:root {
    --black: #030303;
    --panel: #111;
    --panel-soft: #181818;
    --line: rgba(255, 255, 255, 0.16);
    --text: #f5f1e8;
    --muted: #c8c0b4;
    --gold: #c89a43;
    --gold-dark: #8f6428;
    --max: 1120px;
    /* 「未来の自分を変える第一歩を、ここから。」の背景画像URL */
    --cta-background-image: url("assets/audition.png");
  }
   
  * {
    box-sizing: border-box;
  }
   
  html {
    scroll-behavior: smooth;
  }
   
  body {
    margin: 0;
    background: var(--black);
    color: var(--text);
    font-family: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Times New Roman", serif;
    line-height: 1.8;
  }
   
  a {
    color: inherit;
    text-decoration: none;
  }
   
  img,
  button,
  input {
    font: inherit;
  }
   
  .site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 20;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    min-height: 68px;
    padding: 0 32px;
    background: rgba(0, 0, 0, 0.78);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
  }
   
  .brand {
    display: inline-grid;
    gap: 1px;
    line-height: 1;
  }
   
  .brand-main {
    font-family: Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 0.08em;
  }
   
  .brand-sub {
    font-family: Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
    font-size: 9px;
    letter-spacing: 0.08em;
    color: var(--muted);
  }
   
  .global-nav {
    display: flex;
    justify-content: center;
    gap: 28px;
    font-family: Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
    font-size: 12px;
    font-weight: 700;
  }
   
  .global-nav a {
    opacity: 0.86;
    transition: color 0.2s ease, opacity 0.2s ease;
  }
   
  .global-nav a:hover {
    color: var(--gold);
    opacity: 1;
  }
   
  .header-cta,
  .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 24px;
    border: 0;
    color: #fff;
    background: linear-gradient(135deg, var(--gold-dark), var(--gold));
    font-family: Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, filter 0.2s ease;
  }
   
  .header-cta:hover,
  .button:hover {
    transform: translateY(-2px);
    filter: brightness(1.08);
  }
   
  .nav-toggle {
    display: none;
  }
   
  .hero {
    min-height: 760px;
    display: flex;
    align-items: center;
    padding: 116px max(28px, calc((100vw - var(--max)) / 2)) 70px;
    background:
      linear-gradient(90deg, rgba(0, 0, 0, 0.94) 0%, rgba(0, 0, 0, 0.72) 35%, rgba(0, 0, 0, 0.18) 72%),
      url("assets/hero-dance-shifted.png") center right / cover no-repeat;
  }
   
  .hero-copy {
    width: min(620px, 100%);
  }
   
  .hero-label {
    display: inline-block;
    margin: 0 0 22px;
    padding: 6px 17px;
    border: 1px solid rgba(200, 154, 67, 0.7);
    color: #d8ad59;
    font-size: clamp(24px, 4vw, 38px);
    line-height: 1.35;
  }
   
  .hero h1 {
    margin: 0;
    font-size: clamp(38px, 5.6vw, 66px);
    font-weight: 500;
    line-height: 1.35;
    word-break: keep-all;
    overflow-wrap: normal;
  }
   
  .hero-lead {
    margin: 28px 0 22px;
    font-size: clamp(16px, 2.4vw, 21px);
  }
   
  .hero-meta {
    display: grid;
    gap: 7px;
    margin: 0 0 28px;
  }
   
  .hero-meta div {
    display: flex;
    gap: 18px;
  }
   
  .hero-meta dt {
    min-width: 42px;
    color: var(--muted);
  }
   
  .hero-meta dd {
    margin: 0;
  }
   
  .section {
    padding: 78px 28px;
  }
   
  .section-inner {
    width: min(var(--max), 100%);
    margin: 0 auto;
  }
   
  .section-kicker {
    margin: 0 0 8px;
    color: var(--gold);
    font-family: Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 0.08em;
  }
   
  h2 {
    margin: 0 0 24px;
    font-size: clamp(25px, 3.2vw, 38px);
    font-weight: 500;
    line-height: 1.45;
  }
   
  h3 {
    margin: 0 0 10px;
    font-size: 20px;
    font-weight: 500;
  }
   
  p {
    color: var(--muted);
  }
   
  .concept,
  .lesson,
  .recommended {
    background: var(--panel);
  }
   
  .concept-grid {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 52px;
    align-items: center;
  }
   
