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var(--color-border);background:var(--color-bg-elevated);box-shadow:0 2px 0 var(--color-border)}.btn-ghost:hover{border-color:var(--color-accent);color:var(--color-accent)}.btn-ghost:active{transform:translateY(2px);box-shadow:0 0 0 var(--color-border)}.chapter-header{background:var(--color-bg-elevated);border:1.5px solid var(--color-border);border-radius:var(--radius);padding:1.4rem 1.5rem;box-shadow:none}.chapter-header .theme{display:inline-block;padding:.2rem .7rem;border-radius:999px;background:var(--color-accent-soft);color:var(--color-accent);font-size:.72rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase}.quiz{border-radius:var(--radius);border:1.5px solid var(--color-border);box-shadow:none}.quiz-progress-bar{height:10px;border-radius:999px;overflow:hidden;background:var(--color-accent-soft)}.quiz-progress-bar .fill{border-radius:999px;background:var(--color-accent);transition:width .35s cubic-bezier(.22,1,.36,1)}.quiz-question h2{font-size:1.35rem}.quiz-option{position:relative;border-radius:var(--radius);border:1.5px solid var(--color-border);padding:.85rem 1rem;transition:border-color .16s ease,background .16s ease,transform .16s ease}.quiz-option:hover{transform:translate(2px);border-color:var(--color-accent)}.quiz-option .letter{width:2rem;height:2rem;border-radius:50%;display:grid;place-items:center;font-weight:800;font-family:var(--font-display);background:var(--color-accent-soft);color:var(--color-accent);flex:none;transition:background .16s ease,color .16s ease}.quiz-option input{position:absolute;width:1px;height:1px;opacity:0;margin:0;pointer-events:none}.quiz-option:has(input:checked):not([data-state]){border-color:var(--color-accent);background:var(--color-accent-soft)}.quiz-option:has(input:checked):not([data-state]) .letter{background:var(--color-accent);color:var(--color-on-accent)}@media(forced-colors:active){.quiz-option input{position:static;width:auto;height:auto;opacity:1;pointer-events:auto}}.quiz-option[data-state=correct]{border-color:var(--color-success);background:var(--color-success-soft)}.quiz-option[data-state=correct] .letter{background:var(--color-success);color:#fff}.quiz-option[data-state=wrong]{border-color:var(--color-danger);background:var(--color-danger-soft)}.quiz-option[data-state=wrong] .letter{background:var(--color-danger);color:#fff}.quiz-option[data-state=missed]{border-color:var(--color-success);border-style:dashed;background:var(--color-success-soft)}.quiz-option[data-state=missed] .letter{background:var(--color-success);color:#fff}.quiz-feedback{border-radius:var(--radius);border-left-width:5px;border-left-style:solid}.quiz-explanation{border-radius:var(--radius);background:var(--color-accent-soft)}.quiz-explanation .label{font-family:var(--font-display);font-weight:700}.quiz-summary .score{font-family:var(--font-display);font-size:clamp(2.6rem,2rem + 3vw,4rem);font-weight:800;color:var(--color-accent);line-height:1.05}.site-footer{border-top:1px solid var(--color-border);font-size:.9rem}@media(prefers-reduced-motion:reduce){.card:hover,.btn-primary:hover,.quiz-option:hover{transform:none}*{transition-duration:.01ms!important}}@media(max-width:720px){.site-header .container{height:auto;flex-direction:column;align-items:stretch;gap:.35rem;padding-top:.55rem;padding-bottom:.45rem}.site-header .brand{white-space:nowrap;font-size:1.1rem}.site-header nav{gap:.2rem;overflow-x:auto;scrollbar-width:none;margin:0 -1.25rem;padding:0 1.25rem}.site-header nav::-webkit-scrollbar{display:none}.site-header nav a{white-space:nowrap}}.theme-heading{display:flex;align-items:center;gap:.85rem;margin:2.25rem 0 .85rem;font-family:var(--font-display);font-size:1.1rem;font-weight:700;letter-spacing:0;text-transform:none;color:var(--color-text)}.theme-heading:after{content:"";flex:1;height:1.5px;background:var(--color-border)}