/* 소개 페이지(/, /en/, /ja/) 전용. 정책 페이지는 style.css만 쓴다.
   색은 앱 디자인 명세 v2의 토큰을 그대로 쓴다: 따뜻한 중성 배경 + 먹색, 파랑은 AI 기능에만. */
:root {
  --bg: #FAFAF8; --bg-side: #F3F2EE; --bg-sel: #E7E5DF; --surface: #FFFFFF; --soft: #F6F5F1; --btn2: #F0EFEA;
  --text: #2E2E2B; --text2: #66655F; --text3: #8A8881;
  --ai: #3366CC; --ai-press: #2C5AB7; --ai-soft: #EAF1FF; --ai-on: #FFFFFF;
  --mark: #B34750; --stroke: #E7E5DE; --divider: #ECEAE4;
  --ink: #2E2E2B; --ink-on: #FAFAF8; --logo: #1E2A45; --logo-ai: #2F6BEB;
  --shadow: 0 1px 2px rgba(46,46,43,.06), 0 12px 40px rgba(46,46,43,.10);
  --radius: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1F201E; --bg-side: #242521; --bg-sel: #31332E; --surface: #2A2B28; --soft: #2F302D; --btn2: #2D2E2A;
    --text: #F1F0EB; --text2: #C6C4BC; --text3: #9B998F;
    --ai: #6D92EA; --ai-press: #5B82DF; --ai-soft: #2A3B63; --ai-on: #FFFFFF;
    --mark: #D06A74; --stroke: #3A3B36; --divider: #33342F;
    --ink: #F1F0EB; --ink-on: #1F201E; --logo: #F1F0EB; --logo-ai: #6D92EA;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 40px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  font-size: 17px; line-height: 1.65; letter-spacing: -0.01em;
  word-break: keep-all; overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}
body.ja { font-family: "Pretendard JP Variable", "Pretendard JP", -apple-system, BlinkMacSystemFont, system-ui, "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif; letter-spacing: 0; line-break: strict; word-break: normal; }
a { color: inherit; }
img, svg { display: block; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.eyebrow { display: inline-block; font-size: .82rem; font-weight: 600; letter-spacing: .02em; color: var(--text2); margin-bottom: 14px; }
h1, h2, h3 { letter-spacing: -0.025em; line-height: 1.25; margin: 0; }
body.ja h1, body.ja h2, body.ja h3 { letter-spacing: 0; }
section { padding: 96px 0; }
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(1.7rem, 3.6vw, 2.4rem); font-weight: 700; }
.section-head p { color: var(--text2); margin: 14px 0 0; font-size: 1.05rem; }

/* 맨 위 메뉴 */
.nav { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px); border-bottom: 1px solid transparent; transition: border-color .2s; }
.nav.scrolled { border-bottom-color: var(--divider); }
.nav .container { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 9px; text-decoration: none; font-weight: 700; font-size: 1.12rem; letter-spacing: -0.02em; }
.brand svg { width: 30px; height: 30px; }
.nav-links { display: flex; gap: 24px; margin-left: 12px; }
.nav-links a { text-decoration: none; color: var(--text2); font-size: .93rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.lang { position: relative; }
.lang summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 10px; font-size: .9rem; font-weight: 500; color: var(--text2); }
.lang summary::-webkit-details-marker { display: none; }
.lang summary:hover, .lang[open] summary { background: var(--btn2); color: var(--text); }
.lang summary svg { width: 17px; height: 17px; }
.lang ul { position: absolute; right: 0; top: calc(100% + 6px); margin: 0; padding: 6px; list-style: none; background: var(--surface); border: 1px solid var(--stroke); border-radius: 12px; box-shadow: var(--shadow); min-width: 140px; }
.lang li a { display: block; padding: 8px 12px; border-radius: 8px; text-decoration: none; font-size: .92rem; }
.lang li a:hover { background: var(--soft); }
.lang li a[aria-current] { font-weight: 700; }

/* 버튼 */
.btn { font: inherit; display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 22px; border-radius: 12px; font-weight: 600; font-size: .98rem; text-decoration: none; border: 0; cursor: pointer; white-space: nowrap; }
.btn svg { width: 19px; height: 19px; }
.btn-ink { background: var(--ink); color: var(--ink-on); }
.btn-ink:hover { opacity: .9; }
.btn-soft { background: var(--btn2); color: var(--text); }
.btn-soft:hover { background: var(--bg-sel); }
.btn-sm { height: 38px; padding: 0 14px; font-size: .9rem; border-radius: 10px; }

