/* Studyhelper design system */
:root {
  --bg: #F7F6F2;
  --panel: #FFFFFF;
  --ink: #24303C;
  --muted: #66727E;
  --line: #E2E0D8;
  --accent: #1B6E8C;
  --accent-ink: #FFFFFF;
  --ok: #2E7D46;
  --warn: #A85B00;
  --danger: #B33A3A;
  --banner: #FFF3C4;
  --banner-ink: #5C4A00;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151C24;
    --panel: #1E2833;
    --ink: #E8EAEC;
    --muted: #93A0AC;
    --line: #2C3843;
    --accent: #58AFCF;
    --accent-ink: #0D1620;
    --banner: #4A3E10;
    --banner-ink: #F5E9B8;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}
.container { max-width: 62rem; margin: 0 auto; padding: 1.2rem; }
.narrow { max-width: 34rem; margin: 0 auto; }
a { color: var(--accent); }
h1 { font-size: 1.7rem; margin: .6rem 0 1rem; }
h2 { font-size: 1.2rem; margin: 1.4rem 0 .6rem; }
h3 { font-size: 1.02rem; margin: 1rem 0 .3rem; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }
.inline { display: inline; }

/* Topbar */
.topbar {
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
  background: var(--panel); border-bottom: 1px solid var(--line);
  padding: .5rem 1rem;
}
.brand { font-weight: 700; text-decoration: none; color: var(--ink); font-size: 1.1rem; }
.topbar nav { display: flex; gap: .2rem; flex-wrap: wrap; flex: 1; }
.navlink {
  text-decoration: none; color: var(--ink); padding: .35rem .6rem;
  border-radius: 8px; font-size: .95rem;
}
.navlink:hover { background: var(--bg); }
.topbar-right { display: flex; align-items: center; gap: .5rem; }
.username { color: var(--muted); font-size: .9rem; }

/* Cards & layout */
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1rem 1.2rem; margin: .8rem 0;
}
.cardgrid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: .9rem;
}
.cardgrid .card { margin: 0; }
.card.action { text-decoration: none; color: var(--ink); transition: transform .1s; display: block; }
.card.action:hover { transform: translateY(-2px); border-color: var(--accent); }
.card .emoji { font-size: 2rem; }
.stack { display: flex; flex-direction: column; gap: .7rem; }
.row { display: flex; gap: .8rem; flex-wrap: wrap; }
.row > label { flex: 1; min-width: 8rem; }
label { display: flex; flex-direction: column; gap: .25rem; font-size: .93rem; }
label.choice { flex-direction: row; align-items: center; gap: .5rem; }
input, select, textarea {
  font: inherit; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; padding: .5rem .6rem;
}
input:focus, select:focus, textarea:focus, button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
button, .button {
  font: inherit; cursor: pointer; border-radius: 8px; text-decoration: none;
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  padding: .5rem .9rem; display: inline-block;
}
button.primary, .button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.big { font-size: 1.15rem; padding: .7rem 1.4rem; }
button.ghost { border: none; background: none; color: var(--muted); padding: .3rem .5rem; }
button.small { font-size: .85rem; padding: .25rem .5rem; }
.button.warn, button.warn { border-color: var(--warn); color: var(--warn); }
.button.ok, button.ok { border-color: var(--ok); color: var(--ok); }
.button.danger, button.danger { border-color: var(--danger); color: var(--danger); }
.btnrow { display: flex; gap: .5rem; flex-wrap: wrap; margin: .4rem 0; }

.badge {
  display: inline-block; background: var(--bg); border: 1px solid var(--line);
  border-radius: 99px; padding: .05rem .6rem; font-size: .8rem; vertical-align: middle;
}
.badge.ok { color: var(--ok); border-color: var(--ok); }
.badge.warn { color: var(--warn); border-color: var(--warn); }
.banner {
  background: var(--banner); color: var(--banner-ink);
  border-radius: var(--radius); padding: .6rem 1rem; margin: .8rem 0;
}
.banner.small { font-size: .85rem; padding: .3rem .6rem; }
.alert {
  background: #FBE6E6; color: #7C2222; border-radius: var(--radius);
  padding: .6rem 1rem; margin: .8rem 0;
}
@media (prefers-color-scheme: dark) { .alert { background: #4A1D1D; color: #F3C2C2; } }
.list { padding-left: 1.1rem; }
.list li { margin: .3rem 0; }
.table { border-collapse: collapse; width: 100%; }
.table th { text-align: left; border-bottom: 2px solid var(--line); padding: .4rem .5rem; font-size: .85rem; color: var(--muted); }
.table td { border-bottom: 1px solid var(--line); padding: .45rem .5rem; vertical-align: top; }
.table.small { font-size: .85rem; }
.row-ok { background: color-mix(in srgb, var(--ok) 7%, transparent); }
.row-bad { background: color-mix(in srgb, var(--danger) 7%, transparent); }

