/* ============================================================
   Math Practice — Kumon-style redesign
   Palette: warm white background, Kumon-red accent, gold stars,
   clean educational feel. Nunito + Baloo 2 typefaces.
   ============================================================ */

:root {
  /* Core palette */
  --bg:         #fdf8f2;
  --bg2:        #fff9f4;
  --card:       #ffffff;
  --text:       #1a1a2e;
  --muted:      #7a7a9d;
  --border:     #e8e0d5;
  --border2:    #d4cac0;

  /* Brand / accent */
  --red:        #e8372a;
  --red-light:  #fff0ef;
  --red-mid:    rgba(232,55,42,.12);
  --red-dark:   #c42d21;

  /* Success / warning */
  --green:      #22c55e;
  --green-bg:   #f0fdf4;
  --green-bdr:  rgba(34,197,94,.3);
  --wrong:      #ef4444;
  --wrong-bg:   #fff5f5;
  --wrong-bdr:  rgba(239,68,68,.35);

  --gold:       #f59e0b;
  --gold-bg:    #fffbeb;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:  0 4px 16px rgba(0,0,0,.08), 0 1px 4px rgba(0,0,0,.04);
  --shadow-lg:  0 12px 40px rgba(0,0,0,.1), 0 2px 8px rgba(0,0,0,.06);

  /* Radius */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;

  /* Fonts */
  --font-body:   'Nunito', system-ui, sans-serif;
  --font-display:'Baloo 2', system-ui, sans-serif;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- Decorative background ---- */
.bg-deco { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
}
.blob-1 {
  width: 600px; height: 500px;
  background: radial-gradient(circle, #ffe4e0 0%, transparent 70%);
  top: -120px; left: -100px;
}
.blob-2 {
  width: 500px; height: 400px;
  background: radial-gradient(circle, #fef3c7 0%, transparent 70%);
  top: 30%; right: -80px;
}
.blob-3 {
  width: 400px; height: 350px;
  background: radial-gradient(circle, #e0f2fe 0%, transparent 70%);
  bottom: 0; left: 30%;
}
.dots-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, #c9b8a8 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.18;
}

/* ---- Layout ---- */
.wrap {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

/* ---- Header ---- */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
}
.header-brand { display: flex; align-items: center; gap: 14px; }
.brand-logo { display: flex; align-items: center; gap: 14px; }

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  background: var(--red);
  border-radius: 14px;
  font-size: 22px;
  color: white;
  box-shadow: 0 4px 14px rgba(232,55,42,.4);
  flex-shrink: 0;
}

h1 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.3px;
  line-height: 1.1;
}
.sub {
  font-size: 13px;
  color: var(--muted);
  font-weight: 600;
  margin-top: 2px;
}
.topRight { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* ---- Cards ---- */
.card {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-md);
  margin-top: 18px;
  overflow: hidden;
}
.card-inner { padding: 20px 22px; }

/* ---- Controls card top accent ---- */
.controls-card {
  border-top: 4px solid var(--red);
}

/* ---- Settings row ---- */
.settings-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
}
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.field-label {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.label-text {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

select,
input[type="text"],
input[type="number"],
textarea {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  background: var(--bg);
  border: 1.5px solid var(--border2);
  border-radius: var(--r-sm);
  padding: 9px 12px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
select { min-width: 190px; cursor: pointer; }
input[type="number"] { width: 150px; }
select:focus,
input:focus,
textarea:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(232,55,42,.12);
}

/* ---- Action row ---- */
.action-row {
  margin-top: 14px;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.btn-group-secondary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---- Buttons ---- */
button {
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  border-radius: var(--r-sm);
  padding: 9px 16px;
  border: 1.5px solid transparent;
  transition: all .15s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--red);
  color: white;
  border-color: var(--red);
  box-shadow: 0 3px 10px rgba(232,55,42,.3);
  font-size: 15px;
  padding: 11px 22px;
  border-radius: 12px;
}
.btn-primary:hover { background: var(--red-dark); box-shadow: 0 5px 14px rgba(232,55,42,.4); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

.btn-check {
  background: #16a34a;
  color: white;
  border-color: #16a34a;
  box-shadow: 0 3px 10px rgba(22,163,74,.28);
  font-size: 14px;
  padding: 9px 18px;
}
.btn-check:hover { background: #15803d; transform: translateY(-1px); }
.btn-check:disabled { opacity: 0.45; cursor: default; transform: none; }

