/* Password input with visibility toggle */
    .password-wrap { position: relative; display: grid; }
    .password-wrap input { padding-right: 46px; }
    .password-toggle {
      position: absolute; top: 50%; right: 8px; transform: translateY(-50%);
      width: 32px; height: 32px; border-radius: var(--radius-sm);
      border: 1px solid transparent; background: transparent; color: var(--muted);
      display: grid; place-items: center; cursor: pointer; padding: 0;
      transition: background-color .14s ease, color .14s ease, border-color .14s ease;
    }
    .password-toggle:hover { background: var(--surface-2); color: var(--text); border-color: var(--border); }
    .password-toggle:focus-visible { outline: none; box-shadow: var(--focus-ring-soft); }
    .password-toggle svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
    .password-toggle .eye-off { display: none; }
    .password-toggle.is-visible .eye-open { display: none; }
    .password-toggle.is-visible .eye-off { display: block; }

    /* Professional mobile offcanvas navigation */
    .mobile-menu-btn { display: none; }
    .mobile-backdrop { display: none; }
    .mobile-drawer { display: none; }
    .drawer-head { display: none; }
    .drawer-close { display: none; }

    .main-nav a,
    .mobile-nav a,
    .settings-btn,
    .bookmark-nav-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .main-nav a.header-icon-count-btn,
    .header-icon-count-btn {
      min-width: var(--header-control-h, 40px);
      justify-content: center;
      padding-inline: 12px;
    }

    .main-nav a.header-icon-count-btn .inquiry-nav-count,
    .header-icon-count-btn .bookmark-nav-count {
      margin-left: 2px;
    }

    .nav-icon,
    .settings-btn .thumb-gear-icon {
      width: 18px;
      height: 18px;
      min-width: 18px;
      max-width: 18px;
      flex: 0 0 18px;
      color: currentColor;
      fill: none;
      stroke: currentColor;
    }

    .main-nav a.is-active .nav-icon,
    .mobile-nav a.is-active .nav-icon,
    .thumb-item.is-active .nav-icon { color: var(--btn-primary-text); }

    @media (max-width: 1040px) {
      .layout { grid-template-columns: 1fr; }
      .sidebar { position: static; }
      .topbar-inner { padding: 0; }
      .nav-card { display: flex; overflow: auto; }
      .nav-card a { flex: 0 0 auto; }
      .media-hero { grid-template-columns: 1fr; }
      .media-visual { border-right: 0; border-bottom: 1px solid var(--border); }
    }
    @media (max-width: 1100px) {
      .footer-grid { grid-template-columns: repeat(3, minmax(120px, 1fr)); }
      .footer-contact-card { grid-column: 1 / -1; }
    }
    @media (max-width: 780px) {
      .page, .topbar-inner { width: min(100% - 22px, var(--max)); }
      .topbar-inner { min-height: 58px; }
      .brand span { display: none; }
      .brand { width: 100%; }
      .header-actions { display: grid; grid-template-columns: 1fr; gap: 8px; }
      .main-nav { width: 100%; display: grid; grid-template-columns: 1fr 1fr; }
      .top-switches { width: 100%; display: grid; grid-template-columns: 1fr 1fr; }
      .mini-switch { justify-content: center; }
      .switch-grid { grid-template-columns: 1fr; }
      .footer-inner { width: min(var(--max), calc(100% - 24px)); padding: 24px 0 18px; }
      .footer-topline { display: grid; gap: 14px; align-items: start; }
      .footer-meta-row { justify-content: flex-start; }
      .footer-grid { grid-template-columns: 1fr; gap: 22px; padding: 22px 0; }
      .footer-contact-card { padding: 15px; }
      .footer-bottom { display: grid; justify-items: start; }
      .footer-legal { justify-content: flex-start; }
      .span-8, .span-6, .span-4, .span-3, .form-field, .form-field.third, .form-field.quarter { grid-column: span 12; }
      .choice-grid, .media-grid, .stats { grid-template-columns: 1fr; }
      .media-copy { padding: 22px; }
      .media-meta { grid-template-columns: 1fr; }
      .mock-browser { width: 92%; }
      .dl { grid-template-columns: 1fr; gap: 4px; }
      .timeline-row { grid-template-columns: 1fr; gap: 3px; }
      .toolbar, .toolbar-left, .toolbar-right, .btn-row { align-items: stretch; }
      .button-group { padding: 14px; }
      .toolbar-left, .toolbar-right { width: 100%; }
      .btn, .toolbar input, .toolbar select { width: 100%; }
    }
    @media (max-width: 460px) {
      :root { --h: 46px; }
      .hero { padding-top: 28px; }
      .display { font-size: 38px; }
      .media-visual { min-height: 260px; }
      .mock-grid { grid-template-columns: 1fr; }
      .segmented { width: 100%; display: grid; grid-template-columns: repeat(3, 1fr); border-radius: var(--radius-lg); }
      .segmented label { border-radius: var(--radius-md); }
    }



    /* v22: Mobile-first spacing cleanup
       Desktop keeps the framed section-card look. Tablet gets tighter cards.
       Mobile removes the outer category-card frame so content has more usable width. */
    @media (min-width: 781px) and (max-width: 1040px) {
      .main { gap: 18px; }
    }

    @media (max-width: 780px) {
      .page {
        width: min(100% - 28px, var(--max));
      }
      .layout {
        gap: 16px;
      }
      .main {
        gap: 10px;
      }
      section[id] {
        scroll-margin-top: 76px;
      }
      .subgrid {
        gap: 14px;
      }
      .nav-card {
        border-radius: var(--radius-lg);
        box-shadow: none;
      }
      .hero {
        padding-bottom: 22px;
      }
    }

