:root {
    --bg-top: #131a2b;
    --bg-bottom: #01040a;
    --bg-card: #0b1220;
    --fg: #eef4fb;
    --fg-muted: #7e8ba3;
    --border: #1d2a3f;
    --accent: #38bdf8;
    --accent-2: #6ee7ff;
    --accent-soft: rgba(56, 189, 248, 0.12);
    --accent-gradient: linear-gradient(90deg, #6ee7ff 0%, #38bdf8 55%, #2563eb 100%);
    --mono: "SF Mono", "Menlo", "Consolas", monospace;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", sans-serif;
    background: radial-gradient(ellipse 90% 60% at 50% 0%, var(--bg-top) 0%, var(--bg-bottom) 60%);
    background-attachment: fixed;
    background-color: var(--bg-bottom);
    color: var(--fg);
    line-height: 1.75;
  }

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

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

  .container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
  }

  /* Header */
  header.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(1, 4, 10, 0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
  }

  .nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    max-width: 1080px;
    margin: 0 auto;
  }

  .nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.12em;
  }

  .nav-logo img {
    width: 26px;
    height: 26px;
    border-radius: 7px;
  }

  .nav-brand {
    color: var(--fg-muted);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    font-family: var(--mono);
  }

  .nav-brand:hover {
    color: var(--accent);
  }

  .nav-sep {
    color: var(--fg-muted);
    opacity: 0.5;
    font-weight: 400;
  }

  .nav-cta {
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 9px 20px;
    border-radius: 999px;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    transition: background 0.2s ease, color 0.2s ease;
  }

  .nav-cta:hover {
    background: var(--accent);
    color: #01131c;
  }

  .nav-right {
    display: flex;
    align-items: center;
    gap: 18px;
  }

  .nav-link {
    color: var(--fg-muted);
    font-size: 0.85rem;
    letter-spacing: 0.02em;
  }

  .nav-link:hover {
    color: var(--fg);
  }

  @media (max-width: 640px) {
    .nav-link { display: none; }
  }

  .lang-toggle {
    display: inline-block;
    border: 1px solid var(--border);
    color: var(--fg-muted);
    background: transparent;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 0.78rem;
    letter-spacing: 0.05em;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: border-color 0.2s ease, color 0.2s ease;
  }

  .lang-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
  }

  /* Hero */
  .hero {
    padding: 88px 0 56px;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: "";
    position: absolute;
    top: -260px;
    left: 50%;
    transform: translateX(-50%);
    width: 900px;
    height: 900px;
    border-radius: 50%;
    border: 1px solid rgba(56, 189, 248, 0.18);
    box-shadow: 0 0 0 60px rgba(56, 189, 248, 0.02), 0 0 0 140px rgba(56, 189, 248, 0.015);
    pointer-events: none;
  }

  .hero-lockup {
    display: flex;
    align-items: center;
    gap: 28px;
    margin-bottom: 48px;
    position: relative;
  }

  .hero-lockup img {
    width: clamp(72px, 10vw, 108px);
    height: auto;
    flex-shrink: 0;
  }

  .hero h1 {
    font-size: clamp(2rem, 5.6vw, 3.4rem);
    font-weight: 700;
    letter-spacing: 0.04em;
    margin-bottom: 8px;
  }

  .hero .tagline {
    font-size: clamp(1rem, 2.2vw, 1.3rem);
    font-weight: 600;
    letter-spacing: 0.01em;
    background: var(--accent-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--accent);
    display: inline-block;
    font-family: var(--mono);
  }

  @media (max-width: 560px) {
    .hero-lockup {
      flex-direction: column;
      align-items: flex-start;
      gap: 20px;
    }
  }

  .btn {
    display: inline-block;
    padding: 14px 30px;
    border-radius: 8px;
    font-size: 0.92rem;
    letter-spacing: 0.03em;
    font-weight: 600;
    transition: transform 0.15s ease, opacity 0.15s ease;
  }

  .btn:hover {
    transform: translateY(-2px);
  }

  .btn-primary {
    background: var(--accent-gradient);
    color: #01131c;
  }

  .btn-outline {
    border: 1px solid var(--border);
    color: var(--fg);
  }

  .hero-cta {
    margin-bottom: 40px;
    position: relative;
  }

  .hero-cta .btn {
    margin-bottom: 12px;
  }

  .hero-cta-note {
    color: var(--fg-muted);
    font-size: 0.82rem;
    letter-spacing: 0.02em;
    font-family: var(--mono);
  }

  .hero-visual {
    position: relative;
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    background: var(--bg-card);
    box-shadow: 0 40px 80px -40px rgba(0, 0, 0, 0.7), 0 0 60px -20px rgba(56, 189, 248, 0.15);
  }

