:root { color-scheme: light dark; --ink: #1c1f23; --muted: #5d6670; --line: #d7dce1; --bg: #fff; --soft: #f3f5f7; --accent: #07625a; --cover: #fff3c4; --cover-ink: #5c4500; --bad: #9b1c1c; --ok: #1d6b2f; }
@media (prefers-color-scheme: dark) { :root { --ink: #e8eaed; --muted: #a3acb6; --line: #3a4048; --bg: #15181c; --soft: #1f2328; --accent: #5fd1c4; --cover: #4a3b0a; --cover-ink: #ffe28a; --bad: #ff9c9c; --ok: #8fe0a2; } }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.5rem; margin: 0 0 .5rem; line-height: 1.25; }
h2 { font-size: 1.1rem; margin: 1.5rem 0 .5rem; }
a { color: var(--accent); }
.school { margin: 0; color: var(--muted); font-size: .9rem; }
.muted { color: var(--muted); font-size: .9rem; }
.banner { background: var(--cover); color: var(--cover-ink); padding: .6rem .8rem; border-radius: 6px; }
.notice { background: var(--soft); padding: .6rem .8rem; border-radius: 6px; }
.error { color: var(--bad); font-weight: 600; }
.ok { color: var(--ok); font-weight: 600; }
.lesson { border: 1px solid var(--line); border-radius: 6px; padding: .5rem .7rem; margin: .4rem 0; display: flex; flex-wrap: wrap; gap: .1rem .6rem; align-items: baseline; }
.lesson s { display: contents; }
.lesson .when { color: var(--muted); font-size: .85rem; flex-basis: 100%; }
.lesson .what { font-weight: 600; }
.lesson .detail { color: var(--muted); font-size: .9rem; }
.lesson .tag { font-size: .8rem; }
.lesson.cover-taken { background: var(--cover); color: var(--cover-ink); border-color: var(--cover-ink); }
.lesson.cover-taken .detail, .lesson.cover-taken .when { color: inherit; }
.lesson.covered { opacity: .75; }
.lesson.covered .what, .lesson.covered .detail, .lesson.covered .when { text-decoration: line-through; }
.lesson.changed { border-color: var(--accent); }
.grid-scroll { overflow-x: auto; max-width: 100%; }
.grid { border-collapse: collapse; width: 100%; min-width: 520px; font-size: .8rem; }
.grid th, .grid td { border: 1px solid var(--line); padding: .25rem; vertical-align: top; text-align: left; }
.grid thead th { background: var(--soft); }
.grid .lesson { display: block; border: 0; padding: 0; margin: 0 0 .2rem; }
.grid .lesson .detail, .grid .lesson .tag { display: block; }
.grid .lesson.cover-taken { padding: .15rem; }
.grid .is-today { background: var(--soft); }
.grid .reserved { color: var(--muted); font-style: italic; }
.grid .closed { text-align: center; vertical-align: middle; color: var(--muted); }
form { margin: .75rem 0; }
label { display: block; margin: .5rem 0; font-weight: 600; font-size: .95rem; }
input, select, button { font: inherit; }
input, select { display: block; width: 100%; margin-top: .25rem; padding: .5rem; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--ink); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
button, .button { display: inline-block; padding: .55rem 1rem; border-radius: 6px; border: 1px solid var(--accent); background: var(--accent); color: var(--bg); cursor: pointer; text-decoration: none; }
button.secondary { background: transparent; color: var(--accent); }
button.small { padding: .3rem .6rem; font-size: .85rem; }
button.link { background: none; border: 0; color: var(--accent); padding: 0; text-decoration: underline; }
.inline { display: flex; gap: .5rem; align-items: end; }
.inline label { flex: 1; margin: 0; }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.actions form { margin: 0; }
.requests { list-style: none; padding: 0; }
.requests li { border-bottom: 1px solid var(--line); padding: .5rem 0; }
.status-pending { color: var(--muted); } .status-accepted { color: var(--ok); } .status-declined { color: var(--bad); }
.links { width: 100%; border-collapse: collapse; font-size: .85rem; }
.links td, .links th { border-bottom: 1px solid var(--line); padding: .35rem; text-align: left; vertical-align: top; }
.url { word-break: break-all; font-family: ui-monospace, Consolas, monospace; font-size: .8rem; }
.key { border: 2px solid var(--accent); border-radius: 8px; padding: .8rem; margin: 1rem 0; }
.key code { display: block; word-break: break-all; font-size: 1rem; padding: .5rem; background: var(--soft); border-radius: 4px; }
.facts { display: grid; grid-template-columns: max-content 1fr; gap: .25rem 1rem; }
.facts dt { color: var(--muted); } .facts dd { margin: 0; }
footer { margin-top: 2rem; }
.slip { border: 1px dashed var(--line); padding: 1rem; margin: 1rem 0; text-align: center; break-inside: avoid; }
.slip .qr { width: 60%; max-width: 240px; height: auto; display: block; margin: .5rem auto; }
@media print {
  :root { --ink: #000; --muted: #333; --bg: #fff; }
  .no-print { display: none; }
  .slips .slip { break-after: page; border: 0; }
}