    @media (max-width: 460px) {
      .page {
        width: min(100% - 24px, var(--max));
      }
      .main {
        gap: 8px;
      }
    }


    @media (max-width: 820px) {
      .topbar-inner { width: min(100% - 22px, var(--max)); min-height: 62px; padding: 0; flex-wrap: nowrap; }
      .brand { width: auto; min-width: 0; flex: 1 1 auto; }
      .brand span { display: none; }
      .mobile-menu-btn {
        display: inline-flex; align-items: center; justify-content: center;
        width: 42px; height: 42px; border-radius: var(--radius-md);
        border: 1px solid var(--border-2); background: var(--surface); color: var(--text);
        cursor: pointer; margin-left: auto;
      }
      .mobile-menu-btn:hover { background: var(--surface-2); border-color: var(--border-2); }
      .mobile-menu-btn:focus-visible { outline: none; box-shadow: var(--focus-ring-soft); }
      .mobile-menu-btn span,
      .mobile-menu-btn span::before,
      .mobile-menu-btn span::after {
        display: block; width: 18px; height: 2px; border-radius: 999px; background: currentColor; content: ""; transition: transform .18s ease, opacity .18s ease;
      }
      .mobile-menu-btn span::before { transform: translateY(-6px); }
      .mobile-menu-btn span::after { transform: translateY(4px); }
      body.nav-open .mobile-menu-btn span { transform: rotate(45deg); }
      body.nav-open .mobile-menu-btn span::before { opacity: 0; transform: translateY(0); }
      body.nav-open .mobile-menu-btn span::after { transform: translateY(-2px) rotate(-90deg); }
      .mobile-backdrop {
        display: block; position: fixed; inset: 0; z-index: 1800;
        background: rgba(0,0,0,.42); opacity: 0; pointer-events: none;
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        transition: opacity .18s ease;
      }
      body.nav-open .mobile-backdrop { opacity: 1; pointer-events: auto; }
      .header-actions { display: none; }
      .mobile-drawer {
        display: flex; position: fixed; z-index: 1810; top: 0; right: 0; bottom: 0;
        width: min(390px, calc(100vw - 28px));
        padding: 0; margin: 0;
        flex-direction: column; align-items: stretch; justify-content: flex-start;
        gap: 0; background: var(--surface); border-left: 1px solid var(--border);
        box-shadow: var(--shadow); transform: translateX(104%);
        transition: transform .22s ease; overflow-y: auto;
      }
      body.nav-open .mobile-drawer { transform: translateX(0); }
      .drawer-head {
        display: flex; align-items: center; justify-content: space-between; gap: 14px;
        min-height: 72px; padding: 16px 18px; border-bottom: 1px solid var(--border);
        background: var(--surface);
      }
      .drawer-head strong { display: block; font-size: 17px; line-height: 1.2; letter-spacing: -.02em; }
      .drawer-head span { display: block; margin-top: 2px; color: var(--muted); font-size: 12px; }
      .drawer-close {
        position: relative;
        display: inline-grid; place-items: center; flex: 0 0 auto; width: 42px; height: 42px;
        border-radius: var(--radius-md); border: 1px solid var(--border); background: var(--surface-2);
        color: var(--text); cursor: pointer; padding: 0;
      }
      .drawer-close::before,
      .drawer-close::after {
        content: "";
        position: absolute;
        width: 17px;
        height: 2px;
        border-radius: 999px;
        background: currentColor;
        left: 50%;
        top: 50%;
        transform-origin: center;
      }
      .drawer-close::before { transform: translate(-50%, -50%) rotate(45deg); }
      .drawer-close::after { transform: translate(-50%, -50%) rotate(-45deg); }
      .drawer-close:hover { background: var(--surface-3); border-color: var(--border-2); }
      .drawer-close:focus-visible { outline: none; box-shadow: var(--focus-ring-soft); }
      .mobile-nav {
        width: 100%; display: grid; grid-template-columns: 1fr;
        gap: 10px; padding: 18px; border: 0; border-radius: 0; background: transparent;
      }
      .mobile-nav a {
        min-height: 48px; display: inline-flex; align-items: center; justify-content: flex-start; padding: 0 15px;
        border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--surface-2);
        color: var(--text-2); font-size: 15px; font-weight: 600; text-decoration: none;
      }
      .mobile-nav-more {
        display: grid;
        gap: 0;
      }
      .mobile-nav-more .nav-collapsible-toggle {
        min-height: 48px;
        display: inline-flex;
        align-items: center;
        justify-content: flex-start;
        gap: 10px;
        padding: 0 15px;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        background: var(--surface-2);
        color: var(--text-2);
        font-size: 15px;
        font-weight: 600;
        text-decoration: none;
        cursor: pointer;
        appearance: none;
        font-family: inherit;
      }
      .mobile-nav-more .nav-collapsible-toggle:hover,
      .mobile-nav-more.is-open .nav-collapsible-toggle {
        background: var(--surface-3);
        color: var(--text);
        border-color: var(--border-2);
      }
      .mobile-nav-more.is-active .nav-collapsible-toggle {
        background: var(--btn-primary-bg);
        color: var(--btn-primary-text);
        border-color: var(--btn-primary-border);
      }
      .mobile-nav-more .nav-chevron {
        margin-left: auto;
        transition: transform .16s ease;
      }
      .mobile-nav-more.is-open .nav-chevron { transform: rotate(180deg); }
      .mobile-nav-submenu {
        display: grid;
        gap: 0;
        overflow: hidden;
        opacity: 0;
        max-height: 0;
        padding-inline: 0;
        border: 0;
        background: transparent;
        box-shadow: none;
        transition: max-height .22s ease, opacity .16s ease, padding-block .2s ease, gap .2s ease;
      }
      .mobile-nav-more.is-open .mobile-nav-submenu {
        gap: 4px;
        opacity: 1;
        max-height: 320px;
        padding-block: 8px 2px;
      }
      .mobile-nav-submenu > * { min-height: 0; }
      .mobile-nav-submenu a {
        min-height: 42px;
        padding-inline: 14px;
        border-radius: var(--radius-md);
        border-color: var(--border);
        background: var(--surface-3);
      }
      .mobile-nav-submenu a:hover {
        background: var(--surface-2);
        border-color: var(--border-2);
      }
      .mobile-nav-submenu a.is-active {
        background: var(--btn-primary-bg);
        border-color: var(--btn-primary-border);
        color: var(--btn-primary-text);
      }
      .mobile-nav a:hover { background: var(--surface-3); border-color: var(--border-2); color: var(--text); }
      .mobile-nav a.is-active {
        background: var(--btn-primary-bg);
        border-color: var(--btn-primary-border);
        color: var(--btn-primary-text);
      }
      .mobile-switches {
        width: 100%; display: grid; grid-template-columns: 1fr; gap: 10px;
        padding: 0 18px 18px; margin-top: auto;
      }
      .mobile-switches .mini-switch {
        justify-content: space-between;
        min-height: 48px;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        padding-inline: 14px;
        background: var(--surface-2);
      }
      .mobile-switches .mini-switch .mini-value { text-align: right; }
    }

