:root{
  --paper:#F5F3EE;
  --paper-2:#EAE7DE;
  --surface:#FFFFFF;
  --ink:#1B2230;
  --ink-2:#4B5263;
  --line:#D5D0C3;
  --line-strong:#AFA999;
  --teal:#1B5E5A;
  --teal-deep:#144A47;
  --teal-tint:#DCEAE7;
  --amber:#F0B44C;
  --amber-hover:#F5C46A;
  --danger:#B3261E;
  --serif:"Noto Serif KR","Nanum Myeongjo","Batang",serif;
  --sans:"Pretendard","Noto Sans KR","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none !important}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.7;word-break:keep-all;overflow-wrap:break-word}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
h1,h2,h3,h4{margin:0;font-weight:700}
p{margin:0}
[id]{scroll-margin-top:90px}
.container{width:min(1120px,calc(100% - 40px));margin-inline:auto}

/* ---------- Site header (global) ---------- */
.site-header{position:sticky;top:0;z-index:20;background:rgba(245,243,238,.95);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.site-header__inner{display:flex;align-items:center;gap:28px;min-height:70px}
.brand{font-family:var(--serif);font-weight:700;font-size:21px;text-decoration:none;white-space:nowrap;letter-spacing:-.01em}
.brand span{font-family:var(--sans);font-size:13px;font-weight:700;color:var(--teal);margin-left:6px;letter-spacing:0}
.site-nav{display:flex;gap:24px;margin-left:auto}
.site-nav a{text-decoration:none;font-size:15px;font-weight:600;color:var(--ink-2);padding:6px 0;border-bottom:2px solid transparent;white-space:nowrap}
.site-nav a:hover{color:var(--ink)}
.site-nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--teal)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;border:0;border-radius:10px;font-family:inherit;font-weight:700;text-decoration:none;cursor:pointer;transition:background .2s,color .2s,transform .2s,opacity .2s;white-space:nowrap;line-height:1.3}
.btn svg{width:18px;height:18px;flex:none}
.btn:focus-visible{outline:3px solid var(--amber);outline-offset:3px}
.btn:disabled{opacity:.6;cursor:not-allowed}
.btn--primary{background:var(--teal);color:#fff}
.btn--primary:hover{background:var(--teal-deep)}
.btn--ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn--ghost:hover{background:var(--ink);color:#fff}
.btn--accent{background:var(--amber);color:var(--ink)}
.btn--accent:hover{background:var(--amber-hover)}
.btn--sm{padding:10px 18px;font-size:14px}
.btn--lg{padding:14px 22px;font-size:16px}
.btn--xl{padding:19px 32px;font-size:18px;box-shadow:0 14px 28px -14px rgba(20,74,71,.8)}
.btn--xl:hover{transform:translateY(-2px)}

/* ---------- Shared type / sections ---------- */
.eyebrow{font-size:14px;font-weight:700;color:var(--teal);letter-spacing:.03em;margin-bottom:14px}
.section{padding:92px 0}
.section--tint{background:var(--paper-2)}
.section-head{margin-bottom:44px;max-width:44em}
.section-head h2{font-family:var(--serif);font-size:clamp(26px,3vw,36px);line-height:1.3;letter-spacing:-.01em;margin-bottom:14px}
.section-head p{color:var(--ink-2);font-size:17px}

/* ---------- Home: hero ---------- */
.hero{padding:76px 0 84px}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.hero h1{font-family:var(--serif);font-size:clamp(34px,4.6vw,56px);line-height:1.22;letter-spacing:-.02em;margin-bottom:24px}
.hero__lead{font-size:18px;color:var(--ink-2);max-width:34em;margin-bottom:36px}
.hero__actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.hero__note{font-size:14px;color:var(--ink-2);margin-top:18px}
.hero__media{position:relative;margin:0;aspect-ratio:5/4;border-radius:16px;overflow:hidden;background:var(--paper-2)}
.hero__media img{width:100%;height:100%;object-fit:cover}
.hero__card{position:absolute;left:20px;bottom:20px;max-width:300px;background:var(--surface);border-radius:12px;padding:18px 22px;box-shadow:0 16px 36px -18px rgba(27,34,48,.5)}
.hero__card-k{display:block;font-size:13px;font-weight:700;color:var(--teal);margin-bottom:4px}
.hero__card strong{font-family:var(--serif);font-size:18px;line-height:1.45}

