/* =========================================================
   mathloop · site stylesheet
   CI tokens: Loop Orange #FF6B00 · Ink #111827 · Orange Tint #FF951C
   Orange stays within ~5–10% of any screen (CI usage note).
   ========================================================= */

:root{
  --ink:#111827;
  --ink-2:#384152;
  --muted:#5E6676;
  --line:#E4E7EC;
  --line-2:#CFD4DC;
  --paper:#FFFFFF;
  --ground:#F4F5F7;
  --grid:rgba(17,24,39,.055);
  --orange:#FF6B00;
  --orange-hover:#EE6300;
  --orange-2:#FF951C;
  --orange-ink:#C85200;
  --tint:#FFF3E8;
  --ok:#0E9F5E;
  --ok-ink:#0B7A4B;
  --ok-bg:#E7F7EF;
  --bad:#E03E45;
  --bad-bg:#FDEDEE;
  --warn-bg:#FFF6DF;
  --warn-ink:#7A4E00;
  --ink-soft:#1C2433;
  --ink-line:#2E3749;
  --ink-text:#BEC4CF;
  --display:"Black Han Sans","IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --sans:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --wrap:1200px;
  --r:14px;
  --shadow:0 1px 2px rgba(17,24,39,.06),0 16px 36px -20px rgba(17,24,39,.30);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.7;
  word-break:keep-all;
  overflow-wrap:break-word;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block}
a{color:inherit}
p{margin:0}
h1,h2,h3,h4{margin:0;text-wrap:balance}
ul,ol{margin:0}
button{font:inherit}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:4px}
[hidden]{display:none!important}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:-9999px;top:12px;z-index:100;background:var(--ink);color:#fff;padding:10px 14px;border-radius:8px;text-decoration:none}
.skip:focus{left:16px}

/* ---------- type ---------- */
.h1{font-family:var(--display);font-weight:400;font-size:clamp(40px,5.6vw,68px);line-height:1.14;letter-spacing:-.015em}
.h1 em,.h2 em{font-style:normal;color:var(--orange)}
.h2{font-family:var(--display);font-weight:400;font-size:clamp(29px,3.5vw,44px);line-height:1.24;letter-spacing:-.01em}
.h3{font-size:20px;font-weight:700;line-height:1.45;letter-spacing:-.01em}
.lead{font-size:clamp(17px,1.5vw,19px);color:var(--ink-2);line-height:1.78;max-width:38em}
.eyebrow{font-size:14px;font-weight:700;letter-spacing:.02em;color:var(--orange-ink)}
.muted{color:var(--muted)}
.small{font-size:14px}
.mono{font-family:var(--mono)}
.num{font-variant-numeric:tabular-nums}

/* ---------- buttons & links ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 22px;border-radius:10px;
  font:700 15.5px/1 var(--sans);letter-spacing:-.005em;
  text-decoration:none;border:1.5px solid transparent;cursor:pointer;white-space:nowrap;
  transition:background-color .15s,border-color .15s,color .15s,transform .15s;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:var(--orange-hover)}
.btn-ghost{background:var(--paper);border-color:var(--line-2);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}
.btn-outline-light{background:transparent;border-color:#4A5366;color:#fff}
.btn-outline-light:hover{border-color:#fff}
.btn-sm{height:40px;padding:0 16px;font-size:14.5px;border-radius:9px}
.btn-lg{height:56px;padding:0 28px;font-size:16.5px;border-radius:12px}
.btn[disabled]{opacity:.55;cursor:progress}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;justify-self:start;
  font-weight:700;text-decoration:none;color:var(--ink);
  border-bottom:2px solid var(--orange);padding-bottom:2px;line-height:1.3;
}
.link-arrow:hover{color:var(--orange-ink)}
.link-arrow.light{color:#fff}
.link-arrow.light:hover{color:var(--orange-2)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.94);
  -webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;flex:none}
.brand img{height:24px;width:auto}
.gnb{display:flex;gap:2px}
.gnb a{padding:8px 12px;border-radius:8px;text-decoration:none;font-size:15px;font-weight:500;color:var(--ink-2)}
.gnb a:hover{background:var(--ground);color:var(--ink)}
.gnb a[aria-current="page"]{color:var(--ink);font-weight:700;background:var(--ground)}
.header-cta{margin-left:auto;display:flex;align-items:center;gap:8px}
.menu-btn{
  display:none;width:40px;height:40px;border:1.5px solid var(--line-2);border-radius:9px;background:#fff;
  align-items:center;justify-content:center;cursor:pointer;color:var(--ink);
}
.menu-btn svg{width:18px;height:18px}
.menu-btn .ic-close{display:none}
.nav-open .menu-btn .ic-open{display:none}
.nav-open .menu-btn .ic-close{display:block}
.mobile-nav{display:none;border-top:1px solid var(--line);background:#fff}
.mobile-nav .wrap{display:grid;padding-top:8px;padding-bottom:20px}
.mobile-nav a{display:block;padding:14px 0;border-bottom:1px solid var(--line);text-decoration:none;font-weight:600;font-size:16px}
.mobile-nav a[aria-current="page"]{color:var(--orange-ink)}
.mobile-nav .btn{margin-top:16px;border-bottom:1.5px solid var(--line-2)}
@media (max-width:1080px){
  .gnb,.header-cta .btn-ghost{display:none}
  .menu-btn{display:inline-flex}
  .nav-open .mobile-nav{display:block}
}

@media (max-width:560px){
  .header-inner{gap:12px}
  .brand img{height:21px}
  .header-cta .btn-sm{padding:0 12px}
}

