:root{--theme:#c44700;--theme-dark:#993700;--theme-deep:#5b2100;--theme-light:#fff6f0;--theme-soft:#f8dfd2;--theme-accent:#cc4a00;--theme-hover:#a53c00;--theme-border:rgba(196,71,0,.30);--header-bg:#7f2e00;--header-bg-2:#4e1c00;--text-main:#3d271d;--text-muted:#76584a;--on-theme:#ffffff;--on-header:#ffffff;--on-dark:#ffffff;--white:#ffffff;--shadow-soft:0 18px 48px rgba(91,33,0,.20);}
*{box-sizing:border-box}html{scroll-behavior:smooth}html,body{margin:0;min-height:100%;overflow-x:hidden;overflow-y:auto}body{background:var(--theme-light);color:var(--text-main);font-family:Arial,Helvetica,sans-serif;line-height:1.72}img{max-width:100%}a{color:var(--theme-dark)}button,input,textarea{font:inherit}.container,.section-inner,.header-inner,.footer-inner,.hero-inner{width:min(1280px,calc(100% - 80px));margin-left:auto;margin-right:auto}.section{padding:72px 0}.section.alt{background:var(--theme-soft)}.section.white{background:var(--white)}.section-head{max-width:840px;margin-bottom:34px}.section-kicker,.page-badge,.hero-badge{display:inline-flex;align-items:center;border-radius:999px;padding:8px 14px;background:var(--theme-soft);color:var(--theme-dark);border:1px solid var(--theme-border);font-weight:800}h1,h2,h3{color:var(--theme-dark);line-height:1.18}h2{font-size:clamp(30px,3vw,44px);margin:0 0 18px}h3{font-size:22px;margin:0 0 10px}p{margin-top:0}.site-header{position:sticky;top:0;width:100%;z-index:9999;background:linear-gradient(180deg,var(--header-bg),var(--header-bg-2));color:var(--on-header);box-shadow:var(--shadow-soft);border-bottom:1px solid var(--theme-border);overflow:visible}.header-inner{min-height:82px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:22px;overflow:visible}.site-logo{display:inline-flex;align-items:center;justify-content:center;overflow:visible}.site-logo img{display:block;width:auto;height:auto;max-width:190px;max-height:72px;object-fit:contain}.main-nav{display:flex;justify-content:center;align-items:center;gap:14px}.main-nav a{color:var(--on-header);text-decoration:none;white-space:nowrap;padding:28px 0 23px;border-bottom:3px solid transparent;font-weight:700;font-size:13px}.main-nav a.active,.main-nav a:hover{color:var(--on-header);border-bottom-color:var(--theme-accent)}.main-btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 22px;background:linear-gradient(180deg,var(--theme-accent) 0%,var(--theme) 58%,var(--theme-hover) 100%);color:var(--on-theme);border-radius:999px;box-shadow:0 14px 28px rgba(0,0,0,.16);text-decoration:none;white-space:nowrap;font-weight:900;border:1px solid rgba(255,255,255,.34)}.main-btn:hover{background:linear-gradient(180deg,var(--theme-hover),var(--theme));filter:brightness(1.04);transform:translateY(-1px)}.mobile-menu-toggle{display:none;border:0;background:transparent;padding:8px;align-items:center;justify-content:center;flex-direction:column;gap:5px}.mobile-menu-toggle span{width:25px;height:2px;background:var(--on-header);border-radius:99px}.mobile-drawer{position:fixed;top:0;left:0;width:82%;max-width:320px;height:100vh;transform:translateX(-100%);transition:transform .28s ease;z-index:10001;background:linear-gradient(180deg,var(--header-bg),var(--header-bg-2));color:var(--on-header);padding:20px;overflow-y:auto}.mobile-drawer.is-open{transform:translateX(0)}.drawer-overlay{position:fixed;inset:0;opacity:0;visibility:hidden;z-index:10000;background:rgba(78,28,0,.76);transition:.28s ease}.drawer-overlay.is-open{opacity:1;visibility:visible}body.menu-open{overflow:hidden}.drawer-head{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid rgba(255,255,255,.18);padding-bottom:16px}.drawer-head img{max-width:150px;max-height:58px;object-fit:contain}.drawer-close{border:0;background:var(--theme-accent);color:var(--on-theme);width:42px;height:42px;border-radius:50%;font-size:28px;line-height:1}.drawer-nav{display:grid;gap:5px;padding:18px 0}.drawer-nav a{color:var(--on-header);text-decoration:none;padding:11px 12px;border-radius:12px;font-weight:700}.drawer-nav a:hover{background:rgba(255,255,255,.13);color:var(--theme-soft)}.drawer-note{border:1px solid rgba(255,255,255,.18);border-radius:18px;padding:16px;background:rgba(255,255,255,.07)}.hero-section{padding:64px 0 44px;background:radial-gradient(circle at 15% 20%,var(--theme-soft) 0%,transparent 