/* 영문법 개론 (고급 기초 문법) — /grammar/intro_grammar.jsp
   #main .gi 안에서만 적용된다. 장 내용(grammar/intro/ch/NN.jsp)은 아래 부품만 쓴다:
   .gi-h[data-lv]  소제목 (1 기초 · 2 중간 · 3 심화)   .gi-insight 핵심 통찰   .gi-why 왜 그럴까   .gi-warn 자주 틀리는 것
   .gi-ex (.bad)   예문: .en 영어 / .ko 뜻 / .why 이유    .gi-pair 두 예문 나란히    .gi-table 표    .gi-check 스스로 확인 (details)
   .gi-k 모양 표시 (have pp 같은 것)    .gi-steps 단계 목록 */
#main:has(.gi) { overflow: visible; }
#main .gi { max-width: 860px; margin: 0 auto; color: var(--ps-ink); font-size: 17px; line-height: 1.9; }
#main .gi * { box-sizing: border-box; }
#main .gi p { margin: 0 0 16px; font-size: 17px; line-height: 1.9; }
#main .gi ul, #main .gi ol { margin: 0 0 18px; padding-left: 1.35em; }
#main .gi li { margin: 0 0 6px; line-height: 1.8; }
#main .gi mark { padding: 1px 5px; border-radius: 6px; background: var(--ps-mark); color: #3d2c00; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
#main .gi .gi-k { padding: 1px 7px; border-radius: 7px; background: #eef1f6; color: #1d2b4a; font-family: var(--ps-serif); font-size: .95em; font-weight: 700; white-space: nowrap; }
#main .gi a { color: var(--ps-brand-strong); font-weight: 700; text-decoration: none; }
#main .gi a:hover { text-decoration: underline; text-underline-offset: 3px; }
#main .gi [hidden] { display: none !important; }

/* ───────── 머리 (과정 · 장) ───────── */
#main .gi .gi-hero { position: relative; margin: 0 0 26px; padding: 38px 40px 32px; border-radius: 30px; overflow: hidden; color: #fff;
    background: radial-gradient(560px 300px at 100% 0%, rgba(34, 197, 94, .32), transparent 70%), radial-gradient(440px 260px at 0% 100%, rgba(37, 99, 235, .24), transparent 70%), var(--ps-night); }
#main .gi .gi-eyebrow { display: inline-flex; align-items: center; gap: 6px; height: 26px; margin-bottom: 14px; padding: 0 12px; border-radius: 999px; background: rgba(255, 255, 255, .12); color: #c9f5d9; font-size: 12.5px; font-weight: 700; letter-spacing: .04em; }
#main .gi .gi-hero h1 { margin: 0 0 12px; color: #fff; font-size: clamp(28px, 4vw, 42px); font-weight: 800; letter-spacing: -0.04em; line-height: 1.18; }
#main .gi .gi-hero p { margin: 0 0 8px; color: rgba(255, 255, 255, .8); font-size: 16px; line-height: 1.8; }
#main .gi .gi-hero p b { color: #ffd76a; font-weight: 700; }
#main .gi .gi-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
#main .gi .gi-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 46px; padding: 0 22px; border: 1px solid var(--ps-line-strong); border-radius: 999px; background: #fff; color: var(--ps-ink) !important; font: inherit; font-size: 15px; font-weight: 800; line-height: 1; text-decoration: none !important; white-space: nowrap; cursor: pointer; transition: transform .2s var(--ps-ease), background .2s, border-color .2s; }
#main .gi .gi-btn:hover { transform: translateY(-2px); border-color: var(--ps-ink); text-decoration: none; }
#main .gi .gi-btn--primary { border-color: transparent; background: var(--ps-brand); color: #fff !important; box-shadow: 0 12px 24px -14px rgba(14, 138, 67, .8); }
#main .gi .gi-btn--primary:hover { background: var(--ps-brand-strong); }
#main .gi .gi-btn--ghost { border-color: rgba(255, 255, 255, .32); background: transparent; color: #fff !important; }
#main .gi .gi-btn--ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .08); }
#main .gi .gi-btn--sm { height: 36px; padding: 0 14px; font-size: 13.5px; }
#main .gi .gi-btn[disabled] { opacity: .5; cursor: default; transform: none; }

