@charset "UTF-8";
@font-face{font-family:Geist;src:url("fonts/Geist-Variable.woff2") format("woff2");font-style:normal;font-weight:100 900;font-display:swap}
:root{--ink:#172e29;--muted:#53665e;--line:#d9e2dc;--soft:#f0f5f1;--accent:#d4ef95;--screen:#19192d;font-family:Geist,"Apple SD Gothic Neo","Noto Sans KR",system-ui,sans-serif;color:var(--ink);background:#fff;line-height:1.7;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:4px}button{font:inherit;cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.4}button,a,summary{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #298263;outline-offset:4px}[hidden]{display:none!important}p{margin:0}h1,h2,h3{margin:0;line-height:1.35;letter-spacing:-.04em;word-break:keep-all}p,li{word-break:keep-all;overflow-wrap:anywhere}h2{font-size:1.65rem}h3{font-size:1.2rem}img,video{display:block;max-width:100%;height:auto}button,summary{min-height:44px}.skip-link{position:fixed;top:-80px;left:16px;background:var(--ink);color:white;padding:12px;z-index:20}.skip-link:focus{top:16px}
.site-header{max-width:1248px;margin:auto;padding:20px 36px;display:flex;align-items:center;gap:22px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:8px;flex-shrink:0}.brand-wordmark{width:108px;height:auto}.header-name{font-size:.875rem;border-left:1px solid var(--line);padding-left:22px}.site-header nav{margin-left:auto;display:flex;gap:24px;font-size:.875rem;font-weight:600}.site-header nav a{padding:8px 0}main{max-width:1248px;margin:auto;padding:0 36px}.page-heading{padding:42px 0 28px}.eyebrow{font-size:.875rem;letter-spacing:.08em;font-weight:650;color:var(--muted);margin-bottom:10px}.page-heading h1{font-size:clamp(2rem,4vw,3rem);margin-bottom:12px}.page-heading>p:last-child{color:var(--muted);font-size:1rem}.mobile-break{display:none}
.trainer{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--soft)}.trainer-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 24px;border-bottom:1px solid var(--line);background:white}.trainer-bar h2{font-size:1.1rem;letter-spacing:-.02em}.mode-switch{display:flex;padding:3px;background:var(--soft);border-radius:8px}.mode-switch button{border:0;background:none;border-radius:6px;padding:7px 16px;font-size:.875rem;font-weight:600}.mode-switch button[aria-pressed=true]{background:var(--ink);color:#fff}.trainer-layout{display:grid;grid-template-columns:minmax(0,800fr) minmax(265px,350fr)}.stage-column{min-width:0;padding:24px;border-right:1px solid var(--line)}.sim-screen,#video-stage{border-radius:8px;overflow:hidden;aspect-ratio:5/3;min-height:270px;background:var(--screen);box-shadow:0 4px 18px #10221d12}.sim-screen{position:relative;min-height:270px;color:white;isolation:isolate;user-select:none;--liquid:#1976d2}#demo-video{width:100%;height:100%;object-fit:contain}.sim-liquid{position:absolute;bottom:0;width:100%;height:16.67%;background:var(--liquid);pointer-events:none;transition:height .1s linear;z-index:-1}.sim-liquid svg{position:absolute;bottom:calc(100% - 2px);left:-50%;width:200%;height:30px;fill:var(--liquid);animation:wave 4s linear infinite}.sim-face{position:absolute;inset:0;display:flex;align-items:center;flex-direction:column;pointer-events:none}.sim-status{position:absolute;top:13%;font-size:clamp(1rem,2vw,1.35rem)}.sim-value{position:absolute;top:29%;display:flex;align-items:baseline;gap:12px;line-height:1;font-variant-numeric:tabular-nums}#sim-number{font-size:clamp(4.1rem,9vw,7.5rem);font-weight:400;letter-spacing:-.045em}#sim-unit{font-size:clamp(1.75rem,4vw,3rem);color:#c5c5cf}.sim-detail{position:absolute;top:61%;font-size:clamp(1rem,2vw,1.35rem)}.sim-hint{position:absolute;bottom:7%;font-size:clamp(.875rem,1.6vw,1.125rem);color:#e0e0eb}.sim-tap{position:absolute;inset:0;width:100%;height:100%;border:0;background:none;touch-action:none}.sim-tap:focus-visible{outline:3px