body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #0f1724;
    color: #fff;
    margin: 0;
    padding: 0;
  }


  /* === HEADER === */
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 25px;
    background-color: #111827;
    border-bottom: 2px solid #1f2937;
    border-radius: 10px;
  }

  .logo {
    font-size: 1.6em;
    font-weight: bold;
    color: #f59e0b;
    text-decoration: none;
  }

  .nav-links {
    display: flex;
    gap: 20px;
  }

  .nav-links a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.05em;
    transition: color 0.2s ease;
  }

  .nav-links a:hover {
    color: #f59e0b;
  }

  /* ===== HERO / INTRO ===== */
  .event-hero {
    text-align: center;
    padding: 80px 20px 20px 20px;
    background: linear-gradient(135deg, #1e293b, #0f1724);
  }

  .event-hero h1 {
    font-size: 2.6rem;
    font-weight: bold;
    color: #fbbf24;
    margin-bottom: 20px;
  }

  .event-hero p {
    font-size: 1.2rem;
    color: #d1d5db;
    max-width: 640px;
    margin: auto;
  }

  .event-btn {
    margin-top: 30px;
    background-color: #e63946;
    padding: 14px 24px;
    border-radius: 8px;
    color: #fff;
    font-weight: bold;
    text-decoration: none;
    display: inline-block;
    transition: background 0.2s ease;
  }

  .event-btn:hover { background-color: #c92c38; }

  /* ===== 3 STEP SECTION ===== */
  .event-steps {
    padding: 10px 20px;
    max-width: 980px;
    text-align: center;
    margin: auto;
  }

  .steps-title {
    text-align: center;
    margin-bottom: 50px;
  }

  .steps-title h2 {
    font-size: 2.2rem;
    color: #fbbf24;
  }

  .steps-grid {
    display: grid;
    gap: 25px;
    grid-template-columns: repeat(3, 1fr);
  }

  .step-card {
    background-color: #1e293b;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 6px 16px rgba(255,255,255,0.06);
  }

  .step-card h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: #f59e0b;
  }

  .step-desc {
    color: #e5e7eb;
    margin-bottom: 15px;
    font-size: 1rem;
  }

  .step-detail {
    background-color: #0f1724;
    padding: 15px;
    border-radius: 8px;
    font-size: 0.95rem;
    color: #9ca3af;
    line-height: 1.5;
  }


  /* === FOOTER === */
  footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    background-color: #1e293b;
    border-radius: 12px;
    font-size: 0.95em;
    color: #cbd5e1;
  }

  footer a {
    color: #f59e0b;
    text-decoration: none;
  }

  footer a:hover {
    text-decoration: underline;
  }

  .return-message {
    margin-bottom:15px;
    color:#fbbf24;
    font-weight:normal;
    min-height: 22px;
  }


  @media (max-width: 900px) {
    .steps-grid {
      grid-template-columns: 1fr;
    }
  }



/* =================================== */
.vault-card {
  background: linear-gradient(145deg, #1f2937, #111827);
  border-radius: 18px;
  border: 1px solid #374151;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.vault-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(245, 158, 11, 0.25);
}

.vault-header {
  background: rgba(245,158,11,0.15);
  border-bottom: 1px solid #374151;
  font-size: 1.3rem;
  font-weight: bold;
  color: #fbbf24;
  display: flex;
  align-items: center;
  gap: 10px;
}

.vault-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: #f59e0b; /* i.name 강조 컬러 */
  letter-spacing: 0.5px;
}

.vault-desc {
  font-size: 1rem;
  color: #e5e7eb;
  margin-bottom: 20px;
  line-height: 1.5;
}

/* 버튼 */
.vault-btn {
  background: linear-gradient(135deg, #f59e0b, #f97316);
  border: none;
  color: #000;
  font-weight: bold;
  padding: 12px;
  border-radius: 12px;
  transition: all 0.2s ease;
}

.vault-btn:hover {
  background: linear-gradient(135deg, #fbbf24, #fb923c);
  transform: scale(1.02);
}