34%),linear-gradient(180deg,var(--theme-light),var(--white))}.hero-inner{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.95fr);align-items:center;gap:56px}.hero-content h1{font-size:clamp(42px,4.2vw,64px);line-height:1.08;letter-spacing:-.03em;margin:14px 0 22px;color:var(--theme-dark)}.hero-content p{max-width:760px;font-size:18px;line-height:1.82;margin-bottom:26px}.hero-tags{display:flex;flex-wrap:wrap;gap:12px}.hero-tags span,.tag{display:inline-flex;align-items:center;border-radius:999px;padding:9px 15px;background:var(--theme-soft);color:var(--theme-dark);border:1px solid var(--theme-border);font-weight:800}.hero-visual,.media-box,.app-visual,.card-media{display:flex;align-items:center;justify-content:center;overflow:visible}.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;border-radius:32px;background:linear-gradient(180deg,var(--white),var(--theme-soft));border:1px solid var(--theme-border);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-section{padding:28px 0 48px;background:var(--white)}.info-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}.info-card,.card,.zone-card,.feature-card,.category-card,.faq-item,.notice,.feedback-card,.step-card,.term-card{background:var(--white);color:var(--text-main);border:1px solid var(--theme-border);box-shadow:var(--shadow-soft);border-radius:24px;min-height:auto;height:auto;padding:26px}.info-card:before,.category-card:before,.feature-card:before,.term-card:before{content:"";display:block;width:52px;height:4px;border-radius:999px;background:linear-gradient(90deg,var(--theme),var(--theme-accent));margin-bottom:16px}.info-card span,.card-number{color:var(--theme-dark);font-weight:900;font-size:18px}.info-card h2{font-size:24px;margin:9px 0 12px}.info-card p,.card p,.term-card p,.step-card p,.feedback-card p{color:var(--text-muted)}.category-section{padding:30px 0;background:var(--theme-soft)}.category-pills{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}.category-pills a{background:var(--white);color:var(--theme-dark);border:1px solid var(--theme-border);border-radius:999px;padding:11px 18px;text-decoration:none;font-weight:800}.category-pills a:hover{background:linear-gradient(180deg,var(--theme-accent),var(--theme));color:var(--on-theme)}.category-grid,.feature-grid,.term-grid,.step-grid,.feedback-grid,.related-grid{display:grid;gap:22px}.category-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.feature-grid,.term-grid,.feedback-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.step-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.related-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.category-card a,.text-link,.related-grid a{font-weight:800;text-decoration:none}.split-section{display:grid;grid-template-columns:minmax(0,1fr) minmax(360px,.82fr);align-items:center;gap:54px}.split-section.reverse .media-column{order:-1}.media-column{min-height:360px;padding:28px;border:1px solid var(--theme-border);border-radius:30px;background:linear-gradient(180deg,var(--white),var(--theme-soft));box-shadow:var(--shadow-soft);display:flex;align-items:center;justify-content:center}.media-column img,.media-box img,.app-visual img,.card-media img{max-width:100%;max-height:330px;width:auto;height:auto;object-fit:contain}.check-list,.plain-list{margin:20px 0 0;padding:0;list-style:none;display:grid;gap:12px}.check-list li,.plain-list li{position:relative;padding-left:28px}.check-list li:before,.plain-list li:before{content:"✓";position:absolute;left:0;color:var(--theme-dark);font-weight:900}.page-hero{padding:58px 0 42px;background:linear-gradient(180deg,var(--theme-light),var(--white))}.page-hero-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(320px,.92fr);align-items:center;gap:50px}.page-hero h1{font-size:clamp(40px,4.3vw,62px);margin:14px 0 20px}.page-hero p{font-size:18px;line-height:1.85}.page-visual{min-height:320px;border-radius:30px;background:linear-gradient(180deg,var(--white),var(--theme-soft));border:1px solid var(--theme-border);box-shadow:var(--shadow-soft);display:flex;align-items:center;justify-content:center;padding:28px}.page-visual img{max-width:100%;max-height:300px;width:auto;height:auto;object-fit:contain}.visual-stat-grid{width:100%;display:grid;grid-template-columns:1fr 1fr;gap:14px}.visual-stat{border-radius:18px;background:var(--white);border:1px solid var(--theme-border);padding:18px}.visual-stat