:root {
  --paper: #faf7f0;
  --card: #ffffff;
  --ink: #1d1b16;
  --ink-2: #5c574c;
  --line: #e7e1d3;
  --pen: #d6402b;
  --pen-soft: #fbe9e5;
  --ok: #1f8a5b;
  --ok-soft: #e3f3ea;
  --mark: #fff1a8;
  --radius: 14px;
  --max: 760px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17150f;
    --card: #211e17;
    --ink: #f1ece0;
    --ink-2: #b3ab99;
    --line: #353025;
    --pen: #ff6b55;
    --pen-soft: #3a211b;
    --ok: #4cc58c;
    --ok-soft: #173025;
    --mark: #5a4d12;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
a { color: inherit; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* header / footer */
.top { border-bottom: 1px solid var(--line); background: var(--paper); position: sticky; top: 0; z-index: 10; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 12px; }
.logo { font-weight: 800; text-decoration: none; font-size: 18px; letter-spacing: -0.02em; }
.logo span { color: var(--pen); }
.nav { display: flex; gap: 6px; }
.nav a { text-decoration: none; font-size: 15px; padding: 6px 12px; border-radius: 999px; color: var(--ink-2); }
.nav a.play { background: var(--ink); color: var(--paper); font-weight: 700; }
.foot { margin-top: 64px; border-top: 1px solid var(--line); padding: 28px 0 40px; font-size: 14px; color: var(--ink-2); }
.foot nav { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 8px; }

/* hero / home */
.hero { padding: 48px 0 24px; }
.hero h1 { font-size: clamp(30px, 7vw, 44px); line-height: 1.25; margin: 0 0 12px; letter-spacing: -0.03em; }
.hero h1 em { font-style: normal; background: linear-gradient(transparent 60%, var(--mark) 60%); }
.hero p { color: var(--ink-2); margin: 0 0 24px; }
.search { width: 100%; font: inherit; padding: 14px 16px; border: 1.5px solid var(--line); border-radius: var(--radius); background: var(--card); color: var(--ink); }
.search:focus { outline: none; border-color: var(--ink); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; margin: 20px 0 8px; }
.card { display: block; text-decoration: none; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; transition: transform .12s, border-color .12s; }
.card:hover { transform: translateY(-2px); border-color: var(--ink-2); }
.card b { display: block; font-size: 22px; letter-spacing: -0.02em; }
.card b i { font-style: normal; color: var(--ink-2); font-weight: 400; margin: 0 4px; }
.card small { color: var(--ink-2); font-size: 14px; line-height: 1.5; display: block; margin-top: 4px; }
.empty { color: var(--ink-2); display: none; }

.cta { display: flex; align-items: center; justify-content: space-between; gap: 16px; background: var(--ink); color: var(--paper); border-radius: var(--radius); padding: 20px 22px; margin: 32px 0; text-decoration: none; }
.cta strong { font-size: 19px; display: block; }
.cta span { opacity: .75; font-size: 14px; }
.cta .go { flex: none; background: var(--pen); color: #fff; font-weight: 800; border-radius: 999px; padding: 10px 18px; opacity: 1; font-size: 15px; }

/* article */
.crumb { font-size: 14px; color: var(--ink-2); padding-top: 20px; }
.crumb a { text-decoration: none; }
article h1 { font-size: clamp(26px, 6vw, 36px); line-height: 1.3; letter-spacing: -0.03em; margin: 8px 0 20px; }
article h2 { font-size: 22px; margin: 36px 0 8px; letter-spacing: -0.02em; }
article ul { padding-left: 20px; }
article li { margin: 4px 0; }
article b { background: linear-gradient(transparent 62%, var(--mark) 62%); }
.one { background: var(--card); border: 1.5px solid var(--ink); border-radius: var(--radius); padding: 18px 20px; font-size: 18px; }
.one::before { content: "한 줄 정리"; display: block; font-size: 13px; font-weight: 800; color: var(--pen); margin-bottom: 4px; letter-spacing: .04em; }
.one b { background: none; color: var(--pen); }

table.ex { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 16px; background: var(--card); border-radius: var(--radius); overflow: hidden; }
table.ex th, table.ex td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.ex th { font-size: 14px; }
table.ex td.ok { color: var(--ok); font-weight: 600; }
table.ex td.ng { color: var(--ink-2); text-decoration: line-through; text-decoration-color: var(--pen); text-decoration-thickness: 2px; }