  .hero-visual img {
    width: 100%;
    height: auto;
  }

  /* Spec strip */
  .spec-strip {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  .spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
  }

  .spec-item {
    text-align: center;
  }

  .spec-item .spec-value {
    font-family: var(--mono);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 6px;
  }

  .spec-item .spec-label {
    font-size: 0.72rem;
    color: var(--fg-muted);
    letter-spacing: 0.04em;
  }

  /* Section titles */
  .section {
    padding: 88px 0;
    border-top: 1px solid var(--border);
  }

  .section-head {
    text-align: center;
    max-width: 620px;
    margin: 0 auto 56px;
  }

  .section-eyebrow {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--accent);
    margin-bottom: 12px;
    font-family: var(--mono);
  }

  .section-head h2 {
    font-size: clamp(1.5rem, 3.2vw, 2.1rem);
    font-weight: 700;
    margin-bottom: 12px;
  }

  .section-head p {
    color: var(--fg-muted);
    font-size: 0.96rem;
  }

  /* Feature cards */
  .feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
  }

  .feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 30px 28px;
    transition: border-color 0.2s ease;
  }

  .feature-card:hover {
    border-color: var(--accent);
  }

  .feature-card-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-gradient);
    margin-bottom: 16px;
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.7);
  }

  .feature-card-eyebrow {
    font-size: 0.7rem;
    letter-spacing: 0.16em;
    color: var(--accent);
    margin-bottom: 10px;
    font-family: var(--mono);
  }

  .feature-card h3 {
    font-size: 1.08rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.5;
  }

  .feature-card p {
    color: var(--fg-muted);
    font-size: 0.9rem;
  }

  /* Pricing */
  .pricing-wrap {
    max-width: 420px;
    margin: 0 auto;
  }

  .price-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--accent);
    border-radius: 16px;
    padding: 40px 36px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    text-align: center;
    box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.4), 0 30px 60px -30px rgba(56, 189, 248, 0.25);
  }

  .price-card .plan-label {
    font-size: 0.78rem;
    color: var(--fg-muted);
    letter-spacing: 0.08em;
    font-family: var(--mono);
  }

  .price-card .plan-name {
    font-size: 1.1rem;
    font-weight: 700;
  }

  .price-card .plan-price {
    font-size: 2.6rem;
    font-weight: 700;
    margin: 10px 0;
    color: var(--accent);
    font-family: var(--mono);
  }

  .price-card .plan-note {
    color: var(--fg-muted);
    font-size: 0.85rem;
    margin-bottom: 10px;
  }

  .pricing-note {
    text-align: center;
    color: var(--fg-muted);
    font-size: 0.8rem;
    margin-top: 24px;
  }

  /* Requirements */
  .req-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    max-width: 720px;
    margin: 0 auto;
  }

  .req-box {
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 32px 24px;
  }

  .req-box .req-label {
    font-size: 0.78rem;
    color: var(--accent);
    letter-spacing: 0.15em;
    margin-bottom: 10px;
    font-family: var(--mono);
  }

  .req-box .req-value {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
  }

  .req-box .req-sub {
    color: var(--fg-muted);
    font-size: 0.85rem;
  }

  /* Contact */
  .contact-notice {
    max-width: 560px;
    margin: 0 auto 28px;
    padding: 14px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    text-align: center;
  }

  .contact-notice.success {
    background: var(--accent-soft);
    border: 1px solid var(--accent);
    color: var(--fg);
  }

  .contact-notice.error {
    background: rgba(220, 80, 60, 0.12);
    border: 1px solid rgba(220, 80, 60, 0.4);
    color: #ffb3a7;
  }

  .contact-form {
    max-width: 560px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
  }

  .form-row label {
    display: block;
    font-size: 0.85rem;
    color: var(--fg-muted);
    margin-bottom: 8px;
  }

  .form-row input,
  .form-row textarea {
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--fg);
    font-size: 0.95rem;
    font-family: inherit;
    resize: vertical;
  }

  .form-row input:focus,
  .form-row textarea:focus {
    outline: none;
    border-color: var(--accent);
  }

  .contact-form .btn {
    align-self: flex-start;
  }

  /* Footer */
  footer.site-footer {
    border-top: 1px solid var(--border);
    padding: 32px 0;
    text-align: center;
    color: var(--fg-muted);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 12px;
  }

  .footer-links a {
    color: var(--fg-muted);
  }

  .footer-links a:hover {
    color: var(--accent);
  }

  @media (max-width: 640px) {
    .hero { padding: 64px 0 40px; }
    .section { padding: 64px 0; }
  }