:root{
 --theme:#00aae7;--theme-dark:#08749b;--theme-deep:#03435c;--theme-light:#f0fbff;--theme-soft:#d9f4ff;--theme-accent:#5fd5ff;--theme-hover:#0091c6;--theme-border:rgba(0,170,231,.35);--header-bg:#03435c;--header-bg-2:#075b79;--text-main:#173744;--text-muted:#5d7580;--on-theme:#032a38;--on-header:#f4fbff;--on-dark:#f4fbff;--white:#ffffff;--shadow-soft:0 16px 38px rgba(3,67,92,.18);
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,"Helvetica Neue",sans-serif;color:var(--text-main);background:var(--theme-light);line-height:1.75}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}.site-header{position:sticky;top:0;z-index:9999;background:linear-gradient(180deg,var(--header-bg) 0%,var(--header-bg-2) 100%);color:var(--on-header);box-shadow:var(--shadow-soft);border-bottom:1px solid var(--theme-border)}.header-inner{width:min(1220px,calc(100% - 32px));min-height:82px;margin:auto;display:grid;grid-template-columns:190px 1fr auto;align-items:center;gap:24px}.site-logo img{max-width:190px;max-height:72px;width:auto;height:auto;object-fit:contain;display:block}.desktop-nav{display:flex;justify-content:center;gap:18px;white-space:nowrap;font-weight:700;font-size:14px}.desktop-nav a{padding:26px 0 20px;border-bottom:3px solid transparent}.desktop-nav a:hover,.desktop-nav a.active{color:#f4fbff;border-bottom-color:var(--theme-accent)}.header-login,.main-btn{display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(180deg,var(--theme-accent) 0%,var(--theme) 48%,var(--theme-dark) 100%);color:var(--on-theme);font-weight:800;border-radius:999px;padding:11px 18px;box-shadow:0 12px 26px rgba(0,0,0,.16)}.header-login:hover,.main-btn:hover{background:var(--theme-hover)}.mobile-menu-toggle{display:none;background:none;border:0;color:var(--on-header);font-size:28px}.section{padding:64px 0}.section-inner,.hero-inner{width:min(1220px,calc(100% - 32px));margin:auto}.hero-section{background:linear-gradient(135deg,#effaff 0%,var(--theme-light) 52%,#c9efff 100%);padding:58px 0}.hero-inner{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.95fr);align-items:center;gap:56px;min-height:560px}.hero-badge,.eyebrow{display:inline-block;background:var(--theme-soft);border:1px solid var(--theme-border);color:var(--theme-dark);font-weight:800;border-radius:999px;padding:7px 14px}.hero-content h1{font-size:clamp(42px,4.2vw,64px);line-height:1.08;letter-spacing:-.03em;margin:18px 0 22px;color:var(--theme-dark)}.hero-content p{max-width:760px;font-size:18px;line-height:1.8}.hero-tags,.category-pills,.related-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.hero-tags span,.category-pills a,.related-links a{background:var(--theme-soft);border:1px solid var(--theme-border);border-radius:999px;padding:9px 14px;color:var(--theme-dark);font-weight:700}.category-pills a:hover,.related-links a:hover{background:var(--theme);color:var(--on-theme)}.hero-media-box{width:min(100%,540px);min-height:320px;max-height:420px;padding:34px;display:flex;align-items:center;justify-content:center;overflow:visible;background:rgba(255,255,255,.72);border:1px solid var(--theme-border);border-radius:28px;box-shadow:var(--shadow-soft)}.hero-media-box img{max-width:100%;max-height:340px;width:auto;height:auto;object-fit:contain;opacity:1}.info-grid,.category-grid,.service-grid,.topic-grid,.faq-grid,.feedback-grid{display:grid;gap:22px}.info-grid{grid-template-columns:repeat(4,1fr)}.category-grid{grid-template-columns:repeat(4,1fr)}.service-grid{grid-template-columns:repeat(3,1fr)}.topic-grid{grid-template-columns:repeat(3,1fr)}.feedback-grid,.faq-grid{grid-template-columns:repeat(2,1fr)}.info-card,.category-card,.service-card,.topic-card,.faq-item,.feedback-card,.notice-box,.content-card{background:var(--white);border:1px