/* 내 상태 줄 */
#main .gi .gi-me { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin: 0 0 30px; }
#main .gi .gi-me > div { padding: 16px 18px; border: 1px solid var(--ps-line); border-radius: 18px; background: #fff; }
#main .gi .gi-me b { display: block; font-size: 24px; font-weight: 800; letter-spacing: -0.03em; line-height: 1.2; }
#main .gi .gi-me span { display: block; margin-top: 4px; color: var(--ps-ink-3); font-size: 12.5px; font-weight: 600; }
#main .gi .gi-me em { font-style: normal; color: var(--ps-brand-strong); }

/* 다섯 규칙 */
#main .gi .gi-rules { counter-reset: r; display: grid; gap: 8px; margin: 0 0 34px; padding: 0; list-style: none; }
#main .gi .gi-rules li { counter-increment: r; display: flex; align-items: center; gap: 14px; margin: 0; padding: 14px 18px; border: 1px solid var(--ps-line); border-radius: 16px; background: var(--ps-bg-soft); font-size: 16.5px; font-weight: 600; line-height: 1.5; }
#main .gi .gi-rules li::before { content: counter(r); flex: none; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 10px; background: var(--ps-ink); color: #fff; font-size: 14px; font-weight: 800; }
#main .gi .gi-rules li small { display: block; color: var(--ps-ink-3); font-size: 13.5px; font-weight: 500; }

/* 장 목록 (위에서 아래로) */
#main .gi .gi-toc { position: relative; display: grid; gap: 10px; margin: 0 0 40px; padding: 0; list-style: none; }
#main .gi .gi-toc li { margin: 0; }
#main .gi .gi-toc a { display: grid; grid-template-columns: 54px minmax(0, 1fr) auto; gap: 16px; align-items: center; padding: 16px 18px 16px 14px; border: 1px solid var(--ps-line); border-radius: 20px; background: #fff; color: var(--ps-ink) !important; text-decoration: none !important; transition: transform .25s var(--ps-ease), box-shadow .25s, border-color .25s; }
#main .gi .gi-toc a:hover { transform: translateY(-2px); border-color: var(--ps-line-strong); box-shadow: var(--ps-shadow); text-decoration: none; }
#main .gi .gi-toc .no { display: grid; place-items: center; width: 54px; height: 54px; border-radius: 16px; background: var(--ps-bg-soft); color: var(--ps-ink-2); font-size: 17px; font-weight: 800; font-variant-numeric: tabular-nums; }
#main .gi .gi-toc li.is-now a { border-color: var(--ps-brand); background: var(--ps-brand-soft); }
#main .gi .gi-toc li.is-now .no { background: var(--ps-brand); color: #fff; }
#main .gi .gi-toc li.is-done .no { background: var(--ps-ink); color: #fff; }
#main .gi .gi-toc .tt { min-width: 0; }
#main .gi .gi-toc .tt b { display: block; font-size: 17px; font-weight: 800; letter-spacing: -0.02em; line-height: 1.35; }
#main .gi .gi-toc .tt span { display: block; margin-top: 3px; color: var(--ps-ink-3); font-size: 13.5px; line-height: 1.5; }
#main .gi .gi-toc .st { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
#main .gi .gi-chip { display: inline-flex; align-items: center; height: 24px; padding: 0 10px; border-radius: 999px; background: var(--ps-bg-soft); color: var(--ps-ink-2); font-size: 12px; font-weight: 700; white-space: nowrap; }
#main .gi .gi-chip--lo { background: #fdecec; color: #c0353a; }
#main .gi .gi-chip--mid { background: #e8f0fe; color: #2563eb; }
#main .gi .gi-chip--hi { background: var(--ps-brand); color: #fff; }
#main .gi .gi-chip--read { background: #fff3d6; color: #a85a00; }
#main .gi .gi-chip--now { background: var(--ps-ink); color: #fff; }

