.nav-sections{position:relative}.nav-sections__btn{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;padding:8px 14px;min-height:44px;border:1px solid var(--border-2);border-radius:8px;background:var(--surface);color:var(--ink-2);cursor:pointer}.nav-sections__btn:hover,.nav-sections__btn[aria-expanded=true]{border-color:var(--accent);color:var(--accent)}.nav-sections__menu{position:absolute;top:calc(100% + 8px);left:0;min-width:200px;padding:6px;margin:0;list-style:none;background:var(--surface);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-menu,0 12px 40px rgba(0,0,0,.12));z-index:var(--z-dropdown,200)}.nav-sections__menu[hidden],.prefs-menu[hidden]{display:none!important}.nav-sections__menu a{display:flex;align-items:center;min-height:44px;padding:0 12px;font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--ink-2);text-decoration:none;border-radius:7px}.nav-sections__menu a:hover,.nav-sections__menu a[aria-current=true]{color:var(--accent);background:var(--accent-bg)}.nav-utilities{display:flex;align-items:center;gap:6px;flex-shrink:0}.nav-utilities .header-rm-exit,.nav-utilities .header-rm-toggle,.nav-utilities .nav-resume-icon,.nav-utilities .theme-pick-btn{width:44px;height:44px;padding:0;justify-content:center}.nav-utilities .lang-pick-btn{width:auto;min-width:44px;padding:0 10px}.nav-utilities .header-rm-toggle span:not(.header-rm-dot),.nav-utilities .nav-resume-icon span{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.prefs-menu--fixed{z-index:calc(var(--z-drawer,400) + 20)!important}.mobile-nav-prefs{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%;min-width:0}.mobile-nav-prefs .prefs-cell{display:flex;flex-direction:column;align-items:stretch;gap:6px;min-width:0}.mobile-nav-prefs .lang-picker,.mobile-nav-prefs .theme-picker{width:100%}.mobile-nav-prefs .lang-pick-btn,.mobile-nav-prefs .theme-pick-btn{width:100%}.mobile-nav-actions{display:flex;flex-direction:column;gap:8px;width:100%;min-width:0}.mobile-nav-actions .mobile-rm-toggle,.mobile-nav-actions .nav-resume{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;box-sizing:border-box;min-height:48px}.mobile-nav-actions .mobile-rm-label{font-family:var(--mono);font-size:11px;letter-spacing:.05em}.mobile-nav-prefs .prefs-cell-label{font-family:var(--mono);font-size:9px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3)}.mobile-nav-prefs .lang-pick-btn,.mobile-nav-prefs .theme-pick-btn{width:100%;min-height:44px}.section-rail{display:none;position:sticky;top:var(--nav-h,56px);z-index:calc(var(--z-sticky,100) - 2);background:var(--header-bg,var(--bg));backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border);padding:0 max(var(--page-pad),env(safe-area-inset-left));padding-right:max(var(--page-pad),env(safe-area-inset-right))}.section-rail__inner{max-width:var(--max,820px);margin:0 auto;display:flex;gap:4px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding:8px 0}.section-rail__inner::-webkit-scrollbar{display:none}.section-rail a{flex-shrink:0;display:inline-flex;align-items:center;min-height:44px;padding:0 14px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2);text-decoration:none;border:1px solid transparent;border-radius:999px;white-space:nowrap}.section-rail a:hover,.section-rail a[aria-current=true]{color:var(--accent);border-color:var(--accent);background:var(--accent-bg)}.has-section-rail .nav-sections--desktop{display:none!important}@media (min-width:820px){.nav-links--inline{display:none!important}.section-rail{display:block}.nav-sections--desktop:not(.has-section-rail *){display:block}body:has(.section-rail) .nav-sections--desktop{display:none!important}}@media (max-width:819px){.nav-sections--desktop{display:none}}.platform-header{position:fixed;inset:0 0 auto 0;height:var(--nav-h,56px);z-index:var(--z-sticky,100);display:flex;align-items:center;background:var(--header-bg,var(--casebook-header-bg,var(--bg)));backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border,var(--casebook-border));padding-left:max(var(--page-pad,16px),env(safe-area-inset-left));padding-right:max(var(--page-pad,16px),env(safe-area-inset-right));padding-top:env(safe-area-inset-top,0)}.platform-header--casebook{position:sticky;top:0;height:var(--nav-h,56px)}.platform-header--casebook .nav-inner{max-width:1100px;width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px}.platform-header--casebook .nav-right{display:flex;align-items:center;gap:12px;flex-shrink:0}.platform-header--casebook .nav-utilities{align-items:center}.platform-header--casebook .casebook-header__nav{display:flex;align-items:center;gap:8px;list-style:none;margin:0;padding:0}.platform-header--casebook .casebook-header__nav a{font-family:var(--mono, monospace);font-size:11px;letter-spacing:.05em;color:var(--casebook-ink-muted,var(--ink-2));text-decoration:none;padding:6px 