/* mini quiz */
.quiz { margin-top: 12px; display: grid; gap: 10px; }
.q { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.q p { margin: 0 0 10px; font-weight: 600; }
.q .blank { display: inline-block; min-width: 2.6em; border-bottom: 2px solid var(--ink); text-align: center; }
.q .blank.ok { color: var(--ok); border-color: var(--ok); }
.q .blank.ng { color: var(--pen); border-color: var(--pen); }
.q .opts { display: flex; gap: 8px; flex-wrap: wrap; }
.q button { font: inherit; font-weight: 700; padding: 8px 18px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--paper); color: var(--ink); cursor: pointer; }
.q button:hover:not(:disabled) { border-color: var(--ink); }
.q button:disabled { cursor: default; opacity: .55; }
.q button.right { border-color: var(--ok); background: var(--ok-soft); color: var(--ok); opacity: 1; }
.q button.wrong { border-color: var(--pen); background: var(--pen-soft); color: var(--pen); opacity: 1; }
.q .why { margin: 8px 0 0; font-size: 15px; color: var(--ink-2); font-weight: 400; display: none; }
.q.done .why { display: block; }

.related { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.related a { text-decoration: none; border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 6px 14px; font-size: 15px; }
.ad { margin: 28px 0; min-height: 0; text-align: center; }

.page h1 { font-size: 30px; margin: 32px 0 16px; }
.page h2 { font-size: 20px; margin-top: 28px; }

/* game */
.game { background: var(--card); border: 1.5px solid var(--ink); border-radius: 20px; padding: 28px 20px; margin-top: 24px; text-align: center; min-height: 420px; display: flex; flex-direction: column; justify-content: center; }
.game h1 { font-size: clamp(26px, 7vw, 34px); margin: 0 0 12px; letter-spacing: -0.03em; }
.game p { color: var(--ink-2); }
.g-btn { font: inherit; font-weight: 800; font-size: 18px; padding: 14px 32px; border-radius: 999px; border: 0; background: var(--pen); color: #fff; cursor: pointer; }
.g-btn.ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--line); }
.g-btn:active { transform: scale(.97); }
.g-keys { font-size: 13px; }
.g-hud { display: flex; justify-content: space-between; align-items: center; font-size: 15px; color: var(--ink-2); }
.g-hud b { color: var(--ink); font-size: 22px; }
.g-combo { color: var(--pen); font-weight: 800; }
.g-bar { height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; margin: 10px 0 28px; }
.g-bar i { display: block; height: 100%; width: 100%; background: var(--ok); border-radius: 99px; }
.g-bar i.low { background: var(--pen); }
p.g-q { font-size: clamp(22px, 6vw, 28px); font-weight: 700; color: var(--ink); line-height: 1.5; margin: 0 0 28px; min-height: 3em; }
.g-blank { display: inline-block; min-width: 2.4em; margin: 0 4px; border-bottom: 3px solid var(--ink); color: var(--ink-2); }
.g-blank.ok { color: var(--ok); border-color: var(--ok); }
.g-blank.ng { color: var(--pen); border-color: var(--pen); }
.g-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.g-opt { font: inherit; font-size: 24px; font-weight: 800; padding: 22px 8px; border-radius: 16px; border: 2px solid var(--line); background: var(--paper); color: var(--ink); cursor: pointer; touch-action: manipulation; }
.g-opt:hover:not(:disabled) { border-color: var(--ink); }
.g-opt.right { border-color: var(--ok); background: var(--ok-soft); color: var(--ok); }
.g-opt.wrong { border-color: var(--pen); background: var(--pen-soft); color: var(--pen); }
.g-opt:disabled { cursor: default; }
p.g-why { min-height: 1.6em; margin: 16px 0 0; font-size: 15px; opacity: 0; }
p.g-why.show { opacity: 1; color: var(--pen); }
.shake { animation: shake .3s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
p.g-grade { font-size: 22px; font-weight: 800; color: var(--ink); margin: 0; }
p.g-final { margin: 4px 0; }
p.g-final b { font-size: 64px; color: var(--pen); letter-spacing: -0.04em; }
.g-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin: 16px 0 8px; }
.g-review { text-align: left; margin-top: 20px; }
.g-review h3 { font-size: 17px; }
.g-review ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.g-review li { display: flex; justify-content: space-between; gap: 12px; align-items: center; border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; font-size: 15px; }
.g-review li a { flex: none; color: var(--pen); font-weight: 700; text-decoration: none; font-size: 14px; }
@media (max-width: 480px) { .g-review li { flex-direction: column; align-items: flex-start; gap: 2px; } }