    body.desktop-burger-nav .topbar-inner {
      width: min(var(--max), calc(100% - 32px));
      flex-wrap: nowrap;
    }
    body.desktop-burger-nav .brand {
      width: auto;
      min-width: 0;
      flex: 1 1 auto;
    }
    body.desktop-burger-nav .header-actions { display: none; }
    body.desktop-burger-nav .mobile-menu-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 auto;
      width: 42px;
      height: 42px;
      margin-left: auto;
      border: 1px solid var(--border-2);
      border-radius: var(--radius-md);
      background: var(--surface);
      color: var(--text);
      cursor: pointer;
    }
    body.desktop-burger-nav .mobile-menu-btn:hover {
      background: var(--surface-2);
      border-color: var(--border-2);
    }
    body.desktop-burger-nav .mobile-menu-btn:focus-visible {
      outline: none;
      box-shadow: var(--focus-ring-soft);
    }
    body.desktop-burger-nav .mobile-menu-btn span,
    body.desktop-burger-nav .mobile-menu-btn span::before,
    body.desktop-burger-nav .mobile-menu-btn span::after {
      display: block;
      width: 18px;
      height: 2px;
      border-radius: 999px;
      background: currentColor;
      content: "";
      transition: transform .18s ease, opacity .18s ease;
    }
    body.desktop-burger-nav .mobile-menu-btn span::before { transform: translateY(-6px); }
    body.desktop-burger-nav .mobile-menu-btn span::after { transform: translateY(4px); }
    body.desktop-burger-nav.nav-open .mobile-menu-btn span { transform: rotate(45deg); }
    body.desktop-burger-nav.nav-open .mobile-menu-btn span::before {
      opacity: 0;
      transform: translateY(0);
    }
    body.desktop-burger-nav.nav-open .mobile-menu-btn span::after {
      transform: translateY(-2px) rotate(-90deg);
    }
    body.desktop-burger-nav .mobile-backdrop {
      display: block;
      position: fixed;
      inset: 0;
      z-index: 1800;
      background: rgba(0, 0, 0, .42);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      opacity: 0;
      pointer-events: none;
      transition: opacity .18s ease;
    }
    body.desktop-burger-nav.nav-open .mobile-backdrop {
      opacity: 1;
      pointer-events: auto;
    }
    body.desktop-burger-nav .mobile-drawer {
      display: flex;
      position: fixed;
      z-index: 1810;
      top: 0;
      right: 0;
      bottom: 0;
      width: min(390px, calc(100vw - 28px));
      padding: 0;
      margin: 0;
      flex-direction: column;
      align-items: stretch;
      justify-content: flex-start;
      gap: 0;
      background: var(--surface);
      border-left: 1px solid var(--border);
      box-shadow: var(--shadow);
      transform: translateX(104%);
      transition: transform .22s ease;
      overflow-y: auto;
    }
    body.desktop-burger-nav.nav-open .mobile-drawer { transform: translateX(0); }
    body.desktop-burger-nav .drawer-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      min-height: 72px;
      padding: 16px 18px;
      border-bottom: 1px solid var(--border);
      background: var(--surface);
    }
    body.desktop-burger-nav .drawer-head strong {
      display: block;
      font-size: 17px;
      line-height: 1.2;
      letter-spacing: -.02em;
    }
    body.desktop-burger-nav .drawer-close {
      position: relative;
      display: inline-grid;
      place-items: center;
      flex: 0 0 auto;
      width: 42px;
      height: 42px;
      padding: 0;
      border: 0;
      border-radius: var(--radius-md);
      background: var(--surface-2);
      color: var(--text);
      cursor: pointer;
    }
    body.desktop-burger-nav .drawer-close::before,
    body.desktop-burger-nav .drawer-close::after {
      content: "";
      position: absolute;
      left: 50%;
      top: 50%;
      width: 17px;
      height: 2px;
      border-radius: 999px;
      background: currentColor;
      transform-origin: center;
    }
    body.desktop-burger-nav .drawer-close::before { transform: translate(-50%, -50%) rotate(45deg); }
    body.desktop-burger-nav .drawer-close::after { transform: translate(-50%, -50%) rotate(-45deg); }
    body.desktop-burger-nav .mobile-nav {
      width: 100%;
      display: grid;
      grid-template-columns: 1fr;
      gap: 10px;
      padding: 18px;
      border: 0;
      border-radius: 0;
      background: transparent;
    }
    body.desktop-burger-nav .mobile-nav a,
    body.desktop-burger-nav .drawer-settings-btn {
      min-height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: flex-start;
      gap: 10px;
      padding: 0 15px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--surface-2);
      color: var(--text-2);
      font-size: 15px;
      font-weight: 600;
      text-decoration: none;
    }
    body.desktop-burger-nav .mobile-nav-more {
      display: grid;
      gap: 0;
    }
    body.desktop-burger-nav .mobile-nav-more .nav-collapsible-toggle {
      min-height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: flex-start;
      gap: 10px;
      padding: 0 15px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--surface-2);
      color: var(--text-2);
      font-size: 15px;
      font-weight: 600;
      text-decoration: none;
      cursor: pointer;
      appearance: none;
      font-family: inherit;
    }
    body.desktop-burger-nav .mobile-nav-more .nav-collapsible-toggle:hover,
    body.desktop-burger-nav .mobile-nav-more.is-open .nav-collapsible-toggle {
      background: var(--surface-3);
      color: var(--text);
      border-color: var(--border-2);
    }
    body.desktop-burger-nav .mobile-nav-more.is-active .nav-collapsible-toggle {
      background: var(--btn-primary-bg);
      color: var(--btn-primary-text);
      border-color: var(--btn-primary-border);
    }
    body.desktop-burger-nav .mobile-nav-more .nav-chevron {
      margin-left: auto;
      transition: transform .16s ease;
    }
    body.desktop-burger-nav .mobile-nav-more.is-open .nav-chevron { transform: rotate(180deg); }
    body.desktop-burger-nav .mobile-nav-submenu {
      display: grid;
      gap: 0;
      overflow: hidden;
      opacity: 0;
      max-height: 0;
      padding-inline: 0;
      border: 0;
      background: transparent;
      box-shadow: none;
      transition: max-height .22s ease, opacity .16s ease, padding-block .2s ease, gap .2s ease;
    }
    body.desktop-burger-nav .mobile-nav-more.is-open .mobile-nav-submenu {
      gap: 4px;
      opacity: 1;
      max-height: 320px;
      padding-block: 8px 2px;
    }
    body.desktop-burger-nav .mobile-nav-submenu > * { min-height: 0; }
    body.desktop-burger-nav .mobile-nav-submenu a {
      min-height: 42px;
      padding-inline: 14px;
      border-radius: var(--radius-md);
      border-color: var(--border);
      background: var(--surface-3);
    }
    body.desktop-burger-nav .mobile-nav-submenu a:hover {
      background: var(--surface-2);
      border-color: var(--border-2);
    }
    body.desktop-burger-nav .mobile-nav-submenu a.is-active {
      background: var(--btn-primary-bg);
      border-color: var(--btn-primary-border);
      color: var(--btn-primary-text);
    }
    body.desktop-burger-nav .mobile-nav a:hover,
    body.desktop-burger-nav .drawer-settings-btn:hover,
    body.desktop-burger-nav .drawer-settings-btn[aria-expanded="true"] {
      background: var(--surface-3);
      border-color: var(--border-2);
      color: var(--text);
    }
    body.desktop-burger-nav .mobile-nav a.is-active {
      background: var(--btn-primary-bg);
      border-color: var(--btn-primary-border);
      color: var(--btn-primary-text);
    }
    body.desktop-burger-nav .mobile-switches {
      width: 100%;
      display: grid;
      grid-template-columns: 1fr;
      gap: 10px;
      padding: 0 18px 18px;
      margin-top: auto;
    }
    body.desktop-burger-nav .mobile-switches .mini-switch {
      justify-content: space-between;
      min-height: 48px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding-inline: 14px;
      background: var(--surface-2);
    }


