/* Bimbel Cerdas Juara — arah visual "Papan Tulis".
   Kertas bergaris 32px, margin merah di kiri, Caveat hanya untuk aksen tulisan
   tangan, Work Sans untuk teks dan angka. Tanpa ilustrasi kartun, tanpa emoji. */

:root {
  --bg: #FCFBF6;
  --paper: #FFFDF7;
  --ink: #20303A;
  --ink-soft: #4A5A63;
  --line: #D8DED0;
  --rule: #E4E9DE;
  --redline: #D9A49D;
  --accent: #1E7A5A;
  --accent-dark: #16624A;
  --accent-wash: #EAF2EC;
  --marker: #E4572E;
  --marker-ink: #B23A18;
  --board: #1E7A5A;
  --radius: 2px;
  --margin-x: 56px;
  --pad-x: clamp(16px, 4vw, 48px);
  --edge: calc(var(--margin-x) + 26px);
}

body {
  background-color: var(--bg);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0 31px,
    var(--rule) 31px 32px
  );
  background-repeat: repeat;
  color: var(--ink);
  font-family: "Work Sans", system-ui, -apple-system, sans-serif;
  font-size: 16px;
}

/* Margin merah kertas, tetap terlihat saat halaman digulir. */
body::before {
  content: "";
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--margin-x);
  border-right: 1px solid var(--redline);
  background-image: linear-gradient(
    to right,
    transparent 0 calc(100% - 8px),
    rgba(217, 164, 157, .6) calc(100% - 8px) calc(100% - 7px),
    transparent calc(100% - 7px)
  );
  pointer-events: none;
  z-index: 0;
}

.paper {
  position: relative;
  z-index: 1;
}

::selection { background: #F4DCC8; }

/* ---------- Kepala halaman ---------- */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  padding: 18px var(--pad-x) 16px var(--edge);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(to bottom, var(--bg) 78%, transparent);
}

.top-left { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

.demo-badge {
  color: var(--accent-dark);
  font-weight: 600;
}

.brand {
  font-family: "Caveat", "Segoe Script", cursive;
  font-size: 27px;
  line-height: 1;
  letter-spacing: .01em;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.top-right {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 12.5px;
  color: var(--ink-soft);
}

.top-wa {
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
}

.top-wa:focus-visible { outline: 2px solid var(--accent-dark); outline-offset: 3px; }

/* ---------- Lembar soal 2 kolom ---------- */

.board {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  gap: clamp(26px, 3.4vw, 56px);
  align-items: start;
  max-width: 1220px;
  margin: 0 auto;
  padding: clamp(26px, 3.4vw, 44px) var(--pad-x) 56px var(--edge);
}

.kicker {
  margin: 0 0 14px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

h1 {
  margin: 0 0 18px;
  font-family: "Caveat", "Segoe Script", cursive;
  font-weight: 600;
  font-size: clamp(2.5rem, 5.4vw, 3.9rem);
  line-height: .98;
  letter-spacing: .002em;
  color: var(--ink);
  max-width: 14ch;
}

.mark {
  background-image: linear-gradient(transparent 68%, rgba(228, 87, 46, .3) 68%);
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.lede {
  margin: 0 0 26px;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* Kotak soal */
.problem {
  margin: 0 0 28px;
  padding: 14px 16px 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--marker);
}

.problem-tag {
  margin: 0 0 6px;
  font-family: "Caveat", "Segoe Script", cursive;
  font-size: 22px;
  line-height: 1;
  color: var(--marker-ink);
}

.problem-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink);
}

/* Langkah bertingkat */
.steps {
  list-style: none;
  counter-reset: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 18px;
}

.steps li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.step-no {
  font-family: "Caveat", "Segoe Script", cursive;
  font-size: 32px;
  line-height: .9;
  color: var(--accent);
  border-bottom: 1px dashed rgba(30, 122, 90, .5);
  padding-bottom: 4px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.step-body h2 {
  margin: 0 0 3px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .01em;
}

.step-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* Kartu PR bergaris miring */
.pr {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin: 0 0 26px;
  padding: 16px 18px;
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(30, 122, 90, .075) 0 9px,
    transparent 9px 19px
  );
  border: 1px solid var(--line);
  border-left: 5px solid var(--accent);
}