/* ---------- sections ---------- */
.section{padding:112px 0}
.section-tight{padding:80px 0}
.section-ground{background:var(--ground)}
.section-ink{background:var(--ink);color:#fff}
.section-ink .lead{color:var(--ink-text)}
.section-ink .eyebrow{color:var(--orange-2)}
.grid-paper{
  background-color:var(--paper);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:24px 24px;background-position:-1px -1px;
}
.grid-paper-dark{
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:24px 24px;background-position:-1px -1px;
}
.section-head{display:grid;gap:16px;max-width:780px;margin-bottom:56px}
.section-head.split{max-width:none;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);align-items:end;gap:20px 72px}
.section-head.split > div{display:grid;gap:16px}
@media (max-width:900px){
  .section{padding:80px 0}
  .section-tight{padding:64px 0}
  .section-head{margin-bottom:40px}
  .section-head.split{grid-template-columns:1fr}
}

/* ---------- hero ---------- */
.hero{border-bottom:1px solid var(--line);overflow:hidden}
.hero-inner{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);gap:40px;align-items:center;padding:72px 24px 64px}
.hero-copy{display:grid;gap:24px;align-content:start}
.hero-ctas{display:flex;flex-wrap:wrap;gap:12px}
.figstrip{
  display:grid;grid-template-columns:repeat(4,minmax(0,auto));justify-content:start;gap:0 32px;
  margin-top:8px;padding-top:24px;border-top:1px solid var(--line);
}
.fig{display:grid;gap:2px}
.fig b{font-family:var(--display);font-weight:400;font-size:30px;line-height:1.15;letter-spacing:-.01em}
.fig b small{font-family:var(--sans);font-size:14px;font-weight:600;margin-left:2px;color:var(--ink-2)}
.fig span{font-size:13px;color:var(--muted);line-height:1.45}
@media (max-width:1080px){.hero-inner{grid-template-columns:1fr;padding-top:56px}}
@media (max-width:560px){.figstrip{grid-template-columns:1fr 1fr;gap:18px 20px}}

/* stage: iPad + phone composition */
.stage-wrap{display:grid;gap:16px}
.stage{position:relative;height:560px}
.ipad{
  position:absolute;left:0;top:24px;width:86%;aspect-ratio:4/3;
  background:var(--ink);border-radius:26px;padding:11px;
  box-shadow:0 40px 70px -40px rgba(17,24,39,.55);
}
.ipad .screen{height:100%;background:#fff;border-radius:16px;overflow:hidden;display:grid;grid-template-columns:104px minmax(0,1fr);font-size:11px;line-height:1.45}
.phone{
  position:absolute;right:0;bottom:0;width:250px;aspect-ratio:9/19.6;
  background:var(--ink);border-radius:38px;padding:9px;
  box-shadow:0 40px 70px -30px rgba(17,24,39,.6);
}
.phone .screen{height:100%;background:#fff;border-radius:30px;overflow:hidden;position:relative;font-size:11.5px;line-height:1.5;display:flex;flex-direction:column}
.stage-note{font-size:12.5px;color:var(--muted)}
@media (max-width:1080px){.stage{max-width:640px;width:100%;justify-self:center}}
@media (max-width:620px){
  .stage{height:auto;display:grid;justify-items:center}
  .ipad{display:none}
  .phone{position:relative;width:250px}
}

/* in-app UI atoms (mockups) */
.app-side{background:var(--ground);border-right:1px solid var(--line);padding:14px 8px;display:grid;gap:1px;align-content:start}
.app-side img{height:11px;width:auto;margin:2px 6px 14px}
.app-side span{padding:6px 8px;border-radius:6px;color:var(--ink-2);font-weight:500;white-space:nowrap}
.app-side span.on{background:var(--ink);color:#fff;font-weight:700}
.app-main{padding:14px 14px 12px;display:flex;flex-direction:column;gap:9px;min-width:0}
.app-title{display:flex;justify-content:space-between;align-items:center;gap:8px;font-weight:700;font-size:13px}
.chips{display:flex;gap:5px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border-radius:999px;border:1px solid var(--line-2);font-size:10.5px;font-weight:500;color:var(--ink-2);background:#fff;white-space:nowrap;line-height:1.4}
.chip.on{background:var(--ink);border-color:var(--ink);color:#fff}
.qlist{display:grid;gap:5px}
.qrow{display:grid;grid-template-columns:12px 20px minmax(0,1fr) auto auto;gap:8px;align-items:center;padding:6px 8px;border:1px solid var(--line);border-radius:7px;background:#fff}
.qrow .ck{width:12px;height:12px;border:1.5px solid var(--line-2);border-radius:3px;position:relative}
.qrow .ck.on{background:var(--orange);border-color:var(--orange)}
.qrow .ck.on::after{content:"";position:absolute;left:3px;top:0;width:3px;height:6px;border:solid #fff;border-width:0 1.5px 1.5px 0;transform:rotate(45deg)}
.qrow .no{font-family:var(--mono);color:var(--muted);font-size:10px}
.qrow .t{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dots{display:inline-flex;gap:2px}
.dots i{width:5px;height:5px;border-radius:1px;background:var(--line-2)}
.dots i.on{background:var(--ink)}
.vid-ic{width:14px;height:14px;border-radius:50%;background:var(--ground);position:relative}
.vid-ic::after{content:"";position:absolute;left:5px;top:4px;border-left:5px solid var(--ink);border-top:3px solid transparent;border-bottom:3px solid transparent}
.app-foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:8px;padding:8px 10px;background:var(--ground);border-radius:8px}
.mini-btn{background:var(--orange);color:#fff;border-radius:6px;padding:5px 10px;font-weight:700;font-size:10.5px;white-space:nowrap}

