:root { color-scheme: light; font: 16px/1.5 system-ui, sans-serif; background: #f4f6f9; color: #172033; }
body { margin: 0; } .shell { max-width: 820px; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }
.site-header { margin-bottom: 2rem; } .brand { margin: 0 0 .4rem; color: #2759c7; font-size: .85rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; } .brand span { color: #63708a; } h1, h2, h3 { line-height: 1.2; } h1 { margin: 0; font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -.03em; } h2 { margin: .2rem 0 .75rem; font-size: 1.5rem; } h3 { margin: 0 0 .8rem; font-size: 1.05rem; } .subtitle { max-width: 42rem; margin: .7rem 0 0; color: #63708a; font-size: 1.05rem; }
.card { background: white; border: 1px solid #d6dce8; border-radius: 16px; padding: clamp(1.25rem, 4vw, 2rem); margin: 1rem 0; box-shadow: 0 10px 30px #1720330d; } .eyebrow { margin: 0; color: #2759c7; font-size: .78rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
label { display: block; margin: 1rem 0; font-weight: 650; } input, textarea, select { box-sizing: border-box; display: block; width: 100%; margin-top: .4rem; padding: .75rem .8rem; border: 1px solid #b8c2d4; border-radius: 8px; background: #fff; color: inherit; font: inherit; } textarea { resize: vertical; } .inline { display: flex; gap: .55rem; align-items: center; font-weight: 500; } .inline input { width: auto; margin: 0; }
button { cursor: pointer; border: 0; border-radius: 8px; padding: .75rem 1rem; margin: .25rem .4rem .25rem 0; background: #2759c7; color: white; font: inherit; font-weight: 750; } button:hover:not(:disabled) { background: #1f48a5; } button:disabled { opacity: .5; cursor: not-allowed; } .button-secondary { background: #e8edf7; color: #172033; } .button-row { display: flex; flex-wrap: wrap; gap: .35rem; }
.explore-link { display: inline-block; margin: .25rem 0 1rem; padding: .75rem 1rem; border-radius: 8px; background: #172033; color: white; text-decoration: none; font-weight: 750; } .explore-link:hover { background: #2c3952; }
.hidden { display: none; } .muted, .status { color: #63708a; } .status { min-height: 1.5em; margin: .7rem 0 0; } .session-code { padding: .8rem 1rem; border-radius: 8px; background: #eef3ff; color: #274078; } .session-code strong { letter-spacing: .12em; } .section-block { margin-top: 1.75rem; padding-top: 1.5rem; border-top: 1px solid #e3e7ef; }
.board { min-height: 6rem; white-space: pre-wrap; padding: 1rem; background: #fffbea; border: 1px solid #eadba1; border-radius: 8px; } article { margin-top: 1.75rem; padding-top: 1.5rem; border-top: 1px solid #e3e7ef; } .media-slot video, .media-slot audio { display: block; max-width: 100%; width: 100%; } pre { white-space: pre-wrap; overflow-x: auto; background: #f4f6fa; padding: 1rem; border-radius: 8px; } :focus-visible { outline: 3px solid #f0a84b; outline-offset: 2px; }
@media (max-width: 540px) { .shell { padding: 1.5rem .9rem 3rem; } .card { border-radius: 12px; } button { width: 100%; margin-right: 0; } .button-row { display: block; } }