/* ---------- Stair path (shared: home + curriculum) ---------- */
.stairs-labels{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:12px}
.stairs-labels span{font-size:14px;font-weight:700;color:var(--ink-2);padding-bottom:8px;border-bottom:1px solid var(--line)}
.stairs{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;align-items:end;margin:0;padding:0;list-style:none}
.stairs__step{display:flex;flex-direction:column;justify-content:space-between;gap:16px;min-height:var(--h);padding:20px 16px;background:var(--surface);border:1px solid var(--line);border-top:6px solid var(--teal);border-radius:8px 8px 0 0;color:inherit;text-align:left;font:inherit;text-decoration:none;cursor:pointer;transition:transform .2s,background .2s,color .2s}
.stairs__step--mid{border-top-color:var(--amber)}
.stairs__step:hover{transform:translateY(-4px)}
.stairs__step:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.stairs__grade{font-family:var(--serif);font-size:21px;font-weight:700;line-height:1.2}
.stairs__subj{display:block;font-size:14px;line-height:1.5}
.stairs__subj + .stairs__subj{margin-top:10px}
.stairs__subj b{display:block;font-size:12px;font-weight:700;color:var(--teal);letter-spacing:.02em}
.stairs__step[aria-pressed="true"]{background:var(--ink);color:#fff;border-color:var(--ink);border-top-color:var(--amber)}
.stairs__step[aria-pressed="true"] .stairs__subj{color:#fff}
.stairs__step[aria-pressed="true"] .stairs__subj b{color:var(--amber)}
.stairs-more{margin-top:28px;font-weight:700;color:var(--teal);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1.5px;display:inline-block}

/* ---------- Home: principles / process ---------- */
.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:44px;margin:0;padding:0;list-style:none}
.principle{border-top:2px solid var(--ink);padding-top:22px}
.principle__no{font-family:var(--serif);font-size:15px;font-weight:700;color:var(--teal);margin-bottom:10px}
.principle h3{font-size:20px;line-height:1.45;margin-bottom:12px}
.principle p{color:var(--ink-2);font-size:15px}

.process{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.process li{position:relative;padding-top:60px}
.process__no{position:absolute;top:0;left:0;width:42px;height:42px;border-radius:50%;background:var(--teal);color:#fff;display:grid;place-items:center;font-weight:700;font-size:16px}
.process li:not(:last-child)::after{content:"";position:absolute;top:20px;left:58px;right:-32px;height:2px;background:var(--line)}
.process h3{font-size:20px;margin-bottom:8px}
.process p{color:var(--ink-2);font-size:15px}

.band{background:var(--teal-deep);color:#fff;border-radius:16px;padding:52px 56px;display:flex;align-items:center;justify-content:space-between;gap:32px}
.band h2{font-family:var(--serif);font-size:clamp(24px,2.8vw,32px);line-height:1.35;margin-bottom:10px;color:#fff}
.band p{color:#D6E6E3;font-size:16px;max-width:36em}

/* ---------- Consultation (home section) ---------- */
.consult__grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:64px;align-items:start}
.consult__intro h2{font-family:var(--serif);font-size:clamp(26px,3vw,36px);line-height:1.3;letter-spacing:-.01em;margin-bottom:16px}
.consult__intro > p{color:var(--ink-2);font-size:17px}
.consult__media{margin:32px 0 0;aspect-ratio:4/3;border-radius:14px;overflow:hidden;background:var(--paper-2)}
.consult__media img{width:100%;height:100%;object-fit:cover}
.consult__req{margin-top:24px;padding-top:18px;border-top:1px solid var(--line);font-size:15px;color:var(--ink-2)}

