/* 복기 — 공통 스타일 (모눈 공책 + 형광펜) */
:root {
  --bg: #f7f6f1;
  --grid: rgba(31, 58, 95, 0.06);
  --paper: #ffffff;
  --ink: #1f2a37;
  --ink-soft: #5b6472;
  --navy: #1f3a5f;
  --navy-soft: #e8eef6;
  --mark: #ffe066;
  --mark-soft: #fff6c7;
  --ok: #1f8a4c;
  --ok-soft: #e3f4ea;
  --bad: #c0392b;
  --bad-soft: #fbe7e4;
  --warn: #b7791f;
  --line: #dfe3ea;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 14px rgba(31,58,95,.06);
  --font: system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #12161d;
  --grid: rgba(255,255,255,0.035);
  --paper: #1a2029;
  --ink: #e8ebf0;
  --ink-soft: #a3abb8;
  --navy: #8fb3e6;
  --navy-soft: #233247;
  --mark: #e6c84a;
  --mark-soft: #3a3420;
  --ok: #5fcf8f;
  --ok-soft: #1d3326;
  --bad: #ff8a7a;
  --bad-soft: #3a2220;
  --warn: #e0b060;
  --line: #2c3542;
  --shadow: 0 1px 2px rgba(0,0,0,.4);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 22px 22px;
  line-height: 1.6;
  font-size: 16px;
  padding-bottom: 76px; /* 모바일 하단 탭 공간 */
}
@media (min-width: 860px) { body { padding-bottom: 0; } }

a { color: var(--navy); }
h1, h2, h3 { line-height: 1.3; color: var(--ink); }
h1 { font-size: 1.5rem; margin: .2em 0 .4em; }
h2 { font-size: 1.2rem; margin: 1.2em 0 .5em; }
h3 { font-size: 1.05rem; margin: 1em 0 .4em; }
.mark { background: linear-gradient(transparent 55%, var(--mark) 55%); padding: 0 2px; }
.muted { color: var(--ink-soft); font-size: .92rem; }
.small { font-size: .85rem; }
.hidden { display: none !important; }

/* ---------- 머리글 / 내비게이션 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1040px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 12px;
}
.brand { font-weight: 800; font-size: 1.2rem; color: var(--navy); text-decoration: none; display: flex; align-items: center; gap: 6px; }
.brand-mark { display: inline-block; width: 26px; height: 26px; border-radius: 7px; background: var(--navy); color: var(--paper); text-align: center; line-height: 26px; font-size: .9rem; }
.topnav { display: none; gap: 2px; margin-left: 8px; flex-wrap: wrap; }
.topnav a { text-decoration: none; color: var(--ink-soft); padding: 6px 10px; border-radius: 8px; font-size: .95rem; }
.topnav a.active, .topnav a:hover { color: var(--navy); background: var(--navy-soft); }
.top-actions { margin-left: auto; display: flex; gap: 6px; }
@media (min-width: 860px) { .topnav { display: flex; } }

.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 30;
  display: grid; grid-template-columns: repeat(5, 1fr);
  background: var(--paper); border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabbar a, .tabbar button {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px; min-height: 58px; font-size: .72rem; color: var(--ink-soft);
  text-decoration: none; background: none; border: 0; font-family: inherit; cursor: pointer;
}
.tabbar .ico { font-size: 1.25rem; line-height: 1; }
.tabbar .active { color: var(--navy); font-weight: 700; }
@media (min-width: 860px) { .tabbar { display: none; } }

.sheet-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.35); z-index: 40; }
.sheet {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 41;
  background: var(--paper); border-radius: 16px 16px 0 0; padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
}
.sheet a { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 12px 4px; border-radius: 10px; text-decoration: none; color: var(--ink); background: var(--navy-soft); font-size: .85rem; text-align: center; }
.sheet .ico { font-size: 1.4rem; }

/* ---------- 레이아웃 ---------- */
main { max-width: 1040px; margin: 0 auto; padding: 16px; }
.grid { display: grid; gap: 12px; }
@media (min-width: 640px) { .grid.two { grid-template-columns: 1fr 1fr; } .grid.three { grid-template-columns: repeat(3, 1fr); } }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.row.end { justify-content: flex-end; }
.spacer { flex: 1; }

.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; box-shadow: var(--shadow);
}
.card.flat { box-shadow: none; }
.card h2:first-child, .card h3:first-child { margin-top: 0; }
.stat { font-size: 1.8rem; font-weight: 800; color: var(--navy); line-height: 1.1; }
.stat-label { font-size: .85rem; color: var(--ink-soft); }

