:root {
    --primary: #0a2540;
    --primary-light: #154a6b;
    --accent: #00d4aa;
    --accent-dark: #00b894;
    --text: #1a1a2e;
    --text-light: #4a5568;
    --bg: #f7fafc;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
  }

  /* Hero Section */
  .hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    padding: 100px 20px 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
  }

  .hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
  }

  .hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
  }

  .hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 30px;
  }

  .hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.2);
  }

  .cta-btn {
    display: inline-block;
    background: var(--accent);
    color: var(--primary);
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 212, 170, 0.3);
  }

  .cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 170, 0.4);
    background: #00e6b8;
  }

  .cta-btn-secondary {
    display: inline-block;
    background: transparent;
    color: white;
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    border: 2px solid rgba(255,255,255,0.3);
    margin-left: 12px;
    transition: var(--transition);
  }

  .cta-btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    border-color: white;
  }

  /* Section Styles */
  .section {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .section-title {
    text-align: center;
    margin-bottom: 60px;
  }

  .section-title h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--primary);
    margin-bottom: 16px;
    font-weight: 800;
  }

  .section-title p {
    color: var(--text-light);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
  }

  .accent-line {
    width: 60px;
    height: 4px;
    background: var(--accent);
    margin: 0 auto 20px;
    border-radius: 2px;
  }

  /* Cards Grid */
  .grid {
    display: grid;
    gap: 24px;
  }

  .grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
  .grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
  .grid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

  .card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

  .card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
  }

  .card-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    color: white;
  }

  .card h3 {
    font-size: 1.25rem;
    color: var(--primary);
    margin-bottom: 12px;
    font-weight: 700;
  }

  .card p, .card li {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
  }

  .card ul {
    list-style: none;
    padding: 0;
  }

  .card ul li {
    padding-left: 20px;
    position: relative;
    margin-bottom: 8px;
  }

  .card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-dark);
    font-weight: bold;
  }

  /* Goal Cards */
  .goal-card {
    border-left: 4px solid var(--accent);
  }

  .goal-tag {
    display: inline-block;
    background: rgba(0, 212, 170, 0.1);
    color: var(--accent-dark);
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
  }

  /* Calculator Section */
  .calc-container {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius);
    padding: 48px;
    color: white;
    box-shadow: var(--shadow-lg);
  }

  .calc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }

  .calc-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    opacity: 0.9;
  }

  .calc-form input, .calc-form select {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.1);
    color: white;
    font-size: 1rem;
    margin-bottom: 20px;
    outline: none;
    transition: var(--transition);
  }

  .calc-form input:focus, .calc-form select:focus {
    border-color: var(--accent);
    background: rgba(255,255,255,0.15);
  }

  .calc-form input::placeholder {
    color: rgba(255,255,255,0.5);
  }

  .calc-result {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 32px;
    border: 1px solid rgba(255,255,255,0.2);
    text-align: center;
  }

  .calc-result .number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    margin: 16px 0;
  }

  .calc-result .unit {
    font-size: 1.25rem;
    opacity: 0.8;
  }

  /* Product Tiers */
  .tier-card {
    text-align: center;
    padding: 40px 24px;
    position: relative;
  }

  .tier-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--accent);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
  }

  .tier-capacity {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin: 16px 0 8px;
    line-height: 1;
  }

  .tier-series {
    color: var(--accent-dark);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
  }

  /* Tables */
  .table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 24px 0;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    font-size: 0.9rem;
  }

  th {
    background: var(--primary);
    color: white;
    padding: 16px;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
  }

  td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-light);
  }

  tr:hover td {
    background: rgba(0, 212, 170, 0.03);
  }

  tr:nth-child(even) {
    background: #f8fafc;
  }

  /* FAQ Accordion */
  .faq-item {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
  }

  .faq-question {
    padding: 20px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    color: var(--primary);
    transition: var(--transition);
  }

  .faq-question:hover {
    background: rgba(0, 212, 170, 0.03);
  }

  .faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--accent-dark);
    transition: transform 0.3s;
  }

  .faq-item.active .faq-question::after {
    transform: rotate(45deg);
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    padding: 0 24px;
  }

  .faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 24px 20px;
  }

  .faq-answer p {
    color: var(--text-light);
    line-height: 1.7;
  }

  /* Quick Ref */
  .quick-ref {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
  }

  .quick-ref-row {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.5fr 1.5fr;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    align-items: center;
  }

  .quick-ref-row.header {
    background: var(--primary);
    color: white;
    font-weight: 700;
  }

  .quick-ref-row:not(.header):hover {
    background: rgba(0, 212, 170, 0.03);
  }

  .quick-ref-row .label {
    font-weight: 700;
    color: var(--primary);
  }

  .quick-ref-row .capacity {
    color: var(--accent-dark);
    font-weight: 700;
  }

  /* Feature List */
  .feature-list {
    list-style: none;
    padding: 0;
  }

  .feature-list li {
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 16px;
  }

  .feature-list li:last-child {
    border-bottom: none;
  }

  .feature-num {
    width: 32px;
    height: 32px;
    background: var(--accent);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
    font-size: 0.875rem;
  }

  /* CTA Section */
  .cta-section {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    padding: 80px 20px;
    text-align: center;
    margin-top: 40px;
  }

  .cta-section h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: 20px;
    font-weight: 800;
  }

  .cta-section p {
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 32px;
    font-size: 1.125rem;
  }

  .cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
  }

  /* Footer */
  .footer {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-light);
    font-size: 0.875rem;
    border-top: 1px solid var(--border);
  }

  .footer a {
    color: var(--accent-dark);
    text-decoration: none;
  }

  /* Animations */
  .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }

  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Responsive */
  @media (max-width: 768px) {
    .hero {
      padding: 60px 20px 50px;
    }
    
    .section {
      padding: 50px 20px;
    }
    
    .calc-grid {
      grid-template-columns: 1fr;
      gap: 32px;
    }
    
    .calc-container {
      padding: 32px 24px;
    }
    
    .quick-ref-row {
      grid-template-columns: 1fr;
      gap: 8px;
      padding: 20px;
    }
    
    .quick-ref-row.header {
      display: none;
    }
    
    .quick-ref-row .label::before {
      content: 'Profile: ';
      font-weight: 400;
      color: var(--text-light);
    }
    
    .quick-ref-row .capacity::before {
      content: 'Capacity: ';
      font-weight: 400;
      color: var(--text-light);
    }
    
    .cta-btn-secondary {
      margin-left: 0;
      margin-top: 12px;
    }
    
    .cta-buttons {
      flex-direction: column;
      align-items: center;
    }
  }

  /* Highlight box */
  .highlight-box {
    background: rgba(0, 212, 170, 0.08);
    border-left: 4px solid var(--accent);
    padding: 20px 24px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 20px 0;
  }

  .highlight-box p {
    margin: 0;
    color: var(--text);
    font-weight: 500;
  }

  .formula-box {
    background: var(--primary);
    color: white;
    padding: 24px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    text-align: center;
    margin: 20px 0;
    overflow-x: auto;
  }

  .link-arrow {
    color: var(--accent-dark);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    transition: var(--transition);
  }

  .link-arrow:hover {
    gap: 10px;
    color: var(--primary);
  }

  .link-arrow::after {
    content: '→';
  }