:root{--color-bg: #ebeef4;--color-surface: #ffffff;--color-accent: #86cefa;--color-accent-2: #1750ac;--color-gold: #d09a14;--color-gold-dark: #c49214;--color-gold-light: #756948;--color-text: #1a1a2e;--color-text-muted: #5a5a7a;--color-error: #c0392b;--color-success: #27ae60;--font-heading: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;--font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, monospace;--radius-card: 0px;--radius-button: 0px;--shadow-card: 0 2px 8px rgba(0, 0, 0, .08);--shadow-button: 0 1px 4px rgba(0, 0, 0, .06);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--chart-line-color: var(--color-accent-2);--chart-axis-color: #ccc;--chart-grid-color: #eee;--chart-origin-marker: var(--color-gold)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:var(--font-body);color:var(--color-text);background:var(--color-bg)}h1,h2,h3{font-family:var(--font-heading)}.app-root{min-height:100%;display:grid;grid-template-rows:auto 1fr auto}.app-header{text-align:center;padding:var(--space-8) var(--space-4) var(--space-4)}.app-title{margin:0 0 var(--space-2) 0;font-family:var(--font-heading);font-weight:700}.app-subtitle{margin:0;color:var(--color-text-muted)}.app-main{display:flex;justify-content:center;padding:var(--space-6)}.app-footer{text-align:center;padding:var(--space-4);color:var(--color-text-muted)}.container{width:100%;max-width:720px}.card{background:var(--color-surface);border:1px solid rgba(0,0,0,.06);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:var(--space-6)}.primary-button{background:var(--color-accent-2);color:#fff;border:none;padding:var(--space-3) var(--space-5);font-size:16px;font-family:var(--font-body);border-radius:var(--radius-button);box-shadow:var(--shadow-button);cursor:pointer;transition:background-color .15s ease}.primary-button:hover{background:#0f3d89}.primary-button:focus-visible,.secondary-button:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.secondary-button{background:transparent;color:var(--color-accent-2);border:1px solid var(--color-accent-2);padding:var(--space-3) var(--space-5);font-family:var(--font-body);border-radius:var(--radius-button);cursor:pointer;transition:background-color .15s ease}.secondary-button:hover{background:#86cefa1a}.button-row{display:grid;grid-template-columns:1fr;gap:var(--space-3)}@media (min-width: 768px){.button-row{grid-template-columns:repeat(3,1fr)}}.muted{color:var(--color-text-muted)}.inline-spacer{width:var(--space-3);display:inline-block}.top-inset{margin-bottom:var(--space-4)}.result-overlay{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:flex-start;justify-content:center;background:#0003;padding:var(--space-6)}.result-card{width:100%;max-width:560px}.result-title{margin:0 0 var(--space-3) 0}.result-status{font-weight:700}.status-correct{color:var(--color-success)}.status-incorrect{color:var(--color-error)}.chart-card{overflow:hidden}@media (prefers-reduced-motion: no-preference){.pressable:active{transform:scale(.98)}}.about-panel{margin-top:var(--space-3)}.about-panel>summary{cursor:pointer;color:var(--color-accent-2);font-weight:600;margin-bottom:var(--space-2)}.about-panel-content{margin:var(--space-4);text-align:left;max-width:600px;margin-left:auto;margin-right:auto}.about-panel-content p{margin-bottom:var(--space-3)}.about-panel-content ul{list-style:disc;text-align:left;padding:10px 40px}a{color:var(--color-accent-2);text-decoration:underline;text-underline-offset:2px;transition:color .15s ease,text-decoration-thickness .15s ease}a:visited{color:var(--color-accent-2)}a:hover{text-decoration-thickness:2px}a:focus-visible,.about-panel>summary:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px;border-radius:2px}