.cf{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:40px 40px 36px;display:grid;gap:22px}
.cf-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.cf-field{display:grid;gap:8px;align-content:start;border:0;margin:0;padding:0;min-width:0}
.cf-label{font-size:15px;font-weight:700;color:var(--ink);padding:0}
.cf-tag{display:inline-block;margin-left:6px;font-size:12px;font-weight:700;color:var(--teal);letter-spacing:.02em}
.cf-tag--opt{color:var(--ink-2);font-weight:600}
.cf-input{font:inherit;font-size:16px;padding:13px 14px;border:1.5px solid var(--line-strong);border-radius:8px;background:#fff;color:var(--ink);width:100%}
textarea.cf-input{min-height:104px;resize:vertical}
.cf-input:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px var(--teal-tint)}
.cf-field.is-invalid .cf-input{border-color:var(--danger)}
.cf-error{font-size:14px;color:var(--danger);font-weight:600}
.cf-error:empty{display:none}
.cf-choice{display:flex;flex-wrap:wrap;gap:10px}
.cf-choice label{position:relative;cursor:pointer}
.cf-choice input{position:absolute;opacity:0;width:1px;height:1px;margin:0;pointer-events:none}
.cf-choice span{display:inline-block;padding:11px 20px;border:1.5px solid var(--line-strong);border-radius:999px;background:#fff;font-size:15px;font-weight:600;color:var(--ink)}
.cf-choice input:checked + span{background:var(--teal);border-color:var(--teal);color:#fff}
.cf-choice input:focus-visible + span{outline:3px solid var(--amber);outline-offset:2px}
.cf-consent{padding:16px;background:var(--paper);border-radius:10px;display:grid;gap:10px}
.cf-check{display:flex;gap:10px;align-items:flex-start;font-size:15px;line-height:1.5;cursor:pointer}
.cf-check input{width:20px;height:20px;margin-top:2px;accent-color:var(--teal);flex:none}
.cf-check a{color:var(--teal);font-weight:600}
.cf-submit{width:100%;padding:17px}
.cf-status{font-size:15px;color:var(--danger);font-weight:700;min-height:1.5em}
.cf-done{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:44px 40px;display:grid;gap:24px}
.cf-done h3{font-family:var(--serif);font-size:clamp(24px,2.6vw,30px);line-height:1.35}
.cf-done h3:focus{outline:none}
.cf-done > p{color:var(--ink-2)}
.cf-summary{margin:0;display:grid;grid-template-columns:auto 1fr;gap:12px 24px;padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.cf-summary dt{font-size:14px;font-weight:700;color:var(--ink-2)}
.cf-summary dd{margin:0;font-size:15px;font-weight:600}
.cf-done__actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- Site footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:40px 0 48px;font-size:14px;color:var(--ink-2)}
.site-footer .container{display:flex;justify-content:space-between;align-items:flex-start;gap:28px;flex-wrap:wrap}
.site-footer .brand{color:var(--ink);display:inline-block;margin-bottom:8px}
.site-footer__links{display:flex;gap:22px;flex-wrap:wrap}
.site-footer__links a{color:var(--ink-2);font-weight:600}

/* ---------- Screens ---------- */
.screen{display:block}

/* ---------- Curriculum page ---------- */
.page-head{padding:70px 0 44px}
.page-head h1{font-family:var(--serif);font-size:clamp(32px,4vw,48px);line-height:1.25;letter-spacing:-.02em;margin-bottom:20px}
.page-head__lead{font-size:18px;color:var(--ink-2);max-width:40em}
.curri{padding-bottom:40px}
.curri-guide{font-size:14px;color:var(--ink-2);margin-bottom:14px}
.detail{margin-top:36px;display:grid;grid-template-columns:.9fr 1.1fr;background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden}
.detail__media{position:relative;min-height:340px;background:var(--paper-2)}
.detail__media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.detail__body{padding:44px 44px 40px}
.detail__level{font-size:14px;font-weight:700;color:var(--teal);margin-bottom:10px}
.detail__title{font-family:var(--serif);font-size:clamp(26px,3vw,34px);line-height:1.25;margin-bottom:28px}
.subjects{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.subject{border-top:3px solid var(--teal);padding-top:18px}
.subject--ma{border-top-color:var(--amber)}
.subject__k{font-size:13px;font-weight:700;color:var(--teal);margin-bottom:6px}
.subject h3{font-size:19px;line-height:1.4;margin-bottom:12px}
.subject ul{margin:0;padding-left:18px;font-size:15px;color:var(--ink-2)}
.subject li + li{margin-top:4px}
.flow{margin:30px 0 0;padding-top:24px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:20px}
.flow dt{font-size:13px;font-weight:700;color:var(--ink);margin-bottom:6px}
.flow dd{margin:0;font-size:15px;color:var(--ink-2)}
.curri-note{font-size:14px;color:var(--ink-2);margin-top:24px}
.curri-cta{margin-top:56px}

