/* kterm site — 빌드 없음, 외부 리소스 없음. 색은 대비 계산으로 골랐다(본문 AA 이상). */
:root {
  --bg: #f7f7f5;
  --bg-2: #ffffff;
  --fg: #16181c;
  --dim: #565c66;       /* #f7f7f5 위 6.6:1 */
  --line: #dcdcd7;
  --accent: #1f5fbf;    /* 흰 바탕 위 6.1:1 */
  --accent-fg: #ffffff;
  --term-bg: #111317;
  --term-fg: #e6e8eb;
  --term-dim: #8b939e;
  --term-ok: #56c271;
  --term-warn: #e3b341;
  --todo-bg: #fff3c4;
  --todo-fg: #5c4400;
  --radius: 12px;
  --max: 1080px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1013;
    --bg-2: #161a1f;
    --fg: #e8eaed;
    --dim: #a3abb5;     /* #0e1013 위 8.3:1 */
    --line: #2a3038;
    --accent: #7fb0ff;  /* #0e1013 위 8.4:1 */
    --accent-fg: #0b1a33;
    --term-bg: #07080a;
    --todo-bg: #4a3a00;
    --todo-fg: #ffe9a3;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Malgun Gothic", "Segoe UI", system-ui, sans-serif;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
code, kbd, pre, .mono { font-family: ui-monospace, "SF Mono", "D2Coding", Menlo, Consolas, monospace; font-size: .92em; }
code { background: var(--bg-2); border: 1px solid var(--line); border-radius: 6px; padding: .05em .35em; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
img, svg { max-width: 100%; }

.skip { position: absolute; left: -9999px; top: 0; }
.skip:focus { left: 16px; top: 12px; background: var(--bg-2); padding: 8px 12px; z-index: 10; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* 머리말 */
.top { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; font-weight: 700; letter-spacing: -.01em; }
.brand-mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: var(--term-bg); color: var(--term-ok); font: 700 14px/1 ui-monospace, Menlo, monospace; }
.top nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: .95rem; }
.top nav a { color: var(--dim); text-decoration: none; }
.top nav a:hover, .top nav a[aria-current="page"] { color: var(--fg); }
@media (max-width: 640px) { .top nav .opt { display: none; } }

/* 본문 블록 */
section { padding: 72px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
h1, h2, h3 { line-height: 1.3; letter-spacing: -.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5.2vw, 3.3rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1em; }
.lead { font-size: 1.15rem; color: var(--dim); max-width: 40em; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: .9rem; margin-bottom: .6em; }
.dim { color: var(--dim); }
.small { font-size: .9rem; }

/* 히어로 */
.hero { padding: 64px 0 72px; }
.hero-grid { display: grid; gap: 40px; align-items: center; }
@media (min-width: 900px) { .hero-grid { grid-template-columns: 1.05fr 1fr; } }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.btn { display: inline-flex; align-items: center; gap: 8px; min-height: 46px; padding: 0 18px; border-radius: 10px; font-weight: 600; text-decoration: none; border: 1px solid var(--line); color: var(--fg); background: var(--bg-2); }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.btn:hover { border-color: var(--accent); }

/* 터미널 그림 (장식 아닌 설명 — figure + figcaption) */
.term { background: var(--term-bg); color: var(--term-fg); border-radius: var(--radius); padding: 0 0 14px; box-shadow: 0 18px 50px -20px rgba(0,0,0,.45); overflow: hidden; }
.term-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid #22262c; font-size: .82rem; color: var(--term-dim); }
.term-bar .dot { width: 9px; height: 9px; border-radius: 50%; background: #3a3f47; }
.term-bar .badge { margin-left: auto; background: #3a2f0b; color: var(--term-warn); border-radius: 999px; padding: 1px 9px; font-weight: 600; }
.term pre { margin: 0; padding: 14px 16px 6px; white-space: pre-wrap; font-size: .86rem; line-height: 1.6; }
.term .p { color: var(--term-ok); }
.term .d { color: var(--term-dim); }
.term .w { color: var(--term-warn); }
.composer { margin: 8px 14px 0; display: flex; gap: 8px; align-items: center; background: #1a1d22; border: 1px solid #2c3139; border-radius: 10px; padding: 8px 10px; font-size: .9rem; }
.composer span { flex: 1; color: var(--term-fg); }
.composer b { background: #2c3440; color: var(--term-fg); border-radius: 7px; padding: 2px 9px; font-weight: 600; font-size: .8rem; }
.keys { display: flex; gap: 6px; margin: 8px 14px 0; flex-wrap: wrap; }
.keys kbd { background: #1d2127; color: var(--term-fg); border: 1px solid #2f353e; border-radius: 7px; padding: 3px 9px; font-size: .78rem; }
figure { margin: 0; }
figcaption { color: var(--dim); font-size: .88rem; margin-top: 10px; }