  .concept-photo {
    min-height: 330px;
    border: 1px solid var(--line);
    background:
      linear-gradient(90deg, rgba(0, 0, 0, 0.35), rgba(0, 0, 0, 0)),
      url("assets/concept.png") center / cover no-repeat;
    clip-path: polygon(8% 0, 100% 0, 92% 100%, 0% 100%);
    filter: grayscale(1);
  }
   
  .instructor-photo {
    display: block;
    width: 332px;
    max-width: 100%;
    height: auto;
  }
   
  .section-title {
    text-align: center;
  }

  .reason-logo {
    display: block;
    width: 111px;
    height: 129px;
    margin: 0 auto 24px;
  }
   
  .reason-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin-top: 44px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
   
  .reason-card {
    min-height: 270px;
    padding: 34px 32px;
    border-right: 1px solid var(--line);
    text-align: center;
  }
   
  .reason-card:last-child {
    border-right: 0;
  }
   
  .reason-number {
    display: block;
    color: var(--gold);
    font-family: Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
    font-size: 26px;
    font-weight: 700;
    text-align: left;
  }
   
  .reason-icon {
    display: block;
    margin: 14px 0 18px;
  }

  .reason-icon img {
    display: block;
    margin: 0 auto;
    width: 48px;
    height: 48px;
  }
   
  .lesson-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 12px;
  }
   
  .lesson-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 118px;
    padding: 18px 10px;
    border: 1px solid var(--line);
    background: #090909;
    color: var(--text);
    text-align: center;
    font-size: 13px;
  }
   
  .lesson-icon {
    width: 36px;
    height: 36px;
  }
   
  .profile-grid {
    display: grid;
    grid-template-columns: 332px minmax(0, 0.95fr) minmax(0, 1.1fr);
    gap: 34px;
    align-items: stretch;
  }
   
  .profile-text,
  .info-card {
    padding: 34px;
    background: var(--panel-soft);
    border: 1px solid var(--line);
  }
   
  .profile-text ul {
    margin: 0 0 26px;
    padding-left: 20px;
    color: var(--muted);
  }
   
  blockquote {
    margin: 0;
    color: var(--text);
    font-size: 19px;
    line-height: 1.8;
  }

  .no-break {
    white-space: nowrap;
  }
   
  .info-card dl {
    margin: 0 0 24px;
  }
   
  .info-card div {
    display: grid;
    grid-template-columns: 72px 1fr;
    gap: 12px;
    padding: 13px 0;
    border-bottom: 1px solid var(--line);
  }
   
  .info-card dt {
    color: var(--muted);
  }
   
  .info-card dd {
    margin: 0;
  }
   
  .button-secondary {
    width: 100%;
  }
   
  .recommended {
    text-align: center;
  }
   
  .recommend-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }
   
  .recommend-list span.reveal {
    flex: 0 0 auto;
    min-height: 118px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 18px;
    border-bottom: 1px solid rgba(200, 154, 67, 0.45);
    color: var(--muted);
    font-size: 13px;
  }
   
  .recommend-label {
    white-space: nowrap;
  }
   
  .recommend-icon {
    width: 40px;
    height: 40px;
  }
   
  .cta-section {
    padding: 96px 28px;
    text-align: center;
    background:
      linear-gradient(90deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.72)),
      var(--cta-background-image) center / cover no-repeat;
  }
   
  .cta-copy {
    width: min(760px, 100%);
    margin: 0 auto;
  }
   
  .trial-form {
    display: flex;
    justify-content: center;
    margin-top: 30px;
  }
   
  .trial-form .button {
    min-height: 60px;
    padding: 18px 48px;
    font-size: 15px;
  }
   
