:root {
  --bg: #14161a;
  --panel: #1c1f25;
  --line: #2b3038;
  --fg: #e8eaed;
  --dim: #9aa2ad;
  --ok: #5fd08a;
  --bad: #f2777a;
  --accent: #7aa2f7;
  --third: #7aa2f7;
  --seventh: #e0af68;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 34rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

h1 { font-size: 1.3rem; margin: 0 0 .5rem; }
h2 { font-size: 1.05rem; margin: 0 0 .35rem; }

.lede, .note { color: var(--dim); font-size: .9rem; }
.note { margin-top: 2rem; }
.watch { color: var(--accent); font-size: .82rem; margin-bottom: 0; }

code {
  background: var(--panel);
  padding: .1em .35em;
  border-radius: .25rem;
  font-size: .85em;
}

.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: .6rem;
  padding: 1rem;
  margin: 1rem 0;
  text-decoration: none;
  color: inherit;
}
.card p { font-size: .88rem; color: var(--dim); }
.card:active { border-color: var(--accent); }

/* ---- drill surface ---- */

.status {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: .5rem;
  padding: .6rem .75rem;
  font-size: .82rem;
  color: var(--dim);
  margin-bottom: 1rem;
}
.status b { color: var(--fg); font-weight: 600; }

.target {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: .6rem;
  padding: 2rem 1rem;
  text-align: center;
  margin-bottom: 1rem;
}
.target .label {
  font-size: .75rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--dim);
}
.target .value {
  font-size: 3.2rem;
  font-weight: 600;
  line-height: 1.1;
  margin-top: .4rem;
  font-variant-ligatures: none;
}
.target.hit { border-color: var(--ok); }
.target.miss { border-color: var(--bad); }

.heard {
  min-height: 1.4rem;
  text-align: center;
  color: var(--dim);
  font-size: .9rem;
  margin-bottom: 1rem;
}
.heard .ok { color: var(--ok); }
.heard .no { color: var(--bad); }

.level {
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 1rem;
}
.level > i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
}

button {
  font: inherit;
  color: var(--fg);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: .5rem;
  padding: .8rem 1rem;
  min-height: 3rem;
  cursor: pointer;
}
button:active { border-color: var(--accent); }
button[disabled] { opacity: .45; }

.row { display: flex; gap: .5rem; flex-wrap: wrap; }
.row > button { flex: 1 1 8rem; }

button.inline {
  min-height: 2rem;
  padding: .3rem .6rem;
  font-size: .8rem;
}

.small { font-size: .78rem; }

.stats {
  display: flex;
  gap: .5rem;
  margin: 1.25rem 0 .5rem;
  flex-wrap: wrap;
}
.stat {
  flex: 1 1 5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: .5rem;
  padding: .6rem;
  text-align: center;
}
.stat .k { font-size: .68rem; text-transform: uppercase; letter-spacing: .08em; color: var(--dim); }
.stat .v { font-size: 1.25rem; font-weight: 600; }

table { width: 100%; border-collapse: collapse; font-size: .8rem; margin-top: .75rem; }
th, td { text-align: left; padding: .35rem .3rem; border-bottom: 1px solid var(--line); }
th { color: var(--dim); font-weight: 500; font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; }
td.no { color: var(--bad); }
td.ok { color: var(--ok); }

.back { color: var(--dim); font-size: .85rem; text-decoration: none; }
.back:active { color: var(--accent); }

.warn {
  border: 1px solid var(--bad);
  color: var(--bad);
  border-radius: .5rem;
  padding: .6rem .75rem;
  font-size: .85rem;
  margin-bottom: 1rem;
}

.dim { color: var(--dim); }

.field {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: 1rem;
}
.field > span {
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--dim);
}
.field > select {
  flex: 1;
  font: inherit;
  font-size: .9rem;
  color: var(--fg);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: .5rem;
  padding: .6rem .5rem;
  min-height: 2.75rem;
}
.field > select:disabled { opacity: .5; }

.byletter {
  display: flex;
  flex-wrap: wrap;
  gap: .2rem .55rem;
  font-size: .82rem;
  font-variant-numeric: tabular-nums;
  color: var(--dim);
  margin: .25rem 0 .5rem;
}
.byletter .ok { color: var(--ok); }
.byletter .no { color: var(--bad); }
.byletter small { opacity: .6; }

/* ---- review schedule boxes ---- */

.boxes {
  display: flex;
  gap: .3rem;
  margin: 1rem 0 .5rem;
}
.boxes > span {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: .4rem;
  padding: .4rem .2rem;
  text-align: center;
  font-size: .62rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--dim);
}
.boxes > span > b {
  display: block;
  font-size: 1.05rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}
.boxes > span.ok { border-color: var(--ok); }
.boxes > span.ok > b { color: var(--ok); }

.target .value + .label { margin-top: .5rem; }