    /* v44: Smartphone Thumb Navigation Experiment
       Remove block: delete from "v42: Smartphone Thumb Navigation Experiment" to "End v40 thumb navigation experiment",
       plus the matching HTML block and JS block with the same labels. */
    .thumb-menu { display: none; }
    .thumb-content-backdrop { display: none; }
    .thumb-settings-panel { display: none; }
    .thumb-settings-heading-icon svg,
    .thumb-gear-icon {
      width: 20px;
      height: 20px;
      display: block;
      max-width: none;
      flex: 0 0 auto;
      color: currentColor;
      fill: none;
      stroke: currentColor;
      stroke-width: 1.9;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .thumb-gear-icon path,
    .thumb-gear-icon circle,
    .thumb-gear-icon line,
    .thumb-gear-icon polyline {
      fill: none;
      stroke: currentColor;
      stroke-width: 1.9;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    @media (max-width: 560px) {
      body.thumb-settings-lock,
      body.thumb-nav-lock { overflow: hidden; }
      .thumb-content-backdrop {
        position: fixed;
        inset: 0;
        z-index: 1790;
        display: block;
        opacity: 0;
        pointer-events: none;
        background: rgba(0, 0, 0, .38);
        backdrop-filter: blur(2px);
        transition: opacity .16s ease;
      }
      [data-theme="light"] .thumb-content-backdrop {
        background: rgba(24, 29, 36, .32);
      }
      body.thumb-nav-lock .thumb-content-backdrop,
      body.thumb-settings-lock .thumb-content-backdrop {
        opacity: 1;
        pointer-events: auto;
      }
      body.thumb-settings-lock .thumb-content-backdrop {
        z-index: 1820;
      }
    }