.pr-tag {
  display: inline-block;
  transform: rotate(-7deg);
  font-family: "Caveat", "Segoe Script", cursive;
  font-size: 30px;
  line-height: 1;
  color: var(--marker-ink);
  letter-spacing: .04em;
}

.pr-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

/* Fakta ringkas */
.facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--line);
}

.facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-right: 10px;
}

.facts li + li {
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.fact-num {
  font-family: "Caveat", "Segoe Script", cursive;
  font-size: 30px;
  line-height: 1;
  color: var(--accent-dark);
  font-variant-numeric: tabular-nums;
}

.fact-label {
  font-size: 12px;
  line-height: 1.35;
  color: var(--ink-soft);
}

/* ---------- Kolom kanan ---------- */

.work { display: flex; flex-direction: column; gap: 24px; }

.calc {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: clamp(18px, 2.2vw, 26px);
  box-shadow: 3px 3px 0 rgba(32, 48, 58, .06);
}

.calc-head {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  margin: 0 0 20px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line);
}

.calc-no {
  font-family: "Caveat", "Segoe Script", cursive;
  font-size: 26px;
  line-height: 1;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  font-variant-numeric: tabular-nums;
}

.calc-head h2 {
  margin: 0 0 4px;
  font-family: "Caveat", "Segoe Script", cursive;
  font-weight: 600;
  font-size: 30px;
  line-height: 1.05;
  color: var(--ink);
}

.calc-head p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.form { display: flex; flex-direction: column; gap: 16px; }

.grid-2 {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
}

/* Field */
.fld { gap: 5px; }

.fld-label {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
}

.fld-unit {
  font-weight: 400;
  color: var(--ink-soft);
}

.fld-req { color: var(--marker-ink); }

.fld-input {
  min-height: 46px;
  padding: 11px 12px;
  font-family: inherit;
  font-size: 16px;
  color: var(--ink);
  background: #FFFEF9;
  border: 1px solid #C6D0C0;
  border-radius: var(--radius);
  transition: border-color .15s ease, box-shadow .15s ease;
}

.fld-input:hover { border-color: #9DB1A1; }

.fld-input:focus {
  outline: none;
  border-color: var(--accent);
  background: #FFFFFF;
  box-shadow: 0 0 0 3px rgba(30, 122, 90, .18);
}

.fld-input:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 2px;
}

.fld-hint {
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.fld-error { color: #8A2E14; }

.fld.is-error .fld-input {
  border-color: #B23A18;
  background: #FDF4F0;
}

.opt-check {
  min-height: 46px;
  padding: 11px 12px;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--ink);
  background: #F5F8F0;
  border: 1px dashed #B4C2AC;
  border-radius: var(--radius);
  transition: background .15s ease, border-color .15s ease;
}

.opt-check:hover { background: #EFF4E9; }

.opt-check input {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  accent-color: var(--accent);
}

.opt-check:has(input:checked) {
  background: var(--accent-wash);
  border-color: var(--accent);
  border-style: solid;
}

.opt-check:focus-within {
  outline: 2px solid var(--accent-dark);
  outline-offset: 2px;
}

.opt-add { color: var(--ink-soft); }

.btn {
  appearance: none;
  min-height: 48px;
  padding: 13px 18px;
  font-family: inherit;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: .01em;
  color: #FFFFFF;
  background: var(--accent);
  border: 1px solid var(--accent-dark);
  border-radius: var(--radius);
  transition: background .15s ease, transform .1s ease;
}

.btn:hover { background: var(--accent-dark); }
.btn:active { transform: translateY(1px); }

.btn:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.form-note {
  margin: -4px 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.alert {
  margin: 0 0 16px;
  padding: 11px 13px;
  font-size: 13.5px;
  line-height: 1.5;
  color: #7C2410;
  background: #FDF2EC;
  border: 1px solid #EFC9BA;
  border-left: 4px solid var(--marker);
}

/* ---------- Lembar jawaban ---------- */

.answer {
  position: relative;
  background: var(--paper);
  border: 1px solid #C9D3C3;
  border-radius: var(--radius);
  padding: 20px clamp(16px, 2.2vw, 22px) 22px;
}

.answer::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px dashed rgba(30, 122, 90, .18);
  pointer-events: none;
}

.answer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.answer-label {
  margin: 0;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.answer-code {
  margin: 6px 0 0;
  display: inline-block;
  padding: 3px 8px;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--accent-dark);
  border: 1px dashed rgba(30, 122, 90, .55);
  font-variant-numeric: tabular-nums;
}