/* 첫 화면 */
.hero { padding: 80px 0 72px; }
.hero .container { display: flex; flex-direction: column; align-items: center; gap: 56px; text-align: center; }
.hero-text { max-width: 760px; display: flex; flex-direction: column; align-items: center; }
.hero-shot { width: 100%; max-width: 1080px; text-align: left; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 4rem); font-weight: 800; letter-spacing: -0.035em; }
body.ja .hero h1 { font-size: clamp(2rem, 4.6vw, 3.3rem); letter-spacing: -0.01em; }
.hero h1 .ai { color: var(--ai); }
.hero .lead { font-size: 1.18rem; color: var(--text2); margin: 22px 0 32px; max-width: 32em; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.hero .avail { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 18px; margin-top: 24px; color: var(--text3); font-size: .88rem; }
.hero .avail span { display: inline-flex; align-items: center; gap: 6px; }
.hero .avail svg { width: 16px; height: 16px; }

/* 앱 화면 예시 (태블릿) */
.device { position: relative; background: #121311; border-radius: 26px; padding: 10px; box-shadow: var(--shadow); }
.screen { background: var(--bg); border-radius: 18px; overflow: hidden; display: grid; grid-template-columns: 34% 66%; aspect-ratio: 16 / 10; font-size: clamp(9px, 1.25vw, 15px); line-height: 1.5; color: var(--text); }
.screen .side { background: var(--bg-side); padding: 14px 10px; display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.screen .side .search { background: var(--bg-input, var(--surface)); border-radius: 9px; padding: 6px 9px; color: var(--text3); margin-bottom: 8px; font-size: .92em; }
.screen .item { padding: 8px 9px; border-radius: 9px; min-width: 0; }
.screen .item b { display: block; font-weight: 600; font-size: .96em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.screen .item span { color: var(--text3); font-size: .88em; }
.screen .item.sel { background: var(--bg-sel); }
.screen .rec { margin-top: auto; background: var(--ink); color: var(--ink-on); border-radius: 10px; text-align: center; padding: 8px; font-weight: 600; font-size: .96em; }
.screen .main { padding: 14px 18px; display: flex; flex-direction: column; min-width: 0; }
.screen .top { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.screen .top b { font-size: 1.17em; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.seg { display: inline-flex; background: var(--btn2); border-radius: 9px; padding: 2px; flex: none; }
.seg i { font-style: normal; padding: 3px 10px; border-radius: 7px; font-size: .92em; font-weight: 600; color: var(--text2); }
.seg i.on { background: var(--ink); color: var(--ink-on); }
.screen .lines { display: flex; flex-direction: column; gap: 1em; overflow: hidden; }
.screen .line { display: grid; grid-template-columns: 38px 1fr; gap: 6px; }
.screen .line time { color: var(--text3); font-size: .88em; padding-top: 1px; font-variant-numeric: tabular-nums; }
.screen .line.now { background: var(--soft); border-radius: 8px; margin: 0 -6px; padding: 4px 6px; }
.screen .line em { font-style: normal; color: var(--ai); font-weight: 600; }
.screen .line .bm { display: inline-block; background: color-mix(in srgb, var(--mark) 14%, transparent); color: var(--mark); border-radius: 5px; padding: 0 4px; font-size: .83em; font-weight: 600; }
.screen .bar { margin-top: auto; display: flex; align-items: center; gap: 10px; background: var(--surface); border-radius: 11px; padding: 7px 10px; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.screen .play { width: 22px; height: 22px; border-radius: 50%; background: var(--ink); flex: none; display: grid; place-items: center; }
.screen .play::after { content: ""; border-left: 7px solid var(--ink-on); border-top: 4.5px solid transparent; border-bottom: 4.5px solid transparent; margin-left: 2px; }
.screen .track { flex: 1; height: 3px; background: var(--bg-sel); border-radius: 2px; position: relative; }
.screen .track::after { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 38%; background: var(--ink); border-radius: 2px; }
.screen .ainote { background: var(--ai-soft); color: var(--ai); border-radius: 8px; padding: 3px 9px; font-weight: 600; font-size: .92em; flex: none; }
.caption { color: var(--text3); font-size: .8rem; margin-top: 12px; text-align: center; }
.device.shot { padding: 12px; }
.device.shot img { width: 100%; height: auto; border-radius: 16px; }

/* 숫자 띠 */
.stats { padding: 0 0 24px; }
.stats .grid { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); }
.stat { padding: 28px 30px; }
.stat + .stat { border-left: 1px solid var(--divider); }
.stat b { display: block; font-size: clamp(1.6rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -0.03em; }
.stat span { color: var(--text2); font-size: .95rem; }