    @media (min-width: 561px) and (max-width: 820px) {
      .topbar-inner {
        width: min(100% - 24px, var(--max));
        min-height: 62px;
        gap: 12px;
      }
      .brand { flex: 1 1 auto; min-width: 0; }
      .brand span { display: none; }
      .header-actions { display: none; }
      .mobile-menu-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        flex: 0 0 auto;
        margin-left: auto;
      }
    }

    @media (max-width: 560px) {
      .header-actions,
      .mobile-menu-btn,
      .mobile-backdrop,
      .mobile-drawer { display: none !important; }

      .page { padding-bottom: 148px; }

      body.phone-header-nav .page { padding-bottom: 32px; }
      body.phone-header-nav .mobile-menu-btn { display: inline-flex !important; }
      body.phone-header-nav .mobile-backdrop { display: block !important; }
      body.phone-header-nav .mobile-drawer { display: flex !important; }
      body.phone-header-nav .thumb-menu { display: none !important; }
      body.phone-header-nav .drawer-settings-btn {
        display: inline-flex;
        min-height: 48px;
        justify-content: flex-start;
        gap: 10px;
        padding: 0 15px;
        border-radius: var(--radius-md);
        background: var(--surface-2);
        color: var(--text-2);
        font-size: 15px;
        font-weight: 600;
      }
      body.phone-header-nav .drawer-settings-btn:hover,
      body.phone-header-nav .drawer-settings-btn[aria-expanded="true"] {
        background: var(--surface-3);
        border-color: var(--border-2);
        color: var(--text);
      }