/* phone demo */
.ph-top{padding:26px 16px 9px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}
.ph-top b{font-size:13.5px}
.ph-top span{font-size:10.5px;color:var(--muted)}
.ph-body{padding:10px 12px 12px;display:flex;flex-direction:column;gap:8px;flex:1;min-height:0}
.toast{
  position:absolute;left:12px;right:12px;top:64px;z-index:3;
  background:var(--ink);color:#fff;border-radius:10px;padding:9px 12px;font-size:11px;font-weight:600;
  display:flex;gap:8px;align-items:center;
  opacity:0;transform:translateY(-6px);transition:opacity .3s,transform .3s;pointer-events:none;
}
.toast i{width:14px;height:14px;border-radius:4px;background:var(--orange);flex:none;position:relative}
.toast i::after{content:"";position:absolute;left:4.5px;top:2px;width:3.5px;height:7px;border:solid #fff;border-width:0 1.5px 1.5px 0;transform:rotate(45deg)}
.pq{position:relative;border:1px solid var(--line);border-radius:12px;padding:10px;display:grid;gap:7px}
.pq .meta{display:flex;justify-content:space-between;font-size:10px;color:var(--muted)}
.pq .q{font-weight:600;font-size:12px;line-height:1.55;padding-right:30px}
.pq .q .mono{font-size:11.5px}
.opts{display:grid;gap:4px;font-size:11px}
.opts span{padding:3px 8px;border-radius:6px;border:1px solid var(--line);transition:background-color .3s,border-color .3s,color .3s}
.res{font-size:10.5px;font-weight:600}
.stamp{position:absolute;right:8px;top:8px;width:40px;height:40px;fill:none;stroke-width:5;stroke-linecap:round;transition:opacity .3s,transform .3s}
.stamp-x{stroke:var(--bad)}
.stamp-o{stroke:var(--ok);opacity:0;transform:scale(.6)}
.vid-frame{
  position:relative;aspect-ratio:16/7.4;border-radius:10px;flex:none;background:var(--ink);overflow:hidden;
  display:grid;place-items:center;transition:box-shadow .3s;
}
.vid-frame svg{position:absolute;inset:0;width:100%;height:100%}
.vid-frame .play{width:26px;height:26px;border-radius:50%;background:#fff;position:relative;z-index:1}
.vid-frame .play::after{content:"";position:absolute;left:10px;top:7.5px;border-left:9px solid var(--ink);border-top:5.5px solid transparent;border-bottom:5.5px solid transparent}
.vid-frame .lab{position:absolute;left:8px;top:6px;color:#fff;font-size:9.5px;font-weight:600;opacity:.9}
.vid-frame .tm{position:absolute;right:8px;bottom:9px;color:#fff;font-family:var(--mono);font-size:9px;opacity:.8}
.vid-bar{position:absolute;left:0;right:0;bottom:0;height:3px;background:rgba(255,255,255,.2)}
.vid-bar i{display:block;height:100%;width:18%;background:var(--orange)}
.concept{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--line);border-radius:10px;font-size:10.5px;transition:background-color .3s,border-color .3s}
.concept b{display:block;font-size:10px;color:var(--orange-ink)}
.concept .c-ic{width:22px;height:22px;border-radius:6px;background:var(--ground);flex:none;position:relative}
.concept .c-ic::after{content:"";position:absolute;left:8.5px;top:6.5px;border-left:7px solid var(--ink);border-top:4.5px solid transparent;border-bottom:4.5px solid transparent}
.concept .c-t{font-family:var(--mono);font-size:9.5px;color:var(--muted);margin-left:auto}
.retry{margin-top:auto;text-align:center;padding:9px;border-radius:10px;border:1.5px solid var(--line-2);font-weight:700;font-size:11.5px;transition:background-color .3s,color .3s,border-color .3s}

/* demo states: 1 채점 → 2 오답 노트 → 3 풀이영상 → 4 개념영상 → 5 다시 풀기 */
[data-demo]:not([data-state="5"]) .o-mine{border-color:var(--bad);background:var(--bad-bg);color:var(--bad)}
[data-demo]:not([data-state="5"]) .r-right{display:none}
[data-demo][data-state="5"] .r-wrong{display:none}
[data-demo] .r-wrong{color:var(--bad)}
[data-demo] .r-right{color:var(--ok-ink)}
[data-demo][data-state="5"] .o-ans{border-color:var(--ok);background:var(--ok-bg);color:var(--ok-ink)}
[data-demo][data-state="5"] .stamp-x{opacity:0;transform:scale(.6)}
[data-demo][data-state="5"] .stamp-o{opacity:1;transform:none}
[data-demo][data-state="2"] .toast{opacity:1;transform:none}
[data-demo][data-state="3"] .vid-frame{box-shadow:0 0 0 2px var(--orange)}
[data-demo][data-state="3"] .vid-bar i{animation:play 2.6s linear forwards}
[data-demo][data-state="4"] .vid-bar i,[data-demo][data-state="5"] .vid-bar i{width:100%}
[data-demo][data-state="4"] .concept{border-color:var(--orange);background:var(--tint)}
[data-demo][data-state="5"] .retry{background:var(--ink);border-color:var(--ink);color:#fff}
@keyframes play{from{width:18%}to{width:100%}}