/* 보정 예시 */
.demo { background: var(--bg-side); }
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.tabs button { font: inherit; font-size: .95rem; font-weight: 600; padding: 9px 18px; border-radius: 999px; border: 0; background: var(--btn2); color: var(--text2); cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--ink); color: var(--ink-on); }
.compare { display: grid; grid-template-columns: 1fr auto 1fr; gap: 16px; align-items: stretch; }
.panel { background: var(--surface); border-radius: var(--radius); padding: 26px 28px; box-shadow: 0 1px 2px rgba(0,0,0,.04); }
.panel h3 { font-size: .85rem; font-weight: 600; color: var(--text3); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.panel.ai h3 { color: var(--ai); }
.panel p { margin: 0; font-size: 1.12rem; line-height: 1.8; }
.panel.raw p { color: var(--text2); }
.panel .err { text-decoration: underline wavy color-mix(in srgb, var(--mark) 70%, transparent); text-underline-offset: 4px; text-decoration-thickness: 1.5px; }
.panel mark { background: var(--ai-soft); color: var(--ai); font-weight: 650; border-radius: 5px; padding: 1px 2px; }
.arrow { display: grid; place-items: center; color: var(--ai); }
.arrow span { width: 44px; height: 44px; border-radius: 50%; background: var(--ai); color: var(--ai-on); display: grid; place-items: center; }
.arrow svg { width: 20px; height: 20px; }
.demo .note { color: var(--text3); font-size: .85rem; margin-top: 16px; }
.fields { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; align-items: center; color: var(--text2); font-size: .95rem; }
.chip { background: var(--surface); border: 1px solid var(--stroke); border-radius: 999px; padding: 5px 14px; font-weight: 500; color: var(--text); }

/* 사용 방법 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: step; }
.step { padding: 28px; background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); }
.step .n { width: 34px; height: 34px; border-radius: 10px; background: var(--btn2); display: grid; place-items: center; font-weight: 700; margin-bottom: 18px; }
.step.ai .n { background: var(--ai-soft); color: var(--ai); }
.step h3 { font-size: 1.2rem; margin-bottom: 8px; }
.step p { margin: 0; color: var(--text2); }

/* 기능 */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px 32px; }
.feature .ic { width: 44px; height: 44px; border-radius: 12px; background: var(--btn2); display: grid; place-items: center; margin-bottom: 16px; }
.feature .ic svg { width: 22px; height: 22px; }
.feature.ai .ic { background: var(--ai-soft); color: var(--ai); }
.feature h3 { font-size: 1.1rem; margin-bottom: 6px; }
.feature p { margin: 0; color: var(--text2); font-size: .98rem; }

/* 개인정보 (먹색 띠) */
.privacy { background: #2E2E2B; color: #F1F0EB; }
@media (prefers-color-scheme: dark) { .privacy { background: #2A2B28; } }
.privacy .section-head p { color: #C6C4BC; }
.privacy .eyebrow { color: #9B998F; }
.pgrid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.pitem { border-top: 1px solid #4A4B45; padding-top: 22px; }
.pitem svg { width: 26px; height: 26px; margin-bottom: 14px; color: #F1F0EB; }
.pitem h3 { font-size: 1.12rem; margin-bottom: 6px; }
.pitem p { margin: 0; color: #C6C4BC; font-size: .97rem; }
.privacy .more { margin-top: 36px; }
.privacy .more a { color: #F1F0EB; font-weight: 600; text-underline-offset: 4px; }

/* 강의 자료 (2026-10-20 리뉴얼) */
.eyebrow svg { display: inline-block; width: 16px; height: 16px; vertical-align: -3px; margin-right: 6px; }
.materials .eyebrow { color: var(--ai); }
.mflow { display: grid; grid-template-columns: 1fr auto 1fr auto 1.25fr; gap: 16px; align-items: stretch; }
.mslide, .mterms, .mresult { background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 22px 24px; min-width: 0; }
.mslide-bar { display: flex; align-items: center; gap: 5px; margin-bottom: 16px; }
.mslide-bar i { width: 8px; height: 8px; border-radius: 50%; background: var(--bg-sel); }
.mslide-bar span { margin-left: auto; font-size: .72rem; font-weight: 700; color: var(--mark); background: color-mix(in srgb, var(--mark) 12%, transparent); border-radius: 5px; padding: 1px 6px; }
.mslide b { display: block; font-size: 1.05rem; margin-bottom: 10px; }
.mslide ul { margin: 0; padding-left: 1.1em; color: var(--text2); font-size: .93rem; }
.mslide li + li { margin-top: 4px; }
.mterms h3, .mresult h3 { font-size: .85rem; font-weight: 600; color: var(--text3); margin-bottom: 12px; }
.mresult h3.ai { color: var(--ai); margin-top: 16px; }
.mchips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip.ai { background: var(--ai-soft); border-color: transparent; color: var(--ai); font-weight: 600; font-size: .9rem; }
.mresult p { margin: 0; line-height: 1.75; }
.mresult p.raw { color: var(--text2); }
.mresult .err { text-decoration: underline wavy color-mix(in srgb, var(--mark) 70%, transparent); text-underline-offset: 4px; text-decoration-thickness: 1.5px; }
.mresult mark { background: var(--ai-soft); color: var(--ai); font-weight: 650; border-radius: 5px; padding: 1px 2px; }
.mpoints { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-top: 40px; }
.mpoint { border-top: 2px solid var(--ai-soft); padding-top: 18px; }
.mpoint h3 { font-size: 1.08rem; margin-bottom: 6px; }
.mpoint p { margin: 0; color: var(--text2); font-size: .97rem; }
.materials .note, .student .note { color: var(--text3); font-size: .85rem; margin-top: 24px; }