/* ---------- 버튼 / 폼 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 44px; padding: 0 16px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink);
  font: inherit; font-weight: 600; cursor: pointer; text-decoration: none;
}
.btn:hover { border-color: var(--navy); }
.btn.primary { background: var(--navy); color: var(--paper); border-color: var(--navy); }
.btn.mark { background: var(--mark); color: #1f2a37; border-color: var(--mark); }
.btn.danger { color: var(--bad); border-color: var(--bad); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.small { min-height: 34px; padding: 0 10px; font-size: .88rem; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.icon-btn { min-width: 40px; min-height: 40px; border-radius: 10px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); cursor: pointer; font-size: 1.05rem; }

label { display: block; font-weight: 600; font-size: .92rem; margin: 10px 0 4px; }
input[type=text], input[type=date], input[type=number], select, textarea {
  width: 100%; min-height: 44px; padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink); font: inherit;
}
textarea { min-height: 110px; resize: vertical; }
input:focus, select:focus, textarea:focus, .btn:focus-visible { outline: 2px solid var(--navy); outline-offset: 1px; }
.check { display: flex; align-items: center; gap: 8px; font-weight: 500; margin: 6px 0; }
.check input { width: 20px; height: 20px; }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; flex-wrap: wrap; }
.seg button { min-height: 40px; padding: 0 12px; border: 0; background: var(--paper); color: var(--ink-soft); font: inherit; cursor: pointer; border-right: 1px solid var(--line); }
.seg button:last-child { border-right: 0; }
.seg button.on { background: var(--navy); color: var(--paper); font-weight: 700; }

/* ---------- 배지 / 칩 ---------- */
.badge { display: inline-block; font-size: .75rem; padding: 2px 8px; border-radius: 999px; background: var(--navy-soft); color: var(--navy); font-weight: 700; white-space: nowrap; }
.badge.draft { background: var(--mark-soft); color: var(--warn); }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.badge.star { background: var(--mark); color: #1f2a37; }

/* ---------- 문제 ---------- */
.q-head { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
.q-text { white-space: pre-wrap; font-size: 1.05rem; margin: 6px 0 12px; }
.choices { display: grid; gap: 8px; margin: 8px 0; }
.choice {
  display: flex; gap: 10px; align-items: flex-start; text-align: left;
  min-height: 48px; padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink); font: inherit; cursor: pointer;
}
.choice .num { flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--ink-soft); text-align: center; line-height: 24px; font-size: .9rem; }
.choice.sel { border-color: var(--navy); background: var(--navy-soft); }
.choice.sel .num { background: var(--navy); color: var(--paper); border-color: var(--navy); }
.choice.correct { border-color: var(--ok); background: var(--ok-soft); }
.choice.wrong { border-color: var(--bad); background: var(--bad-soft); }
.hint-box { border-left: 4px solid var(--mark); background: var(--mark-soft); padding: 8px 12px; border-radius: 0 8px 8px 0; margin: 6px 0; }
.result { border-radius: 10px; padding: 12px; margin-top: 12px; }
.result.ok { background: var(--ok-soft); }
.result.bad { background: var(--bad-soft); }
.progress { height: 8px; background: var(--navy-soft); border-radius: 99px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--navy); }

/* ---------- 표 / 목록 ---------- */
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { border-bottom: 1px solid var(--line); padding: 8px 6px; text-align: left; vertical-align: top; }
th { color: var(--ink-soft); font-weight: 600; }
.table-wrap { overflow-x: auto; }
.list { display: grid; gap: 8px; }
.list-item { display: flex; gap: 10px; align-items: flex-start; padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); }
.bar { height: 10px; border-radius: 99px; background: var(--navy-soft); overflow: hidden; min-width: 60px; }
.bar > span { display: block; height: 100%; background: var(--navy); }
.bar.bad > span { background: var(--bad); }

/* ---------- 모의고사 OMR ---------- */
.omr { display: grid; grid-template-columns: repeat(auto-fill, minmax(42px, 1fr)); gap: 6px; }
.omr button { min-height: 40px; border-radius: 8px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); font: inherit; font-size: .85rem; cursor: pointer; }
.omr button.done { background: var(--navy-soft); border-color: var(--navy); }
.omr button.cur { outline: 2px solid var(--mark); }
.timer { font-variant-numeric: tabular-nums; font-weight: 800; color: var(--navy); }

/* ---------- 카드 뒤집기 ---------- */
.flash { min-height: 180px; display: flex; align-items: center; justify-content: center; text-align: center; font-size: 1.15rem; cursor: pointer; }
.blank { background: var(--mark); color: transparent; border-radius: 4px; cursor: pointer; user-select: none; }
.blank.show { color: inherit; background: var(--mark-soft); }

/* ---------- 토스트 ---------- */
.toast { position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%); background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 10px; z-index: 60; font-size: .92rem; max-width: 90vw; }
@media (min-width: 860px) { .toast { bottom: 24px; } }

/* ---------- 글(가이드) ---------- */
.article { max-width: 720px; }
.article p, .article li { font-size: 1.02rem; }
.callout { border-left: 4px solid var(--navy); background: var(--navy-soft); padding: 10px 14px; border-radius: 0 10px 10px 0; margin: 12px 0; }
details { border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; background: var(--paper); margin: 8px 0; }
summary { cursor: pointer; font-weight: 600; }

.footer { max-width: 1040px; margin: 24px auto 0; padding: 16px; color: var(--ink-soft); font-size: .85rem; border-top: 1px solid var(--line); }
.footer a { color: var(--ink-soft); margin-right: 12px; }

/* ---------- 인쇄 ---------- */
@media print {
  body { background: #fff; padding: 0; color: #000; font-size: 12pt; }
  .topbar, .tabbar, .footer, .no-print, .toast { display: none !important; }
  .card { box-shadow: none; border: 0; padding: 0; }
  .print-q { break-inside: avoid; margin-bottom: 14pt; }
  main { max-width: none; padding: 0; }
}
.print-only { display: none; }
@media print { .print-only { display: block; } }