/* 문제 비교 */
.cols { display: grid; gap: 20px; }
@media (min-width: 760px) { .cols.two { grid-template-columns: 1fr 1fr; } .cols.three { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card p:last-child { margin-bottom: 0; }
.jamo { font-family: ui-monospace, Menlo, monospace; background: var(--term-bg); color: var(--term-fg); border-radius: 8px; padding: 10px 12px; margin: 12px 0; font-size: .9rem; }
.jamo .bad { color: #ff8a80; }
.jamo .good { color: var(--term-ok); }

/* 3단계 */
ol.steps { list-style: none; padding: 0; margin: 0; counter-reset: s; display: grid; gap: 20px; }
@media (min-width: 760px) { ol.steps { grid-template-columns: repeat(3, 1fr); } }
ol.steps li { counter-increment: s; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
ol.steps li::before { content: counter(s); display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--fg); color: var(--bg); font-weight: 700; margin-bottom: 12px; }

/* 기능 목록 */
.features { display: grid; gap: 28px 32px; }
@media (min-width: 760px) { .features { grid-template-columns: 1fr 1fr; } }
.features h3 { margin-bottom: .3em; }
.features p { color: var(--dim); margin: 0; }
.tag { display: inline-block; font-size: .72rem; font-weight: 700; padding: 1px 7px; border-radius: 999px; border: 1px solid var(--accent); color: var(--accent); vertical-align: 2px; margin-left: 6px; }

/* 가격 */
.plans { display: grid; gap: 20px; }
@media (min-width: 760px) { .plans { grid-template-columns: 1fr 1fr; } }
.plan { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; }
.plan.pro { border: 2px solid var(--accent); }
.price { font-size: 2rem; font-weight: 800; letter-spacing: -.02em; margin: 4px 0 2px; }
.price small { font-size: 1rem; font-weight: 600; color: var(--dim); }
.plan ul { padding-left: 1.1em; margin: 14px 0 0; }
.plan li { margin: 6px 0; }
.plan .note { margin-top: auto; padding-top: 16px; color: var(--dim); font-size: .88rem; }

/* FAQ */
details { border-bottom: 1px solid var(--line); padding: 4px 0; }
details:first-of-type { border-top: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; padding: 14px 0; list-style-position: outside; }
details > div { padding: 0 0 16px; color: var(--dim); max-width: 46em; }

/* 다운로드 */
.dl { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.dl a { display: block; padding: 16px 18px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--bg-2); color: var(--fg); text-decoration: none; }
.dl a:hover { border-color: var(--accent); }
.dl strong { display: block; }
.dl span { color: var(--dim); font-size: .88rem; }

/* 문서 페이지 */
.doc { max-width: 780px; margin: 0 auto; padding: 48px 16px 80px; }
@media (min-width: 720px) { .doc { padding: 56px 32px 96px; } }
.doc h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); }
.doc h2 { font-size: 1.35rem; margin-top: 2.2em; padding-top: .4em; border-top: 1px solid var(--line); }
.doc h3 { margin-top: 1.6em; }
.doc ul, .doc ol { padding-left: 1.3em; }
.doc li { margin: .35em 0; }
.langs { display: flex; gap: 10px; margin: 8px 0 28px; }
.table-wrap { overflow-x: auto; margin: 1em 0 1.4em; border: 1px solid var(--line); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { background: var(--bg-2); font-weight: 600; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
.box { background: var(--bg-2); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 8px; padding: 14px 16px; margin: 1.2em 0; }
.todo { background: var(--todo-bg); color: var(--todo-fg); border-radius: 4px; padding: 0 .3em; font-weight: 600; }

/* 꼬리말 */
footer { border-top: 1px solid var(--line); padding: 36px 0 48px; color: var(--dim); font-size: .9rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 18px; }
footer a { color: var(--dim); }