/* ===== Animations ===== */
  @keyframes fade-up {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
  }
 
  /* ===== Section Layout ===== */
  .problem-section {
    padding: 80px 24px;
    max-width: 1000px;
    margin: 0 auto;
    background-color: rgba(0, 0, 0, 0.7);
    border: 0.2px solid rgba(255, 255, 255, 0.4);
    border-radius: 20px;
  }
 
  /* ===== Header ===== */
  .problem-header {
    margin-bottom: 2.5rem;
    animation: fade-up 0.5s ease-out both;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
  }
 
  .problem-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 5px 14px;
    border-radius: 100px;
    background: rgba(226, 75, 74, 0.12);
    border: 1px solid rgba(226, 75, 74, 0.2);
    margin-bottom: 1.1rem;
  }
 
  .problem-badge svg {
    width: 12px;
    height: 12px;
    flex-shrink: 0;
  }
 
  .problem-badge span {
    font-size: 18px;
    font-weight: 600;
    color: #e24b4a;
    letter-spacing: 0.02em;
  }
 
  .problem-title {
    font-size: clamp(3.6rem, 4vw, 2.2rem);
    font-weight: 700;
    line-height: 1.15;
    color: #ffffff;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
  }
 
  .problem-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.45);
  }
 
  /* ===== Card Grid ===== */
  .problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 10px;
    margin-bottom: 1.25rem;
  }
 
  /* ===== Individual Card ===== */
  .problem-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color 0.2s ease, background 0.2s ease;
    animation: fade-up 0.4s ease-out both;
  }
 
  .problem-card:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.15);
  }
 
  .problem-card:nth-child(1) { animation-delay: 0.05s; }
  .problem-card:nth-child(2) { animation-delay: 0.10s; }
  .problem-card:nth-child(3) { animation-delay: 0.15s; }
  .problem-card:nth-child(4) { animation-delay: 0.20s; }
  .problem-card:nth-child(5) { animation-delay: 0.25s; }
  .problem-card:nth-child(6) { animation-delay: 0.30s; }
 
  .problem-num {
    font-size: 11px;
    font-weight: 600;
    color: #e24b4a;
    letter-spacing: 0.07em;
    text-transform: uppercase;
  }
 
  .problem-card-title {
    font-size: 25px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.3;
    margin: 0;
  }
 
  .problem-card-desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.4);
    line-height: 1.6;
    margin: 0;
    flex: 1;
  }
 
  /* Severity bar */
  .problem-bar {
    height: 3px;
    border-radius: 2px;
    background: rgba(226, 75, 74, 0.15);
    margin-top: 4px;
    overflow: hidden;
  }
 
  .problem-bar-fill {
    height: 100%;
    border-radius: 2px;
    background: #e24b4a;
  }
 
  /* ===== Footer Note ===== */
  .problem-note {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.03);
    animation: fade-up 0.4s ease-out 0.35s both;
  }
 
  .problem-note svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.4;
  }
 
  .problem-note p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.45);
    line-height: 1.6;
    margin: 0;
  }
 
  /* ===== Responsive ===== */
  @media (max-width: 480px) {
    .problem-section { padding: 60px 16px; border: none; }
    .problem-grid { grid-template-columns: 1fr; }
    .problem-title { font-size: 40px; text-align: center;}
    .problem-subtitle { font-size: 16px;text-align: center;}
  }