/* 학생 */
.student { background: var(--bg-side); }
.sgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.scard { background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 28px; }
.scard .ic { width: 44px; height: 44px; border-radius: 12px; background: var(--btn2); display: grid; place-items: center; margin-bottom: 16px; }
.scard .ic svg { width: 22px; height: 22px; }
.scard h3 { font-size: 1.15rem; margin-bottom: 6px; }
.scard p { margin: 0; color: var(--text2); font-size: .98rem; }

/* 자주 묻는 질문 */
#faq .section-head { margin-left: auto; margin-right: auto; text-align: center; }
.faq { max-width: 780px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--divider); }
.faq summary { list-style: none; cursor: pointer; padding: 22px 40px 22px 0; font-weight: 600; font-size: 1.07rem; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 6px; top: 50%; width: 9px; height: 9px; border-right: 2px solid var(--text3); border-bottom: 2px solid var(--text3); transform: translateY(-70%) rotate(45deg); transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq details p { margin: -6px 0 22px; color: var(--text2); }
.faq details a { color: var(--text); text-underline-offset: 3px; }

/* 마지막 안내 */
.cta { padding: 0 0 96px; }
.cta .box { background: var(--surface); border: 1px solid var(--stroke); border-radius: 24px; padding: 56px 32px; text-align: center; }
.cta svg.logo { width: 64px; height: 64px; margin: 0 auto 20px; }
.cta h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); }
.cta p { color: var(--text2); margin: 12px 0 28px; }

/* 맨 아래 */
footer { border-top: 1px solid var(--divider); padding: 40px 0 56px; color: var(--text3); font-size: .88rem; }
footer .container { display: flex; flex-wrap: wrap; gap: 20px 40px; justify-content: space-between; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
footer a { color: var(--text2); text-decoration: none; }
footer a:hover { color: var(--text); text-decoration: underline; }
footer p { margin: 0; }

/* 좁은 화면 */
@media (max-width: 960px) {
  .hero .container { gap: 40px; }
  .nav-links { display: none; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .stats .grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--divider); }
  .pgrid { grid-template-columns: repeat(2, 1fr); }
  .mflow { grid-template-columns: 1fr; }
  .mflow .arrow span { transform: rotate(90deg); }
  .mpoints, .sgrid { grid-template-columns: 1fr; gap: 20px; }
}
@media (max-width: 720px) {
  section { padding: 72px 0; }
  .hero { padding: 40px 0 64px; }
  .stats .grid { grid-template-columns: 1fr; }
  .stat + .stat { border-left: 0; border-top: 1px solid var(--divider); }
  .stat { padding: 20px 22px; }
  .compare { grid-template-columns: 1fr; }
  .arrow span { transform: rotate(90deg); }
  .steps, .pgrid { grid-template-columns: 1fr; }
  .stats .grid { grid-template-columns: 1fr; }
  .stat:nth-child(n+2) { border-top: 1px solid var(--divider); }
  .features { grid-template-columns: 1fr; gap: 28px; }
  .panel { padding: 22px; }
  .panel p { font-size: 1.04rem; }
  .screen { grid-template-columns: 1fr; aspect-ratio: auto; }
  .screen .side { display: none; }
  .nav .launch { display: none; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* 내 계정 (/account) */
.acct-main { padding-top: 48px; padding-bottom: 96px; min-height: 60vh; }
.acct-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 16px 24px; margin-bottom: 28px; }
.acct-head h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 800; }
.acct-head .lead { color: var(--text2); margin: 10px 0 0; max-width: 36em; }
.acct-who { display: flex; align-items: center; gap: 12px; color: var(--text2); font-size: .92rem; }
.acct-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 16px; margin-bottom: 16px; }
.acct-grid .big { grid-row: span 2; }
.acct-card { background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 26px 28px; }
.acct-card p { margin: 0; }
.acct-card.center { text-align: center; padding: 48px 28px; }
.acct-card .label { display: block; color: var(--text2); font-size: .9rem; font-weight: 600; margin-bottom: 6px; }
.acct-card .num { display: block; font-size: clamp(2.6rem, 6vw, 3.6rem); font-weight: 800; letter-spacing: -0.035em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.acct-card .num small { font-size: 1rem; font-weight: 600; color: var(--text2); margin-left: 8px; letter-spacing: 0; }
.acct-card .plan { display: block; font-size: 1.6rem; font-weight: 800; letter-spacing: -0.02em; }
.acct-card .muted { color: var(--text2); font-size: .95rem; margin-top: 8px; }
.acct-card .link { display: inline-block; margin-top: 12px; color: var(--text); font-weight: 600; font-size: .92rem; text-underline-offset: 3px; }
.acct-card dl { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 26px 0 0; padding-top: 20px; border-top: 1px solid var(--divider); }
.acct-card dt { color: var(--text3); font-size: .85rem; }
.acct-card dd { margin: 2px 0 0; font-weight: 700; font-size: 1.1rem; font-variant-numeric: tabular-nums; }
.acct-card.soon { background: var(--soft); border-style: dashed; }
.acct-card.danger { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.acct-card.danger b { color: var(--mark); }
.acct-note { background: var(--ai-soft); color: var(--ai); border-radius: 12px; padding: 12px 16px; margin-bottom: 16px; font-weight: 500; font-size: .95rem; }
.btn svg { flex: none; }
#signin svg { width: 20px; height: 20px; background: #fff; border-radius: 50%; padding: 2px; }
.btn-danger { background: transparent; color: var(--mark); border: 1px solid color-mix(in srgb, var(--mark) 45%, transparent); }
.btn-danger:hover:not(:disabled) { background: color-mix(in srgb, var(--mark) 10%, transparent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.err { color: var(--mark); font-size: .92rem; margin-top: 12px !important; }
dialog { border: 0; border-radius: 20px; padding: 28px; max-width: 560px; width: calc(100% - 32px); background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(20, 20, 18, .45); }
dialog h2 { font-size: 1.3rem; margin-bottom: 12px; }
dialog p { color: var(--text2); font-size: .94rem; margin: 0 0 10px; }
dialog .chk { display: flex; gap: 10px; align-items: center; margin: 18px 0 4px; font-weight: 600; }
dialog .chk input { width: 18px; height: 18px; accent-color: var(--mark); }
dialog .row { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
@media (max-width: 720px) {
  .acct-grid { grid-template-columns: 1fr; }
  .acct-grid .big { grid-row: auto; }
  .acct-card { padding: 22px; }
  .acct-card dl { grid-template-columns: 1fr 1fr; }
}

