:root { color-scheme: dark; font-family: system-ui, sans-serif; background: #101923; color: #e7edf3; line-height: 1.6; }
* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 760px; margin: auto; padding: 24px; }
header { border-bottom: 1px solid #405363; } header a { font-size: 1.5rem; font-weight: 700; letter-spacing: .15em; }
a { color: #82daca; } h1 { font-size: clamp(1.5rem, 5vw, 2rem); line-height: 1.3; }
.notice, .hint { color: #bdcbd8; font-size: .9rem; } .notice { border-left: 3px solid #82daca; padding-left: 12px; }
fieldset { border: 1px solid #536674; border-radius: 8px; margin: 20px 0; padding: 16px; }
label { display: block; margin: 12px 0; } input[type=number] { display: block; padding: 10px; width: 120px; font: inherit; }
button { min-height: 48px; padding: 12px 18px; margin: 8px 0; border: 1px solid #82daca; border-radius: 7px; background: #1b3a40; color: #fff; font: inherit; cursor: pointer; }
button:hover { background: #28535a; } :focus-visible { outline: 3px solid #f7cb76; outline-offset: 4px; }
.grades { display: flex; flex-wrap: wrap; gap: 10px; } .grades button { flex: 1 1 120px; }
.answer { background: #1c2b39; padding: 20px; border-radius: 8px; } .answer p { white-space: pre-wrap; } summary { cursor: pointer; min-height: 44px; }
input:not([type=checkbox]):not([type=hidden]) { display: block; padding: 10px; max-width: 100%; font: inherit; }
nav { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
table { width: 100%; border-collapse: collapse; }
caption { text-align: left; color: #bdcbd8; margin-bottom: 8px; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid #405363; }
.statistics { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 16px; }
.statistics dd { margin: 0; font-weight: bold; }
.cas { background: #000; border: 1px solid #536674; border-radius: 8px; padding: 16px; }
.cas h2 { font-size: 1rem; margin: 0 0 8px; }
.cas p { font-family: ui-monospace, monospace; white-space: pre-wrap; overflow-wrap: anywhere; margin: 4px 0; }
.cas-red { color: #ff6666; } .cas-amber { color: #ffcc55; }
.cas-cyan { color: #66e5ff; } .cas-white { color: #fff; }
.cas-green { color: #77ee99; } .cas-magenta { color: #f299ff; }
.cas-bold { font-weight: 700; }
@media (max-width: 400px) { main { padding: 16px; } th, td { padding: 6px 4px; } }

select { max-width: 100%; min-height: 48px; font: inherit; padding: 8px; }