/* 장 화면 */
#main .gi .gi-crumb { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin: 0 0 18px; color: var(--ps-ink-3); font-size: 13.5px; font-weight: 600; }
#main .gi .gi-crumb a { color: var(--ps-ink-2); font-weight: 700; }
#main .gi .gi-chapter-head { margin: 0 0 22px; padding: 0 0 22px; border-bottom: 1px solid var(--ps-line); }
#main .gi .gi-chapter-head .num { display: inline-flex; align-items: center; height: 26px; padding: 0 12px; border-radius: 999px; background: var(--ps-ink); color: #fff; font-size: 12.5px; font-weight: 800; letter-spacing: .04em; }
#main .gi .gi-chapter-head h1 { margin: 12px 0 8px; font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; letter-spacing: -0.035em; line-height: 1.25; }
#main .gi .gi-chapter-head .lead { margin: 0 0 14px; color: var(--ps-ink-2); font-size: 17px; }
#main .gi .gi-stage { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; padding: 12px 16px; border: 1px solid var(--ps-line); border-radius: 16px; background: var(--ps-bg-soft); font-size: 14px; color: var(--ps-ink-2); }
#main .gi .gi-stage b { color: var(--ps-ink); }
#main .gi .gi-lvdot { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 700; }
#main .gi .gi-lvdot::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: #22c55e; }
#main .gi .gi-lvdot.l2::before { background: #2563eb; }
#main .gi .gi-lvdot.l3::before { background: #7c3aed; }
#main .gi .gi-navrow { display: flex; justify-content: space-between; gap: 10px; margin: 36px 0 0; padding-top: 22px; border-top: 1px solid var(--ps-line); }
#main .gi .gi-navrow a { display: flex; flex-direction: column; gap: 3px; max-width: 48%; padding: 16px 20px; border: 1px solid var(--ps-line); border-radius: 18px; color: var(--ps-ink) !important; text-decoration: none !important; transition: transform .25s var(--ps-ease), box-shadow .25s; }
#main .gi .gi-navrow a:hover { transform: translateY(-2px); box-shadow: var(--ps-shadow); }
#main .gi .gi-navrow a small { color: var(--ps-ink-3); font-size: 12.5px; font-weight: 700; }
#main .gi .gi-navrow a b { font-size: 15.5px; font-weight: 800; line-height: 1.35; }
#main .gi .gi-navrow a.next { margin-left: auto; text-align: right; border-color: transparent; background: var(--ps-night); color: #fff !important; }
#main .gi .gi-navrow a.next small { color: #86efac; }

/* ───────── 본문 부품 ───────── */
#main .gi .gi-h { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 40px 0 14px; font-size: 22px; font-weight: 800; letter-spacing: -0.03em; line-height: 1.35; }
#main .gi .gi-h::before { display: none; }
#main .gi .gi-h[data-lv="2"]::before { content: "중간"; background: #e8f0fe; color: #1d4ed8; }
#main .gi .gi-h[data-lv="3"]::before { content: "심화 · TOEFL"; background: #f1eafe; color: #6d28d9; }
#main .gi h4 { margin: 24px 0 8px; font-size: 17.5px; font-weight: 800; letter-spacing: -0.02em; }
#main .gi .gi-insight { position: relative; margin: 22px 0; padding: 22px 24px 20px 28px; border: 1px solid #cfe9da; border-left: 6px solid var(--ps-brand); border-radius: 0 22px 22px 0; background: #f2fbf5; }
#main .gi .gi-insight > b { display: block; margin-bottom: 6px; color: var(--ps-brand-strong); font-size: 13px; font-weight: 800; letter-spacing: .06em; }
#main .gi .gi-insight > p:last-child { margin-bottom: 0; }
#main .gi .gi-insight p { font-size: 17.5px; font-weight: 600; }
#main .gi .gi-why { margin: 18px 0; padding: 18px 22px; border-radius: 18px; background: #fff8e1; border: 1px solid #f3e2a6; }
#main .gi .gi-why > b { display: block; margin-bottom: 4px; color: #8a5a00; font-size: 13px; font-weight: 800; letter-spacing: .06em; }
#main .gi .gi-why p:last-child { margin-bottom: 0; }
#main .gi .gi-warn { margin: 18px 0; padding: 18px 22px; border-radius: 18px; background: #fff1f1; border: 1px solid #f5c6c8; }
#main .gi .gi-warn > b { display: block; margin-bottom: 4px; color: #b42318; font-size: 13px; font-weight: 800; letter-spacing: .06em; }
#main .gi .gi-warn p:last-child { margin-bottom: 0; }
#main .gi .gi-tip { margin: 18px 0; padding: 16px 20px; border-radius: 16px; background: var(--ps-bg-soft); color: var(--ps-ink-2); font-size: 15.5px; }
#main .gi .gi-tip p:last-child { margin-bottom: 0; }