/* 관리자 화면 (/admin) */
.brand .badge { font-size: .72rem; font-weight: 700; padding: 3px 8px; border-radius: 999px; background: var(--btn2); color: var(--text2); margin-left: 4px; letter-spacing: 0; }
.adm-sec { padding: 0; margin: 0 0 40px; }
.adm-sec h2 { font-size: 1.25rem; font-weight: 800; margin-bottom: 14px; }
.adm-sec h2 small { font-size: .9rem; font-weight: 600; color: var(--text2); margin-left: 8px; }
.adm-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.adm-switch { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.adm-switch.on { border-color: color-mix(in srgb, var(--mark) 55%, transparent); background: color-mix(in srgb, var(--mark) 7%, var(--surface)); }
.adm-switch.on b { color: var(--mark); }
.toggle { flex: none; width: 52px; height: 30px; border-radius: 999px; border: 0; padding: 3px; background: var(--bg-sel); cursor: pointer; transition: background .15s; }
.toggle span { display: block; width: 24px; height: 24px; border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.2); transition: transform .15s; }
.toggle[aria-checked="true"] { background: var(--mark); }
.toggle[aria-checked="true"] span { transform: translateX(22px); }
.toggle:disabled { opacity: .5; }
.adm-ro { color: var(--text2); font-size: .9rem; margin: 0; }
.adm-prov { margin-bottom: 14px; }
.adm-prov .row select { flex: 0 1 180px; }
.adm-prov .sel-label { color: var(--text2); font-size: .9rem; font-weight: 600; }
.acct-card .num.small, .adm-sec .acct-card .num { font-size: clamp(2rem, 4.5vw, 2.6rem); }
.bar { height: 8px; border-radius: 999px; background: var(--btn2); margin: 14px 0 4px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--ink); border-radius: inherit; }
.bar.warn i { background: var(--mark); }
.adm-week .week { display: grid; grid-template-columns: repeat(7, 1fr); gap: 10px; height: 150px; align-items: end; margin-top: 10px; }
.adm-week .col { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; gap: 6px; }
.adm-week .col i { display: block; width: 100%; max-width: 44px; background: color-mix(in srgb, var(--text3) 40%, transparent); border-radius: 6px 6px 2px 2px; }
.adm-week .col:last-child i { background: var(--ink); }
.adm-week .col:last-child .d { color: var(--text); font-weight: 700; }
.adm-week .v { font-size: .78rem; color: var(--text2); font-variant-numeric: tabular-nums; }
.adm-week .d { font-size: .8rem; color: var(--text3); }
.adm-form label { display: block; font-weight: 700; margin-bottom: 8px; }
.adm-form .hint { display: block; font-weight: 400; color: var(--text2); font-size: .88rem; margin-top: 2px; }
.adm-form .row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.adm-form input[type=text], .adm-form input[type=email], .adm-form input[type=number], .adm-form select {
  font: inherit; font-size: .95rem; height: 38px; padding: 0 12px; border-radius: 10px; border: 1px solid var(--stroke); background: var(--bg); color: var(--text); min-width: 0; flex: 1 1 160px; }
.adm-form input:focus, .adm-form select:focus { outline: 2px solid var(--ai); outline-offset: 1px; }
.adm-form textarea, .adm-form input[type=datetime-local] {
  font: inherit; font-size: .95rem; color: var(--text); background: var(--bg); border: 1px solid var(--stroke); border-radius: 10px; padding: 9px 12px;
}
.adm-form textarea { display: block; width: 100%; box-sizing: border-box; margin-top: 8px; resize: vertical; line-height: 1.55; }
.adm-ann-form { display: grid; gap: 12px; margin-bottom: 14px; }
.adm-ann-form .adm-lang summary { cursor: pointer; font-weight: 700; color: var(--text2); margin-bottom: 8px; }
.adm-ann-form .adm-lang input[type=text] { width: 100%; box-sizing: border-box; }
.adm-anns { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.adm-anns li { border: 1px solid var(--divider); border-radius: 12px; padding: 12px 14px; display: grid; gap: 6px; }
.adm-anns li.lv-highlight { border-color: color-mix(in srgb, #4BA3E3 55%, transparent); background: color-mix(in srgb, #4BA3E3 8%, var(--surface)); }
.adm-anns li.lv-danger { border-color: color-mix(in srgb, #E5484D 55%, transparent); background: color-mix(in srgb, #E5484D 8%, var(--surface)); }
.adm-anns .row { display: flex; flex-wrap: wrap; gap: 8px; }
.adm-anns p { margin: 0; }
.adm-ann-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.adm-form .chk { display: inline-flex; align-items: center; gap: 8px; font-weight: 500; font-size: .9rem; margin: 0; }
.adm-user { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--divider); }
.adm-user-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chip { font-size: .8rem; font-weight: 600; padding: 3px 10px; border-radius: 999px; background: var(--btn2); color: var(--text2); }
.chip.ai { background: var(--ai-soft); color: var(--ai); }
.acct-card .adm-dl { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 16px 0; padding: 0; border: 0; }
.adm-dl dt { color: var(--text3); font-size: .85rem; }
.adm-dl dd { margin: 2px 0 0; font-weight: 700; font-size: 1.15rem; font-variant-numeric: tabular-nums; }
.adm-forms { display: grid; gap: 18px; margin-top: 8px; }
.adm-list, .adm-log { list-style: none; margin: 18px 0 10px; padding: 0; }
.adm-list li { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--divider); font-size: .95rem; overflow-wrap: anywhere; }
.adm-log { margin: 0; }
.adm-log li { display: flex; gap: 14px; padding: 8px 0; border-bottom: 1px solid var(--divider); font-size: .93rem; }
.adm-log li:last-child, .adm-list li:last-child { border-bottom: 0; }
.adm-log time { flex: none; color: var(--text3); font-variant-numeric: tabular-nums; min-width: 9.5em; }
.muted.small { font-size: .85rem; }
#toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none; background: var(--ink); color: var(--ink-on); padding: 12px 18px; border-radius: 12px; font-weight: 600; font-size: .94rem; transition: opacity .2s, transform .2s; max-width: calc(100% - 32px); z-index: 50; }
#toast.show { opacity: 1; transform: translate(-50%, 0); }
#toast.bad { background: var(--mark); color: #fff; }
@media (max-width: 760px) {
  .adm-grid { grid-template-columns: 1fr; }
  .acct-card .adm-dl { grid-template-columns: 1fr 1fr; }
  .adm-log li { flex-direction: column; gap: 0; }
}

