/* Teachers open this on a phone between classes and on an old school laptop.
   No framework, no build step — just careful defaults. */

:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --ink: #16202c;
  --ink-soft: #5a6572;
  --dim: #8590a0;
  --line: #e2e7ee;
  --line-soft: #eef1f6;
  --accent: #1b4f8f;
  --accent-dark: #16406f;
  --accent-soft: #eaf1fa;
  --ok: #12704a;
  --ok-bg: #e6f5ee;
  --warn: #9c3220;
  --warn-bg: #fdeeeb;
  --shadow: 0 1px 2px rgba(20, 33, 48, .06), 0 4px 14px rgba(20, 33, 48, .05);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* An element with [hidden] must stay hidden even when a class sets display.
   Without this the "my own pattern" mark boxes showed alongside the board
   pattern, because `.marks { display: flex }` outranks the attribute. */
[hidden] { display: none !important; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ----------------------------------------------------------------- top bar */
.topbar {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 22px;
  height: 58px;
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand {
  display: flex; align-items: center; gap: 9px;
  font-weight: 700; font-size: 17px; letter-spacing: -.2px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.mark {
  width: 28px; height: 28px; border-radius: 7px;
  background: var(--accent); color: #fff;
  display: grid; place-items: center;
  font-size: 13px; font-weight: 700; letter-spacing: -.5px;
}
.topbar nav { display: flex; gap: 4px; }
.topbar nav a {
  padding: 7px 12px; border-radius: 7px;
  color: var(--ink-soft); font-size: 15px;
}
.topbar nav a:hover { background: var(--line-soft); text-decoration: none; }
.topbar nav a.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.who {
  margin-left: auto; display: flex; gap: 14px; align-items: center;
  font-size: 14px; color: var(--dim);
}
.who .out { color: var(--ink-soft); }

/* ------------------------------------------------------------------ layout */
.wrap { max-width: 760px; margin: 0 auto; padding: 30px 20px 70px; }
.wrap.narrow { max-width: 400px; padding-top: 9vh; }

h1 { font-size: 26px; line-height: 1.25; margin: 0 0 6px; letter-spacing: -.4px; }
h2 { font-size: 17px; margin: 34px 0 12px; letter-spacing: -.2px; }
.lede { color: var(--ink-soft); margin: 0 0 22px; }
.dim { color: var(--dim); }
.hint { color: var(--dim); font-size: 14px; margin: 8px 0 0; line-height: 1.45; }
.right { text-align: right; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px;
  box-shadow: var(--shadow);
}

/* ------------------------------------------------------------------- forms */
label { display: block; margin-bottom: 14px; }
.lbl {
  display: block; font-size: 13px; font-weight: 600; color: var(--ink-soft);
  margin-bottom: 5px; letter-spacing: .1px;
}
input[type=text], input[type=email], input[type=password],
input[type=number], select {
  display: block; width: 100%; padding: 10px 12px;
  font: inherit; color: var(--ink);
  border: 1px solid var(--line); border-radius: 8px; background: #fff;
  transition: border-color .12s, box-shadow .12s;
}
input::placeholder { color: #b3bcc8; }
input:focus, select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row .grow { flex: 1 1 240px; margin-bottom: 14px; }
.row .fixed { flex: 0 0 150px; margin-bottom: 14px; }

.group { border-top: 1px solid var(--line-soft); padding-top: 18px; margin-top: 4px; }
.group-title { font-size: 13px; font-weight: 700; color: var(--ink);
  letter-spacing: .3px; text-transform: uppercase; margin-bottom: 12px; }

/* Pattern chooser -------------------------------------------------------- */
.choice {
  display: flex; gap: 11px; align-items: flex-start;
  border: 1px solid var(--line); border-radius: 10px;
  padding: 13px 15px; margin-bottom: 10px; cursor: pointer;
  transition: border-color .12s, background .12s;
}
.choice:hover { border-color: #c9d3e0; }
.choice:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.choice input { margin: 3px 0 0; accent-color: var(--accent); }
.choice b { display: block; font-size: 15px; margin-bottom: 1px; }
.choice span.desc { font-size: 14px; color: var(--ink-soft); }