solid var(--theme-border);border-radius:20px;padding:24px;box-shadow:var(--shadow-soft)}.info-card span{display:inline-flex;width:42px;height:42px;border-radius:14px;align-items:center;justify-content:center;background:var(--theme);color:var(--on-theme);font-weight:900}.info-card h2,.category-card h3,.service-card h3,.topic-card h3,.faq-item h3,.feedback-card h3{color:var(--theme-dark)}.section-title{font-size:clamp(30px,3vw,44px);line-height:1.2;color:var(--theme-dark);margin:0 0 14px}.section-lead{max-width:840px;color:var(--text-muted);font-size:17px}.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}.media-box,.app-visual,.card-media{display:flex;align-items:center;justify-content:center;overflow:visible;background:var(--theme-soft);border:1px solid var(--theme-border);border-radius:24px;padding:24px;min-height:280px}.media-box img,.app-visual img,.card-media img{max-width:100%;max-height:360px;width:auto;height:auto;object-fit:contain}.alt-bg{background:#eaf8ff}.notice-box{background:var(--theme-soft);border-left:5px solid var(--theme)}.page-hero{padding:52px 0 28px;background:linear-gradient(135deg,var(--theme-soft),var(--theme-light))}.page-hero .split{grid-template-columns:1.1fr .9fr}.page-hero h1{font-size:clamp(38px,4vw,58px);line-height:1.1;color:var(--theme-dark);margin:16px 0}.bullet-list{display:grid;gap:12px;padding:0;list-style:none}.bullet-list li{background:var(--white);border:1px solid var(--theme-border);border-left:4px solid var(--theme);border-radius:14px;padding:13px 16px}.site-footer{background:var(--theme-deep);color:var(--on-dark);padding:48px 0}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px}.site-footer h2{font-size:18px}.site-footer a{display:block;margin:8px 0}.footer-logo{max-width:180px;max-height:64px;object-fit:contain}.mobile-drawer,.drawer-overlay{display:none}
@media(max-width:1000px){.desktop-nav{display:none}.header-inner{grid-template-columns:auto 1fr auto}.mobile-menu-toggle{display:block}.site-logo{justify-self:center}.site-logo img{max-width:150px}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(86vw,330px);background:var(--header-bg);color:var(--on-header);z-index:10001;transform:translateX(-105%);transition:.25s;padding:18px}.mobile-drawer.is-open{transform:translateX(0)}.mobile-drawer nav a{display:block;padding:12px 4px;border-bottom:1px solid rgba(255,255,255,.15)}.drawer-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.drawer-top img{max-width:150px;max-height:62px;object-fit:contain}.drawer-close{background:none;border:0;color:var(--on-header);font-size:32px}.drawer-overlay{display:block;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:10000;opacity:0;pointer-events:none;transition:.25s}.drawer-overlay.is-open{opacity:1;pointer-events:auto}.hero-inner,.split,.page-hero .split{grid-template-columns:1fr}.hero-inner{min-height:0}.hero-visual{display:flex;justify-content:center}.info-grid,.category-grid{grid-template-columns:repeat(2,1fr)}.service-grid,.topic-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.header-inner{width:min(100% - 18px,1220px);min-height:68px;gap:8px}.site-logo img{max-width:110px;max-height:50px}.header-login{padding:9px 12px;font-size:12px}.hero-section{padding:38px 0}.section{padding:46px 0}.hero-content h1{font-size:clamp(34px,10vw,46px)}.hero-content p{font-size:16px}.hero-media-box{min-height:240px;padding:22px}.info-grid,.category-grid,.service-grid,.topic-grid,.faq-grid,.feedback-grid,.footer-grid{grid-template-columns:1fr}.section-inner,.hero-inner{width:min(100% - 22px,1220px)}body{overflow-x:hidden}}