8px;border-radius:6px;min-height:44px;display:inline-flex;align-items:center}.platform-header--casebook .casebook-header__nav a:hover,.platform-header--casebook .casebook-header__nav a[aria-current=page]{color:var(--casebook-accent,var(--accent));background:var(--casebook-surface-2,var(--surface-2))}.mobile-nav--casebook .mobile-nav-links a[aria-current=page]{color:var(--casebook-accent,var(--accent))}.mobile-nav--casebook .mobile-nav-footer__hint{margin:16px 0 0;padding-top:16px;border-top:1px solid var(--border,var(--casebook-border));font-family:var(--mono, monospace);font-size:11px;color:var(--ink-3,var(--casebook-ink-faint))}.platform-header--casebook .hamburger{display:inline-flex}@media (min-width:640px){.platform-header--casebook .hamburger{display:none}}.platform-header--casebook .nav-logo{font-family:var(--serif, 'DM Serif Display', Georgia, serif);font-size:17px;color:var(--casebook-ink,var(--ink));text-decoration:none}.platform-header--casebook .nav-logo span{color:var(--casebook-accent,var(--accent))}.platform-header__nav{display:none}@media (min-width:640px){.platform-header--casebook .platform-header__nav{display:block}.platform-header--casebook .nav-right{flex:1;justify-content:flex-end;gap:12px}}.casebook-prefs__menu{min-width:220px}.prefs-menu-list{list-style:none;margin:0;padding:0 6px 8px}.prefs-menu-list .theme-menu-item{width:100%;text-align:left;border:none;background:0 0;cursor:pointer}.theme-picker{position:relative}.theme-pick-btn{width:44px;height:44px;border-radius:8px;border:1px solid var(--border,var(--casebook-border));background:0 0;color:var(--ink-2,var(--casebook-ink-muted));cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:color .2s,border-color .2s,background .2s}.theme-pick-btn:hover,.theme-pick-btn[aria-expanded=true]{color:var(--accent,var(--casebook-accent));border-color:var(--accent,var(--casebook-accent));background:var(--accent-bg,var(--casebook-surface-2))}.theme-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:192px;max-width:min(280px,92vw);max-height:min(70vh,420px);overflow-y:auto;list-style:none;margin:0;padding:6px;background:var(--surface,var(--casebook-surface));border:1px solid var(--border,var(--casebook-border));border-radius:var(--radius,10px);box-shadow:var(--shadow-menu,0 12px 40px rgba(0,0,0,.12));z-index:var(--z-dropdown,200)}.theme-menu-item{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:7px;font-family:var(--sans, system-ui, sans-serif);font-size:13px;color:var(--ink-2,var(--casebook-ink-muted));cursor:pointer;pointer-events:auto;white-space:nowrap;outline:0;transition:background .15s,color .15s}.theme-menu-item:focus,.theme-menu-item:hover{background:var(--surface-2,var(--casebook-surface-2));color:var(--ink,var(--casebook-ink))}.theme-menu-item[aria-checked=true],.theme-menu-item[aria-selected=true]{background:var(--accent-bg,var(--casebook-surface-2));color:var(--accent,var(--casebook-accent));font-weight:500}.theme-swatch{width:14px;height:14px;border-radius:50%;flex-shrink:0;border:1.5px solid transparent}.ts-light{background:#faf8f4;border-color:#bf5a32}.ts-dark{background:#141210;border-color:#e07a52}.ts-sage{background:#f4f7f4;border-color:#2d7a4f}.ts-slate{background:#141b22;border-color:#3bbfbf}.ts-dusk{background:#18131e;border-color:#d4a840}.ts-high-contrast{background:#000;border-color:gold}.lang-pick-btn{width:auto;min-width:44px;padding:0 10px;gap:5px}.lang-pick-label{font-family:var(--mono, monospace);font-size:10px;font-weight:500;letter-spacing:.06em}.lang-menu{max-height:320px;overflow-y:auto}#casebook-portfolio-themes .theme-menu-item{list-style:none}.casebook-prefs__hint{font-size:11px;color:var(--ink-3,var(--casebook-ink-faint));padding:6px 12px 4px;margin:0}.casebook-prefs__link{display:block;padding:8px 12px 10px;font-size:12px;color:var(--accent,var(--casebook-accent))}.prefs-section-label{font-family:var(--mono, monospace);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--casebook-ink-faint,var(--ink-3));padding:4px 10px 6px;margin:0}.prefs-swatch-row{display:flex;flex-wrap:wrap;gap:6px;padding:4px 8px 10px}.prefs-swatch-row button{display:flex;align-items:center;gap:8px;min-height:40px;padding:6px 10px;border:1px solid var(--casebook-border,var(--border));border-radius:8px;background:0 0;color:var(--casebook-ink-muted,var(--ink-2));cursor:pointer;font-size:12px}.prefs-swatch-row button[aria-checked=true],.prefs-swatch-row button[aria-selected=true]{border-color:var(--casebook-accent,var(--accent));color:var(--casebook-accent,var(--accent));background:var(--casebook-surface-2,var(--accent-bg))}.casebook-prefs__menu[hidden]{display:none!important}@media (pointer:coarse){.nav-utilities{gap:8px}.mobile-nav-prefs{gap:12px}}