:root {
    --bg: #08050a;
    --pink: #ff60a0;
    --pink-dim: #d81b60;
    --blue: #4fc3f7;
    --line-green: #06C755;
    --line-green-dark: #05a847;
    --white: #f5f5f5;
    --sub: #888;
  }

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

  body {
    font-family: 'Noto Sans JP', sans-serif;
    background: var(--bg);
    color: var(--white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
  }

  /* ── 背景エフェクト ── */
  .bg-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
    z-index: 0;
  }
  .orb-pink {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(255,96,160,0.18) 0%, transparent 70%);
    top: -150px; left: -100px;
    animation: drift1 12s ease-in-out infinite alternate;
  }
  .orb-blue {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(79,195,247,0.14) 0%, transparent 70%);
    bottom: -100px; right: -80px;
    animation: drift2 15s ease-in-out infinite alternate;
  }
  .orb-pink2 {
    width: 250px; height: 250px;
    background: radial-gradient(circle, rgba(255,96,160,0.1) 0%, transparent 70%);
    bottom: 30%; right: 20%;
    animation: drift1 18s ease-in-out infinite alternate-reverse;
  }

  @keyframes drift1 {
    from { transform: translate(0, 0); }
    to   { transform: translate(40px, 30px); }
  }
  @keyframes drift2 {
    from { transform: translate(0, 0); }
    to   { transform: translate(-30px, -40px); }
  }

  /* グリッドライン背景 */
  .grid-bg {
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(rgba(255,96,160,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,96,160,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 0;
    pointer-events: none;
  }

  /* ── メインカード ── */
  .card-wrap {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 400px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
  }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(32px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  /* ── ロゴ ── */
  .logo-area {
    text-align: center;
    margin-bottom: 2.5rem;
    animation: fadeUp 0.8s 0.1s cubic-bezier(0.16, 1, 0.3, 1) both;
  }
  .logo-eyebrow {
    font-size: 0.65rem;
    letter-spacing: 0.35em;
    color: var(--sub);
    text-transform: uppercase;
    margin-bottom: 0.6rem;
  }
  .logo-title {
    font-family: 'Montserrat', sans-serif;
    font-style: italic;
    font-weight: 800;
    font-size: clamp(2.8rem, 12vw, 3.8rem);
    background: linear-gradient(135deg, #ffcce0 0%, #ff60a0 45%, #d81b60 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    letter-spacing: 0.04em;
    filter: drop-shadow(0 0 20px rgba(255,96,160,0.35));
  }
  .logo-sub {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.4em;
    color: var(--blue);
    margin-top: 0.5rem;
    text-transform: uppercase;
    opacity: 0.9;
  }

  /* ── ガラスカード ── */
  .glass-card {
    width: 100%;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.09);
    border-radius: 20px;
    padding: 2rem 1.75rem 2rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow:
      0 0 0 1px rgba(255,96,160,0.06),
      0 20px 60px rgba(0,0,0,0.6),
      inset 0 1px 0 rgba(255,255,255,0.08);
    animation: fadeUp 0.8s 0.2s cubic-bezier(0.16, 1, 0.3, 1) both;
  }

  /* キャンペーン概要 */
  .campaign-info {
    text-align: center;
    margin-bottom: 1.75rem;
  }
  .campaign-info h2 {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--white);
    margin-bottom: 0.5rem;
  }
  .campaign-info p {
    font-size: 0.78rem;
    color: var(--sub);
    line-height: 1.7;
  }

  /* ステップ表示 */
  .steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;
    margin-bottom: 2rem;
  }
  .step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
  }
  .step-circle {
    width: 32px; height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: 'Montserrat', sans-serif;
  }
  .step-circle.active {
    background: linear-gradient(135deg, #ff60a0, #d81b60);
    color: white;
    box-shadow: 0 0 14px rgba(255,96,160,0.5);
  }
  .step-circle.inactive {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    color: var(--sub);
  }
  .step-label {
    font-size: 0.6rem;
    color: var(--sub);
    letter-spacing: 0.05em;
    white-space: nowrap;
  }
  .step-label.active { color: var(--pink); }
  .step-connector {
    width: 36px;
    height: 1px;
    background: linear-gradient(90deg, rgba(255,96,160,0.4), rgba(255,255,255,0.1));
    margin: 0 4px;
    margin-bottom: 18px;
  }

  /* 区切り */
  .divider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.5rem 0;
  }
  .divider::before, .divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: rgba(255,255,255,0.08);
  }
  .divider span {
    font-size: 0.7rem;
    color: var(--sub);
    letter-spacing: 0.1em;
    white-space: nowrap;
  }

  /* LINEボタン */
  .btn-line {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    padding: 1rem 1.5rem;
    background: var(--line-green);
    border: none;
    border-radius: 50px;
    color: white;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 4px 20px rgba(6,199,85,0.35);
    position: relative;
    overflow: hidden;
  }
  .btn-line::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, transparent 100%);
    pointer-events: none;
  }
  .btn-line:hover {
    background: var(--line-green-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(6,199,85,0.45);
  }
  .btn-line:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(6,199,85,0.3);
  }

  /* LINEアイコンSVG */
  .line-icon {
    width: 26px; height: 26px;
    flex-shrink: 0;
  }

  /* 特典バナー */
  .benefit-row {
    display: flex;
    gap: 0.6rem;
    margin-bottom: 1.75rem;
  }
  .benefit-item {
    flex: 1;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 10px;
    padding: 0.75rem 0.5rem;
    text-align: center;
  }
  .benefit-icon { font-size: 1.3rem; margin-bottom: 0.3rem; }
  .benefit-label {
    font-size: 0.68rem;
    color: var(--sub);
    line-height: 1.4;
  }
  .benefit-label strong { color: var(--white); display: block; font-size: 0.72rem; }

  /* 注意書き */
  .note-text {
    font-size: 0.68rem;
    color: var(--sub);
    text-align: center;
    line-height: 1.7;
    margin-top: 1.25rem;
  }
  .note-text a { color: var(--blue); text-decoration: underline; }

  /* ローディング状態 */
  .btn-line.loading {
    pointer-events: none;
    opacity: 0.8;
  }
  .spinner {
    display: none;
    width: 20px; height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }

  /* パーティクル装飾 */
  .particle {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
    opacity: 0;
    animation: floatUp var(--dur, 8s) var(--delay, 0s) ease-in-out infinite;
  }
  @keyframes floatUp {
    0%   { transform: translateY(0) scale(1); opacity: 0; }
    10%  { opacity: var(--op, 0.6); }
    90%  { opacity: var(--op, 0.6); }
    100% { transform: translateY(-100vh) scale(0.5); opacity: 0; }
  }

  /* フッター */
  .footer-note {
    position: fixed;
    bottom: 1.5rem;
    font-size: 0.65rem;
    color: rgba(255,255,255,0.2);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    z-index: 10;
    animation: fadeUp 1s 0.5s both;
  }