/* ===== CSS Variables ===== */
  :root {
    --color-primary: #27b2ea;
    --color-primary-dark: #0090d1;
    --color-primary-light: #5cc6ef;
    --color-ink: #1b2f48;
    --color-text: #33414f;
    --color-text-secondary: #64748b;
    --color-bg: #ffffff;
    --color-bg-secondary: #f4f9fc;
    --color-border: #e3edf3;
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --shadow-sm: 0 1px 2px rgba(27,47,72,.05);
    --shadow-md: 0 6px 16px -4px rgba(27,47,72,.12);
    --shadow-lg: 0 18px 40px -10px rgba(27,47,72,.18);
    --radius-md: .5rem;
    --radius-lg: .75rem;
    --radius-xl: 1rem;
  }

  /* ===== Reset ===== */
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
  }
  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }

  .container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

  /* ===== Button ===== */
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
    padding: .55rem 1.15rem; border-radius: var(--radius-md);
    font-weight: 600; font-size: .9rem; cursor: pointer;
    transition: all .2s ease; font-family: var(--font-sans); border: none;
  }
  .btn-info { background: var(--color-primary); color: #fff; }
  .btn-info:hover { background: var(--color-primary-dark); }
  .btn-success { background: #22c55e; color: #fff; }
  .btn-success:hover { filter: brightness(1.05); }

  /* ===== Navbar ===== */
  .navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
  }
  .nav-inner {
    max-width: 1200px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    padding: .85rem 1.5rem; position: relative;
  }
  .nav-logo img { height: 38px; display: block; }
  .nav-menu { display: flex; align-items: center; gap: 1.75rem; }
  .nav-links { display: flex; gap: 1.75rem; list-style: none; align-items: center; }
  .nav-links a { color: var(--color-text); font-weight: 500; font-size: .95rem; transition: color .2s; }
  .nav-links a:hover, .nav-links a.active { color: var(--color-primary-dark); }
  .nav-actions { display: flex; gap: .75rem; align-items: center; }
  .menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: .5rem; }
  .menu-toggle span { display: block; width: 24px; height: 2px; background: var(--color-ink); margin: 5px 0; transition: .3s; }

  /* ===== Hero (Banner) ===== */
  .hero {
    position: relative;
    background: url(../images/mjw_02.webp) no-repeat center center / cover;
    padding: 7rem 0 5rem;
  }
  .hero .container { position: relative; z-index: 1; }
  .hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: end; min-height: 300px; }
  .hero-panel {
    grid-column: 2; justify-self: end;
    width: 100%; max-width: 480px;
    background: rgba(255,255,255,.88);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2rem 2.25rem;
    box-shadow: var(--shadow-lg);
    text-align: center;
  }
  .hero-panel h1 { font-size: clamp(1.6rem, 3.2vw, 2.1rem); font-weight: 800; color: var(--color-primary-dark); line-height: 1.15; margin-bottom: .25rem; }
  .hero-subtitle { font-size: 1.1rem; color: var(--color-text-secondary); font-weight: 500; margin-bottom: 1.5rem; letter-spacing: .15em; }
  .hero-points { list-style: none; margin: 0 auto 1.75rem; display: inline-block; text-align: left; }
  .hero-points li { position: relative; padding-left: 1.6rem; margin: .6rem 0; color: var(--color-text); font-size: 1.05rem; }
  .hero-points li::before { content: "✓"; position: absolute; left: 0; color: var(--color-primary); font-weight: 700; }
  .hero-download { margin-top: 1.25rem; }
  .hero-download img { height: 56px; margin: 0 auto; }

  /* ===== Section ===== */
  .section { padding: 5rem 0; }
  .section-head { text-align: center; max-width: 640px; margin: 0 auto 3rem; }
  .section-head h2 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); font-weight: 800; color: var(--color-ink); margin-bottom: .6rem; }
  .section-head p { color: var(--color-text-secondary); font-size: 1.05rem; }

  /* ===== Features ===== */
  .features { background: var(--color-bg-secondary); }
  .cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
  .card {
    background: #fff; border: 1px solid var(--color-border);
    border-radius: var(--radius-xl); padding: 2rem 1.5rem; text-align: center;
    transition: all .3s cubic-bezier(.4, 0, .2, 1);
  }
  .card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
  .card img { height: 60px; margin: 0 auto 1.1rem; }
  .card h3 { color: var(--color-ink); font-size: 1.15rem; margin-bottom: .6rem; font-weight: 700; }
  .card p { color: var(--color-text-secondary); font-size: .92rem; line-height: 1.7; }

  /* ===== Download CTA ===== */
  .download {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    text-align: center; color: #fff;
  }
  .download h2 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); font-weight: 800; margin-bottom: .5rem; }
  .download p { font-size: 1.05rem; color: rgba(255,255,255,.9); margin-bottom: 1.75rem; }
  .download img { height: 56px; margin: 0 auto; }

  /* ===== Notice ===== */
  .notice-box {
    max-width: 920px; margin: 0 auto; background: #eef7fc;
    border: 1px solid #c5e6f6; border-radius: var(--radius-lg);
    padding: 1.1rem 1.5rem; color: var(--color-ink); font-size: .95rem; line-height: 1.7;
  }

  /* ===== Footer ===== */
  .footer { background: var(--color-ink); color: #aeb9c7; padding: 3.5rem 0 1.5rem; }
  .footer-inner { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
  .footer-title { color: #fff; text-align: center; font-size: 1.4rem; font-weight: 700; margin-bottom: 2rem; }
  .footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; max-width: 760px; margin: 0 auto 2.5rem; }
  .footer-col { text-align: center; }
  .footer-label { display: block; color: #7d93a8; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: .5rem; }
  .footer-col a, .footer-col span { color: #cdd7e3; font-size: 1rem; }
  .footer-col a:hover { color: var(--color-primary-light); }
  .footer-links { text-align: center; margin: 0 auto 2.5rem; }
  .footer-links .footer-label { display: inline; margin: 0 .6rem 0 0; }
  .footer-links a { color: #cdd7e3; font-size: 1rem; margin: 0 .6rem; }
  .footer-links a:hover { color: var(--color-primary-light); }
  .footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-top: 1.5rem; text-align: center; font-size: .82rem; color: #6f8597; }
  .footer-bottom a { color: #9fb4c9; }

  /* ===== Responsive ===== */
  @media (max-width: 900px) {
    .cards { grid-template-columns: repeat(2, 1fr); }
    .hero-grid { grid-template-columns: 1fr; min-height: auto; }
    .hero-panel { grid-column: 1; justify-self: stretch; max-width: 520px; margin: 0 auto; }
  }
  @media (max-width: 768px) {
    .nav-menu { display: none; }
    .nav-menu.mobile-open {
      display: flex; flex-direction: column; align-items: flex-start; gap: 1rem;
      position: absolute; top: 100%; left: 0; right: 0;
      background: #fff; padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--color-border);
    }
    .nav-links { flex-direction: column; gap: 1rem; width: 100%; }
    .nav-actions { width: 100%; }
    .menu-toggle { display: block; }
    .hero { padding: 5rem 0 3rem; text-align: center; }
    .hero-points { display: inline-block; text-align: left; }
  }
  @media (max-width: 520px) {
    .cards { grid-template-columns: 1fr; }
    .footer-cols { grid-template-columns: 1fr; gap: 1.5rem; }
  }