:root {
      --primary: #2f80ed;
      --primary-dark: #1f6fd1;
      --secondary: #13263b;
      --accent: #128a56;
      --danger: #ef4444;
      --bg: #f8fbff;
      --surface: #ffffff;
      --surface-soft: #eef6ff;
      --text: #1c2b3d;
      --muted: #5a738d;
      --border: #d9e6f2;
      --radius: 18px;
      --shadow: 0 12px 32px rgba(20,39,61,.1);
      --shadow-sm: 0 4px 12px rgba(20,39,61,.05);
      --max: 1140px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 90px;
    }

    body {
      margin: 0;
      font-family: 'Plus Jakarta Sans', sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.65;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      color: inherit;
    }

    .container {
      width: min(var(--max), calc(100% - 40px));
      margin: 0 auto;
    }

    .text-muted {
      color: var(--muted);
    }

    .text-primary {
      color: var(--primary);
    }

    .text-success {
      color: var(--accent);
    }

    .text-danger {
      color: var(--danger);
    }

    .text-mono {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.92rem;
    }

    .small {
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .section {
      padding: 82px 0;
    }

    .section-alt {
      background: #fff;
    }

    .section-header {
      max-width: 820px;
      margin: 0 auto 48px;
      text-align: center;
    }

    .section-header h2 {
      margin: 0 0 16px;
      font-size: clamp(2rem, 3.6vw, 2.8rem);
      line-height: 1.1;
      letter-spacing: -0.04em;
      font-weight: 800;
    }

    .section-header p {
      margin: 0 auto;
      color: var(--muted);
      font-size: 1.08rem;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #fff;
      border: 1px solid var(--border);
      color: var(--primary);
      padding: 8px 16px;
      border-radius: 999px;
      font-weight: 800;
      font-size: 0.84rem;
      box-shadow: var(--shadow-sm);
      margin-bottom: 20px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 16px 28px;
      border-radius: 12px;
      border: 1px solid transparent;
      font-weight: 800;
      text-decoration: none;
      cursor: pointer;
      transition: 0.25s ease;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 8px 20px rgba(47,128,237,0.25);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: #fff;
      color: var(--secondary);
      border-color: var(--border);
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .nav-master {
      position: sticky;
      top: 0;
      z-index: 2000;
      background: rgba(255,255,255,.92);
      backdrop-filter: blur(12px) saturate(180%);
      border-bottom: 1px solid rgba(217,230,242,.85);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      gap: 20px;
    }

    .brand-identity {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .logo-icon {
      width: 42px;
      height: 42px;
      background: linear-gradient(135deg, #2f80ed 0%, #1f63c2 100%);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(47,128,237,.25);
    }

    .logo-icon i {
      color: #fff;
      transform: rotate(-15deg);
    }

    .brand-text,
    .brand {
      font-weight: 800;
      font-size: 1.55rem;
      color: var(--secondary);
      letter-spacing: -1px;
      text-decoration: none;
    }

    .brand-text span,
    .brand span {
      color: var(--primary);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-menu a {
      color: var(--muted);
      text-decoration: none;
      font-weight: 700;
      font-size: .94rem;
    }

    .nav-menu a:hover {
      color: var(--primary);
    }

    .nav-menu .nav-cta {
      background: var(--secondary);
      color: #fff;
      padding: 10px 20px;
      border-radius: 10px;
    }

    .hero {
      padding: 88px 0 76px;
      background:
        radial-gradient(circle at top right, #eaf3ff 0%, transparent 34%),
        radial-gradient(circle at top left, rgba(18,138,86,.08), transparent 25%),
        var(--bg);
      border-bottom: 1px solid var(--border);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 60px;
      align-items: center;
    }

    .hero h1 {
      margin: 0 0 22px;
      font-size: clamp(2.5rem, 5vw, 4.35rem);
      line-height: 1.04;
      letter-spacing: -0.055em;
      font-weight: 800;
    }

    .hero h1 span {
      color: var(--primary);
    }

    .lead {
      font-size: 1.15rem;
      color: var(--muted);
      max-width: 680px;
      margin: 0 0 30px;
    }

    .btn-group {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      margin-bottom: 26px;
    }

    .trust-icons {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
      color: var(--muted);
      font-size: .9rem;
      font-weight: 800;
    }

    .hero-card,
    .card,
    .matrix-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      padding: 28px;
    }

    .hero-card {
      box-shadow: var(--shadow);
    }

    .hero-card h2,
    .hero-card h3,
    .card h3,
    .matrix-card h3 {
      margin-top: 0;
      line-height: 1.25;
    }

    .metric-list {
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .metric-list li {
      display: flex;
      justify-content: space-between;
      gap: 18px;
      padding: 12px 0;
      border-bottom: 1px solid var(--border);
    }