/* 학생 인증 · 웹 상품 (/account, /admin) */
.acct-card.stu.approved { border-color: color-mix(in srgb, var(--ai) 45%, transparent); }
.acct-card.stu .btn { margin-top: 14px; }
.shop { margin: 32px 0; padding: 0; }
.shop h2 { font-size: 1.25rem; font-weight: 800; margin-bottom: 4px; }
.shop > .muted { color: var(--text2); margin: 0 0 18px; }
.shop-group { margin-bottom: 20px; }
.shop-group h3 { font-size: 1rem; font-weight: 700; margin: 0 0 4px; }
.shop-group .muted.small { color: var(--text2); margin: 0 0 8px; }
.shop-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 12px; margin-top: 10px; }
.shop-item { display: flex; flex-direction: column; gap: 4px; background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 18px 20px; }
.shop-item .price { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.shop-item .price small { font-size: .9rem; font-weight: 600; color: var(--text2); margin-left: 2px; }
.shop-item .muted { color: var(--text2); font-size: .9rem; }
.shop-item .btn { margin-top: 10px; align-self: flex-start; }
dialog .field { display: block; font-weight: 700; margin: 14px 0 0; }
dialog .field .hint { display: block; font-weight: 400; color: var(--text2); font-size: .88rem; margin-top: 2px; }
dialog .field input { display: block; width: 100%; margin-top: 8px; font: inherit; font-size: .95rem; }
dialog .field input[type=text], dialog .field input[type=email] { height: 40px; padding: 0 12px; border-radius: 10px; border: 1px solid var(--stroke); background: var(--bg); color: var(--text); }
#stu-prev { display: block; max-width: 100%; max-height: 240px; margin-top: 12px; border-radius: 10px; border: 1px solid var(--stroke); }
#stu-prev[hidden] { display: none; }
.adm-stu { list-style: none; margin: 16px 0 0; padding: 0; }
.adm-stu li { display: grid; grid-template-columns: minmax(180px, 1fr) 2fr; gap: 18px; padding: 16px 0; border-top: 1px solid var(--divider); }
.adm-stu li.muted { display: block; }
.adm-stu-info { display: flex; flex-direction: column; gap: 4px; overflow-wrap: anywhere; }
.adm-stu-info span, .adm-stu-info time { color: var(--text2); font-size: .9rem; }
.adm-stu-info .row { display: flex; gap: 8px; margin-top: 10px; }
.adm-stu-img { max-width: 100%; max-height: 320px; border-radius: 10px; border: 1px solid var(--stroke); cursor: zoom-in; justify-self: start; }
.adm-stu-img.zoom { max-height: none; cursor: zoom-out; }
@media (max-width: 760px) { .adm-stu li { grid-template-columns: 1fr; } }
.shop-item .bonus { color: var(--ai); font-size: .85rem; font-weight: 600; }
.adm-stu-switch.on { border: 0; background: none; } .adm-stu-switch.on b { color: var(--text); } .adm-stu-switch.on .toggle { background: var(--ai); }
.stu-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.acct-card.stu .stu-btns .btn { margin-top: 0; }
dialog .ok { color: var(--ai); font-weight: 600; font-size: .94rem; margin-top: 12px !important; }
dialog .btn[hidden] { display: none; }
.acct-note .btn { margin-left: 8px; vertical-align: middle; }