      .thumb-menu {
        --thumb-size: 58px;
        --thumb-item: 46px;
        --thumb-gap: 12px;
        display: block;
        position: fixed;
        right: calc(16px + env(safe-area-inset-right));
        bottom: calc(16px + env(safe-area-inset-bottom));
        z-index: 1810;
        width: var(--thumb-size);
        height: var(--thumb-size);
      }
      body.thumb-left .thumb-menu {
        right: auto;
        left: calc(16px + env(safe-area-inset-left));
      }
      .thumb-menu button,
      .thumb-menu a {
        -webkit-tap-highlight-color: transparent;
        text-decoration: none;
      }
      .thumb-main,
      .thumb-item,
      .thumb-settings-toggle {
        position: absolute;
        right: 0;
        bottom: 0;
        width: var(--thumb-size);
        height: var(--thumb-size);
        border-radius: 999px;
        border: 1px solid var(--border-2);
        background: var(--surface);
        color: var(--text);
        box-shadow: var(--shadow-soft);
        display: grid;
        place-items: center;
        cursor: pointer;
        transition: transform .2s ease, opacity .18s ease, background-color .15s ease, border-color .15s ease;
      }
      body.thumb-left .thumb-main { right: auto; left: 0; }
      body.thumb-left .thumb-item,
      body.thumb-left .thumb-settings-toggle { right: auto; left: calc((var(--thumb-size) - var(--thumb-item)) / 2); }
      .thumb-main {
        z-index: 4;
        background: var(--btn-primary-bg);
        color: var(--btn-primary-text);
        border-color: var(--btn-primary-border);
      }
      .thumb-main:hover,
      .thumb-main:focus-visible { background: color-mix(in srgb, var(--btn-primary-bg) 88%, var(--surface) 12%); }
      .thumb-main:focus-visible,
      .thumb-item:focus-visible,
      .thumb-settings-toggle:focus-visible { outline: none; box-shadow: var(--focus-ring-soft), var(--shadow-soft); }
      .thumb-lines,
      .thumb-lines::before,
      .thumb-lines::after {
        content: "";
        display: block;
        width: 21px;
        height: 2px;
        border-radius: 999px;
        background: currentColor;
        transition: transform .18s ease, opacity .18s ease;
      }
      .thumb-lines::before { transform: translateY(-7px); }
      .thumb-lines::after { transform: translateY(5px); }
      .thumb-menu.is-open .thumb-lines { transform: rotate(45deg); }
      .thumb-menu.is-open .thumb-lines::before { opacity: 0; transform: translateY(0); }
      .thumb-menu.is-open .thumb-lines::after { transform: translateY(-2px) rotate(-90deg); }
      .thumb-item,
      .thumb-settings-toggle {
        width: var(--thumb-item);
        height: var(--thumb-item);
        right: calc((var(--thumb-size) - var(--thumb-item)) / 2);
        bottom: calc((var(--thumb-size) - var(--thumb-item)) / 2);
        z-index: 2;
        opacity: 0;
        pointer-events: none;
        transform: translateX(0) scale(.72);
        background: var(--surface-2);
        color: var(--text-2);
        font-size: 13px;
        font-weight: 600;
      }
      .thumb-item:hover,
      .thumb-settings-toggle:hover { background: var(--surface-3); color: var(--text); border-color: var(--border-2); }
      .thumb-menu.is-open .thumb-item,
      .thumb-menu.is-open .thumb-settings-toggle {
        opacity: 1;
        pointer-events: auto;
        transform: translateX(calc(var(--i) * -1 * (var(--thumb-item) + var(--thumb-gap)))) scale(1);
      }
      body.thumb-left .thumb-menu.is-open .thumb-item,
      body.thumb-left .thumb-menu.is-open .thumb-settings-toggle {
        transform: translateX(calc(var(--i) * (var(--thumb-item) + var(--thumb-gap)))) scale(1);
      }
      .thumb-item span,
      .thumb-settings-toggle span { line-height: 1; }
      .thumb-full { display: none; white-space: nowrap; }
      .thumb-item > .nav-icon {
        width: 21px;
        height: 21px;
        min-width: 21px;
        max-width: 21px;
      }
      .thumb-settings-toggle .thumb-gear-icon {
        width: 24px;
        height: 24px;
        display: block;
        stroke: currentColor;
        fill: none;
        stroke-width: 1.9;
        stroke-linecap: round;
        stroke-linejoin: round;
      }
      .thumb-item,
      .thumb-settings-toggle { transition-delay: var(--close-delay, 0s); }
      .thumb-menu.is-open .thumb-item,
      .thumb-menu.is-open .thumb-settings-toggle { transition-delay: var(--open-delay, 0s); }
      .thumb-menu.thumb-long {
        --thumb-long-width: 154px;
        --thumb-long-side: calc(var(--thumb-size) + var(--thumb-gap));
      }
      .thumb-menu.thumb-long .thumb-item,
      .thumb-menu.thumb-long .thumb-settings-toggle {
        width: var(--thumb-long-width);
        min-width: 0;
        height: 46px;
        padding: 0 16px;
        border-radius: 999px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        overflow: visible;
        right: calc((var(--thumb-size) - 46px) / 2);
        bottom: calc((var(--thumb-size) - 46px) / 2);
        z-index: 1;
        transform: translateX(0) translateY(0) scale(.72);
        transform-origin: center right;
        transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease;
      }
      body.thumb-left .thumb-menu.thumb-long .thumb-item,
      body.thumb-left .thumb-menu.thumb-long .thumb-settings-toggle {
        left: calc((var(--thumb-size) - 46px) / 2);
        right: auto;
        transform-origin: center left;
      }
      .thumb-menu.thumb-long .thumb-main {
        z-index: 5;
      }
      .thumb-menu.thumb-long.is-open .thumb-item,
      .thumb-menu.thumb-long.is-open .thumb-settings-toggle {
        animation: thumbLongOpenRight .54s cubic-bezier(.2, .8, .2, 1) both;
        animation-delay: var(--open-delay, 0s);
      }
      body.thumb-left .thumb-menu.thumb-long.is-open .thumb-item,
      body.thumb-left .thumb-menu.thumb-long.is-open .thumb-settings-toggle {
        animation-name: thumbLongOpenLeft;
      }
      .thumb-menu.thumb-long.is-closing .thumb-item,
      .thumb-menu.thumb-long.is-closing .thumb-settings-toggle {
        opacity: 1;
        pointer-events: none;
        animation: thumbLongCloseRight .42s cubic-bezier(.4, 0, .2, 1) both;
        animation-delay: var(--close-delay, 0s);
      }
      body.thumb-left .thumb-menu.thumb-long.is-closing .thumb-item,
      body.thumb-left .thumb-menu.thumb-long.is-closing .thumb-settings-toggle {
        animation-name: thumbLongCloseLeft;
      }
      @keyframes thumbLongOpenRight {
        0% { opacity: 0; width: 46px; padding-inline: 0; transform: translateX(0) translateY(0) scale(.72); }
        16% { opacity: 1; width: 46px; padding-inline: 0; transform: translateX(0) translateY(0) scale(1); }
        42% { opacity: 1; width: 46px; padding-inline: 0; transform: translateX(calc(var(--thumb-long-side) * -1)) translateY(0) scale(1); }
        68% { opacity: 1; width: var(--thumb-long-width); padding-inline: 16px; transform: translateX(calc(var(--thumb-long-side) * -1)) translateY(0) scale(1); }
        100% { opacity: 1; width: var(--thumb-long-width); padding-inline: 16px; transform: translateX(calc(var(--thumb-long-side) * -1)) translateY(calc(var(--stack, 0) * -1 * (46px + var(--thumb-gap)))) scale(1); }
      }
      @keyframes thumbLongOpenLeft {
        0% { opacity: 0; width: 46px; padding-inline: 0; transform: translateX(0) translateY(0) scale(.72); }
        16% { opacity: 1; width: 46px; padding-inline: 0; transform: translateX(0) translateY(0) scale(1); }
        42% { opacity: 1; width: 46px; padding-inline: 0; transform: translateX(var(--thumb-long-side)) translateY(0) scale(1); }
        68% { opacity: 1; width: var(--thumb-long-width); padding-inline: 16px; transform: translateX(var(--thumb-long-side)) translateY(0) scale(1); }
        100% { opacity: 1; width: var(--thumb-long-width); padding-inline: 16px; transform: translateX(var(--thumb-long-side)) translateY(calc(var(--stack, 0) * -1 * (46px + var(--thumb-gap)))) scale(1); }
      }
      @keyframes thumbLongCloseRight {
        0% { opacity: 1; width: var(--thumb-long-width); padding-inline: 16px; transform: translateX(calc(var(--thumb-long-side) * -1)) translateY(calc(var(--stack, 0) * -1 * (46px + var(--thumb-gap)))) scale(1); }
        28% { opacity: 1; width: var(--thumb-long-width); padding-inline: 16px; transform: translateX(calc(var(--thumb-long-side) * -1)) translateY(0) scale(1); }
        56% { opacity: 1; width: 46px; padding-inline: 0; transform: translateX(calc(var(--thumb-long-side) * -1)) translateY(0) scale(1); }
        84% { opacity: 1; width: 46px; padding-inline: 0; transform: translateX(0) translateY(0) scale(1); }
        100% { opacity: 0; width: 46px; padding-inline: 0; transform: translateX(0) translateY(0) scale(.72); }
      }
      @keyframes thumbLongCloseLeft {
        0% { opacity: 1; width: var(--thumb-long-width); padding-inline: 16px; transform: translateX(var(--thumb-long-side)) translateY(calc(var(--stack, 0) * -1 * (46px + var(--thumb-gap)))) scale(1); }
        28% { opacity: 1; width: var(--thumb-long-width); padding-inline: 16px; transform: translateX(var(--thumb-long-side)) translateY(0) scale(1); }
        56% { opacity: 1; width: 46px; padding-inline: 0; transform: translateX(var(--thumb-long-side)) translateY(0) scale(1); }
        84% { opacity: 1; width: 46px; padding-inline: 0; transform: translateX(0) translateY(0) scale(1); }
        100% { opacity: 0; width: 46px; padding-inline: 0; transform: translateX(0) translateY(0) scale(.72); }
      }
      .thumb-menu.thumb-long .thumb-full {
        display: inline;
        font-size: 13px;
        font-weight: 850;
        letter-spacing: -.01em;
        opacity: 0;
        transform: translateX(-4px);
      }
      .thumb-menu.thumb-long.is-open .thumb-full {
        animation: thumbLongTextIn .54s cubic-bezier(.2, .8, .2, 1) both;
        animation-delay: var(--open-delay, 0s);
      }
      .thumb-menu.thumb-long.is-closing .thumb-full {
        animation: thumbLongTextOut .32s ease both;
        animation-delay: var(--close-delay, 0s);
      }
      @keyframes thumbLongTextIn {
        0%, 78% { opacity: 0; transform: translateX(-4px); }
        100% { opacity: 1; transform: translateX(0); }
      }
      @keyframes thumbLongTextOut {
        0% { opacity: 1; transform: translateX(0); }
        40%, 100% { opacity: 0; transform: translateX(-4px); }
      }
      .thumb-menu.thumb-long .thumb-settings-toggle .thumb-gear-icon { width: 20px; height: 20px; flex: 0 0 auto; opacity: 0; }
      .thumb-menu.thumb-long.is-open .thumb-settings-toggle .thumb-gear-icon {
        animation: thumbLongTextIn .54s cubic-bezier(.2, .8, .2, 1) both;
        animation-delay: var(--open-delay, 0s);
      }
      .thumb-menu.thumb-long.is-closing .thumb-settings-toggle .thumb-gear-icon {
        animation: thumbLongTextOut .32s ease both;
        animation-delay: var(--close-delay, 0s);
      }
      .thumb-item.is-active {
        background: var(--btn-primary-bg);
        color: var(--btn-primary-text);
        border-color: var(--btn-primary-border);
      }
    }
    /* End v40 thumb navigation experiment */




