:root {
      --bg: #050816;
      --card: rgba(255,255,255,0.06);
      --card-border: rgba(255,255,255,0.08);

      --text: #f4f6ff;
      --muted: rgba(244,246,255,0.72);

      --accent: #3a6dff;
      --yellow: #ffd25c;

      --max-width: 1120px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      background:
        radial-gradient(circle at top right,
          rgba(255, 90, 90, 0.16),
          transparent 32%),
        radial-gradient(circle at top left,
          rgba(58,109,255,0.18),
          transparent 34%),
        var(--bg);

      color: var(--text);

      font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Apple SD Gothic Neo",
        "Noto Sans KR",
        "Segoe UI",
        sans-serif;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    header {
      padding: 28px 0;
    }

    .topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .brand {
      font-size: 15px;
      font-weight: 700;
      letter-spacing: 0.08em;
      color: var(--yellow);
    }

    .back-link {
      color: var(--muted);
      font-size: 14px;
      transition: opacity 0.2s ease;
    }

    .back-link:hover {
      opacity: 0.7;
    }

    .hero {
      padding:
        72px
        0
        88px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }

    .eyebrow {
      color: var(--yellow);
      font-size: 14px;
      font-weight: 800;
      letter-spacing: 0.12em;
      margin-bottom: 18px;
    }

    h1 {
      margin: 0;

      font-size: clamp(52px, 8vw, 104px);
      line-height: 0.92;
      letter-spacing: -0.07em;
    }

    .hero-subtitle {
      margin-top: 28px;

      color: var(--muted);

      font-size: 24px;
      line-height: 1.45;
      letter-spacing: -0.03em;

      max-width: 620px;
    }

    .hero-copy {
      margin-top: 28px;

      color: var(--muted);

      font-size: 17px;
      line-height: 1.8;

      max-width: 620px;
    }

    .hero-note {
      margin-top: 12px;
      padding-top: 8px;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.6;
      max-width: 620px;
    }

    .hero-actions {
      margin-top: 42px;
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      margin-bottom: 4px;
    }

    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;

      height: 54px;
      padding: 0 24px;

      border-radius: 18px;

      font-size: 16px;
      font-weight: 700;

      transition:
        transform 0.18s ease,
        opacity 0.18s ease,
        background 0.18s ease;
    }

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

    .button-primary {
      background: var(--accent);
      color: white;
    }

    .button-secondary {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.08);
      color: var(--text);
    }

    .phone {
      position: relative;

      width: 100%;
      max-width: 380px;

      margin: 0 auto;

      border-radius: 42px;

      overflow: hidden;

      background: #dcefe8;

      border: 1px solid rgba(255,255,255,0.08);

      box-shadow:
        0 40px 80px rgba(0,0,0,0.42),
        0 0 0 1px rgba(255,255,255,0.03) inset;
    }

    .phone img {
      display: block;
      width: 100%;
      height: auto;
    }

    section {
      padding: 40px 0 88px;
    }

    .section-label {
      color: var(--yellow);
      font-size: 14px;
      font-weight: 800;
      letter-spacing: 0.12em;
      margin-bottom: 18px;
    }

    .section-title {
      margin: 0;

      font-size: clamp(36px, 5vw, 64px);
      line-height: 1.04;
      letter-spacing: -0.06em;
    }

    .section-copy {
      margin-top: 18px;

      color: var(--muted);

      font-size: 18px;
      line-height: 1.75;

      max-width: 760px;
    }

    .feature-grid {
      margin-top: 42px;

      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 22px;
    }

    .feature-card {
      background: var(--card);
      border: 1px solid var(--card-border);

      border-radius: 28px;

      padding: 28px;

      backdrop-filter: blur(12px);
    }

    .feature-icon {
      font-size: 30px;
      margin-bottom: 18px;
    }

    .feature-title {
      font-size: 24px;
      font-weight: 800;
      letter-spacing: -0.04em;
    }

    .feature-copy {
      margin-top: 12px;

      color: var(--muted);

      font-size: 16px;
      line-height: 1.7;
    }

    .privacy-box {
      margin-top: 40px;

      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);

      border-radius: 28px;

      padding: 32px;
    }

    .privacy-title {
      font-size: 22px;
      font-weight: 800;
      letter-spacing: -0.04em;
    }

    .privacy-copy {
      margin-top: 12px;

      color: var(--muted);

      line-height: 1.8;
    }

    footer {
      padding:
        40px
        0
        72px;
    }

    .footer-line {
      height: 1px;
      background: rgba(255,255,255,0.08);
      margin-bottom: 32px;
    }

    .footer-content {
      display: flex;
      justify-content: space-between;
      gap: 18px;
      flex-wrap: wrap;

      color: var(--muted);

      font-size: 14px;
    }

    .footer-links {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .footer-links a:hover {
      color: white;
    }

    @media (max-width: 900px) {

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

      .phone {
        max-width: 340px;
      }

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

      .hero {
        padding-top: 36px;
      }

      .section-copy,
      .hero-copy,
      .hero-subtitle {
        font-size: 16px;
      }
    }