/* ---------- Theme tokens ---------- */

:root {
  --font-body: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-hand: "Patrick Hand", "Comic Sans MS", cursive;
  --radius: 14px;

  /* Crayon-box band colors */
  --band-A: #2e9e5b;
  --band-B: #5cb85c;
  --band-C: #e0a800;
  --band-D: #e8742c;
  --band-F: #d9434e;
}

/* Paper mode */
:root[data-theme="light"] {
  --bg: #dfeeec;
  --bg-gradient: radial-gradient(900px 420px at 50% -10%, #f0f9f8 0%, transparent 60%);
  --card-bg: #fafdfd;
  --card-border: #bedad5;
  --text: #24403d;
  --text-muted: #698783;
  --accent: #1f8a80;          /* deep teal */
  --accent-soft: #4dab9f;
  --input-bg: #eaf5f3;
  --tape: rgba(94, 190, 178, 0.5);
  --eraser-bg: #f6ccd4;
  --eraser-text: #94404f;
  --row-tint: 0.16;
  --shadow: 0 8px 24px rgba(31, 74, 70, 0.12);
}

/* Chalkboard mode */
:root[data-theme="dark"] {
  --bg: #1c2b2a;
  --bg-gradient: radial-gradient(900px 420px at 50% -10%, #263c3a 0%, transparent 60%);
  --card-bg: #243634;
  --card-border: rgba(224, 240, 238, 0.35);
  --text: #dfeeec;
  --text-muted: #9dbab6;
  --accent: #7fd8cc;          /* teal chalk */
  --accent-soft: #9de3d9;
  --input-bg: #182523;
  --tape: rgba(94, 190, 178, 0.35);
  --eraser-bg: #5b4047;
  --eraser-text: #f0c5cd;
  --row-tint: 0.26;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

/* ---------- Base ---------- */

* { box-sizing: border-box; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg-gradient), var(--bg);
  display: flex;
  flex-direction: column;
}

/* Crayon stripe across the very top of the page */
body::before {
  content: "";
  height: 8px;
  width: 100%;
  flex: none;
  background: repeating-linear-gradient(
    90deg,
    var(--band-F) 0 48px,
    var(--band-D) 48px 96px,
    var(--band-C) 96px 144px,
    var(--band-A) 144px 192px,
    #4a90d9 192px 240px
  );
}

/* ---------- Header ---------- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1060px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 24px 4px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  font-size: 2.2rem;
  line-height: 1;
  filter: drop-shadow(0 2px 2px rgba(0, 0, 0, 0.15));
}

.brand h1 {
  margin: 0;
  font-family: var(--font-hand);
  font-size: 1.9rem;
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.brand p {
  margin: 0;
  font-family: var(--font-hand);
  font-size: 1rem;
  color: var(--text-muted);
}

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

.clear-all-btn {
  font-size: 1.05rem;
  padding: 7px 18px;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
}

.theme-toggle:hover { transform: scale(1.08); }

:root[data-theme="light"] .icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: none; }

/* ---------- Cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 28px;
  max-width: 1060px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 24px 24px;
  flex: 1;
  align-content: start;
}

.card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 22px 18px;
}

/* Chalk-drawn border on the chalkboard */
:root[data-theme="dark"] .card {
  border: 2px dashed var(--card-border);
}

/* A piece of washi tape holding each card up */
.card::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 50%;
  width: 110px;
  height: 24px;
  transform: translateX(-50%) rotate(-2deg);
  background: var(--tape);
  border-left: 2px dotted rgba(255, 255, 255, 0.5);
  border-right: 2px dotted rgba(255, 255, 255, 0.5);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-header h2 {
  margin: 0;
  font-family: var(--font-hand);
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.subject-icon {
  font-size: 1.4rem;
  line-height: 1;
}

/* "Pink eraser" clear button */
.reset-btn {
  border: none;
  background: var(--eraser-bg);
  color: var(--eraser-text);
  font-family: var(--font-hand);
  font-size: 0.95rem;
  padding: 4px 14px;
  border-radius: 6px;
  cursor: pointer;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.12);
  transition: transform 0.1s ease;
}

.reset-btn:hover { transform: translateY(-1px); }
.reset-btn:active { transform: translateY(1px); box-shadow: none; }

/* ---------- Inputs ---------- */

.card-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 18px;
}

.field span {
  display: block;
  font-family: var(--font-hand);
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  letter-spacing: 0.03em;
}

.field input {
  width: 100%;
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field input:focus {
  border-color: var(--accent-soft);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}

/* Hide number spinners */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; appearance: textfield; }

/* ---------- Band table ---------- */

.band-table {
  border: 1px solid var(--card-border);
  border-radius: 10px;
  overflow: hidden;
}