.demo-steps{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.demo-steps span.lbl{font-size:12.5px;color:var(--muted);margin-right:4px}
.demo-steps button{
  appearance:none;border:1px solid var(--line-2);background:#fff;border-radius:999px;
  padding:5px 12px;font-size:13px;font-weight:600;color:var(--ink-2);cursor:pointer;
}
.demo-steps button[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}

/* ---------- pains ---------- */
.pains{list-style:none;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.pains li{display:grid;gap:10px;align-content:start;padding:28px;border:1px solid var(--line);border-radius:var(--r);background:#fff}
.pains p{color:var(--ink-2)}
.xmark{width:28px;height:28px;fill:none;stroke:var(--bad);stroke-width:3.5;stroke-linecap:round}
.pains-answer{margin-top:40px;font-size:clamp(18px,2vw,22px);font-weight:600;line-height:1.6}
.pains-answer b{background:linear-gradient(transparent 62%,rgba(255,149,28,.35) 62%)}
@media (max-width:900px){.pains{grid-template-columns:1fr}}

/* ---------- loop tabs ---------- */
.loop-tabs{display:grid;grid-template-columns:repeat(5,minmax(132px,1fr));border:1px solid var(--line);border-radius:var(--r);background:#fff;overflow-x:auto}
.loop-tabs [role="tab"]{
  appearance:none;border:0;border-right:1px solid var(--line);background:none;text-align:left;
  padding:18px 20px 16px;display:grid;gap:2px;cursor:pointer;color:var(--ink);position:relative;
}
.loop-tabs [role="tab"]:last-child{border-right:0}
.loop-tabs .n{font-family:var(--mono);font-size:12px;color:var(--muted)}
.loop-tabs b{font-family:var(--display);font-weight:400;font-size:22px;line-height:1.3}
.loop-tabs small{font-size:13px;color:var(--muted)}
.loop-tabs [role="tab"]:hover{background:var(--ground)}
.loop-tabs [aria-selected="true"],.loop-tabs [aria-selected="true"]:hover{background:var(--ink);color:#fff}
.loop-tabs [aria-selected="true"] small{color:#AEB5C2}
.loop-tabs [aria-selected="true"] .n{color:var(--orange-2)}
.loop-return{margin:14px 2px 32px;font-size:14.5px;color:var(--orange-ink);font-weight:600;display:flex;gap:8px;align-items:center}
.loop-return svg{width:18px;height:18px;flex:none}
.loop-panel{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:56px;align-items:center}
.lp-visual{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;box-shadow:var(--shadow);min-height:360px;display:grid;align-content:center}
.lp-text{display:grid;gap:18px}
.lp-text p{color:var(--ink-2)}
@media (max-width:900px){.loop-panel{grid-template-columns:1fr;gap:28px}.lp-visual{min-height:0;padding:20px}}

.ticks{list-style:none;padding:0;display:grid;gap:10px}
.ticks li{position:relative;padding-left:28px}
.ticks li::before{content:"";position:absolute;left:0;top:.32em;width:18px;height:18px;border-radius:5px;background:var(--tint)}
.ticks li::after{content:"";position:absolute;left:6.5px;top:calc(.32em + 3.5px);width:5px;height:9px;border:solid var(--orange-ink);border-width:0 2px 2px 0;transform:rotate(45deg)}
.section-ink .ticks li::before{background:var(--ink-soft)}
.section-ink .ticks li::after{border-color:var(--orange-2)}

/* panel mockups */
.m-card{border:1px solid var(--line);border-radius:12px;background:#fff;padding:16px;display:grid;gap:10px;font-size:13px}
.m-head{display:flex;justify-content:space-between;align-items:center;gap:8px;font-weight:700;font-size:14px}
.m-head span{font-weight:500;font-size:12px;color:var(--muted)}
.m-card .qrow{font-size:12.5px;padding:8px 10px}
.m-card .opts{font-size:12.5px}
.m-card .opts span{padding:7px 10px}
.assign{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 12px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:10px}
.assign b{font-size:13.5px}
.assign span{font-size:12px;color:var(--muted)}
.assign .bar{grid-column:1/-1;height:6px;border-radius:3px;background:var(--ground);overflow:hidden}
.assign .bar i{display:block;height:100%;background:var(--ink)}
.photo-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:10px;border:1.5px dashed var(--line-2);border-radius:10px;font-weight:600;color:var(--ink-2)}
.ox-grid{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:6px}
.ox{aspect-ratio:1;border-radius:8px;display:grid;place-items:center;font:600 11.5px var(--mono);border:1px solid var(--line)}
.ox.o{background:var(--ok-bg);color:var(--ok-ink);border-color:#BFE6D2}
.ox.x{background:var(--bad-bg);color:var(--bad);border-color:#F5C4C7}
.score{display:flex;align-items:baseline;gap:10px}
.score b{font-family:var(--display);font-weight:400;font-size:46px;line-height:1}
.score span{color:var(--muted);font-size:13px}
.legend{display:flex;gap:14px;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px;vertical-align:-1px}
.wrong-item{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:10px}
.wrong-item .xk{width:18px;height:18px;fill:none;stroke:var(--bad);stroke-width:3;stroke-linecap:round}
.wrong-item b{display:block;font-size:13px}
.wrong-item span{font-size:12px;color:var(--muted)}
.badge{font-size:11px;font-weight:700;padding:3px 8px;border-radius:5px;background:var(--ground);color:var(--ink-2);white-space:nowrap}
.badge.pen{background:var(--tint);color:var(--orange-ink)}
.ai-box{background:var(--ground);border-radius:10px;padding:12px 14px;font-size:12.5px;display:grid;gap:4px}
.ai-box b{font-size:13px}
.video{position:relative;aspect-ratio:16/9;background:var(--ink);border-radius:12px;overflow:hidden;display:grid;place-items:center;color:#fff}
.video svg.board{position:absolute;inset:0;width:100%;height:100%}
.video .play{width:48px;height:48px;border-radius:50%;background:#fff;position:relative;z-index:1}
.video .play::after{content:"";position:absolute;left:19px;top:14px;border-left:15px solid var(--ink);border-top:10px solid transparent;border-bottom:10px solid transparent}
.video .lab{position:absolute;left:14px;top:12px;font-size:12.5px;font-weight:700;z-index:1}
.video .bar{position:absolute;left:0;right:0;bottom:0;height:4px;background:rgba(255,255,255,.2)}
.video .bar i{display:block;height:100%;width:42%;background:var(--orange)}
.board-line{stroke:#fff;stroke-opacity:.35;stroke-width:1.2;fill:none}
.board-fn{stroke:var(--orange-2);stroke-width:2.2;fill:none}
.board-txt{fill:#fff;fill-opacity:.8;font-family:var(--mono);font-size:13px}