.panel { margin: -2px 0 14px 32px; }
.marks { display: flex; gap: 10px; flex-wrap: wrap; }
.marks label { width: 88px; margin-bottom: 0; }
.marks input { text-align: center; padding: 8px 6px; }

/* Chapter chips ---------------------------------------------------------- */
.chapters { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 7px; margin: 0;
  border: 1px solid var(--line); border-radius: 22px;
  padding: 6px 13px 6px 10px; font-size: 14px; color: var(--ink);
  background: #fff; cursor: pointer; user-select: none;
  transition: border-color .12s, background .12s;
}
.chip:hover { border-color: #c9d3e0; }
.chip:has(input:checked) {
  border-color: var(--accent); background: var(--accent-soft);
  color: var(--accent); font-weight: 600;
}
.chip input { margin: 0; accent-color: var(--accent); }

/* Buttons ---------------------------------------------------------------- */
button, .button {
  font: inherit; font-weight: 600; padding: 10px 18px; border-radius: 9px;
  cursor: pointer; border: 1px solid var(--line); background: #fff;
  color: var(--ink); display: inline-block; text-align: center;
  transition: background .12s, border-color .12s, transform .06s;
}
button:hover, .button:hover { border-color: #c9d3e0; text-decoration: none; }
button:active, .button:active { transform: translateY(1px); }
.primary {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.big { padding: 13px 28px; font-size: 16px; width: 100%; }

/* Messages --------------------------------------------------------------- */
.alert {
  background: var(--warn-bg); border: 1px solid #f2c4bb; color: var(--warn);
  padding: 11px 14px; border-radius: 9px; margin-bottom: 16px; font-size: 15px;
}
.note {
  background: #fffaeb; border: 1px solid #edd9a3; border-radius: 10px;
  padding: 13px 15px; margin-top: 20px; font-size: 15px;
}
.note ul { margin: 7px 0 0 18px; padding: 0; }

/* Lists ------------------------------------------------------------------ */
table.list { width: 100%; border-collapse: collapse; font-size: 15px; }
table.list th {
  text-align: left; font-size: 12px; color: var(--dim); font-weight: 700;
  text-transform: uppercase; letter-spacing: .4px;
  border-bottom: 1px solid var(--line); padding: 7px 10px;
}
table.list td { padding: 11px 10px; border-bottom: 1px solid var(--line-soft); }
table.list tr:last-child td { border-bottom: 0; }
table.list a { font-weight: 600; }

.status {
  font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 20px;
  background: #eef1f5; color: var(--ink-soft); white-space: nowrap;
  text-transform: capitalize;
}
.status.ready, .status.paper_ready { background: var(--ok-bg); color: var(--ok); }
.status.failed { background: var(--warn-bg); color: var(--warn); }

/* Progress --------------------------------------------------------------- */
/* Indeterminate on purpose: the render takes about ten seconds and there is no
   honest percentage to show, so the bar sweeps rather than pretending. */
.bar {
  height: 5px; background: #e6eaf0; border-radius: 4px; overflow: hidden;
  margin-bottom: 14px;
}
.bar .fill {
  height: 100%; width: 35%; background: var(--accent); border-radius: 4px;
  animation: sweep 1.3s ease-in-out infinite;
}
@keyframes sweep {
  0%   { margin-left: -35%; }
  100% { margin-left: 100%; }
}

.downloads { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* Login ------------------------------------------------------------------ */
.login-head { text-align: center; margin-bottom: 22px; }
.login-head .mark { width: 40px; height: 40px; font-size: 17px; margin: 0 auto 12px; }
.login-head h1 { font-size: 21px; margin-bottom: 3px; }
.login-head p { margin: 0; color: var(--dim); font-size: 14px; }

@media (max-width: 620px) {
  .topbar { gap: 12px; padding: 0 14px; }
  .who span.name { display: none; }
  .wrap { padding: 22px 14px 60px; }
  h1 { font-size: 22px; }
  .marks label { width: calc(33.333% - 7px); }
  .row .fixed { flex: 1 1 140px; }
}