strong{color:var(--theme-dark);display:block;font-size:24px}.prose{font-size:17px}.faq-list{display:grid;gap:16px}.faq-item h3{margin:0 0 10px;font-size:20px}.notice{background:linear-gradient(180deg,var(--theme-soft),var(--white));border-left:6px solid var(--theme)}.notice h2{font-size:30px}.related-grid a{display:block;background:var(--white);border:1px solid var(--theme-border);border-radius:18px;padding:18px;box-shadow:var(--shadow-soft)}.footer{background:linear-gradient(180deg,var(--theme-dark),var(--theme-deep));color:var(--on-dark);padding-top:56px}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px}.footer h2{color:var(--theme-soft);font-size:20px}.footer a{display:block;color:var(--on-dark);text-decoration:none;padding:5px 0}.footer a:hover{color:var(--theme-soft)}.footer-brand img{max-width:200px;max-height:72px;object-fit:contain;margin-bottom:16px}.footer-brand p{color:rgba(255,255,255,.84)}.legal-box{margin-top:36px;padding:24px;border:1px solid rgba(255,255,255,.2);border-radius:22px;background:rgba(255,255,255,.07)}.footer-bottom{text-align:center;padding:22px 16px;margin-top:34px;border-top:1px solid rgba(255,255,255,.15);color:rgba(255,255,255,.76)}
@media(min-width:1440px){.container,.section-inner,.header-inner,.footer-inner,.hero-inner{width:min(1360px,calc(100% - 120px))}.hero-inner{grid-template-columns:minmax(0,1.05fr) minmax(480px,.95fr);gap:72px}}
@media(max-width:1180px){.main-nav{gap:10px}.main-nav a{font-size:12px}.category-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:1023px){.header-inner{width:min(100% - 28px,1280px);min-height:68px;grid-template-columns:48px minmax(0,1fr) auto;gap:10px}.mobile-menu-toggle{display:inline-flex;width:44px;height:44px}.main-nav{display:none}.site-logo{justify-self:center}.site-logo img{max-width:min(150px,42vw);max-height:56px}.header-actions{justify-self:end}.header-actions .main-btn{padding:10px 16px}.hero-section{padding:48px 0 36px}.hero-inner,.page-hero-grid,.split-section{grid-template-columns:1fr;gap:32px}.split-section.reverse .media-column{order:initial}.hero-content h1{font-size:clamp(36px,9vw,52px)}.hero-media-box{max-width:100%;min-height:auto;padding:24px}.hero-media-box img{max-height:300px}.info-grid,.feature-grid,.term-grid,.feedback-grid,.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:767px){.container,.section-inner,.header-inner,.footer-inner,.hero-inner{width:min(100% - 32px,1280px)}.section{padding:52px 0}.info-grid,.category-grid,.feature-grid,.term-grid,.step-grid,.feedback-grid,.related-grid,.footer-grid{grid-template-columns:1fr}.page-hero{padding:42px 0 30px}.page-visual,.media-column{min-height:260px}.visual-stat-grid{grid-template-columns:1fr}}
@media(max-width:390px){.header-inner{width:min(100% - 20px,1280px);grid-template-columns:44px minmax(0,1fr) auto;gap:8px}.site-logo img{max-width:min(120px,36vw);max-height:48px}.header-actions .main-btn{padding:8px 12px;font-size:13px}}

/* MOBILE_FIX_TYPE_A_20260930: restore mobile menu icon + narrow-screen hardening */
@media (max-width: 1023px) {
  html, body { width: 100%; max-width: 100%; overflow-x: clip; }
  .header-inner, .header-inner > *, .hero-inner > *, .page-hero-inner > *, .split > * { min-width: 0; }
  .mobile-menu-toggle {
    display: inline-flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 4px !important;
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
    padding: 8px !important;
    position: relative;
    z-index: 2;
    opacity: 1 !important;
    visibility: visible !important;
    color: var(--on-header, #fff) !important;
    -webkit-appearance: none;
    appearance: none;
  }
  .mobile-menu-toggle span {
    display: block !important;
    flex: 0 0 2px !important;
    width: 24px !important;
    height: 2px !important;
    min-height: 2px !important;
    margin: 0 !important;
    padding: 0 !important;
    border: 0 !important;
    border-radius: 3px !important;
    background: var(--on-header, #fff) !important;
    opacity: 1 !important;
    visibility: visible !important;
  }
}
@media (max-width: 390px) {
  .header-inner { width: calc(100% - 16px) !important; gap: 6px !important; }
  .site-logo { min-width: 0; overflow: hidden; }
  .site-logo img { max-width: min(116px, 35vw) !important; }
  .header-actions .main-btn { max-width: 94px; min-width: 0; padding-inline: 8px !important; }
}

/* 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 */