#main .gi .gi-ex { margin: 10px 0 14px; padding: 16px 20px; border: 1px solid var(--ps-line); border-radius: 16px; background: #fff; }
#main .gi .gi-ex .en { margin: 0 0 4px; font-family: var(--ps-serif); font-size: 20px; font-weight: 600; line-height: 1.55; color: #0f2a4a; }
#main .gi .gi-ex .en u { text-decoration: none; background: var(--ps-mark); border-radius: 4px; padding: 0 3px; }
#main .gi .gi-ex .ko { margin: 0; color: var(--ps-ink-2); font-size: 15px; }
#main .gi .gi-ex .why { margin: 8px 0 0; padding-top: 8px; border-top: 1px dashed var(--ps-line); color: var(--ps-ink); font-size: 15px; }
#main .gi .gi-ex.bad { border-color: #f1c7c9; background: #fff8f7; }
#main .gi .gi-ex.bad .en { color: #9a2a2a; }
#main .gi .gi-ex.bad .en::before { content: "✗ "; color: #c0353a; }
#main .gi .gi-ex.good .en::before { content: "✓ "; color: var(--ps-brand); }
#main .gi .gi-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 10px 0 14px; }
#main .gi .gi-pair .gi-ex { margin: 0; }
#main .gi .gi-exlist { margin: 10px 0 16px; padding: 6px 20px; border: 1px solid var(--ps-line); border-radius: 16px; background: #fff; }
#main .gi .gi-exlist p { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 14px; margin: 0; padding: 9px 0; border-bottom: 1px solid var(--ps-line); font-size: 15.5px; }
#main .gi .gi-exlist p:last-child { border-bottom: 0; }
#main .gi .gi-exlist p b { font-family: var(--ps-serif); font-size: 18px; font-weight: 600; color: #0f2a4a; }
#main .gi .gi-exlist p span { color: var(--ps-ink-2); }

#main .gi .gi-table { width: 100%; margin: 12px 0 20px; border: 1px solid var(--ps-line); border-radius: 16px; border-collapse: separate; border-spacing: 0; overflow: hidden; font-size: 15.5px; }
#main .gi .gi-table th, #main .gi .gi-table td { padding: 10px 14px; border-top: 1px solid var(--ps-line); text-align: left; vertical-align: top; }
#main .gi .gi-table th { background: var(--ps-bg-soft); color: var(--ps-ink-2); font-size: 13.5px; font-weight: 800; }
#main .gi .gi-table tr:first-child th, #main .gi .gi-table tr:first-child td { border-top: 0; }
#main .gi .gi-table td.en, #main .gi .gi-table b.en { font-family: var(--ps-serif); font-size: 17px; font-weight: 600; color: #0f2a4a; }
#main .gi .gi-table td.x { color: #c0353a; }

#main .gi .gi-steps { counter-reset: s; margin: 0 0 20px; padding: 0; list-style: none; }
#main .gi .gi-steps li { counter-increment: s; position: relative; margin: 0 0 8px; padding: 12px 16px 12px 52px; border: 1px solid var(--ps-line); border-radius: 14px; background: #fff; }
#main .gi .gi-steps li::before { content: counter(s); position: absolute; left: 14px; top: 12px; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 9px; background: var(--ps-ink); color: #fff; font-size: 13px; font-weight: 800; }

#main .gi .gi-check { margin: 14px 0; border: 1px solid var(--ps-line-strong); border-radius: 16px; background: #fff; }
#main .gi .gi-check summary { padding: 14px 18px; cursor: pointer; font-weight: 700; list-style: none; }
#main .gi .gi-check summary::-webkit-details-marker { display: none; }
#main .gi .gi-check summary::before { content: "스스로 확인"; display: inline-flex; align-items: center; height: 22px; margin-right: 10px; padding: 0 9px; border-radius: 999px; background: var(--ps-ink); color: #fff; font-size: 11.5px; font-weight: 800; letter-spacing: .05em; vertical-align: 2px; }
#main .gi .gi-check summary::after { content: "답 보기 ＋"; float: right; color: var(--ps-ink-3); font-size: 13px; font-weight: 700; }
#main .gi .gi-check[open] summary::after { content: "접기 −"; }
#main .gi .gi-check > div { padding: 0 18px 16px; border-top: 1px dashed var(--ps-line); }
#main .gi .gi-check > div > p:first-child { margin-top: 14px; }