/* ---------- DB figures (ink) ---------- */
.bigfigs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-top:1px solid var(--ink-line);border-bottom:1px solid var(--ink-line)}
.bigfig{padding:30px 20px 28px;display:grid;gap:6px;align-content:start;border-left:1px solid var(--ink-line)}
.bigfig:first-child{border-left:0;padding-left:0}
.bigfig b{font-family:var(--display);font-weight:400;font-size:clamp(40px,4.4vw,60px);line-height:1;letter-spacing:-.01em;color:#fff}
.bigfig b small{font-family:var(--sans);font-size:16px;font-weight:600;color:var(--ink-text);margin-left:4px;letter-spacing:0}
.bigfig span{font-weight:700;font-size:15px}
.bigfig em{font-style:normal;color:var(--ink-text);font-size:13.5px;line-height:1.5}
@media (max-width:980px){
  .bigfigs{grid-template-columns:1fr 1fr}
  .bigfig{border-left:0;padding-left:0;border-top:1px solid var(--ink-line)}
  .bigfig:first-child{grid-column:1/-1;border-top:0}
}
.roadmap{margin-top:44px;display:grid;gap:12px}
.roadmap-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 24px;align-items:baseline}
.roadmap-top b{font-family:var(--display);font-weight:400;font-size:clamp(22px,2.4vw,28px)}
.roadmap-top span{color:var(--ink-text)}
.roadmap-track{
  position:relative;height:16px;border-radius:8px;overflow:hidden;
  background:var(--ink-soft);border:1px solid var(--ink-line);
  background-image:repeating-linear-gradient(90deg,transparent 0 calc(10% - 1px),var(--ink-line) calc(10% - 1px) 10%);
}
.roadmap-track i{position:absolute;top:0;bottom:0;left:0;width:50%;background:var(--orange)}
.roadmap-scale{display:grid;grid-template-columns:1fr 1fr 1fr;font-family:var(--mono);font-size:12.5px;color:var(--ink-text)}
.roadmap-scale span:nth-child(2){text-align:center;color:var(--orange-2)}
.roadmap-scale span:nth-child(3){text-align:right}
.roadmap.on-light .roadmap-top span,.roadmap.on-light .roadmap-scale{color:var(--muted)}
.roadmap.on-light .roadmap-track{background-color:var(--ground);border-color:var(--line);background-image:repeating-linear-gradient(90deg,transparent 0 calc(10% - 1px),var(--line) calc(10% - 1px) 10%)}
.roadmap.on-light .roadmap-scale span:nth-child(2){color:var(--orange-ink)}
.regions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:36px}
.rg{padding:7px 15px;border-radius:999px;border:1px solid var(--ink-line);color:var(--ink-text);font-size:14px;font-weight:500}
.rg.on{background:#fff;color:var(--ink);border-color:#fff;font-weight:700}
.rg.more{border-style:dashed}
.regions .link-arrow{margin-left:12px}
.on-light .rg{border-color:var(--line-2);color:var(--muted)}
.on-light .rg.on{background:var(--ink);border-color:var(--ink);color:#fff}

/* ---------- ops compare ---------- */
.seg{display:inline-flex;background:var(--ground);border-radius:12px;padding:4px;gap:4px;margin-bottom:24px}
.seg [role="tab"]{appearance:none;border:0;background:none;font-weight:700;font-size:15px;padding:10px 24px;border-radius:9px;cursor:pointer;color:var(--muted)}
.seg [aria-selected="true"]{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(17,24,39,.14)}
.compare{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff}
.cmp-row{display:grid;grid-template-columns:170px minmax(0,1fr) minmax(0,1fr);border-top:1px solid var(--line)}
.cmp-row:first-child{border-top:0}
.cmp-row > *{padding:18px 22px}
.cmp-row .k{font-weight:700;background:var(--ground)}
.cmp-row .b{color:var(--muted)}
.cmp-row .a{font-weight:600;position:relative;padding-left:48px}
.cmp-row .a::before{content:"";position:absolute;left:22px;top:22px;width:16px;height:16px;border-radius:50%;border:2.5px solid var(--ok)}
.cmp-row.head > *{padding-top:12px;padding-bottom:12px;font-size:13px;font-weight:700;color:var(--muted);background:#fff}
.cmp-row.head .a{padding-left:22px;color:var(--ink)}
.cmp-row.head .a::before{display:none}
@media (max-width:760px){
  .cmp-row{grid-template-columns:1fr}
  .cmp-row > *{padding:10px 18px}
  .cmp-row .k{padding-top:14px}
  .cmp-row .b::before{content:"도입 전 · ";font-weight:700}
  .cmp-row .a{padding-left:44px;padding-bottom:16px}
  .cmp-row .a::before{left:18px;top:13px}
  .cmp-row.head{display:none}
  .cmp-row:nth-child(2){border-top:0}
}