.band-row {
  display: grid;
  grid-template-columns: 44px 1.4fr 0.9fr 1.1fr;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  font-size: 0.95rem;
  border-top: 1px solid var(--card-border);
  transition: background-color 0.2s ease;
}

.band-row:first-child { border-top: none; }

.band-head {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--input-bg);
}

.band-name {
  font-family: var(--font-hand);
  font-size: 1.1rem;
}

.band-percent,
.band-points {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.band-percent { color: var(--text-muted); }

/* Grade pills styled like round stickers */
.band-pill {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
  box-shadow: 0 0 0 2px var(--card-bg), 0 1px 3px rgba(0, 0, 0, 0.25);
  transform: rotate(-4deg);
}

.band-A .band-pill { background: var(--band-A); }
.band-B .band-pill { background: var(--band-B); }
.band-C .band-pill { background: var(--band-C); }
.band-D .band-pill { background: var(--band-D); }
.band-F .band-pill { background: var(--band-F); }

/* Highlight for the matched band */
.band-row.active.band-A { background: color-mix(in srgb, var(--band-A) calc(var(--row-tint) * 100%), transparent); }
.band-row.active.band-B { background: color-mix(in srgb, var(--band-B) calc(var(--row-tint) * 100%), transparent); }
.band-row.active.band-C { background: color-mix(in srgb, var(--band-C) calc(var(--row-tint) * 100%), transparent); }
.band-row.active.band-D { background: color-mix(in srgb, var(--band-D) calc(var(--row-tint) * 100%), transparent); }
.band-row.active.band-F { background: color-mix(in srgb, var(--band-F) calc(var(--row-tint) * 100%), transparent); }

.band-row.active .band-name { font-weight: 700; }

/* ---------- Result banner ---------- */

.result[hidden] { display: none; }

.result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 2px dashed var(--card-border);
  background: var(--input-bg);
  font-size: 1rem;
}

.result-score {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.result-band {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-hand);
  font-size: 1.15rem;
  font-weight: 700;
}

.result-A { border-color: var(--band-A); }
.result-B { border-color: var(--band-B); }
.result-C { border-color: var(--band-C); }
.result-D { border-color: var(--band-D); }
.result-F { border-color: var(--band-F); }

.result-A .result-band { color: var(--band-A); }
.result-B .result-band { color: var(--band-B); }
.result-C .result-band { color: var(--band-C); }
.result-D .result-band { color: var(--band-D); }
.result-F .result-band { color: var(--band-F); }

/* Chalk text needs lighter band colors to stay readable */
:root[data-theme="dark"] .result-A .result-band { color: #7fd9a4; }
:root[data-theme="dark"] .result-B .result-band { color: #9fd89f; }
:root[data-theme="dark"] .result-C .result-band { color: #f3cf6a; }
:root[data-theme="dark"] .result-D .result-band { color: #f5a76d; }
:root[data-theme="dark"] .result-F .result-band { color: #f08e96; }

/* ---------- Footer ---------- */

.site-footer {
  text-align: center;
  padding: 20px;
  font-family: var(--font-hand);
  font-size: 1rem;
  color: var(--text-muted);
}

.noscript-warning {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--band-F);
}

@media (max-width: 420px) {
  .card-inputs { grid-template-columns: 1fr; }
  .band-row { grid-template-columns: 38px 1.3fr 0.9fr 1.1fr; font-size: 0.88rem; }
}

/* ---------- Print ---------- */

@media print {
  /* Print on paper regardless of the on-screen theme */
  :root, :root[data-theme="dark"] {
    --bg: #fff;
    --bg-gradient: none;
    --card-bg: #fff;
    --card-border: #bbb;
    --text: #000;
    --text-muted: #555;
    --input-bg: #f5f5f5;
    --row-tint: 0.2;
    --shadow: none;
  }

  body::before,
  .header-actions,
  .reset-btn,
  .card::before,
  .site-footer { display: none; }

  .card,
  :root[data-theme="dark"] .card {
    border: 1px solid var(--card-border);
    break-inside: avoid;
  }

  /* Chalk-tinted result colors are unreadable on paper */
  :root[data-theme="dark"] .result-A .result-band { color: var(--band-A); }
  :root[data-theme="dark"] .result-B .result-band { color: var(--band-B); }
  :root[data-theme="dark"] .result-C .result-band { color: var(--band-C); }
  :root[data-theme="dark"] .result-D .result-band { color: var(--band-D); }
  :root[data-theme="dark"] .result-F .result-band { color: var(--band-F); }

  .band-pill,
  .band-row.active {
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }
}