body.menu-open{overflow:hidden}

/* CHATGPT_MOBILE_HEADER_V4_START */
@media (max-width: 767px) {
  html, body {
    width: 100% !important;
    max-width: 100% !important;
    overflow-x: hidden !important;
  }

  .site-header {
    width: 100% !important;
    max-width: 100% !important;
    overflow: visible !important;
  }

  .header-inner {
    display: flex !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    min-height: 64px !important;
    margin: 0 !important;
    padding: 0 10px !important;
    gap: 8px !important;
    box-sizing: border-box !important;
    align-items: center !important;
    justify-content: space-between !important;
  }

  /* Stable hamburger: do not rely on three flex children. */
  .mobile-menu-toggle {
    display: flex !important;
    position: relative !important;
    flex: 0 0 40px !important;
    width: 40px !important;
    min-width: 40px !important;
    max-width: 40px !important;
    height: 40px !important;
    min-height: 40px !important;
    max-height: 40px !important;
    margin: 0 !important;
    padding: 0 !important;
    box-sizing: border-box !important;
    align-items: center !important;
    justify-content: center !important;
    color: var(--on-header, #fff) !important;
    opacity: 1 !important;
    visibility: visible !important;
  }

  .mobile-menu-toggle span {
    display: none !important;
  }

  .mobile-menu-toggle::before {
    content: "" !important;
    display: block !important;
    position: absolute !important;
    left: 50% !important;
    top: 50% !important;
    width: 20px !important;
    height: 2px !important;
    margin-left: -10px !important;
    margin-top: -1px !important;
    border-radius: 2px !important;
    background: currentColor !important;
    box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
  }

  .site-logo {
    display: flex !important;
    flex: 1 1 auto !important;
    width: auto !important;
    min-width: 0 !important;
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
    align-items: center !important;
    justify-content: center !important;
    overflow: hidden !important;
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    border-radius: 0 !important;
  }

  .site-logo img {
    display: block !important;
    width: auto !important;
    height: auto !important;
    max-width: min(112px, 100%) !important;
    max-height: 44px !important;
    margin: 0 auto !important;
    padding: 0 !important;
    object-fit: contain !important;
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    border-radius: 0 !important;
  }

  .header-actions {
    display: flex !important;
    flex: 0 0 auto !important;
    min-width: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    justify-content: flex-end !important;
  }

  .header-login,
  .header-actions .main-btn {
    display: inline-flex !important;
    flex: 0 0 92px !important;
    width: 92px !important;
    min-width: 92px !important;
    max-width: 92px !important;
    min-height: 38px !important;
    padding: 8px 4px !important;
    margin: 0 !important;
    box-sizing: border-box !important;
    align-items: center !important;
    justify-content: center !important;
    white-space: nowrap !important;
    overflow: visible !important;
    text-overflow: clip !important;
    font-size: 10px !important;
    line-height: 1 !important;
    letter-spacing: 0 !important;
  }

  .drawer-logo,
  .footer-logo {
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    border-radius: 0 !important;
  }

  .drawer-logo img,
  .footer-logo img {
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    border-radius: 0 !important;
  }
}

@media (max-width: 359px) {
  .header-inner {
    padding-left: 6px !important;
    padding-right: 6px !important;
    gap: 5px !important;
  }

  .mobile-menu-toggle {
    flex-basis: 38px !important;
    width: 38px !important;
    min-width: 38px !important;
    max-width: 38px !important;
    height: 38px !important;
  }

  .site-logo img {
    max-width: min(102px, 100%) !important;
  }

  .header-login,
  .header-actions .main-btn {
    flex-basis: 84px !important;
    width: 84px !important;
    min-width: 84px !important;
    max-width: 84px !important;
    font-size: 9.5px !important;
  }
}
/* CHATGPT_MOBILE_HEADER_V4_END */