/* ---------- report ---------- */
.report-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:72px;align-items:center}
.report-copy{display:grid;gap:22px;align-content:start}
@media (max-width:980px){.report-grid{grid-template-columns:1fr;gap:48px}}
.paper{
  background:#fff;border-radius:6px;padding:28px 28px 30px;display:grid;gap:22px;font-size:13px;
  box-shadow:0 2px 4px rgba(17,24,39,.06),0 36px 70px -36px rgba(17,24,39,.4);
}
.paper-head{display:flex;justify-content:space-between;align-items:center;gap:12px;border-bottom:2px solid var(--ink);padding-bottom:12px}
.paper-head .t{display:flex;align-items:center;gap:10px}
.paper-head img{height:14px;width:auto}
.paper-head b{font-size:14px}
.tag-ex{font-family:var(--mono);font-size:11px;background:var(--ground);color:var(--muted);padding:3px 8px;border-radius:4px}
.paper h4{font-size:13px;font-weight:700;margin-bottom:10px;display:flex;gap:8px;align-items:center}
.paper h4 .mono{color:var(--orange-ink);font-size:11.5px}
.score-row{display:grid;grid-template-columns:112px minmax(0,1fr);gap:22px;align-items:center}
.donut{width:112px;height:112px}
.donut circle{fill:none;stroke-width:11}
.donut .bg{stroke:var(--ground)}
.donut .fg{stroke:var(--orange);stroke-linecap:round}
.donut text{font-family:var(--display);font-size:24px;fill:var(--ink)}
.donut .sub{font-family:var(--sans);font-size:9px;fill:var(--muted)}
.kv-mini{display:grid;grid-template-columns:1fr 1fr;gap:10px 16px}
.kv-mini span{display:block;color:var(--muted);font-size:11.5px}
.kv-mini b{font-size:16px;font-variant-numeric:tabular-nums}
.units{display:grid;gap:8px}
.unit{display:grid;grid-template-columns:118px minmax(0,1fr) 38px 40px;gap:10px;align-items:center}
.unit .track{height:8px;background:var(--ground);border-radius:4px;overflow:hidden}
.unit .track i{display:block;height:100%;background:var(--ink);border-radius:4px}
.unit.low .track i{background:var(--orange)}
.unit em{font-style:normal;font-family:var(--mono);font-size:11.5px;text-align:right}
.lv{font-size:10.5px;font-weight:700;padding:2px 0;border-radius:4px;text-align:center}
.lv.good{background:var(--ok-bg);color:var(--ok-ink)}
.lv.mid{background:var(--warn-bg);color:var(--warn-ink)}
.lv.low{background:var(--bad-bg);color:var(--bad)}
.paper-split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;align-items:start}
.radar{width:100%;height:auto}
.radar .ring{fill:none;stroke:var(--line)}
.radar .axis{stroke:var(--line)}
.radar .area{fill:rgba(255,107,0,.16);stroke:var(--orange);stroke-width:1.6}
.radar .pt{fill:var(--orange)}
.radar text{font-family:var(--sans);font-size:10.5px;fill:var(--ink-2)}
.rec{display:grid;gap:6px}
.rec div{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px;align-items:start;font-size:12px;line-height:1.5}
.rec b{font-family:var(--mono);font-size:10.5px;background:var(--ink);color:#fff;padding:2px 6px;border-radius:4px}
.report-toc{list-style:none;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:10px 24px;counter-reset:r}
.report-toc li{display:flex;gap:10px;align-items:baseline;font-weight:500}
.report-toc li::before{counter-increment:r;content:counter(r,decimal-leading-zero);font-family:var(--mono);font-size:12px;color:var(--orange-ink);flex:none}
@media (max-width:520px){.report-toc{grid-template-columns:1fr}.paper-split{grid-template-columns:1fr}.unit{grid-template-columns:96px minmax(0,1fr) 34px 36px}}

/* ---------- apps ---------- */
.apps{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:32px}
.app-card{border:1px solid var(--line);border-radius:18px;padding:32px;display:grid;gap:18px;align-content:start;background:#fff}
.tag{display:inline-block;justify-self:start;font-size:13px;font-weight:700;padding:5px 10px;border-radius:6px;background:var(--ground);color:var(--ink-2)}
@media (max-width:860px){.apps{grid-template-columns:1fr}.app-card{padding:26px}}

