/* === BASE STYLES === */:root {
      --color-1: #0a0e1a;
      --color-2: #0d1b3e;
      --color-3: #00e5ff;
      --color-4: #00b8d4;
      --color-5: #ffffff;
      --color-6: #b2ebf2;
      --color-7: #1a2a5e;
      --color-8: #0a1628;
      --color-accent: #00e5ff;
      --color-accent-2: #00b8d4;
      --color-gold: #ffd600;
      --color-warning-bg: rgba(255, 214, 0, 0.08);
      --color-warning-border: rgba(255, 214, 0, 0.35);
      --color-card-bg: rgba(13, 27, 62, 0.85);
      --color-card-border: rgba(0, 229, 255, 0.15);
      --space-1: 0.5rem;
      --space-2: 1rem;
      --space-3: 1.5rem;
      --space-4: 2rem;
      --space-5: 3rem;
      --space-6: 4rem;
      --space-7: 6rem;
      --radius-1: 6px;
      --radius-2: 12px;
      --radius-3: 20px;
      --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
      --shadow-1: 0 4px 24px rgba(0, 229, 255, 0.1);
      --shadow-2: 0 8px 48px rgba(0, 229, 255, 0.18);
      --shadow-card: 0 2px 24px rgba(0, 0, 0, 0.45);
      --transition-1: 0.25s ease;
      --transition-2: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    html, body {
      overflow-x: hidden;
      max-width: 100vw;
      font-family: var(--font-main);
      background-color: var(--color-1);
      color: var(--color-5);
      line-height: 1.7;
      scroll-behavior: smooth;
    }

    ::selection { background: var(--color-3); color: var(--color-1); }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      font-weight: 700;
      border-radius: var(--radius-2);
      transition: all var(--transition-2);
      cursor: pointer;
      text-decoration: none;
      border: none;
      position: relative;
      overflow: hidden;
    }

    .btn::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(255,255,255,0.08);
      opacity: 0;
      transition: opacity var(--transition-1);
    }

    .btn:hover::after { opacity: 1; }

    .btn-primary {
      background: linear-gradient(135deg, var(--color-3), var(--color-4));
      color: var(--color-1);
      padding: 0.75rem 1.75rem;
      font-size: 0.95rem;
      box-shadow: 0 4px 20px rgba(0, 229, 255, 0.35);
      letter-spacing: 0.03em;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 32px rgba(0, 229, 255, 0.55);
      color: var(--color-1);
    }

    .btn-primary:active { transform: translateY(0); }

    .btn-lg {
      padding: 1rem 2.5rem;
      font-size: 1.1rem;
      border-radius: var(--radius-3);
    }

    .btn-xl {
      padding: 1.15rem 3rem;
      font-size: 1.2rem;
      border-radius: var(--radius-3);
    }

    .section-label {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--color-3);
      background: rgba(0, 229, 255, 0.1);
      border: 1px solid rgba(0, 229, 255, 0.25);
      padding: 0.3rem 0.9rem;
      border-radius: 50px;
      margin-bottom: 1rem;
    }

    h1, h2, h3, h4 {
      line-height: 1.2;
      font-weight: 800;
    }

    h2 {
      font-size: clamp(1.6rem, 3.5vw, 2.4rem);
      color: var(--color-5);
      margin-bottom: var(--space-4);
      position: relative;
      padding-bottom: var(--space-2);
    }

    h2::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 60px;
      height: 3px;
      background: linear-gradient(90deg, var(--color-3), transparent);
      border-radius: 2px;
    }

    h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); color: var(--color-5); margin-bottom: var(--space-2); }
    h4 { font-size: 1.05rem; color: var(--color-3); margin-bottom: var(--space-2); }

    p { color: var(--color-6); margin-bottom: var(--space-2); }
    p:last-child { margin-bottom: 0; }

    a { color: var(--color-3); text-decoration: none; transition: color var(--transition-1); }
    a:hover { color: var(--color-5); }

    section { padding: var(--space-7) 0; position: relative; }

    section:nth-child(even) { background: var(--color-8); }

    .card-base {
      background: var(--color-card-bg);
      border: 1px solid var(--color-card-border);
      border-radius: var(--radius-3);
      padding: var(--space-4);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-2), box-shadow var(--transition-2), border-color var(--transition-1);
      height: auto;
    }

    .card-base:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-2);
      border-color: rgba(0, 229, 255, 0.35);
    }

    .highlight-box {
      border-radius: var(--radius-2);
      padding: var(--space-3) var(--space-4);
      margin-top: var(--space-4);
    }

    .highlight-box.warning {
      background: var(--color-warning-bg);
      border: 1px solid var(--color-warning-border);
      border-left: 4px solid var(--color-gold);
    }

    .highlight-box.warning p { color: rgba(255, 214, 0, 0.85); font-size: 0.9rem; }
    .highlight-box.warning strong { color: var(--color-gold); }

    figure.content-image {
      margin: var(--space-4) 0;
      border-radius: var(--radius-2);
      overflow: hidden;
      border: 1px solid var(--color-card-border);
    }

    figure.content-image img {
      display: block;
      width: 100%;
      height: auto;
      max-width: 100%;
    }

    figure.content-image.wide img { max-height: 420px; }
    figure.content-image.portrait img { max-height: none; }

    ul { padding-left: 1.25rem; }
    ul li { color: var(--color-6); margin-bottom: 0.4rem; }
    ul li::marker { color: var(--color-3); }

    dl dt { color: var(--color-5); font-weight: 700; margin-top: var(--space-2); }
    dl dd { color: var(--color-6); margin-left: 0; margin-bottom: var(--space-1); }