solid var(--accent);outline-offset:-6px}.sim-actions{position:absolute;bottom:7%;left:5%;right:5%;display:grid;grid-template-columns:1.8fr 1fr;gap:16px}.sim-actions button{border:1px solid #92929e;border-radius:8px;background:transparent;color:white;min-height:56px;font-size:1.125rem}.sim-actions button:first-child{background:#4caf50;border-color:#4caf50}.sim-screen[data-phase=paused]{--liquid:#ffc107}.sim-screen[data-phase=paused] .sim-status{color:#ffc107}.sim-screen[data-phase=paused] #sim-primary{background:#ffc107;border-color:#ffc107;color:#171725}.sim-screen[data-phase=paused] #sim-secondary{border-color:#ff6565;color:#ff8585}.sim-screen:is([data-phase=complete],[data-phase=waiting]){--liquid:#4caf50}.sim-screen[data-phase=stopped]{--liquid:#d34343}.sim-screen:is([data-phase=complete],[data-phase=stopped]) .sim-detail{font-size:1.65rem;font-weight:600}.stage-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px;margin-top:8px;color:var(--muted);font-size:.875rem}.text-button{background:none;border:0;padding:6px 0;font-size:.875rem;font-weight:600}.trainer-help{padding:30px 28px;display:flex;flex-direction:column;align-items:flex-start}.lesson-label{font-size:.875rem;font-weight:650;border-bottom:2px solid #80a966;padding-bottom:7px;margin-bottom:20px}.lesson-copy h3{font-size:1.4rem;margin-bottom:12px}.lesson-copy p{color:var(--muted)}.amount-controls{width:100%;margin-top:22px}.amount-controls>span{font-size:.875rem;font-weight:600}.stepper{display:flex;align-items:center;justify-content:space-between;border:1px solid #b9cabe;background:white;border-radius:8px;padding:4px;margin:8px 0}.stepper button{width:44px;background:var(--soft);border:0;border-radius:5px;font-size:1.5rem}.stepper output{font-weight:700;font-variant-numeric:tabular-nums}.amount-controls>p{font-size:.875rem;color:var(--muted)}.practice-note{font-size:.875rem;color:var(--muted);border-top:1px solid var(--line);padding-top:20px;margin-top:auto;padding-bottom:4px}.amount-controls+.practice-note{margin-top:24px}.no-script{padding:12px 24px}
.prepare-note{display:grid;grid-template-columns:100px minmax(0,1fr) auto;gap:28px;align-items:center;margin:28px 0 64px;padding:26px 0;border-block:1px solid var(--line)}.prepare-label{font-size:.875rem;font-weight:700}.prepare-note h2{font-size:1.1rem;margin-bottom:5px}.prepare-note p{font-size:.94rem;color:var(--muted)}.prepare-emphasis{padding-left:28px;border-left:1px solid var(--line)}.prepare-emphasis strong{color:var(--ink)}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:25px}.section-heading>p{font-size:.875rem;color:var(--muted)}.screen-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:36px 28px}.screen-card{min-width:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;scroll-margin-top:25px}.screen-image{display:block;cursor:zoom-in;background:var(--screen);overflow:hidden}.screen-image img{width:100%;aspect-ratio:5/3;object-fit:contain}.screen-image:focus-visible{outline-offset:-5px;outline-color:var(--accent)}.card-copy{display:grid;grid-template-columns:32px 1fr;gap:14px;padding:23px 24px 26px}.step-number{font-size:.875rem;color:var(--muted);font-variant-numeric:tabular-nums;padding-top:3px}.card-copy h3{margin-bottom:12px}.card-copy p{font-size:1rem}.card-copy .card-note{font-size:.875rem;color:var(--muted);margin-top:10px}.stop-card{border-color:#b5b59b;background:#fafbf4}.stop-card .card-note{color:#705b28}.faq{display:grid;grid-template-columns:1fr 2fr;gap:40px;margin:72px 0}.faq h2{font-size:1.4rem;padding-top:18px}details{border-bottom:1px solid var(--line)}summary{padding:18px 32px 18px 