/* ---------- pricing teaser & cards ---------- */
.price-teaser{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:56px;align-items:center}
.price-teaser > div:first-child{display:grid;gap:16px}
.pt-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px;display:grid;gap:24px}
.pt-card h3{font-size:16px}
.pt-actions{display:flex;flex-wrap:wrap;gap:16px;align-items:center}
@media (max-width:900px){.price-teaser{grid-template-columns:1fr;gap:32px}}
.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.price-card{border:1px solid var(--line);border-radius:18px;padding:28px;display:grid;gap:14px;align-content:start;background:#fff}
.price-card.featured{border-color:var(--ink);box-shadow:var(--shadow)}
.price-card .pc-name{font-weight:700;font-size:18px}
.price-card .pc-range{font-size:14px;color:var(--muted)}
.price-card .pc-amount{font-family:var(--display);font-weight:400;font-size:38px;line-height:1.1}
.price-card .pc-amount small{font-family:var(--sans);font-size:14px;font-weight:600;color:var(--muted);margin-left:4px}
.price-card .pc-note{font-size:13.5px;color:var(--muted)}
.price-card .btn{margin-top:6px}
.price-soon{border:1px dashed var(--line-2);border-radius:18px;padding:36px;display:grid;gap:18px;background:#fff}
.price-soon .h3{font-size:22px}
.tier-hint{display:flex;flex-wrap:wrap;gap:8px}
.tier-hint span{padding:8px 14px;border-radius:10px;background:var(--ground);font-weight:600;font-size:14px;color:var(--ink-2)}

/* ---------- steps & faq ---------- */
.steps{list-style:none;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0 24px}
.steps li{padding:22px 0 0;border-top:2px solid var(--ink);display:grid;gap:6px;align-content:start}
.steps .n{font-family:var(--mono);font-size:12.5px;color:var(--orange-ink);font-weight:500}
.steps b{font-size:18px;line-height:1.4}
.steps p{font-size:14.5px;color:var(--ink-2)}
@media (max-width:900px){.steps{grid-template-columns:1fr 1fr;gap:28px 24px}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}
.faq-grid{display:grid;grid-template-columns:minmax(0,.75fr) minmax(0,1.25fr);gap:64px;align-items:start}
.faq-grid > div:first-child{display:grid;gap:16px}
@media (max-width:900px){.faq-grid{grid-template-columns:1fr;gap:32px}}
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:22px 44px 22px 0;font-weight:700;font-size:17px;position:relative;line-height:1.5}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";position:absolute;right:8px;top:50%;width:10px;height:10px;
  border-right:2px solid var(--ink);border-bottom:2px solid var(--ink);
  transform:translateY(-70%) rotate(45deg);transition:transform .2s;
}
.faq details[open] summary::after{transform:translateY(-25%) rotate(-135deg)}
.faq .a{padding:0 0 24px;color:var(--ink-2);max-width:60em;display:grid;gap:8px}

/* ---------- final CTA ---------- */
.cta-final{padding:120px 0;background-color:var(--ink);color:#fff}
.cta-final .wrap{display:grid;gap:22px;justify-items:start}
.cta-final .h2{font-size:clamp(32px,4.4vw,56px);max-width:16em}
.cta-final p{color:var(--ink-text);font-size:18px}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:12px}
@media (max-width:900px){.cta-final{padding:88px 0}}

/* ---------- footer ---------- */
.site-footer{background:#0B1120;color:var(--ink-text);padding:64px 0 40px;font-size:14px}
.footer-top{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:48px;padding-bottom:40px;border-bottom:1px solid var(--ink-line)}
.footer-brand{display:grid;gap:14px;align-content:start}
.footer-brand img{height:24px;width:auto}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-nav div{display:grid;gap:8px;align-content:start}
.footer-nav h2{font-size:13px;font-weight:700;color:#fff;margin-bottom:4px}
.footer-nav a{text-decoration:none}
.footer-nav a:hover{color:#fff}
.footer-legal{padding-top:28px;display:grid;gap:6px;font-size:13px;line-height:1.7}
.footer-legal .biz-name{color:#fff;font-weight:700;font-size:14px;margin-bottom:2px}
.footer-legal .links{margin-top:10px}
.footer-legal .links{display:flex;gap:18px}
.footer-legal .links a{text-decoration:none;color:#fff}
.footer-legal .links a:hover{text-decoration:underline}
@media (max-width:860px){.footer-top{grid-template-columns:1fr}.footer-nav{grid-template-columns:1fr 1fr}}