/* ───────── 장 끝의 도구 ───────── */
#main .gi .gi-tools { margin: 44px 0 0; padding: 26px 28px; border: 1px solid var(--ps-line); border-radius: 24px; background: var(--ps-bg-soft); }
#main .gi .gi-tools h3 { margin: 0 0 6px; font-size: 20px; font-weight: 800; letter-spacing: -0.02em; }
#main .gi .gi-tools .sub { margin: 0 0 16px; color: var(--ps-ink-2); font-size: 15px; }
#main .gi .gi-tools .row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
#main .gi .gi-tools .me { flex: 1 1 220px; font-size: 14.5px; color: var(--ps-ink-2); }
#main .gi .gi-tools .me b { color: var(--ps-ink); font-size: 18px; }
#main .gi .gi-write { margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--ps-line-strong); }
#main .gi .gi-write label { display: block; margin: 0 0 6px; font-size: 14px; font-weight: 700; }
#main .gi .gi-write textarea { display: block; width: 100%; min-height: 96px; margin: 0 0 12px; padding: 12px 14px; border: 1.5px solid var(--ps-line-strong); border-radius: 14px; background: #fff; font: inherit; font-size: 16px; line-height: 1.7; resize: vertical; outline: 0; }
#main .gi .gi-write textarea:focus { border-color: var(--ps-brand); box-shadow: 0 0 0 4px rgba(14, 138, 67, .14); }
#main .gi .gi-write .task { margin: 0 0 12px; padding: 14px 16px; border-left: 4px solid var(--ps-brand); border-radius: 0 14px 14px 0; background: #fff; font-size: 15.5px; }
#main .gi .gi-write select { height: 38px; padding: 0 12px; border: 1.5px solid var(--ps-line-strong); border-radius: 12px; background: #fff; font: inherit; font-size: 14px; }
#main .gi .gi-write .status { margin: 10px 0 0; color: var(--ps-ink-3); font-size: 13.5px; }
#main .gi .gi-fb { margin-top: 16px; padding: 18px 20px; border: 1px solid #cfe9da; border-radius: 18px; background: #fff; font-size: 15.5px; }
#main .gi .gi-fb h5 { margin: 14px 0 6px; font-size: 14px; font-weight: 800; color: var(--ps-brand-strong); letter-spacing: .03em; }
#main .gi .gi-fb h5:first-child { margin-top: 0; }
#main .gi .gi-fb h4 { margin: 0 0 10px; font-size: 18px; }
#main .gi .gi-fb ol { padding-left: 1.3em; }
#main .gi .gi-fb .en { font-family: var(--ps-serif); font-size: 18px; font-weight: 600; color: #0f2a4a; }
#main .gi .gi-fb .focus { margin: 8px 0; padding: 10px 14px; border-left: 3px solid #e0a100; border-radius: 0 12px 12px 0; background: #fff8e1; }
#main .gi .gi-fb .focus b { display: block; }
#main .gi .gi-fb p { margin: 0 0 8px; font-size: 15.5px; }

/* ───────── 다음 단계 ───────── */
#main .gi .gi-next { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 10px 0 0; }
#main .gi .gi-next a { display: flex; flex-direction: column; gap: 4px; padding: 20px 22px; border: 1px solid var(--ps-line); border-radius: 20px; background: #fff; color: var(--ps-ink) !important; text-decoration: none !important; transition: transform .25s var(--ps-ease), box-shadow .25s; }
#main .gi .gi-next a:hover { transform: translateY(-3px); box-shadow: var(--ps-shadow); }
#main .gi .gi-next small { color: var(--ps-brand); font-size: 12.5px; font-weight: 800; }
#main .gi .gi-next b { font-size: 17px; font-weight: 800; letter-spacing: -0.02em; }
#main .gi .gi-next span { color: var(--ps-ink-3); font-size: 14px; line-height: 1.6; }

@media (max-width: 760px) {
    #main .gi, #main .gi p { font-size: 16px; }
    #main .gi .gi-hero { padding: 28px 22px 24px; border-radius: 24px; }
    #main .gi .gi-me { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    #main .gi .gi-toc a { grid-template-columns: 42px minmax(0, 1fr); }
    #main .gi .gi-toc .no { width: 42px; height: 42px; }
    #main .gi .gi-toc .st { grid-column: 1 / -1; flex-direction: row; justify-content: flex-start; }
    #main .gi .gi-pair, #main .gi .gi-next { grid-template-columns: minmax(0, 1fr); }
    #main .gi .gi-exlist p { grid-template-columns: minmax(0, 1fr); gap: 2px; }
    #main .gi .gi-ex .en { font-size: 18px; }
    #main .gi .gi-navrow { flex-direction: column; }
    #main .gi .gi-navrow a { max-width: none; }
    #main .gi .gi-tools { padding: 20px 18px; }
    #main .gi .gi-table { display: block; overflow-x: auto; }
}

