.app-header{position:sticky;top:0;z-index:20;background:var(--color-surface);border-bottom:1px solid var(--color-border)}.app-header__inner{display:flex;align-items:center;flex-wrap:wrap;gap:var(--space-3) var(--space-5);min-height:var(--header-height);max-width:var(--shell-max-width);margin:0 auto;padding:var(--space-2) var(--container-padding)}.app-brand{flex:0 0 auto;color:var(--color-text);text-decoration:none;font-family:var(--font-display);font-size:var(--text-lg);font-weight:var(--weight-semibold);line-height:1.15}.app-brand__accent{color:var(--color-primary)}.app-brand__subtitle{display:block;font-size:var(--text-xs);font-weight:var(--weight-normal);color:var(--color-text-muted)}.app-nav{display:flex;align-items:center;gap:var(--space-1);margin-right:auto;overflow-x:auto;scrollbar-width:none}.app-nav::-webkit-scrollbar{display:none}.app-nav__link{position:relative;display:inline-flex;align-items:center;white-space:nowrap;min-height:var(--tap-target);padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);color:var(--color-text-muted);text-decoration:none;font-size:var(--text-sm);font-weight:var(--weight-semibold);transition:color var(--duration-fast) var(--easing-standard)}.app-nav__link:hover,.app-nav__link[aria-current=page]{color:var(--color-text)}.app-nav__link[aria-current=page]:after{content:"";position:absolute;left:var(--space-3);right:var(--space-3);bottom:2px;height:2px;border-radius:var(--radius-pill);background:var(--color-primary)}.theme-toggle{flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;width:var(--tap-target);height:var(--tap-target);padding:0;border:1px solid transparent;border-radius:var(--radius-pill);background:transparent;color:var(--color-text-muted);cursor:pointer;transition:color var(--duration-fast) var(--easing-standard),background-color var(--duration-fast) var(--easing-standard)}.theme-toggle:hover{color:var(--color-text);background:var(--color-surface-sunken)}.app-header__action{flex:0 0 auto;min-height:var(--tap-target);padding:var(--space-2) var(--space-5);border:1px solid transparent;border-radius:var(--radius-pill);background:var(--color-cta);color:var(--color-on-cta);font-size:var(--text-lg);font-weight:var(--weight-semibold);cursor:pointer;transition:background-color var(--duration-fast) var(--easing-standard)}.app-header__action:hover{background:var(--color-cta-hover)}@media(max-width:60rem){.app-nav{order:3;flex:1 0 100%;margin:0 calc(var(--container-padding) * -1);padding:0 var(--container-padding);border-top:1px solid var(--color-border)}.app-brand{margin-right:auto}}.app-footer{--color-text: #ffffff;--color-text-muted: var(--color-accent-cyan);--color-primary: var(--color-tertiary);--focus-ring: 2px solid var(--color-tertiary);margin-top:auto;background:var(--color-brand);color:var(--color-text);font-size:var(--text-sm)}.app-footer__inner{display:grid;gap:var(--space-6);max-width:var(--shell-max-width);margin:0 auto;padding:var(--space-8) var(--container-padding)}.app-footer__groups{display:grid;gap:var(--space-5);grid-template-columns:repeat(auto-fit,minmax(min(100%,12rem),1fr))}.app-footer__group{display:grid;gap:var(--space-2);align-content:start}.app-footer__heading{font-family:var(--font-sans);font-size:var(--text-xs);font-weight:var(--weight-medium);letter-spacing:var(--tracking-label);text-transform:uppercase;color:var(--color-text-muted)}.app-footer a{color:var(--color-text);text-decoration:none}.app-footer a:hover{color:var(--color-primary);text-decoration:underline}.app-footer__note{max-width:var(--reading-max-width);color:var(--color-text-muted)}.app-footer__note a{color:var(--color-text);text-decoration:underline}.app-shell{display:flex;flex-direction:column;min-height:100vh}.app-shell__main{min-width:0;padding:var(--space-6) var(--container-padding) var(--space-8)}.app-shell__main:focus{outline:none}.app-shell__content{max-width:var(--content-max-width);margin:0 auto}@media(max-width:60rem){.app-shell__main{padding:var(--space-4) var(--container-padding) var(--space-6)}}:root{color-scheme:light dark;--color-brand: #285f74;--color-secondary: #00a0af;--color-tertiary: #e6e33c;--color-accent-cyan: #a7e8ea;--color-accent-lime: #dceb4a;--color-bg: light-dark(#f6fbfc, #0b1d24);--color-surface: light-dark(#ffffff, #102a33);--color-surface-raised: light-dark(#ffffff, #17363f);--color-surface-sunken: light-dark(#eaf2f4, #17363f);--color-border: