:root {
    --bg:        #0a0812;
    --surface:   #110f1e;
    --border:    #2a2040;
    --gold:      #c9a84c;
    --gold-dim:  #7a6228;
    --purple:    #6b3fa0;
    --purple-lt: #9b6fd0;
    --text:      #e8e0f0;
    --muted:     #8b7fa8;
    --error:     #e07070;
    --success:   #70c090;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Noto Serif JP', serif;
    font-weight: 300;
    min-height: 100vh;
    overflow-x: hidden;
  }

  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
      radial-gradient(ellipse at 20% 10%, rgba(107,63,160,0.12) 0%, transparent 50%),
      radial-gradient(ellipse at 80% 80%, rgba(201,168,76,0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
  }

  .stars {
    position: fixed; inset: 0;
    pointer-events: none; z-index: 0; overflow: hidden;
  }
  .stars span {
    position: absolute; border-radius: 50%; background: white;
    animation: twinkle var(--d, 3s) ease-in-out infinite alternate; opacity: 0;
  }
  @keyframes twinkle { 0% { opacity: 0; } 100% { opacity: var(--o, 0.5); } }

  header {
    position: relative; z-index: 10;
    text-align: center; padding: 40px 20px 28px;
    border-bottom: 1px solid var(--border);
  }
  .site-title-link { text-decoration: none; }
  .site-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 300; font-style: italic;
    color: var(--text); letter-spacing: 0.05em;
    text-shadow: 0 0 30px rgba(201,168,76,0.25);
  }
  .site-title span { color: var(--gold); }

  .breadcrumb {
    position: relative; z-index: 10;
    max-width: 640px; margin: 0 auto;
    padding: 16px 24px;
    font-size: 0.72rem; color: var(--muted); letter-spacing: 0.1em;
  }
  .breadcrumb a { color: var(--muted); text-decoration: none; transition: color 0.3s; }
  .breadcrumb a:hover { color: var(--gold); }
  .breadcrumb span { margin: 0 8px; opacity: 0.4; }

  main {
    position: relative; z-index: 10;
    max-width: 640px; margin: 0 auto;
    padding: 40px 24px 80px;
    animation: fadeUp 0.7s ease forwards; opacity: 0;
  }
  @keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

  .page-heading {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.8rem; font-weight: 300; font-style: italic;
    color: var(--text); margin-bottom: 8px;
    text-shadow: 0 0 20px rgba(201,168,76,0.2);
  }
  .page-heading span { color: var(--gold); }

  .page-desc {
    font-size: 0.82rem; color: var(--muted);
    line-height: 1.9; margin-bottom: 40px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
  }

  /* 送信完了 */
  .success-box {
    background: rgba(112,192,144,0.08);
    border: 1px solid rgba(112,192,144,0.3);
    border-radius: 4px;
    padding: 32px;
    text-align: center;
  }
  .success-box .icon { font-size: 2rem; margin-bottom: 16px; }
  .success-box p {
    color: var(--success); font-size: 0.9rem; line-height: 1.9;
  }

  /* エラー */
  .error-list {
    background: rgba(224,112,112,0.08);
    border: 1px solid rgba(224,112,112,0.3);
    border-radius: 4px;
    padding: 16px 20px;
    margin-bottom: 28px;
    list-style: none;
  }
  .error-list li {
    color: var(--error); font-size: 0.82rem;
    line-height: 1.8; padding-left: 12px;
    position: relative;
  }
  .error-list li::before {
    content: '✦'; position: absolute; left: 0;
    font-size: 0.6rem; top: 4px;
  }

  /* フォーム */
  .form-group { margin-bottom: 28px; }

  label {
    display: block;
    font-size: 0.78rem; letter-spacing: 0.15em;
    color: var(--muted); margin-bottom: 8px;
  }
  label .required {
    color: var(--gold); margin-left: 4px; font-size: 0.65rem;
  }

  input[type="text"],
  input[type="email"],
  textarea {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    color: var(--text);
    font-family: 'Noto Serif JP', serif;
    font-size: 0.88rem;
    font-weight: 300;
    padding: 14px 16px;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
    -webkit-appearance: none;
  }
  input[type="text"]:focus,
  input[type="email"]:focus,
  textarea:focus {
    border-color: var(--gold-dim);
    box-shadow: 0 0 0 3px rgba(201,168,76,0.08);
  }
  textarea { resize: vertical; min-height: 160px; line-height: 1.8; }

  input::placeholder, textarea::placeholder { color: var(--muted); opacity: 0.5; }

  .submit-btn {
    display: block;
    width: 100%;
    padding: 16px;
    background: transparent;
    border: 1px solid var(--gold-dim);
    color: var(--gold);
    font-family: 'Cormorant Garamond', serif;
    font-size: 1rem;
    font-style: italic;
    letter-spacing: 0.2em;
    cursor: pointer;
    border-radius: 2px;
    transition: background 0.3s, border-color 0.3s, color 0.3s;
    margin-top: 8px;
  }
  .submit-btn:hover {
    background: rgba(201,168,76,0.08);
    border-color: var(--gold);
    color: var(--text);
  }

  .back-link {
    display: inline-flex; align-items: center; gap: 8px;
    color: var(--muted); text-decoration: none;
    font-size: 0.78rem; letter-spacing: 0.1em;
    margin-top: 40px; padding: 10px 20px;
    border: 1px solid var(--border); border-radius: 2px;
    transition: border-color 0.3s, color 0.3s;
  }
  .back-link:hover { border-color: var(--gold-dim); color: var(--gold); }

  footer {
    position: relative; z-index: 10;
    text-align: center; padding: 28px 20px;
    border-top: 1px solid var(--border);
    font-size: 0.72rem; color: var(--muted); letter-spacing: 0.1em;
  }
  footer a { color: var(--muted); text-decoration: none; }
  footer a:hover { color: var(--gold); }