.stamp {
  display: inline-block;
  transform: rotate(-7deg);
  transform-origin: right center;
  padding: 5px 8px;
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--accent-dark);
  background: rgba(255, 253, 247, .8);
  border: 2px solid rgba(30, 122, 90, .65);
  border-radius: 2px;
  white-space: nowrap;
}

.answer-head {
  margin: 0 0 12px;
  font-family: "Caveat", "Segoe Script", cursive;
  font-weight: 600;
  font-size: clamp(24px, 3vw, 30px);
  line-height: 1.08;
  color: var(--ink);
}

.answer-meta {
  margin: 0 0 6px;
  padding: 0;
}

.answer-meta > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 12px;
  padding: 7px 0;
  border-bottom: 1px dotted #C4CFBD;
}

.answer-meta dt {
  font-size: 12px;
  color: var(--ink-soft);
}

.answer-meta dd {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.answer-lines {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.answer-lines li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px dotted #C4CFBD;
}

.line-main { font-size: 13.5px; line-height: 1.4; }

.line-note {
  display: block;
  font-size: 11.5px;
  color: var(--ink-soft);
}

.line-amt {
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
}

.num { font-variant-numeric: tabular-nums; }

.answer-total {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 2px solid var(--ink);
}

.answer-total span {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink-soft);
}

.answer-total strong {
  font-size: clamp(23px, 3.4vw, 29px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink);
}

.answer-msg {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.answer-again {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-dark);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.answer-again:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 3px;
}

/* Papan tulis kecil untuk contoh jadwal */
.chalk {
  margin: 0 0 4px;
  padding: 12px 14px 14px;
  color: #F7F6EC;
  background: var(--board);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(255, 255, 255, .045) 0 6px,
    transparent 6px 14px
  );
  border-left: 4px solid #12452F;
}

.chalk-label {
  margin: 0 0 4px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #D8E9DF;
}

.chalk-text {
  margin: 0;
  font-family: "Caveat", "Segoe Script", cursive;
  font-size: 23px;
  line-height: 1.15;
}

/* ---------- Riwayat ---------- */

.history h2 {
  margin: 0 0 8px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.history ul { list-style: none; margin: 0; padding: 0; }

.history li {
  display: grid;
  gap: 1px;
  padding: 9px 0;
  border-bottom: 1px dotted #C4CFBD;
}

.history li:first-child { border-top: 1px solid var(--line); }

.history-sum { font-size: 13.5px; }

.history-meta {
  font-size: 12px;
  color: var(--ink-soft);
}

.history-meta .num { color: var(--ink); font-weight: 600; }

.history-empty,
.history-count {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--ink-soft);
}

/* ---------- Kaki ---------- */

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding: 20px var(--pad-x) 24px var(--edge);
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--ink-soft);
  background: linear-gradient(to top, var(--bg) 70%, transparent);
}

.foot p { margin: 0; }

.foot-credit { color: var(--ink); font-weight: 600; }

/* ---------- Responsif ---------- */

@media (max-width: 1020px) {
  .board {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }
  h1 { max-width: 18ch; }
  .work { max-width: 640px; }
}

@media (max-width: 720px) {
  :root {
    --margin-x: 22px;
    --edge: 34px;
    --pad-x: 16px;
  }
  body { font-size: 15.5px; }

  .top { padding: 14px var(--pad-x) 14px var(--edge); }
  .brand { font-size: 24px; padding-left: 12px; }
  .top-term { display: none; }

  .board { padding: 22px var(--pad-x) 42px var(--edge); }

  h1 { font-size: clamp(2.2rem, 9vw, 2.8rem); max-width: none; }

  .lede { font-size: 15px; }

  .grid-2 { grid-template-columns: minmax(0, 1fr); }

  .facts { padding-top: 12px; }
  .fact-num { font-size: 26px; }
  .fact-label { font-size: 11.5px; }

  .stamp { font-size: 9px; letter-spacing: .1em; padding: 4px 6px; }

  .answer-meta dd { text-align: left; }

  .foot { padding: 18px var(--pad-x) 22px var(--edge); }
}

@media (max-width: 400px) {
  .pr {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }
  .pr-tag { transform: none; }
  .steps li { grid-template-columns: 34px minmax(0, 1fr); gap: 10px; }
  .step-no { font-size: 28px; }
}