:root {
      --bg: #f5f7fb;
      --panel: rgba(255,255,255,0.88);
      --panel-strong: #ffffff;
      --text: #162033;
      --muted: #5a667d;
      --line: #d9e0ec;
      --accent: #315efb;
      --accent-2: #6f85ff;
      --shadow: 0 18px 45px rgba(22, 32, 51, 0.10);
      --radius: 22px;
      --maxw: 1100px;
    }

    * { box-sizing: border-box; }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at top left, rgba(111,133,255,0.16), transparent 34%),
        radial-gradient(circle at top right, rgba(49,94,251,0.11), transparent 28%),
        linear-gradient(180deg, #f8faff 0%, #f3f6fb 100%);
      line-height: 1.7;
    }

    .container {
      width: min(calc(100% - 32px), var(--maxw));
      margin: 0 auto;
    }

    .hero-wrap {
      padding: 34px 0 26px;
    }

    .hero {
      background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(248,250,255,0.92));
      border: 1px solid rgba(217,224,236,0.85);
      border-radius: 30px;
      box-shadow: var(--shadow);
      overflow: hidden;
      position: relative;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background:
        radial-gradient(circle at 15% 15%, rgba(49,94,251,0.11), transparent 24%),
        radial-gradient(circle at 85% 10%, rgba(111,133,255,0.12), transparent 22%);
      pointer-events: none;
    }

    .hero-inner {
      position: relative;
      padding: 54px 48px 42px;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 14px;
      border-radius: 999px;
      background: rgba(49,94,251,0.08);
      color: var(--accent);
      font-size: 0.92rem;
      font-weight: 700;
      letter-spacing: 0.02em;
      margin-bottom: 20px;
    }

    h1 {
	  text-align: center;
      margin: 0;
      font-size: clamp(2rem, 4vw, 2.5rem);
      line-height: 1.16;
      letter-spacing: -0.03em;
    }

    .authors {
	  text-align: center;
      margin-top: 18px;
      font-size: 1.2rem;
      color: #315efb;
    }

    .hero-copy {
      margin-top: 18px;
      font-size: 1.02rem;
      color: #33415c;
    }

	.cta-row {
	  display: flex;
	  justify-content: center;
	  flex-wrap: wrap;
	  gap: 14px;
	  margin-top: 28px;
	}
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 13px 20px;
      border-radius: 14px;
      font-weight: 700;
      text-decoration: none;
      transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
    }

    .button.primary {
      background: linear-gradient(135deg, var(--accent), var(--accent-2));
      color: white;
      box-shadow: 0 12px 28px rgba(49,94,251,0.22);
    }

    .button.secondary {
      background: white;
      color: var(--text);
      border: 1px solid var(--line);
    }

    .button:hover {
      transform: translateY(-1px);
    }

    .section {
      margin-top: 28px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: 1.2fr 0.95fr;
      gap: 24px;
      align-items: stretch;
    }

    .card {
      background: var(--panel);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(217,224,236,0.85);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 28px;
    }

    .card h2 {
      margin: 0 0 14px;
      font-size: 1.35rem;
      letter-spacing: -0.02em;
    }

    .card p {
      margin: 0;
      color: #33415c;
    }

    .gallery {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }

    .figure {
      background: var(--panel-strong);
      border: 1px solid var(--line);
      border-radius: 18px;
      padding: 14px;
      text-align: center;
    }

    .figure img {
      width: 100%;
      height: auto;
      max-height: 320px;
      object-fit: contain;
      border-radius: 12px;
      background: linear-gradient(180deg, #fafcff, #f4f7fc);
    }

    .caption {
      margin-top: 10px;
      font-size: 0.93rem;
      color: var(--muted);
    }

    .formula-card {
      margin-top: 24px;
    }

    .math-box {
      margin-top: 16px;
      padding: 18px 18px 8px;
      border-radius: 18px;
      background: linear-gradient(180deg, #fbfcff, #f5f8fe);
      border: 1px solid var(--line);
      overflow-x: auto;
    }

    .math-box p {
      margin: 0 0 8px;
      color: var(--muted);
      font-size: 0.95rem;
    }

    .features {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
      margin-top: 18px;
    }

    .feature {
      padding: 18px 18px 16px;
      border-radius: 18px;
      background: white;
      border: 1px solid var(--line);
    }

    .feature h3 {
      margin: 0 0 8px;
      font-size: 1rem;
    }

    .feature p {
      margin: 0;
      font-size: 0.96rem;
      color: var(--muted);
    }

    footer {
      padding: 28px 0 46px;
      color: var(--muted);
      font-size: 0.95rem;
      text-align: center;
    }

    @media (max-width: 960px) {
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .features {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 700px) {
      .hero-inner {
        padding: 36px 22px 26px;
      }
      .card {
        padding: 22px;
      }
      .gallery {
        grid-template-columns: 1fr;
      }
      .authors {
        font-size: 1rem;
      }
      .button {
        width: 100%;
      }
    }