {
      margin-top: 42px;
    }

    .book-card {
      display: flex;
      flex-direction: column;
      overflow: hidden;
      border: 1px solid rgba(22,36,59,0.12);
      border-radius: var(--radius);
      background: var(--paper-light);
      box-shadow: var(--shadow);
    }

    .book-image {
      background: #e6dbc2;
    }

    .book-body {
      display: flex;
      flex: 1;
      flex-direction: column;
      padding: 28px 26px 30px;
    }

    .book-label {
      display: inline-block;
      align-self: flex-start;
      margin-bottom: 14px;
      padding: 6px 12px;
      border-radius: 999px;
      color: var(--vermilion-dark);
      background: #f4e1d8;
      font-size: 0.9rem;
      font-weight: 700;
    }

    .book-body p {
      font-size: 0.96rem;
    }

    .book-meta {
      margin-top: auto;
      padding-top: 12px;
      color: var(--muted);
      font-size: 0.9rem;
    }

    .book-body .btn {
      margin-top: 12px;
      text-align: center;
    }

    .choice-box {
      margin-top: 52px;
      padding: 38px;
      border: 1px solid rgba(185,154,75,0.5);
      border-radius: var(--radius);
      background:
        linear-gradient(135deg, rgba(255,255,255,0.75), rgba(245,240,229,0.95));
    }

    .choice-grid {
      margin-top: 28px;
    }

    .choice-item {
      padding: 22px;
      border-top: 3px solid var(--vermilion);
      background: rgba(255,255,255,0.7);
    }

    .choice-item strong {
      display: block;
      margin-bottom: 8px;
      color: var(--indigo);
      font-size: 1.05rem;
    }

    .story {
      align-items: center;
    }

    .story-image img {
      width: 100%;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    .future-box {
      padding: 48px;
      border: 1px solid rgba(185,154,75,0.45);
      border-radius: var(--radius);
      background:
        radial-gradient(circle at 85% 15%, rgba(185,154,75,0.13), transparent 30%),
        #fffdf8;
    }

    .cta-section {
      text-align: center;
      color: var(--white);
      background:
        radial-gradient(circle at 50% 10%, rgba(185,154,75,0.21), transparent 32%),
        var(--indigo);
    }

    .cta-section h2 {
      color: var(--white);
    }

    .cta-section .lead {
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
      color: #f1ecdf;
    }

    .cta-buttons {
      justify-content: center;
      margin-top: 30px;
    }

    .faq {
      display: grid;
      gap: 18px;
    }

    .faq-item {
      padding: 30px 30px 10px;
      border-left: 4px solid var(--vermilion);
      background: rgba(255,255,255,0.65);
      box-shadow: 0 8px 24px rgba(20,27,39,0.06);
    }

    .faq-q {
      margin-bottom: 14px;
      color: var(--indigo);
      font-weight: 700;
      font-size: 1.12rem;
    }

    .profile {
      display: grid;
      grid-template-columns: 220px 1fr;
      gap: 36px;
      align-items: center;
      padding: 42px;
      border-radius: var(--radius);
      background: var(--paper-light);
      box-shadow: var(--shadow);
    }

    .profile img {
      width: 100%;
      border-radius: 16px;
      border: 1px solid rgba(185,154,75,0.45);
    }

    .ps {
      padding: 44px;
      border-top: 1px solid rgba(185,154,75,0.55);
      border-bottom: 1px solid rgba(185,154,75,0.55);
    }

    .small-print {
      color: var(--muted);
      font-size: 0.88rem;
      line-height: 1.8;
    }

    footer {
      padding: 42px 0;
      color: #bfc5ce;
      background: #0c1522;
      text-align: center;
      font-size: 0.85rem;
    }

    @media (max-width: 900px) {
      .hero-inner,
      .story {
        grid-template-columns: 1fr;
      }

      .hero-copy {
        text-align: center;
      }

      .hero-title {
        text-align: center;
      }

      .hero .btn-row {
        justify-content: center;
      }

      .hero-image-wrap {
        max-width: 100%;
        margin: 0 auto;
      }

      .books-grid,
      .choice-grid {
        grid-template-columns: 1fr;
      }

      .problem-list {
        grid-template-columns: 1fr;
      }

      .profile {
        grid-template-columns: 1fr;
      }

      .profile img {
        max-width: 240px;
      }
    }

    @media (max-width: 600px) {
      .container,
      .narrow {
        width: min(calc(100% - 28px), var(--max));
      }

      .section {
        padding: 68px 0;
      }

      .section-small {
        padding: 48px 0;
      }

      .hero {
        padding-top: 32px;
      }

      .hero-inner {
        gap: 34px;
      }

      .hero-caption {
        position: static;
        width: fit-content;
        margin: 12px auto 0;
      }

      .btn {
        width: 100%;
        text-align: center;
      }

      .problem-box,
      .future-box,
      .profile,
      .ps,
      .choice-box {
        padding: 26px 20px;
      }

      .quote-box {
        padding: 26px 22px;
      }

      p {
        font-size: 0.98rem;
      }
    }