/* Band Nine Renaissance — tokens from the design system (Vellum + Nocturne) */
:root {
  --paper: #f6f1e7; --surface: #fcf9f3; --ink: #1c1712; --muted: #625848; --line: #ddd3c0;
  --lapis: #22398a; --on-lapis: #f6f1e7; --tint: #e3e7f3; --gold: #9a7128;
  --good: #2c6a57; --bad: #ac3519;
  --n-paper: #14110d; --n-surface: #1e1914; --n-ink: #f1eadc; --n-muted: #b3a893; --n-line: #3a3229;
  --n-lapis: #93a8ef; --n-tint: #252e4c; --n-gold: #d4ab5a;
  --display: "Cormorant Garamond", "EB Garamond", Garamond, "Noto Serif HK", Georgia, serif;
  --reading: "EB Garamond", Garamond, "Noto Serif HK", Georgia, serif;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", "Noto Sans HK", sans-serif;
  --zh: "Noto Serif HK", "Noto Serif TC", serif;
  --raised: 0 6px 28px rgba(28, 23, 18, 0.08);
}
/* Account pages render inside #app; these rules stay inside it. */
#app, #app * { box-sizing: border-box; }
#app { color: var(--ink); font: 400 17px/25px var(--sans); letter-spacing: -0.01em; }
#app button, #app input, #app textarea, #app select { font: inherit; letter-spacing: inherit; }
#app a { color: var(--lapis); text-underline-offset: 3px; }
#app :focus-visible { outline: 2px solid var(--lapis); outline-offset: 3px; }
.boot { padding: 128px 32px; text-align: center; font-family: var(--display); font-size: 34px; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } }

/* type */
.kicker { margin: 0; font: 500 13px/16px var(--reading); letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.h-xl { margin: 16px 0 0; font: 500 clamp(52px, 8vw, 88px)/1 var(--display); letter-spacing: -0.02em; }
.h1 { margin: 16px 0 0; font: 500 clamp(44px, 6vw, 56px)/1.07 var(--display); letter-spacing: -0.015em; }
.h2 { margin: 0; font: 500 34px/40px var(--display); }
.h3 { margin: 0; font: 500 30px/34px var(--display); }
.stand { margin: 16px 0 0; max-width: 640px; font: italic 400 26px/34px var(--display); color: var(--muted); }
.reading { font: 400 19px/31px var(--reading); }
.zh { font-family: var(--zh); color: var(--muted); }
.small { font-size: 13px; line-height: 18px; color: var(--muted); }
.muted { color: var(--muted); }
.lead-rule { border-top: 2px solid var(--ink); padding-top: 24px; }
.num { font-variant-numeric: lining-nums tabular-nums; }

/* chapters */
.chapter { padding: clamp(64px, 10vw, 128px) 0; }
.noc { background: var(--n-paper); color: var(--n-ink); }
.noc .kicker, .noc .stand, .noc .muted { color: var(--n-muted); }
.noc .lead-rule { border-color: var(--n-ink); }
.noc .card { background: var(--n-surface); border-color: var(--n-line); color: var(--n-ink); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 11px 20px; border-radius: 980px; border: 1px solid var(--muted); background: transparent; color: var(--ink); font: 500 15px/20px var(--sans); cursor: pointer; text-decoration: none; transition: background-color .18s ease, border-color .18s ease, filter .18s ease; }
.btn:hover { background: var(--surface); border-color: var(--ink); }
.btn.pri { background: var(--lapis); border-color: var(--lapis); color: var(--on-lapis); }
.btn.pri:hover { filter: brightness(1.18); }
.btn.dark { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn.big { width: 100%; padding: 16px 26px; font-size: 17px; font-weight: 600; }
.btn.on { background: var(--lapis); border-color: var(--lapis); color: var(--on-lapis); }
.btn.sm { min-height: 36px; padding: 7px 14px; font-size: 14px; }
.btn.icon { width: 44px; padding: 0; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.noc .btn { color: var(--n-ink); border-color: var(--n-muted); }
.noc .btn:hover { background: var(--n-surface); border-color: var(--n-ink); }
.noc .btn.pri { background: var(--n-lapis); border-color: var(--n-lapis); color: var(--n-paper); }
.link { background: none; border: 0; padding: 8px 0; color: var(--lapis); font: 500 15px/20px var(--sans); cursor: pointer; }
.link:hover { text-decoration: underline; }
.chip { padding: 8px 14px; border-radius: 980px; border: 1px solid var(--muted); background: transparent; color: var(--ink); font: 400 14px/19px var(--sans); cursor: pointer; text-align: left; }
.chip.on { border-color: var(--lapis); background: var(--tint); color: var(--lapis); font-weight: 500; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.between { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }

/* header */
.top { border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-top: 14px; padding-bottom: 14px; }
.brand { background: none; border: 0; padding: 0; cursor: pointer; color: var(--ink); font: 600 28px/32px var(--display); }
.brand i { font-weight: 400; }
.nav { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.nav .btn { border-color: transparent; }
.nav .btn.cur { border-color: var(--ink); background: var(--surface); }
.soon { font-size: 11px; color: var(--muted); }
.badge { display: inline-flex; align-items: center; padding: 6px 12px; border-radius: 980px; background: var(--tint); color: var(--lapis); font: 500 13px/18px var(--sans); }
.badge.good { color: var(--good); }
.badge.bad { background: transparent; border: 1px solid var(--bad); color: var(--bad); }