.btn-outline {
  background: white;
  color: var(--text);
  border-color: var(--border2);
  box-shadow: var(--shadow-sm);
}
.btn-outline:hover { border-color: var(--red); color: var(--red); background: var(--red-light); }
.btn-outline:disabled { opacity: 0.45; cursor: default; }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--red-light); color: var(--red); border-color: rgba(232,55,42,.3); }

.btn-danger {
  background: white;
  color: var(--wrong);
  border-color: rgba(239,68,68,.4);
}
.btn-danger:hover { background: #fff5f5; }

.small-btn { font-size: 13px; padding: 7px 14px; }

/* ---- Status bar ---- */
.status-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1.5px solid var(--border);
}
.stat-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
}
.chip-icon { font-size: 14px; }
.chip-label { color: var(--muted); font-weight: 600; font-size: 12px; }
.chip-val { font-weight: 800; color: var(--text); font-family: var(--font-display); }

/* ---- Parent Settings ---- */
.parent-settings {
  margin-top: 14px;
  border-top: 1.5px solid var(--border);
  padding-top: 12px;
}
.parent-settings summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 700;
  font-size: 13px;
  color: var(--muted);
  list-style: none;
  user-select: none;
  gap: 8px;
}
.parent-settings summary::-webkit-details-marker { display: none; }
.parent-settings summary:hover { color: var(--red); }
.parent-settings[open] .caret { transform: rotate(180deg); }
.caret { transition: transform .2s; display: inline-block; }

.settingsGrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.toggle-label {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
}
.toggle-label input[type="checkbox"] {
  width: 17px; height: 17px;
  accent-color: var(--red);
  cursor: pointer;
  border: none;
  padding: 0;
}
.small-field select,
.small-field input { font-size: 13px; }

/* ---- Worksheet card ---- */
.worksheet-card { border-top: 4px solid var(--gold); }

.sheetHeader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}
.sheet-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
}
.badge-meta {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--muted);
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 5px 14px;
}

/* ---- Calendar ---- */
.calendar { margin-bottom: 18px; }
.calLabel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.calGrid {
  display: grid;
  grid-template-columns: repeat(14, minmax(0, 1fr));
  gap: 5px;
}
.day {
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 5px 3px;
  text-align: center;
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  background: var(--bg);
  transition: all .15s;
}
.day.done {
  border-color: var(--green-bdr);
  background: var(--green-bg);
  color: var(--green);
}
.day.today {
  border-color: var(--red);
  background: var(--red-light);
  color: var(--red);
  box-shadow: 0 0 0 2px rgba(232,55,42,.15);
}
.day.miss {
  border-color: rgba(239,68,68,.25);
  background: var(--wrong-bg);
}

/* ---- Questions ---- */
.questions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
@media (max-width: 720px) { .questions { grid-template-columns: 1fr; } }

.q {
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  padding: 13px 14px;
  background: var(--bg2);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  transition: border-color .2s, background .2s, box-shadow .2s;
}
.q:hover { border-color: var(--border2); box-shadow: var(--shadow-sm); }
.q .left { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 0; }

.q .expr {
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
  white-space: pre-line;
}
.q .hint {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--muted);
  background: var(--bg);
  display: inline-block;
  border-radius: 6px;
  padding: 1px 7px;
  border: 1px solid var(--border);
}
.solutionLine {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--wrong);
  background: var(--wrong-bg);
  border: 1px solid var(--wrong-bdr);
  border-radius: 7px;
  padding: 4px 8px;
  margin-top: 4px;
}

.q input {
  width: 130px;
  text-align: right;
  font-size: 16px;
  font-weight: 800;
  font-family: var(--font-display);
  flex-shrink: 0;
  border-radius: var(--r-sm);
  padding: 9px 10px;
  border: 2px solid var(--border2);
  background: white;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.q input:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(232,55,42,.12);
  outline: none;
}

/* Checked states */
.q.correct {
  border-color: var(--green-bdr);
  background: var(--green-bg);
  box-shadow: 0 0 0 2px rgba(34,197,94,.1);
}
.q.correct .q-num { color: var(--green); }
.q.wrong {
  border-color: var(--wrong-bdr);
  background: var(--wrong-bg);
  box-shadow: 0 0 0 2px rgba(239,68,68,.1);
}
.q.correct input { border-color: var(--green-bdr); background: #f0fdf4; color: var(--green); }
.q.wrong input { border-color: var(--wrong-bdr); background: #fff5f5; color: var(--wrong); }

/* ---- Legend ---- */
.legend {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.legendItem {
  font-size: 12.5px;
  font-weight: 700;
  padding: 5px 13px;
  border-radius: 999px;
  border: 1.5px solid var(--border);
  color: var(--muted);
}
.legendItem.ok { border-color: var(--green-bdr); color: var(--green); background: var(--green-bg); }
.legendItem.bad { border-color: var(--wrong-bdr); color: var(--wrong); background: var(--wrong-bg); }

