/* Roll Call — a plain, fast attendance register.
   Palette: paper white, ink graphite, ledger green (present), rust (absent/error). */

:root {
  --paper: #FAFAF7;
  --paper-line: #E7E4DC;
  --ink: #23292B;
  --ink-soft: #6B7270;
  --line: #DEDAD0;
  --green: #2F6F4E;
  --green-soft: #E7F1EC;
  --rust: #B4533C;
  --rust-soft: #F7E9E5;
  --card-bg: #FFFFFF;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(35, 41, 43, 0.06), 0 1px 12px rgba(35, 41, 43, 0.04);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px 80px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 9px;
  background: var(--green);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  flex-shrink: 0;
}

.brand h1 {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 1px 0 0;
  font-size: 12.5px;
  color: var(--ink-soft);
}

.link {
  color: var(--green);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.link:hover { text-decoration: underline; }
.link.small { font-size: 12.5px; font-weight: 500; margin-left: 10px; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}
.card.no-pad { padding: 0; overflow: hidden; }
.card.highlight { border-color: var(--green); }
.card.sticky-card { position: sticky; top: 10px; z-index: 5; }

.card h2 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.card-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.muted { color: var(--ink-soft); font-size: 13.5px; margin: 0; }
.muted.small { font-size: 12px; margin-top: 8px; }

/* ---------- notices ---------- */
.notice {
  padding: 11px 14px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 14px;
}
.notice-success { background: var(--green-soft); color: var(--green); }
.notice-error { background: var(--rust-soft); color: var(--rust); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  padding: 10px 16px;
  transition: transform 0.05s ease, background 0.15s ease;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: #275f42; }
.btn-secondary { background: var(--ink); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { background: var(--paper-line); }
.btn-small { padding: 7px 12px; font-size: 12.5px; }
.btn-large { padding: 14px 20px; font-size: 15.5px; width: 100%; }

/* ---------- upload ---------- */
.upload-form { display: flex; flex-direction: column; gap: 12px; margin-top: 14px; }
.file-drop {
  border: 1.5px dashed var(--line);
  border-radius: 8px;
  padding: 18px;
  text-align: center;
  font-size: 13.5px;
  color: var(--ink-soft);
  cursor: pointer;
  background: var(--paper);
}
.file-drop:hover { border-color: var(--green); color: var(--ink); }
.file-drop input { display: none; }

.replace-box { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.replace-box.hidden { display: none; }

/* ---------- date form ---------- */
.date-form {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
  flex-wrap: wrap;
}
.date-form label { font-size: 13.5px; font-weight: 600; color: var(--ink-soft); }
.date-form input[type="date"] {
  flex: 1;
  min-width: 140px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  background: var(--paper);
}
.date-form.small-form { margin: 0; }

/* ---------- history date list ---------- */
.date-list { list-style: none; margin: 12px 0 0; padding: 0; }
.date-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 2px;
  border-bottom: 1px solid var(--paper-line);
  font-size: 14px;
}
.date-list li:last-child { border-bottom: none; }

/* ---------- register head ---------- */
.register-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}
.register-head h2 { font-size: 16px; }

.toolbar {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
  align-items: center;
}
.search-box {
  flex: 1;
  min-width: 160px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 14px;
  font-family: inherit;
  background: var(--paper);
}
.toolbar-actions { display: flex; gap: 8px; }

/* ---------- roster (the ledger) ---------- */
.roster {
  list-style: none;
  margin: 0;
  padding: 0;
  background: repeating-linear-gradient(
    to bottom,
    var(--card-bg) 0,
    var(--card-bg) 55px,
    var(--paper-line) 56px
  );
}

.roster-row {
  border-bottom: none;
}

.roster-label {
  display: grid;
  grid-template-columns: 28px 60px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  height: 32px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.roster-label input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 28px;
  height: 28px;
  margin: 0;
  cursor: pointer;
}

.check-visual {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  border: 2px solid var(--line);
  background: var(--card-bg);
  position: relative;
  flex-shrink: 0;
  transition: background 0.12s ease, border-color 0.12s ease;
}
.check-visual::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 11px;
  border: solid #fff;
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
  opacity: 0;
}
input:checked ~ .check-visual {
  background: var(--green);
  border-color: var(--green);
}
input:checked ~ .check-visual::after { opacity: 1; }
input:focus-visible ~ .check-visual { outline: 2px solid var(--green); outline-offset: 2px; }

.roster-id {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.roster-name {
  font-size: 14.5px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.roster-status {
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 3px 8px;
  border-radius: 20px;
  white-space: nowrap;
}
.roster-status.is-present { background: var(--green-soft); color: var(--green); }
.roster-status.is-absent { background: var(--rust-soft); color: var(--rust); }

/* ---------- save bar ---------- */
.save-bar {
  position: sticky;
  bottom: 12px;
  margin-top: 16px;
}

@media (max-width: 480px) {
  .roster-label { grid-template-columns: 24px 46px 1fr auto; padding: 10px 12px; gap: 8px; }
  .roster-name { font-size: 14px; }
  .roster-status { font-size: 10px; padding: 2px 6px; }
  .app-header { flex-wrap: wrap; gap: 8px; }
}