light-dark(#285f7426, #ffffff26);--color-border-strong: light-dark(#285f7459, #ffffff4d);--color-meter-track: color-mix(in oklab, var(--color-text) 18%, transparent);--color-text: light-dark(#285f74, #eaf2f4);--color-text-muted: light-dark(#4a7a8b, #a3c0c9);--color-text-inverse: light-dark(#ffffff, #285f74);--color-primary: light-dark(#007f8b, #5fd6e2);--color-primary-hover: light-dark(#00646e, #8ae4ec);--color-primary-subtle: color-mix(in oklab, var(--color-secondary) 12%, var(--color-surface));--color-on-primary: light-dark(#ffffff, #0b1d24);--color-cta: var(--color-tertiary);--color-cta-hover: color-mix(in oklab, var(--color-tertiary) 88%, var(--color-brand));--color-on-cta: var(--color-brand);--color-success: var(--color-primary);--color-success-subtle: var(--color-primary-subtle);--color-warning: light-dark(#6b6a12, var(--color-accent-lime));--color-warning-subtle: color-mix(in oklab, var(--color-tertiary) 24%, var(--color-surface));--color-danger: light-dark(#c93b3b, #f08585);--color-danger-subtle: color-mix(in oklab, #d64545 12%, var(--color-surface));--space-1: 6px;--space-2: 10px;--space-3: 14px;--space-4: 20px;--space-5: 28px;--space-6: 40px;--space-7: 56px;--space-8: 88px;--font-sans: "Manrope", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-display: var(--font-sans);--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: .9375rem;--text-lg: 1.0625rem;--text-xl: 1.25rem;--text-2xl: 1.75rem;--text-3xl: clamp(1.625rem, 5vw, 2.25rem);--text-4xl: clamp(2rem, 7vw, 3.375rem);--leading-tight: 1.2;--leading-normal: 1.53;--leading-relaxed: 1.7;--weight-normal: 500;--weight-medium: 600;--weight-semibold: 700;--weight-bold: 700;--weight-display: 800;--tracking-label: .04em;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 16px;--radius-xl: 28px;--radius-pill: 9999px;--shadow-sm: 0 1px 2px light-dark(rgb(40 95 116 / 8%), rgb(0 0 0 / 40%));--shadow-md: 0 8px 24px light-dark(rgb(40 95 116 / 12%), rgb(0 0 0 / 50%));--shell-max-width: 80rem;--content-max-width: 75rem;--reading-max-width: 43rem;--container-padding: 20px;--header-height: 72px;--tap-target: 44px;--duration-fast: .16s;--duration-normal: .22s;--easing-standard: cubic-bezier(.2, .8, .2, 1);--focus-ring: 2px solid var(--color-primary);--focus-ring-offset: 2px}:root[data-theme=light]{color-scheme:light}:root[data-theme=dark]{color-scheme:dark}@media(prefers-reduced-motion:reduce){:root{--duration-fast: 0ms;--duration-normal: 0ms}}*,*:before,*:after{box-sizing:border-box}*{margin:0}html{-webkit-text-size-adjust:100%}body{min-height:100vh;font-family:var(--font-sans);font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased}h1,h2,h3,h4{font-family:var(--font-display);line-height:var(--leading-tight);font-weight:var(--weight-display);text-wrap:balance}h1{font-size:var(--text-3xl)}h2{font-size:var(--text-2xl)}h3{font-size:var(--text-xl)}@media(min-width:60rem){h1{font-size:var(--text-4xl)}}p{text-wrap:pretty}a{color:var(--color-primary)}button,input,select,textarea{font:inherit;color:inherit}img,svg{display:block;max-width:100%}:focus-visible{outline:var(--focus-ring);outline-offset:var(--focus-ring-offset);border-radius:var(--radius-sm)}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;left:var(--space-4);top:var(--space-4);z-index:100;padding:var(--space-2) var(--space-4);background:var(--color-primary);color:var(--color-on-primary);border-radius:var(--radius-pill);font-weight:var(--weight-semibold);transform:translateY(-200%);transition:transform var(--duration-fast) var(--easing-standard)}.skip-link:focus{transform:translateY(0)}.error-boundary{max-width:40rem;margin:var(--space-8) auto;padding:var(--space-6);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);display:flex;flex-direction:column;gap:var(--space-4)}.error-boundary__detail{font-family:var(--font-mono);font-size:var(--text-sm);background:var(--color-surface-sunken);padding:var(--space-3);border-radius:var(--radius-md);overflow-x:auto;white-space:pre-wrap}.error-boundary__actions{display:flex;gap:var(--space-3);align-items:center}.error-boundary__actions button{min-height:48px;padding:var(--space-2) var(--space-4);border:1px solid var(--color-primary);background:var(--color-primary);color:var(--color-on-primary);border-radius:var(--radius-pill);font-weight:var(--weight-semibold);cursor:pointer}.error-boundary__actions button:hover{background:var(--color-primary-hover)}