/* ---- Feedback ---- */
.feedback {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: var(--r-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  background: var(--bg);
  border: 1.5px solid var(--border);
  min-height: 40px;
  line-height: 1.5;
  transition: all .2s;
}
.feedback:empty { display: none; }
.feedback strong { color: var(--text); font-weight: 800; }

/* ---- Modal ---- */
.modalBackdrop {
  position: fixed;
  inset: 0;
  background: rgba(26,26,46,.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}
.hidden { display: none !important; }

.modal {
  width: min(1080px, 100%);
  max-height: 90vh;
  overflow-y: auto;
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
}
.modal .card-inner { padding: 24px; }

.modalHeader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.modal-title-group { display: flex; align-items: center; gap: 10px; }
.modal-icon { font-size: 24px; }
.modalHeader h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
}

.dashGrid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
@media (max-width: 860px) { .dashGrid { grid-template-columns: 1fr; } }

.dashCard {
  border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  padding: 16px;
  background: var(--bg2);
}
.dash-section-title {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.dashBody { font-size: 13.5px; color: var(--text); line-height: 1.7; }
.dashBody div { padding: 2px 0; }
.dashBody strong { font-weight: 800; }

/* Progress bars */
.barRow {
  display: grid;
  grid-template-columns: 140px 1fr 55px;
  gap: 10px;
  align-items: center;
  margin: 8px 0;
  font-size: 13px;
  font-weight: 700;
}
.bar {
  height: 10px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.bar > div { height: 100%; border-radius: 999px; transition: width .4s ease; }
.badBar > div { background: linear-gradient(90deg, var(--wrong), #f87171); }
.goodBar > div { background: linear-gradient(90deg, var(--green), #4ade80); }

/* Export/import */
.exportOut {
  width: 100%;
  min-height: 120px;
  margin-top: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  border-radius: var(--r-sm);
  resize: vertical;
}
.backup-buttons { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.importBlock { margin-top: 14px; }
.small-label { font-size: 12px; font-weight: 700; color: var(--muted); display: block; margin-bottom: 6px; }
.import-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.file-label {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 700;
}
.file-label input { display: none; }
.import-status {
  font-size: 12.5px;
  font-weight: 700;
  margin-top: 6px;
  color: var(--muted);
}

/* ---- Password modal ---- */
.password-modal {
  max-width: 400px !important;
  width: 100%;
  text-align: center;
}
.password-modal .card-inner { padding: 32px 28px; }
.pw-icon { font-size: 42px; margin-bottom: 10px; }
.password-modal h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 6px;
}
.pw-sub { font-size: 13px; color: var(--muted); margin-bottom: 18px; font-weight: 600; }
.pw-input {
  width: 100%;
  text-align: center;
  font-size: 18px;
  letter-spacing: 2px;
  margin-bottom: 14px;
}
.pw-actions { display: flex; gap: 10px; justify-content: center; }
.pw-error { font-size: 13px; font-weight: 700; color: var(--wrong); margin-top: 10px; min-height: 20px; }

/* ---- Footer ---- */
.footer {
  text-align: center;
  margin-top: 24px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.footer-dot { color: var(--border2); font-size: 8px; }

/* ---- Print ---- */
@media print {
  body { background: white; color: black; }
  .bg-deco, .controls-card, .legend, .feedback, .footer,
  .topRight, .calendar, .status-bar, .action-row { display: none !important; }
  .card {
    box-shadow: none;
    border: none;
    border-top: none !important;
    margin: 0;
    border-radius: 0;
  }
  .card-inner { padding: 0; }
  .sheetHeader { margin-bottom: 10px; }
  .questions { gap: 8px; }
  .q {
    border: 1px solid #ccc;
    background: white;
    border-radius: 8px;
  }
  .q input { display: none !important; }
  .q .hint { display: none !important; }
  .solutionLine { display: none !important; }
  .badge-meta { background: none; border: none; }
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .wrap { padding: 14px 12px 30px; }
  h1 { font-size: 20px; }
  .logo-icon { width: 42px; height: 42px; font-size: 18px; }
  .calGrid { grid-template-columns: repeat(7, minmax(0, 1fr)); }
  .btn-primary { font-size: 14px; padding: 10px 18px; }
  .settingsGrid { grid-template-columns: 1fr; }
  select { min-width: 160px; }
}

/* ---- Misc utility ---- */
.muted { color: var(--muted); }
.small { font-size: 12px; }