  .faq details {
    border-top: 1px solid var(--line);
    padding: 22px 0;
  }
   
  .faq details:last-child {
    border-bottom: 1px solid var(--line);
  }
   
  .faq summary {
    cursor: pointer;
    color: var(--text);
    font-size: 18px;
  }

  .photo-gallery {
    width: min(var(--max), calc(100% - 56px));
    margin: 0 auto;
    padding: 0 0 80px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .photo-gallery img {
    display: block;
    width: 100%;
    height: auto;
  }
   
  .site-footer {
    padding: 44px 28px;
    border-top: 1px solid var(--line);
    background: #000;
  }
   
  .footer-inner {
    width: min(var(--max), 100%);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 42px;
    align-items: start;
  }

  .footer-branding {
    display: flex;
    align-items: center;
    gap: 18px;
  }

  .footer-logo {
    display: block;
    flex: 0 0 112px;
    width: 112px;
    height: 134px;
  }
   
  .footer-links {
    display: grid;
    gap: 8px;
    font-size: 13px;
    text-align: center;
    justify-items: center;
  }
   
  .footer-social p {
    margin: 0 0 14px;
    font-family: Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--muted);
  }
   
  .social-icons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px;
  }
   
  .social-icons img {
    width: 84px;
    height: 84px;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
   
  .social-icons a:hover img {
    opacity: 0.85;
    transform: translateY(-2px);
  }
   
  small {
    color: var(--muted);
  }
   
  .footer-copyright {
    display: block;
    width: min(var(--max), 100%);
    margin: 32px auto 0;
    padding-top: 24px;
    border-top: 1px solid var(--line);
    font-size: 12px;
  }
   
  .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
   
  .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
   
  @media (max-width: 980px) {
    .site-header {
      grid-template-columns: auto auto;
      padding: 0 20px;
    }
   
    .nav-toggle {
      display: inline-grid;
      gap: 6px;
      justify-self: end;
      width: 44px;
      height: 44px;
      place-content: center;
      border: 1px solid var(--line);
      background: transparent;
      color: var(--text);
    }
   
    .nav-toggle span {
      display: block;
      width: 18px;
      height: 1px;
      background: currentColor;
    }
   
    .global-nav,
    .header-cta {
      display: none;
    }
   
    .global-nav.is-open {
      position: absolute;
      top: 68px;
      left: 0;
      right: 0;
      display: grid;
      gap: 0;
      padding: 14px 20px 20px;
      background: rgba(0, 0, 0, 0.95);
      border-bottom: 1px solid var(--line);
    }
   
    .global-nav.is-open a {
      padding: 13px 0;
      border-bottom: 1px solid var(--line);
    }
   
    .hero {
      min-height: 690px;
      background-position: 64% center;
    }
   
    .concept-grid,
    .profile-grid {
      grid-template-columns: 1fr;
    }
   
    .reason-list {
      grid-template-columns: 1fr;
    }
   
    .reason-card {
      border-right: 0;
      border-bottom: 1px solid var(--line);
    }
   
    .reason-card:last-child {
      border-bottom: 0;
    }
   
    .lesson-grid {
      grid-template-columns: repeat(3, 1fr);
    }
   
    .footer-inner {
      grid-template-columns: 1fr;
    }
  }
   
  @media (max-width: 560px) {
    .brand-main {
      font-size: 17px;
    }
   
    .hero {
      min-height: 640px;
      padding-inline: 20px;
      background-position: 50% center;
    }

    .section,
    .cta-section {
      padding: 58px 20px;
    }

    .photo-gallery {
      width: calc(100% - 40px);
      grid-template-columns: 1fr;
      gap: 20px;
      padding-bottom: 58px;
    }
   
    .hero-meta div,
    .info-card div {
      grid-template-columns: 1fr;
      display: grid;
      gap: 2px;
    }
   
    .lesson-grid {
      grid-template-columns: repeat(2, 1fr);
    }

    .social-icons img {
      width: 56px;
      height: 56px;
    }
  }