    /* v40: Unified settings trigger for smartphone navigation modes */
    .settings-btn {
      min-height: 100%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 0 14px;
      border: 1px solid var(--border);
      border-radius: 999px;
      background: var(--surface);
      color: var(--text-2);
      font: inherit;
      font-size: 13px;
      font-weight: 600;
      line-height: 1;
      white-space: nowrap;
      cursor: pointer;
    }
    .settings-btn:hover,
    .settings-btn[aria-expanded="true"] { background: var(--surface-2); color: var(--text); border-color: var(--border-2); }
    .settings-btn:focus-visible { outline: none; box-shadow: var(--focus-ring-soft); }
    .settings-btn .thumb-gear-icon { width: 18px; height: 18px; flex: 0 0 auto; }
    .top-switches .settings-btn { height: 100%; }
    .header-settings-btn { display: inline-flex; }
    .drawer-settings-btn { display: none; }

    .thumb-content-backdrop {
      display: block;
      position: fixed;
      inset: 0;
      z-index: 1790;
      background: rgba(0, 0, 0, .46);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      opacity: 0;
      pointer-events: none;
      transition: opacity .18s ease;
    }
    [data-theme="light"] .thumb-content-backdrop { background: rgba(18, 24, 34, .24); }
    body.settings-lock .thumb-content-backdrop,
    body.thumb-settings-lock .thumb-content-backdrop {
      opacity: 1;
      pointer-events: auto;
    }
    html.shell-overlay-lock {
      overflow-y: clip;
      overscroll-behavior: none;
    }
    body.shell-overlay-lock,
    body.settings-lock,
    body.thumb-settings-lock {
      overscroll-behavior: none;
    }