/* cards & grids */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
.card.hover { transition: box-shadow .18s ease; }
.card.hover:hover { box-shadow: var(--raised); }
button.card { text-align: left; cursor: pointer; color: var(--ink); width: 100%; display: flex; flex-direction: column; gap: 8px; font: inherit; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 28px; padding: 32px; }
.plate { border-radius: 16px; background: var(--tint); display: flex; align-items: center; justify-content: center; font: italic 400 34px/40px var(--display); color: var(--lapis); }
.arch { border-radius: 999px 999px 0 0; }
.grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.grid.sm { gap: 12px; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.stack { display: flex; flex-direction: column; gap: 12px; }
.mt8 { margin-top: 8px; } .mt16 { margin-top: 16px; } .mt24 { margin-top: 24px; } .mt32 { margin-top: 32px; } .mt64 { margin-top: 64px; }
.fleuron { display: flex; align-items: center; justify-content: center; gap: 16px; color: var(--gold); font: 28px/28px var(--display); margin: 48px 0 24px; }
.fleuron::before, .fleuron::after { content: ""; width: 48px; height: 1px; background: var(--gold); }
.locked { background: var(--tint); border-radius: 28px; padding: 40px 32px; }

/* lists */
.qrow { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 14px 18px; display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.qrow .txt { flex: 1 1 300px; min-width: 0; }
.qrow .n { width: 24px; font-size: 13px; color: var(--muted); }
.err { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 8px 24px; }
.x { color: var(--bad); font-weight: 600; margin-right: 6px; }
.tick { color: var(--good); font-weight: 600; margin-right: 6px; }
.blank { color: var(--muted); border-bottom: 1px dashed var(--muted); }
.filled { color: var(--lapis); background: var(--tint); border-radius: 4px; padding: 0 4px; }
.beat { font: 500 13px/16px var(--reading); letter-spacing: .16em; color: var(--lapis); text-transform: uppercase; }

/* forms */
label.f { display: flex; flex-direction: column; gap: 6px; font: 500 15px/20px var(--sans); }
input.f, textarea.f, select.f { padding: 12px 14px; border-radius: 6px; border: 1px solid var(--muted); background: var(--paper); color: var(--ink); font-size: 16px; line-height: 24px; width: 100%; }
textarea.f { resize: vertical; }
.alert { padding: 12px 16px; border-radius: 6px; background: var(--tint); font-size: 15px; line-height: 22px; }
.alert.bad { background: transparent; border: 1px solid var(--bad); color: var(--bad); }
.alert.good { background: transparent; border: 1px solid var(--good); color: var(--good); }

/* tables */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 15px; line-height: 21px; }
.tbl th, .tbl td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl th { font: 500 13px/16px var(--reading); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); white-space: nowrap; }
.tbl tr:last-child td { border-bottom: 0; }

/* practice dialog */
.overlay { position: fixed; inset: 0; z-index: 50; background: rgba(20, 17, 13, .6); overflow-y: auto; padding: 32px 16px; }
.dialog { max-width: 760px; margin: 0 auto; background: var(--paper); border-radius: 28px; padding: clamp(24px, 4vw, 40px); }
.bar { height: 8px; border-radius: 980px; background: var(--line); overflow: hidden; margin-top: 12px; }
.bar > div { height: 100%; width: 0; background: var(--lapis); transition: width .25s linear; }
.dot { width: 12px; height: 12px; border-radius: 980px; background: var(--bad); animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .35; } }
.clock { font: 500 34px/40px var(--sans); font-variant-numeric: lining-nums tabular-nums; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }

footer { background: var(--n-paper); color: var(--n-muted); }
footer .wrap { padding-top: 64px; padding-bottom: 64px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; font-size: 13px; line-height: 18px; }
#toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--ink); color: var(--paper); padding: 12px 20px; border-radius: 980px; font-size: 15px; opacity: 0; pointer-events: none; transition: opacity .2s ease; z-index: 60; }
#toast.show { opacity: 1; }

/* class QR code (teacher dashboard) */
.bn-qr { position: fixed; inset: 0; z-index: 1000; background: rgba(20, 17, 13, 0.72); display: flex; align-items: center; justify-content: center; padding: 16px; overflow: auto; }
.bn-qr-in { background: #fcf9f3; border-radius: 20px; padding: 40px 32px; max-width: 560px; width: 100%; text-align: center; box-shadow: var(--raised); }
.bn-qr-code { margin: 24px auto 16px; width: min(360px, 100%); }
.bn-qr-code svg { width: 100%; height: auto; display: block; }
@media print {
  body * { visibility: hidden; }
  .bn-qr, .bn-qr * { visibility: visible; }
  .bn-qr { position: absolute; inset: 0; background: #fff; display: block; padding: 48px 0; }
  .bn-qr-in { box-shadow: none; margin: 0 auto; }
  .bn-qr-btns { display: none !important; }
}