/* 공지사항 (/news). 앱 알림함과 같은 카드: 하늘색(고정·중요), 빨강(긴급), 일반은 바탕색 + 테두리 */
:root { --sky: #4BA3E3; --red-card: #E5484D; --tint-a: 13%; --tint-edge: 38%; }
@media (prefers-color-scheme: dark) { :root { --sky: #6DB9F2; --red-card: #F2777B; --tint-a: 20%; --tint-edge: 45%; } }
.news-grid { display: grid; grid-template-columns: minmax(300px, 400px) 1fr; gap: 28px; align-items: start; }
.news-list { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.news-read { position: sticky; top: 88px; max-height: calc(100vh - 112px); overflow: auto; background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 26px 32px 36px; min-width: 0; }
.news-read .pick { margin: 40px 0; text-align: center; }
.news .muted { color: var(--text2); }
.ncard { display: flex; flex-direction: column; gap: 6px; position: relative; text-decoration: none; color: var(--text); background: var(--bg); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 14px 16px; }
a.ncard:hover, details.ncard summary:hover { filter: brightness(.985); }
/* 색 카드: 그 색을 옅게 깐 바탕 + 같은 색 얇은 테두리 (유리 효과 없음, 사용자 2026-10-21) */
.ncard.lv-highlight, .ncard.lv-danger { --tint: var(--sky);
  background: color-mix(in srgb, var(--tint) var(--tint-a), var(--bg));
  border-color: color-mix(in srgb, var(--tint) var(--tint-edge), transparent); }
.ncard.lv-danger { --tint: var(--red-card); }
.ncard.doc { flex-direction: row; align-items: center; gap: 10px; }
.ncard.doc .ntext { display: flex; flex-direction: column; flex: 1; min-width: 0; }
.ncard.doc b { font-size: 1.02rem; }
.ncard.doc svg { width: 22px; height: 22px; color: var(--text3); flex: none; }
.ncard.sel { outline: 2px solid color-mix(in srgb, var(--tint, var(--sky)) 70%, #fff); outline-offset: 1px; }
.ncard .nmeta { display: flex; align-items: center; gap: 6px; font-size: .78rem; color: var(--text3); }
.ncard .nmeta time { margin-left: auto; }
.nchip { background: color-mix(in srgb, var(--soft) 80%, transparent); color: var(--text2); border-radius: 8px; padding: 1px 7px; font-weight: 600; }
.nchip.pin { color: var(--text); }
.ncard .ntitle { font-size: 1.02rem; line-height: 1.4; }
.ncard .nsub { color: var(--text2); font-size: .92rem; line-height: 1.5; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.ncard .nmore { color: var(--text2); font-size: .86rem; font-weight: 600; }
details.ncard summary { list-style: none; cursor: pointer; display: flex; flex-direction: column; gap: 6px; }
details.ncard summary::-webkit-details-marker { display: none; }
details.ncard[open] summary .nsub { display: none; }
.nbody { font-size: 1rem; line-height: 1.75; }
.nbody p { margin: 0 0 12px; }
.nbody h3 { font-size: 1.08rem; font-weight: 700; margin: 20px 0 8px; }
.nbody ul { margin: 0 0 12px; padding-left: 1.3em; }
.nbody li { margin: 2px 0; }
.nbody a { color: var(--text); text-underline-offset: 3px; }
.news-table { overflow-x: auto; margin: 4px 0 14px; }
.news-table table { border-collapse: collapse; font-size: .88rem; white-space: nowrap; }
.news-table th, .news-table td { border-bottom: 1px solid var(--divider); padding: 6px 10px; text-align: left; }
.news-table th { background: var(--soft); font-weight: 600; }
.nread-head { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.nread-head h1 { flex: 1; font-size: 1.5rem; font-weight: 800; min-width: 0; }
.nread-head .nback { display: none; }
.news-read article { padding: 4px 0 22px; }
.news-read article + article { border-top: 1px solid var(--divider); padding-top: 22px; }
.news-read article h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 4px; }
.news-read article time { display: block; color: var(--text3); font-size: .84rem; margin-bottom: 12px; }
@media (max-width: 899px) {
  .news-grid { grid-template-columns: 1fr; }
  .news-read { display: none; position: static; max-height: none; padding: 20px 20px 28px; }
  .news-grid.reading .news-list { display: none; }
  .news-grid.reading .news-read { display: block; }
  .news-grid.reading ~ * { display: none; }
  .nread-head { flex-wrap: wrap; }
  .nread-head .nback { display: inline-flex; }
  .nread-head h1 { flex-basis: 100%; order: 3; font-size: 1.3rem; }
  .nread-head #ncopy { margin-left: auto; }
}