    .thumb-settings-panel {
      display: flex;
      flex-direction: column;
      position: fixed;
      z-index: 1820;
      right: 16px;
      bottom: 16px;
      width: min(332px, calc(100vw - 32px));
      max-height: calc(100dvh - 32px);
      padding: 14px;
      gap: 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      background: var(--surface);
      box-shadow: var(--shadow);
      opacity: 0;
      pointer-events: none;
      transform: translateY(14px) scale(.98);
      transform-origin: bottom right;
      transition: opacity .16s ease, transform .16s ease;
      overflow: auto;
    }
    body.settings-lock .thumb-settings-panel,
    body.thumb-settings-lock .thumb-settings-panel {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0) scale(1);
    }
    body.thumb-left .thumb-settings-panel {
      left: 16px;
      right: auto;
      transform-origin: bottom left;
    }
    .thumb-settings-title {
      display: flex;
      align-items: start;
      justify-content: space-between;
      gap: 12px;
      padding-bottom: 12px;
      margin-bottom: 0;
      border-bottom: 1px solid var(--border);
    }
    .thumb-settings-title strong {
      display: block;
      font-size: 14px;
      letter-spacing: -.01em;
    }
    .thumb-settings-heading {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      min-height: 32px;
    }
    .thumb-settings-heading-icon {
      width: 32px;
      height: 32px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: var(--text);
      flex: 0 0 auto;
    }
    .thumb-settings-heading-icon .thumb-gear-icon {
      width: 24px;
      height: 24px;
      display: block;
      stroke: currentColor;
      fill: none;
      stroke-width: 1.9;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .thumb-setting-list {
      display: grid;
      gap: 10px;
    }
    .thumb-setting-row {
      min-height: 46px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 8px 10px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: var(--surface-2);
    }
    .thumb-setting-card {
      min-height: 58px;
      padding: 10px 12px;
      cursor: pointer;
      transition: background-color .16s ease, border-color .16s ease, transform .12s ease;
    }
    .thumb-setting-card:hover {
      background: var(--surface-3);
      border-color: var(--border-2);
    }
    .thumb-setting-card:has(input:focus-visible) { box-shadow: var(--focus-ring-soft); }
    .thumb-setting-card:has(input:checked) {
      border-color: color-mix(in srgb, var(--btn-primary-border) 46%, var(--border) 54%);
      background: color-mix(in srgb, var(--btn-primary-bg) 10%, var(--surface-2) 90%);
    }
    .thumb-setting-copy {
      min-width: 0;
      display: grid;
      gap: 3px;
    }
    .thumb-setting-copy small {
      display: block;
      color: var(--muted);
      font-size: 11px;
      font-weight: 650;
      line-height: 1.25;
    }
    .thumb-setting-row .mini-switch {
      height: 32px;
      padding-inline: 0;
      border: 0;
      background: transparent;
      flex: 0 0 auto;
      align-self: center;
    }
    .thumb-setting-card .mini-switch {
      position: relative;
      min-width: 78px;
      justify-content: flex-end;
    }
    .thumb-setting-card .mini-switch:hover { background: transparent; }
    .thumb-setting-card .mini-switch:has(input:focus-visible) { box-shadow: none; }
    .thumb-setting-label {
      color: var(--text-2);
      font-size: 13px;
      font-weight: 750;
    }
    .thumb-position-row {
      display: grid;
      gap: 8px;
      align-items: stretch;
    }
    .thumb-position {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 6px;
    }
    .thumb-pos-btn {
      min-height: 34px;
      padding: 0 10px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--surface-2);
      color: var(--text-2);
      font: inherit;
      font-size: 12px;
      font-weight: 800;
      cursor: pointer;
    }
    .thumb-pos-btn:hover {
      background: var(--surface-3);
      color: var(--text);
      border-color: var(--border-2);
    }
    .thumb-pos-btn.is-active {
      background: var(--btn-primary-bg);
      color: var(--btn-primary-text);
      border-color: var(--btn-primary-border);
    }
    .thumb-pos-btn.is-active:hover {
      background: color-mix(in srgb, var(--btn-primary-bg) 88%, var(--surface) 12%);
      color: var(--btn-primary-text);
      border-color: var(--btn-primary-border);
    }
    .thumb-pos-btn:focus-visible { outline: none; box-shadow: var(--focus-ring-soft); }
    .thumb-settings-close {
      width: 100%;
      min-height: 42px;
      margin-top: 0;
      border: 1px solid var(--border-2);
      border-radius: var(--radius-md);
      background: var(--btn-primary-bg);
      color: var(--btn-primary-text);
      font: inherit;
      font-size: 13px;
      font-weight: 850;
      cursor: pointer;
    }
    .thumb-settings-close:hover { background: color-mix(in srgb, var(--btn-primary-bg) 88%, var(--surface) 12%); }
    .thumb-settings-close:focus-visible { outline: none; box-shadow: var(--focus-ring-soft); }
    .drawer-settings-btn {
      width: 100%;
      height: 44px;
      justify-content: flex-start;
      border-radius: var(--radius-md);
      padding-inline: 12px;
    }

    @media (max-width: 560px) {
      .thumb-settings-panel {
        left: 12px;
        right: 12px;
        bottom: 12px;
        width: auto;
        max-height: min(520px, calc(100dvh - 24px));
        border-radius: 20px;
      }
      body.thumb-left .thumb-settings-panel { left: 12px; right: 12px; }
    }


/* Mobile overflow guard */
.mobile-drawer,
.mobile-nav,
.thumb-menu,
.thumb-content-backdrop {
  max-width: 100vw;
}

.mobile-drawer {
  overflow-x: hidden;
}

@media (max-width: 820px) {
  .topbar,
  .header-inner,
  .mobile-drawer {
    max-width: 100vw;
  }
}


/* Keep mobile navigation above page headers, filters and app overlays. */
@media (max-width: 820px) {
	.mobile-backdrop {
		z-index: 1800;
	}

	.mobile-drawer {
		z-index: 1810;
	}
}

@media (max-width: 560px) {
	.thumb-content-backdrop {
		z-index: 1790;
	}

	.thumb-menu {
		z-index: 1810;
	}

	.thumb-settings-panel {
		z-index: 1820;
	}
}