    .metric-list li:last-child {
      border-bottom: 0;
    }

    .proof-grid,
    .grid-2,
    .grid-3,
    .grid-4 {
      display: grid;
      gap: 24px;
    }

    .grid-2 {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .grid-3 {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .grid-4 {
      grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .proof-item {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .proof-item strong {
      display: block;
      font-size: 1.55rem;
      color: var(--secondary);
    }

    .testimonial {
      background: var(--surface-soft);
      border: 1px solid #d0e4ff;
      border-radius: var(--radius);
      padding: 24px;
    }

    .testimonial p {
      margin-top: 0;
    }

    .steps {
      counter-reset: steps;
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 20px;
    }

    .steps li {
      counter-increment: steps;
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .steps li::before {
      content: counter(steps, decimal-leading-zero);
      display: inline-flex;
      width: 42px;
      height: 42px;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      background: var(--primary);
      color: #fff;
      font-weight: 800;
      margin-bottom: 18px;
    }

    .calculator-card {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 24px;
      box-shadow: var(--shadow);
      padding: 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .range-group {
      margin-bottom: 26px;
    }

    .range-group label {
      display: block;
      font-weight: 800;
      margin-bottom: 10px;
    }

    .range-row {
      display: flex;
      justify-content: space-between;
      font-size: .84rem;
      font-weight: 800;
      margin-top: 6px;
      color: var(--muted);
    }

    input[type="range"] {
      width: 100%;
      accent-color: var(--primary);
    }

    .calc-result {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px;
      text-align: center;
    }

    #total-usage {
      font-size: clamp(2.8rem, 5vw, 4rem);
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin: 16px 0;
    }

    .table-wrap {
      overflow-x: auto;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: var(--shadow);
    }

    table {
      width: 100%;
      min-width: 760px;
      border-collapse: collapse;
    }

    th,
    td {
      padding: 18px 20px;
      text-align: left;
      border-bottom: 1px solid var(--border);
      vertical-align: top;
    }

    th {
      background: var(--secondary);
      color: #fff;
      font-size: .88rem;
      text-transform: uppercase;
      letter-spacing: .04em;
    }

    tr:last-child td {
      border-bottom: 0;
    }

    td {
      color: var(--muted);
    }

    td strong {
      color: var(--secondary);
    }

    code {
      font-family: 'JetBrains Mono', monospace;
      background: rgba(47,128,237,.1);
      color: var(--secondary);
      padding: 3px 7px;
      border-radius: 7px;
    }

    .note-box {
      background: #eaf3ff;
      border: 1px solid #d0e4ff;
      border-radius: var(--radius);
      padding: 20px;
      color: var(--secondary);
    }

    .dark-box {
      background: #0f172a;
      color: #fff;
      border-radius: 22px;
      padding: 44px;
      border-left: 8px solid var(--danger);
      box-shadow: var(--shadow);
    }

    .dark-box p {
      color: #94a3b8;
    }

    .dark-box code {
      background: rgba(255,255,255,.12);
      color: #fff;
    }

    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 24px;
    }

    .faq-item:last-child {
      border-bottom: 0;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      margin: 0;
      font-size: 1.1rem;
      cursor: pointer;
    }

    .faq-answer {
      margin-top: 14px;
      color: var(--muted);
    }

    .cta {
      background: var(--secondary);
      color: #fff;
      text-align: center;
    }

    .cta p {
      color: #b0c4de;
      max-width: 760px;
      margin: 0 auto 28px;
    }

    footer {
      background: #0a141f;
      color: #fff;
      padding: 76px 0 36px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 56px;
    }

    .footer-links {
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .footer-links li {
      margin-bottom: 14px;
    }

    .footer-links a {
      color: #8b949e;
      text-decoration: none;
    }

    .footer-links a:hover {
      color: #fff;
    }

    .socials {
      display: flex;
      gap: 14px;
      margin-top: 20px;
    }

    .socials a {
      width: 40px;
      height: 40px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #1c222b;
      color: #fff;
      border-radius: 10px;
      text-decoration: none;
    }

    .footer-bottom {
      border-top: 1px solid #1c2b3d;
      margin-top: 56px;
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
      color: #8b949e;
      font-size: .85rem;
    }

    .footer-bottom a {
      color: #8b949e;
      text-decoration: none;
      margin-left: 14px;
    }

    @media (max-width: 980px) {
      .hero-grid,
      .grid-2,
      .grid-3,
      .grid-4,
      .calculator-card,
      .footer-grid {
        grid-template-columns: 1fr;
      }

      .steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .nav-menu {
        display: none;
      }
    }

    @media (max-width: 640px) {
      .section,
      .hero {
        padding: 58px 0;
      }

      .steps {
        grid-template-columns: 1fr;
      }

      .btn {
        width: 100%;
      }

      .calculator-card,
      .dark-box {
        padding: 26px;
      }

      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }

      .footer-bottom a {
        margin: 0 8px;
      }
    }