/* 웹 결제 혜택 팝업 (내 계정, 무료 사용자) */
dialog.promo { max-width: 440px; padding: 0; overflow: hidden; }
.promo-top { background: var(--ai); color: var(--ai-on); padding: 22px 28px 20px; display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; }
.promo-badge { font-size: .82rem; font-weight: 700; background: rgba(255,255,255,.18); border-radius: 999px; padding: 4px 12px; }
.promo-pct { font-size: 3rem; font-weight: 800; letter-spacing: -0.04em; line-height: 1; }
dialog.promo h2 { margin: 24px 28px 8px; font-size: 1.4rem; line-height: 1.35; }
dialog.promo > p { margin-left: 28px; margin-right: 28px; }
.promo-ex { margin: 16px 28px 4px; background: var(--soft); border-radius: 14px; padding: 14px 18px; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.promo-name { font-weight: 700; }
.promo-cmp { display: flex; align-items: center; gap: 12px; }
.promo-cmp > span, .promo-cmp > b { display: flex; flex-direction: column; align-items: center; line-height: 1.2; }
.promo-cmp small { font-size: .74rem; font-weight: 600; color: var(--text3); }
.promo-cmp > span { color: var(--text3); }
.promo-cmp s { text-decoration-thickness: 1px; }
.promo-cmp > b { color: var(--ai); font-size: 1.25rem; }
.promo-cmp > b small { color: var(--ai); }
.promo-arrow { color: var(--text3); }
dialog.promo .promo-fine { font-size: .8rem; color: var(--text3); margin-top: 14px; }
dialog.promo .row { margin: 18px 28px 24px; }

/* 강의 자료 그림 오른쪽: AI 요약 노트 한 토막 (2026-10-21, 자료는 노트에만 씀) */
.mnote h3.ai { display: flex; align-items: center; gap: 6px; margin-top: 0; }
.mnote h3 svg { width: 16px; height: 16px; }
.mnote > b { display: block; font-size: 1.02rem; margin-bottom: 8px; }
.mnote ul { margin: 0; padding-left: 1.1em; line-height: 1.75; }
.mnote li + li { margin-top: 6px; }

/* 내 계정 로그인 버튼 (Google, Apple). Apple 버튼은 애플 지침대로 검정 바탕 (어두운 화면은 흰 바탕) */
.signin-btns { display: flex; flex-direction: column; gap: 12px; width: min(300px, 100%); margin: 0 auto; }
.signin-btns .btn { width: 100%; }
.btn-google { background: var(--surface); color: var(--text); border: 1px solid var(--stroke); }
.btn-google:hover { background: var(--soft); }
.btn-apple { background: #000; color: #fff; }
.btn-apple:hover { opacity: .88; }
.btn-apple svg { width: 18px; height: 18px; margin-top: -2px; }
@media (prefers-color-scheme: dark) { .btn-apple { background: #fff; color: #000; } }