    .checklist { list-style: none; padding: 0; }
    .checklist li {
      padding: 0.5rem 0 0.5rem 1.75rem;
      position: relative;
      color: var(--color-6);
      border-bottom: 1px solid rgba(0,229,255,0.06);
    }
    .checklist li::before {
      content: '✓';
      position: absolute;
      left: 0;
      color: var(--color-3);
      font-weight: 700;
    }

    .highlight-list { list-style: none; padding: 0; }
    .highlight-list li {
      padding: 0.6rem 0 0.6rem 1.5rem;
      position: relative;
      color: var(--color-6);
      border-bottom: 1px solid rgba(0,229,255,0.07);
    }
    .highlight-list li::before {
      content: '▸';
      position: absolute;
      left: 0;
      color: var(--color-3);
    }
    .highlight-list li strong { color: var(--color-5); }

    .feature-list { list-style: none; padding: 0; }
    .feature-list li {
      padding: 0.5rem 0 0.5rem 1.5rem;
      position: relative;
      color: var(--color-6);
    }
    .feature-list li::before {
      content: '◆';
      position: absolute;
      left: 0;
      color: var(--color-3);
      font-size: 0.6rem;
      top: 0.8rem;
    }
    .feature-list li strong { color: var(--color-5); }

    /* === LAYOUT STYLES === */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 14, 26, 0.96);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
      padding: 0.85rem 0;
    }

    .site-header .container {
      display: flex;
      align-items: center;
      gap: var(--space-2);
    }

    .logo {
      flex-shrink: 0;
      display: flex;
      align-items: center;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 5px;
      width: 44px;
      height: 44px;
      background: rgba(0,229,255,0.08);
      border: 1px solid rgba(0,229,255,0.2);
      border-radius: var(--radius-1);
      cursor: pointer;
      padding: 0;
      margin-left: auto;
      flex-shrink: 0;
    }

    .hamburger span {
      display: block;
      width: 22px;
      height: 2px;
      background: var(--color-3);
      border-radius: 2px;
      transition: all var(--transition-1);
    }

    .hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    header nav { margin-left: auto; }

    .nav-list {
      display: flex;
      list-style: none;
      padding: 0;
      margin: 0;
      gap: var(--space-3);
      align-items: center;
    }

    .nav-list li a {
      color: var(--color-6);
      font-weight: 600;
      font-size: 0.92rem;
      letter-spacing: 0.03em;
      padding: 0.4rem 0;
      position: relative;
      transition: color var(--transition-1);
    }

    .nav-list li a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-3);
      transition: width var(--transition-2);
    }

    .nav-list li a:hover { color: var(--color-3); }
    .nav-list li a:hover::after { width: 100%; }

    .site-header .cta-button {
      flex-shrink: 0;
      margin-left: var(--space-2);
      max-width: 200px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .site-footer {
      background: var(--color-8);
      border-top: 1px solid rgba(0, 229, 255, 0.1);
      padding: var(--space-5) 0 var(--space-4);
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: var(--space-3);
      text-align: center;
    }

    .footer-nav-list {
      display: flex;
      list-style: none;
      padding: 0;
      margin: 0;
      gap: var(--space-3);
      flex-wrap: wrap;
      justify-content: center;
    }

    .footer-nav-list li a {
      color: rgba(178,235,242,0.6);
      font-size: 0.88rem;
      transition: color var(--transition-1);
    }

    .footer-nav-list li a:hover { color: var(--color-3); }

    .footer-copy {
      color: rgba(178,235,242,0.4);
      font-size: 0.82rem;
      margin: 0;
    }

    @media (max-width: 767.98px) {
      .site-header .container {
        flex-wrap: wrap;
        padding-left: 1rem;
        padding-right: 1rem;
      }

      .hamburger { display: flex; }

      header nav {
        display: none;
        width: 100%;
        order: 3;
        margin-left: 0;
      }

      header nav.open { display: block; }

      .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: var(--space-2) 0;
        border-top: 1px solid rgba(0,229,255,0.1);
      }

      .nav-list li { width: 100%; }
      .nav-list li a {
        display: block;
        padding: 0.7rem 0;
        border-bottom: 1px solid rgba(0,229,255,0.05);
      }

      .site-header .cta-button {
        width: 100%;
        max-width: 100%;
        order: 4;
        margin-left: 0;
        margin-top: 0.5rem;
        text-align: center;
        justify-content: center;
      }
    }

    @media (min-width: 768px) and (max-width: 1023.98px) {
      .site-header .container { gap: 1rem; }
    }

@media (max-width: 767.98px) {
      .site-header .container {
        flex-wrap: wrap;
        padding-left: 1rem;
        padding-right: 1rem;
      }

      .hamburger { display: flex; }

      header nav {
        display: none;
        width: 100%;
        order: 3;
        margin-left: 0;
      }

      header nav.open { display: block; }

      .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: var(--space-2) 0;
        border-top: 1px solid rgba(0,229,255,0.1);
      }

      .nav-list li { width: 100%; }
      .nav-list li a {
        display: block;
        padding: 0.7rem 0;
        border-bottom: 1px solid rgba(0,229,255,0.05);
      }

      .site-header .cta-button {
        width: 100%;
        max-width: 100%;
        order: 4;
        margin-left: 0;
        margin-top: 0.5rem;
        text-align: center;
        justify-content: center;
      }
    }