/* 매일수학 — 수능 시험지 스타일 (단일 테마: 인쇄된 갱지 시험지에 커밋) */

:root {
  --desk: #dcd8cb;        /* 시험지 밖 책상 */
  --paper: #f7f5ec;       /* 갱지 */
  --paper-dim: #efece0;   /* 갱지 음영 (박스 헤더) */
  --ink: #1d1a16;         /* 먹 */
  --ink-soft: #57524a;    /* 옅은 먹 */
  --faint: #8d8778;       /* 힌트·보조 */
  --line: #2b2823;        /* 인쇄 괘선 */
  --red: #b52e24;         /* 채점 빨간 펜 — 유일한 포인트 */
  --omr-bg: #f9efe9;      /* OMR 답안지 살구빛 */
  --omr-line: #c9a094;
  --serif: "Noto Serif KR", "Nanum Myeongjo", "AppleMyungjo", Batang, BatangChe, "Times New Roman", serif;
  --mono: "SF Mono", "Menlo", "Consolas", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  background: var(--desk);
  color: var(--ink);
  font-family: var(--serif);
  line-height: 1.75;
  font-size: 16.5px;
  word-break: keep-all;
}

#app { display: flex; justify-content: center; min-height: 100vh; }

.sheet {
  background: var(--paper);
  width: 100%;
  max-width: 580px;
  min-height: 100vh;
  padding: 18px 20px 48px;
  box-shadow: 0 0 24px rgba(40, 35, 20, 0.25);
  position: relative;
}

/* ── 시험지 상단 ─────────────────────────── */
.exam-strip {
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.35em;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  padding-bottom: 6px;
}

.exam-title {
  display: flex;
  align-items: stretch;
  border-bottom: 4px double var(--line);
  padding: 12px 0 14px;
  gap: 12px;
}

.exam-title .period {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 12px;
  letter-spacing: 0.2em;
  border: 1px solid var(--line);
  padding: 8px 3px;
  align-self: center;
}

.exam-title h1 {
  flex: 1;
  font-size: 30px;
  font-weight: 800;
  text-align: center;
  align-self: center;
  letter-spacing: 0.06em;
  text-wrap: balance;
}

.exam-title .form-badge {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 12px;
  letter-spacing: 0.2em;
  border: 1px solid var(--line);
  background: var(--ink);
  color: var(--paper);
  padding: 8px 3px;
  align-self: center;
}

.exam-meta {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--ink-soft);
  padding: 8px 2px 0;
}
.exam-meta .clock { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.exam-meta .clock.warn { color: var(--red); font-weight: 700; }

main { padding-top: 22px; }

/* ── 표지(유의사항) ─────────────────────────── */
.notice {
  border: 1.5px solid var(--line);
  margin-top: 8px;
}
.notice-head {
  background: var(--paper-dim);
  border-bottom: 1px solid var(--line);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.25em;
  text-align: center;
  padding: 7px 0;
}
.notice ol {
  padding: 14px 18px 14px 36px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--ink-soft);
}
.notice li::marker { font-weight: 700; color: var(--ink); }

.cover-stats {
  display: flex;
  justify-content: center;
  gap: 26px;
  margin: 26px 0 4px;
  font-size: 13.5px;
  color: var(--ink-soft);
}
.cover-stats b { font-size: 21px; color: var(--ink); display: block; text-align: center; font-variant-numeric: tabular-nums; }

/* ── 문제 ─────────────────────────── */
.q { margin-bottom: 26px; }
.q-body { font-size: 17.5px; line-height: 1.9; }
.q-no { font-weight: 800; font-size: 19px; margin-right: 2px; }
.pts { color: var(--ink-soft); font-size: 14.5px; white-space: nowrap; }

/* 도형·시각 자료 */
.q-fig {
  display: flex;
  justify-content: center;
  margin: 20px 0 6px;
}
.q-fig svg {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  color: var(--ink);
}
.q-fig figcaption {
  font-size: 12.5px;
  color: var(--faint);
  text-align: center;
  margin-top: 6px;
}

/* 연습장 */
.scratch { margin: 18px 0; border: 1px dashed var(--faint); }
.scratch summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--ink-soft);
  padding: 7px 12px;
  letter-spacing: 0.12em;
  list-style: none;
}
.scratch summary::before { content: "✎ "; }
.scratch textarea {
  display: block;
  width: 100%;
  min-height: 130px;
  border: 0;
  border-top: 1px dashed var(--faint);
  background:
    repeating-linear-gradient(transparent, transparent 27px, rgba(141, 135, 120, 0.35) 28px);
  font-family: var(--serif);
  font-size: 15px;
  line-height: 28px;
  padding: 0 12px;
  color: var(--ink);
  resize: vertical;
}
.scratch textarea:focus { outline: none; }

/* ── OMR 답안 기입란 ─────────────────────────── */
.omr { border: 1.5px solid var(--omr-line); background: var(--omr-bg); margin-top: 20px; }
.omr-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--omr-line);
  padding: 7px 12px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: #8a5044;
}
.tries { letter-spacing: 0.3em; font-size: 12px; }
.omr-row { display: flex; gap: 8px; padding: 14px 12px 6px; }
.omr-row input {
  flex: 1;
  min-width: 0;
  border: 1.5px solid var(--line);
  background: #fff;
  font-family: var(--serif);
  font-size: 18px;
  padding: 10px 12px;
  color: var(--ink);
}
.omr-row input:focus { outline: 2px solid var(--ink); outline-offset: 1px; }
.omr-hint { font-size: 12.5px; color: var(--faint); padding: 0 12px 12px; }