0;cursor:pointer;font-weight:600;position:relative;list-style:none}summary::-webkit-details-marker{display:none}summary:after{content:"+";position:absolute;right:8px;font-size:1.25rem;font-weight:400}details[open]>summary:after{content:"−"}details p{color:var(--muted);padding:0 30px 22px 0}.site-footer{max-width:1248px;margin:auto;padding:24px 36px;border-top:1px solid var(--line);display:flex;gap:20px;align-items:center;flex-wrap:wrap;font-size:.875rem;color:var(--muted)}.footer-wordmark{display:block;width:72px;height:auto}.footer-contact{margin:auto}.footer-contact img{display:block;width:146px;height:auto}.site-footer a{margin-left:auto;color:var(--ink)}
@keyframes wave{to{transform:translateX(25%)}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
@media(max-width:1000px){.trainer-layout{grid-template-columns:minmax(0,1fr) 270px}.trainer-help{padding:24px 20px}.stage-column{padding:18px}.lesson-copy h3{font-size:1.2rem}.prepare-note{grid-template-columns:90px 1fr}.prepare-emphasis{grid-column:2;padding-left:0;border-left:0}.prepare-note{gap:12px 20px}.prepare-emphasis br{display:none}}
@media(max-width:760px){main{padding:0 20px}.site-header{padding:18px 20px;gap:14px;flex-wrap:wrap}.header-name{font-size:.875rem;padding-left:14px}.site-header nav{gap:14px}.site-header nav a:first-child{display:none}.page-heading{padding:30px 0 24px}.page-heading h1{font-size:2rem}.mobile-break{display:block}.trainer-bar{padding:16px;align-items:flex-start;flex-direction:column;gap:12px}.mode-switch{width:100%}.mode-switch button{flex:1}.trainer-layout{display:flex;flex-direction:column}.stage-column{padding:14px 14px 0;border:0}.trainer-help{padding:16px 20px 22px;display:grid;grid-template-columns:1fr;gap:0}.lesson-label{margin:0 0 12px;justify-self:start}.lesson-copy h3{font-size:1.2rem;margin-bottom:7px}.lesson-copy p{font-size:1rem}.amount-controls{margin-top:14px;max-width:340px}.practice-note,.amount-controls+.practice-note{margin-top:18px;padding-top:14px}.practice-note br{display:none}.sim-screen,#video-stage{min-height:250px}.sim-actions{gap:10px;bottom:8%}.sim-actions button{min-height:48px;font-size:1rem}.sim-value{top:28%}#sim-number{font-size:4.5rem}#sim-unit{font-size:1.75rem}.sim-status{top:11%;font-size:1rem}.sim-detail{top:59%;font-size:1rem}.sim-hint{font-size:.875rem;bottom:7%}.sim-screen:is([data-phase=confirm],[data-phase=paused]) .sim-detail{top:57%}.sim-screen:is([data-phase=complete],[data-phase=stopped]) .sim-detail{font-size:1.5rem}.stage-footer{font-size:.875rem}.prepare-note{grid-template-columns:1fr;margin:24px 0 42px;padding:22px 0;gap:8px}.prepare-emphasis{grid-column:auto;margin-top:6px}.section-heading{display:block;margin-bottom:20px}.section-heading h2{font-size:1.6rem}.section-heading>p{margin-top:10px}.screen-grid{grid-template-columns:1fr;gap:24px}.card-copy{padding:20px;grid-template-columns:28px 1fr;gap:10px}.card-copy h3{font-size:1.15rem}.faq{display:block;margin:44px 0}.faq h2{margin-bottom:10px}.site-footer{padding:22px 20px;gap:10px}.footer-contact{order:3;flex-basis:100%;margin:0}.site-footer a{align-self:start}}
@media(max-width:380px){.header-name{font-size:.8rem}.site-header nav{font-size:.8rem}.sim-screen,#video-stage{min-height:240px}.sim-actions button{font-size:.94rem}.stage-footer{flex-wrap:wrap}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.sim-liquid svg{animation:none}.sim-liquid{transition:none}}
@media print{.site-header,.trainer,.site-footer a,.skip-link{display:none}main,.site-footer{padding:0;max-width:none}.page-heading{padding-top:0}.prepare-note{margin-bottom:24px}.screen-grid{display:block}.screen-card{break-inside:avoid;margin-bottom:24px}.screen-image{max-width:500px}.faq{margin:24px 0}details>*{display:block!important}h2,h3{break-after:avoid}}