/* ---------- sub pages ---------- */
.page-hero{padding:88px 0 72px;border-bottom:1px solid var(--line)}
.page-hero .wrap{display:grid;gap:18px}
.page-hero .h1{font-size:clamp(34px,4.8vw,58px)}
@media (max-width:760px){.page-hero{padding:64px 0 52px}}
.two-col{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:64px;align-items:center}
.two-col.top{align-items:start}
.two-col > div{display:grid;gap:18px;align-content:start}
@media (max-width:900px){.two-col{grid-template-columns:1fr;gap:36px}}
.feature-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.feature{border:1px solid var(--line);border-radius:var(--r);padding:24px;display:grid;gap:8px;align-content:start;background:#fff}
.feature h3{font-size:17px}
.feature p{color:var(--ink-2);font-size:15px}
@media (max-width:900px){.feature-list{grid-template-columns:1fr}}
.diff{list-style:none;padding:0;display:grid;gap:0;border-top:1px solid var(--line)}
.diff li{display:grid;grid-template-columns:72px minmax(0,1fr) minmax(0,1.1fr);gap:24px;padding:32px 0;border-bottom:1px solid var(--line);align-items:start}
.diff .k{font-family:var(--display);font-size:34px;line-height:1;color:var(--orange)}
.diff h3{font-size:21px}
.diff p{color:var(--ink-2)}
@media (max-width:860px){.diff li{grid-template-columns:48px minmax(0,1fr)}.diff li p{grid-column:2}}
.src-table{width:100%;border-collapse:collapse;font-size:15px;min-width:560px}
.src-table th,.src-table td{text-align:left;padding:16px 18px;border-bottom:1px solid var(--line);vertical-align:top}
.src-table thead th{font-size:13px;color:var(--muted);font-weight:700;background:var(--ground)}
.src-table td:first-child{font-weight:700}
.yes,.no{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:14px;white-space:nowrap}
.yes{color:var(--ok-ink)}
.yes::before{content:"";width:12px;height:12px;border-radius:50%;border:2.5px solid var(--ok)}
.no{color:var(--muted)}
.no::before{content:"";width:12px;height:2.5px;background:var(--line-2)}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff}
.table-wrap .src-table tr:last-child td{border-bottom:0}
.note{background:var(--ground);border-radius:12px;padding:18px 20px;font-size:14.5px;color:var(--ink-2)}
.note b{color:var(--ink)}
.rp-list{display:grid;border-top:1px solid var(--line)}
.rp-item{display:grid;grid-template-columns:64px minmax(0,.8fr) minmax(0,1.2fr);gap:24px;padding:36px 0;border-bottom:1px solid var(--line);align-items:start}
.rp-item .n{font-family:var(--mono);font-size:14px;color:var(--orange-ink);padding-top:4px}
.rp-item h3{font-size:20px}
.rp-item p{color:var(--ink-2)}
@media (max-width:860px){.rp-item{grid-template-columns:44px minmax(0,1fr)}.rp-item > div:last-child{grid-column:2}}
.trial-flow{list-style:none;padding:0;display:grid;border:1px solid var(--line);border-radius:var(--r);background:#fff;overflow:hidden}
.trial-flow li{display:grid;grid-template-columns:56px minmax(0,.9fr) minmax(0,1.3fr);gap:18px;padding:20px 24px;border-top:1px solid var(--line);align-items:start}
.trial-flow li:first-child{border-top:0}
.trial-flow .n{font-family:var(--mono);color:var(--orange-ink);font-size:13px;padding-top:2px}
.trial-flow b{font-size:16px}
.trial-flow span{color:var(--ink-2);font-size:15px}
@media (max-width:760px){.trial-flow li{grid-template-columns:40px minmax(0,1fr)}.trial-flow span{grid-column:2}}
.empty{border:1px dashed var(--line-2);border-radius:var(--r);padding:32px;text-align:center;color:var(--muted)}

/* ---------- contact form ---------- */
.form-wrap{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:64px;align-items:start}
.form-aside{display:grid;gap:22px;position:sticky;top:100px}
@media (max-width:960px){.form-wrap{grid-template-columns:1fr;gap:40px}.form-aside{position:static}}
.form{display:grid;gap:24px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:36px}
@media (max-width:560px){.form{padding:24px 20px}}
.field{display:grid;gap:8px;border:0;margin:0;padding:0;min-width:0}
.field > label,.field > legend{font-weight:700;font-size:14.5px;padding:0}
.field > legend{margin-bottom:8px}
.req{color:var(--orange-ink);margin-left:3px}
.hint{font-size:13px;color:var(--muted)}
.input,.select,.textarea{
  font:inherit;font-size:16px;padding:12px 14px;border:1.5px solid var(--line-2);border-radius:10px;
  background:#fff;color:var(--ink);width:100%;transition:border-color .15s,box-shadow .15s;
}
.textarea{min-height:120px;resize:vertical;line-height:1.6}
.input:focus,.select:focus,.textarea:focus{outline:none;border-color:var(--ink);box-shadow:0 0 0 3px rgba(17,24,39,.08)}
.input[aria-invalid="true"],.select[aria-invalid="true"]{border-color:var(--bad)}
.choice-row{display:flex;gap:10px;flex-wrap:wrap}
.choice{position:relative}
.choice input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.choice span{display:inline-flex;align-items:center;padding:11px 18px;border:1.5px solid var(--line-2);border-radius:10px;font-weight:600;font-size:15px;background:#fff}
.choice input:checked + span{border-color:var(--ink);background:var(--ink);color:#fff}
.choice input:focus-visible + span{outline:2px solid var(--orange);outline-offset:2px}
.choice-row[aria-invalid="true"] .choice span{border-color:var(--bad)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:560px){.two{grid-template-columns:1fr}}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:14.5px;line-height:1.55}
.consent input{width:18px;height:18px;margin-top:2px;accent-color:var(--orange);flex:none}
.consent a{color:var(--ink);font-weight:600}
.consents{display:grid;gap:12px;padding:18px;border-radius:12px;background:var(--ground)}
.field-error{color:var(--bad);font-size:13px;font-weight:600}
.form-status{font-size:14.5px;font-weight:600;min-height:1.5em}
.form-status[data-kind="error"]{color:var(--bad)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.done-card{border:1px solid var(--line);border-radius:18px;padding:40px;display:grid;gap:14px;background:#fff}
.done-card:focus{outline:none}
.done-card .ok-mark{width:44px;height:44px;fill:none;stroke:var(--ok);stroke-width:4;stroke-linecap:round}

/* ---------- legal ---------- */
.prose{max-width:760px;display:grid;gap:14px}
.prose h2{font-size:21px;margin-top:28px;font-weight:700}
.prose p,.prose li{color:var(--ink-2)}
.prose ul,.prose ol{padding-left:22px;display:grid;gap:6px}
.prose table{border-collapse:collapse;width:100%;font-size:14.5px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.prose th{background:var(--ground)}
.draft-banner{background:var(--warn-bg);color:var(--warn-ink);border-radius:12px;padding:14px 18px;font-size:14.5px;font-weight:600}
.ph{background:var(--warn-bg);color:var(--warn-ink);border-radius:4px;padding:0 4px}