.feedback { padding: 0 12px 14px; font-size: 15px; }
.feedback .wrong { color: var(--red); font-weight: 700; }
.feedback .ok { color: var(--red); font-weight: 800; }

/* ── 버튼 ─────────────────────────── */
button {
  font-family: var(--serif);
  font-size: 15.5px;
  border: 1.5px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 10px 18px;
  cursor: pointer;
}
button:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
button:active { transform: translateY(1px); }
@media (prefers-reduced-motion: reduce) { button:active { transform: none; } }

.btn-primary { background: var(--ink); color: var(--paper); font-weight: 700; }
.btn-block { display: block; width: 100%; margin-top: 12px; }
.btn-big { padding: 15px 18px; font-size: 17px; letter-spacing: 0.15em; }
button:disabled {
  background: var(--paper-dim);
  color: var(--faint);
  border-color: var(--faint);
  cursor: not-allowed;
}
.btn-locked { position: relative; }
.countdown { font-family: var(--mono); font-variant-numeric: tabular-nums; }

.reveal-note { font-size: 12.5px; color: var(--faint); text-align: center; margin-top: 8px; }

/* ── 채점·해설 ─────────────────────────── */
.grade-box {
  border: 1.5px solid var(--line);
  display: flex;
  margin-bottom: 24px;
}
.grade-box .cell {
  flex: 1;
  padding: 12px 8px 10px;
  text-align: center;
  border-right: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--ink-soft);
}
.grade-box .cell:last-child { border-right: 0; }
.grade-box .cell b {
  display: block;
  font-size: 19px;
  color: var(--ink);
  margin-top: 2px;
  font-variant-numeric: tabular-nums;
}
.grade-box .cell b.red { color: var(--red); }

/* 채점 도장 느낌 */
.stamp {
  font-size: 26px;
  font-weight: 800;
  color: var(--red);
  border: 3px solid var(--red);
  display: inline-block;
  padding: 2px 16px;
  transform: rotate(-4deg);
  margin-bottom: 18px;
}
@media (prefers-reduced-motion: no-preference) {
  .stamp { animation: stamp-in 0.25s ease-out; }
  @keyframes stamp-in {
    from { transform: rotate(-4deg) scale(1.6); opacity: 0; }
    to { transform: rotate(-4deg) scale(1); opacity: 1; }
  }
}

.sol { border-top: 4px double var(--line); padding-top: 18px; margin-top: 6px; }
.sol-label {
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--ink-soft);
  text-align: center;
  margin-bottom: 16px;
}
.sol-answer { font-size: 17px; margin-bottom: 14px; }
.sol-answer b { border-bottom: 2px solid var(--red); padding-bottom: 1px; }
.sol-intent {
  background: var(--paper-dim);
  border-left: 3px solid var(--line);
  padding: 10px 14px;
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 18px;
}
.sol-steps p { margin-bottom: 14px; font-size: 16px; line-height: 1.95; text-indent: 0.5em; }
.sol-key {
  border: 1.5px solid var(--line);
  padding: 12px 14px;
  font-size: 14.5px;
  margin-top: 18px;
}
.sol-key::before {
  content: "핵심";
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  padding: 1px 8px;
  margin-right: 8px;
  vertical-align: 1px;
}
.sol-topic { font-size: 12.5px; color: var(--faint); margin-top: 10px; text-align: right; }

/* ── 완료 화면 ─────────────────────────── */
.tomorrow {
  text-align: center;
  color: var(--ink-soft);
  font-size: 14.5px;
  margin: 26px 0 6px;
}

.premium {
  margin-top: 30px;
  border-top: 1px solid var(--faint);
  padding-top: 14px;
}
.premium-label { font-size: 11.5px; letter-spacing: 0.25em; color: var(--faint); margin-bottom: 10px; text-align: center; }
.premium button { width: 100%; margin-bottom: 8px; font-size: 14px; color: var(--ink-soft); border-color: var(--faint); background: transparent; }

/* ── 토스트 ─────────────────────────── */
#toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--serif);
  font-size: 14px;
  padding: 10px 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
  max-width: 86vw;
  text-align: center;
  z-index: 50;
}
#toast.show { opacity: 1; }

/* ── 디버그 툴바 (시험지 상단 고정) ─────────────────────────── */
.dbg-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 6px;
  margin: -18px -20px 10px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11.5px;
}
.dbg-bar button {
  font-family: var(--mono);
  font-size: 12px;
  padding: 5px 9px;
  background: #3a352d;
  color: var(--paper);
  border: 1px solid #6a6055;
  cursor: pointer;
}
.dbg-bar button:hover { background: #4d463c; }
.dbg-bar .dbg-info {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  opacity: 0.9;
}
.dbg-bar .dbg-info b { color: #e8c37a; }
.dbg-bar input {
  width: 48px;
  font-family: var(--mono);
  font-size: 12px;
  padding: 4px 6px;
  background: #23201b;
  color: var(--paper);
  border: 1px solid #6a6055;
}

/* ── 디버그 패널 ─────────────────────────── */
#debug-panel {
  position: fixed;
  right: 10px;
  bottom: 10px;
  background: rgba(29, 26, 22, 0.92);
  color: #eee;
  font-family: var(--mono);
  font-size: 11px;
  padding: 10px;
  z-index: 60;
  display: none;
  max-width: 210px;
}
#debug-panel.on { display: block; }
#debug-panel button {
  display: block;
  width: 100%;
  margin: 4px 0;
  font-family: var(--mono);
  font-size: 11px;
  padding: 5px 8px;
  background: #333;
  color: #eee;
  border: 1px solid #666;
}

.foot {
  position: absolute;
  bottom: 14px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 11.5px;
  color: var(--faint);
  letter-spacing: 0.25em;
}