/* Grades */
.grade-big { font-size: 4rem; font-weight: 800; }
.grade-A, .grade-9 { color: #1E8449; }
.grade-B, .grade-8 { color: #2E9E5B; }
.grade-C, .grade-7, .grade-6 { color: #B7950B; }
.grade-D, .grade-5, .grade-4 { color: #CA6F1E; }
.grade-E, .grade-3, .grade-2 { color: #BA4A00; }
.grade-F, .grade-1 { color: #B33A3A; }
.meter { background: var(--bg); border: 1px solid var(--line); border-radius: 99px; height: .7rem; width: 10rem; display: inline-block; vertical-align: middle; margin-right: .5rem; }
.meter-fill { background: var(--accent); height: 100%; border-radius: 99px; }

/* Login */
.login-wrap { max-width: 26rem; margin: 3rem auto; }
.login-logo { text-align: center; font-size: 2rem; }
.kid-picker { display: flex; flex-wrap: wrap; gap: .5rem; }
.kid-choice { flex-direction: row; align-items: center; border: 1px solid var(--line); border-radius: var(--radius); padding: .6rem .8rem; cursor: pointer; font-size: 1.05rem; }
.kid-choice:has(input:checked) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.pin-input { font-size: 1.6rem; letter-spacing: .5rem; text-align: center; }

/* Chat */
.chatlog { display: flex; flex-direction: column; gap: .6rem; margin: 1rem 0; min-height: 8rem; }
.msg { display: flex; }
.msg.user { justify-content: flex-end; }
.bubble {
  max-width: 46rem; padding: .55rem .9rem; border-radius: 14px;
  background: var(--panel); border: 1px solid var(--line); white-space: pre-wrap;
}
.msg.user .bubble { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.chatinput { display: flex; gap: .5rem; align-items: flex-end; position: sticky; bottom: 0; background: var(--bg); padding: .5rem 0; }
.chatinput textarea { flex: 1; resize: vertical; }
#recbtn.recording { background: var(--danger); color: #fff; border-color: var(--danger); }
.speakbtn { border: none; background: none; cursor: pointer; font-size: .95rem; opacity: .6; }
.speakbtn:hover { opacity: 1; }
.chat-img { display: block; max-width: 280px; max-height: 280px; border-radius: 10px; margin-top: .5rem; }
.chat-file { margin-top: .4rem; font-size: .88rem; opacity: .85; }
.attach-preview { display: flex; gap: .4rem; flex-wrap: wrap; }
.attach-chip {
  display: inline-flex; align-items: center; gap: .2rem;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 99px; padding: .15rem .6rem; font-size: .85rem;
}

/* Drills */
.drill-question { font-size: 2.6rem; text-align: center; margin: 1rem 0; word-break: break-word; }
.drill-answerrow { display: flex; gap: .6rem; justify-content: center; }
.drill-answerrow input { font-size: 1.8rem; width: 9rem; text-align: center; }
.drill-options { display: flex; gap: .7rem; justify-content: center; flex-wrap: wrap; }
.drill-options button { font-size: 1.8rem; min-width: 4rem; padding: .8rem 1.2rem; }
.drill-feedback { text-align: center; font-size: 1.2rem; min-height: 2rem; margin-top: .8rem; }
.drill-progress { text-align: center; color: var(--muted); margin: .5rem; }
.drill-score { font-size: 2rem; margin: 1rem; }
.tables-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: .3rem; }
.tbl { flex-direction: row; align-items: center; gap: .3rem; border: 1px solid var(--line); border-radius: 8px; padding: .3rem .5rem; justify-content: center; cursor: pointer; }
.tbl:has(input:checked) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.clockface { display: block; margin: 0 auto; }

/* Kid mode: bigger everything */
.kid-mode { font-size: 19px; }
.kid-mode .drill-question { font-size: 3.6rem; }
.kid-mode button.primary { font-size: 1.3rem; }
.kid-mode .card .emoji { font-size: 3rem; }

/* Cards review */
.card-face { font-size: 1.9rem; margin: 1.2rem 0; min-height: 3rem; }
.card-face.back { color: var(--accent); }
.card-grades { display: flex; gap: .6rem; justify-content: center; flex-wrap: wrap; }

/* Workbook ask */
.askanswer { margin-top: .8rem; white-space: pre-wrap; }
.askanswer .cites { margin-top: .6rem; font-size: .85rem; color: var(--muted); }

/* Prov */
.question .qhead { margin-bottom: .5rem; }
#timer.low { background: #F8D7DA; color: #842029; }

.inactive { opacity: .65; }
@media (max-width: 640px) {
  .topbar nav { order: 3; width: 100%; }
  .drill-question { font-size: 2rem; }
}