/* 이 장의 세부 능력 (course.jsp, 2026-10-11) */
#main .gi .gi-fine { margin: 34px 0 10px; }
#main .gi .gi-fine h3 { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; margin: 0 0 12px; font-size: 20px; font-weight: 800; letter-spacing: -0.02em; }
#main .gi .gi-fine h3 small { color: var(--ps-ink-3); font-size: 13.5px; font-weight: 600; }
#main .gi .gi-fine__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
#main .gi .gi-fine__item { display: grid; grid-template-columns: 26px minmax(0, 1fr) auto; align-items: center; gap: 8px; padding: 9px 12px; border: 1px solid var(--ps-line); border-radius: 12px; background: #fff; color: var(--ps-ink); font-size: 14.5px; text-decoration: none; transition: border-color .15s, transform .15s; }
#main .gi .gi-fine__item:hover { border-color: var(--ps-brand); transform: translateY(-1px); }
#main .gi .gi-fine__item .no { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; border-radius: 50%; background: var(--ps-bg-soft); color: var(--ps-ink-3); font-size: 11.5px; font-weight: 800; }
#main .gi .gi-fine__item .nm { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#main .gi .gi-fine__item .sc { font-size: 12.5px; font-weight: 800; color: var(--ps-brand); white-space: nowrap; }
#main .gi .gi-fine__item.is-hi { background: #eaf7ef; border-color: #cfe9da; }
#main .gi .gi-fine__item.is-hi .sc { color: var(--ps-brand-strong, #0b6b34); }
#main .gi .gi-fine__item.is-mid { background: #eef4ff; border-color: #cfdcf7; }
#main .gi .gi-fine__item.is-mid .sc { color: #1d4ed8; }
#main .gi .gi-fine__item.is-lo { background: #fff1f1; border-color: #f5c6c8; }
#main .gi .gi-fine__item.is-lo .sc { color: #b42318; }
@media (max-width: 640px) { #main .gi .gi-fine__grid { grid-template-columns: minmax(0, 1fr); } }

/* 강의 영상 (YouTube, 누르면 이 자리에서 재생) */
#main .gi .gi-video { margin: 0 0 22px; }
#main .gi .gi-video__play { position: relative; display: block; width: 100%; padding: 0; border: 0; border-radius: 18px; overflow: hidden; background: #0b1426; cursor: pointer; aspect-ratio: 16 / 9; }
#main .gi .gi-video__play img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .55; transition: opacity .2s, transform .3s; }
#main .gi .gi-video__play:hover img { opacity: .7; transform: scale(1.02); }
#main .gi .gi-video__play span { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: flex; flex-direction: column; align-items: center; gap: 6px; color: #fff; font-size: 20px; font-weight: 800; text-shadow: 0 2px 12px rgba(0,0,0,.6); white-space: nowrap; }
#main .gi .gi-video__play span small { font-size: 13.5px; font-weight: 600; color: rgba(255,255,255,.85); }
#main .gi .gi-video__play span i { display: grid; place-items: center; width: 72px; height: 72px; border-radius: 50%; background: var(--ps-brand); box-shadow: 0 12px 30px -10px rgba(0,0,0,.7); }
#main .gi .gi-video__play span i::before { content: ""; margin-left: 6px; border-style: solid; border-width: 14px 0 14px 24px; border-color: transparent transparent transparent #fff; }
#main .gi .gi-video iframe { display: block; width: 100%; aspect-ratio: 16 / 9; border: 0; border-radius: 18px; background: #000; }

/* 이전 단계 (2026-10-11): 개론 맨 아래에서만 왕초보 문법으로 */
.gi-prevstep { display: flex; gap: 14px; align-items: flex-start; margin: 34px 0 10px; padding: 16px 18px; border: 1px dashed var(--ps-line, #e5e7eb); border-radius: 16px; background: #fafbfc; }
.gi-prevstep > span { flex: none; padding: 4px 10px; border-radius: 999px; background: #e2e8f0; color: #475569; font-size: 12px; font-weight: 800; letter-spacing: .04em; }
.gi-prevstep b { font-size: 15px; }
.gi-prevstep b a { color: var(--ps-ink, #0f172a); text-decoration: none; }
.gi-prevstep b a:hover { text-decoration: underline; }
.gi-prevstep small { display: block; margin-top: 3px; font-size: 13px; line-height: 1.6; color: var(--ps-ink-3, #64748b); }