/* ---------- Auth screen ---------- */
.auth{display:grid;grid-template-columns:.9fr 1.1fr;min-height:calc(100vh - 70px)}
.auth__intro{background:var(--paper-2);padding:88px 60px}
.auth__intro h1{font-family:var(--serif);font-size:clamp(28px,3.2vw,40px);line-height:1.3;letter-spacing:-.01em;margin-bottom:22px}
.auth__intro p{color:var(--ink-2);font-size:17px;max-width:30em}
.auth__list{list-style:none;margin:36px 0 0;padding:0;display:grid;gap:14px;font-size:15px;color:var(--ink-2)}
.auth__list li{padding-left:22px;position:relative}
.auth__list li::before{content:"";position:absolute;left:0;top:.6em;width:10px;height:2px;background:var(--teal)}
.auth__panel{padding:72px 60px;display:flex;justify-content:center;align-items:flex-start}
.auth-card{width:min(440px,100%)}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line);margin-bottom:32px}
.auth-tab{background:none;border:0;padding:14px 0 13px;font:inherit;font-size:16px;font-weight:700;color:var(--ink-2);border-bottom:3px solid transparent;margin-bottom:-1px;cursor:pointer}
.auth-tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--teal)}
.auth-tab:focus-visible{outline:3px solid var(--amber);outline-offset:-3px}
.auth-form{display:grid;gap:20px}
.auth-field{display:grid;gap:8px}
.auth-label{font-size:15px;font-weight:700;color:var(--ink)}
.auth-input{font:inherit;font-size:16px;padding:13px 14px;border:1.5px solid var(--line-strong);border-radius:8px;background:#fff;color:var(--ink);width:100%}
.auth-input:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px var(--teal-tint)}
.auth-field.is-invalid .auth-input{border-color:var(--danger)}
.auth-hint{font-size:13px;color:var(--ink-2)}
.auth-error{font-size:14px;color:var(--danger);font-weight:600;min-height:0}
.auth-error:empty{display:none}
.auth-consents{gap:12px;padding:16px;background:var(--paper);border-radius:10px}
.auth-check{display:flex;gap:10px;align-items:flex-start;font-size:15px;line-height:1.5;cursor:pointer}
.auth-check input{width:20px;height:20px;margin-top:2px;accent-color:var(--teal);flex:none}
.auth-check a{color:var(--teal);font-weight:600}
.auth-submit{width:100%;margin-top:6px;padding:16px}
.auth-status{font-size:15px;color:var(--teal);font-weight:700;min-height:1.7em}
.auth-switch{background:none;border:0;padding:0;font:inherit;font-size:15px;color:var(--ink-2);text-align:center;cursor:pointer;width:100%;margin-top:4px}
.auth-switch strong{color:var(--teal);text-decoration:underline;text-underline-offset:4px}
.auth-switch:focus-visible{outline:3px solid var(--amber);outline-offset:3px}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .hero .container{grid-template-columns:1fr;gap:40px}
  .hero__media{aspect-ratio:4/3}
  .principles{grid-template-columns:1fr;gap:32px}
  .process{grid-template-columns:1fr;gap:40px}
  .process li:not(:last-child)::after{top:62px;left:20px;right:auto;bottom:-40px;width:2px;height:auto}
  .process li{padding-top:0;padding-left:70px;min-height:72px}
  .process__no{top:0;left:0}
  .band{flex-direction:column;align-items:flex-start;padding:40px}
  .consult__grid{grid-template-columns:1fr;gap:40px}
  .consult__media{aspect-ratio:16/9}
  .detail{grid-template-columns:1fr}
  .detail__media{min-height:0;aspect-ratio:16/9}
  .auth{grid-template-columns:1fr}
  .auth__intro{padding:56px 40px}
  .auth__panel{padding:48px 40px 72px}
}
@media (max-width:900px){
  .stairs-labels{display:none}
  .stairs{grid-template-columns:1fr;gap:10px}
  .stairs__step{min-height:0 !important;display:grid;grid-template-columns:92px 1fr;gap:6px 18px;align-items:center;border-top:1px solid var(--line);border-left:6px solid var(--teal);border-radius:8px;padding:16px 18px;margin-left:calc(var(--i,0) * 14px)}
  .stairs__step--mid{border-left-color:var(--amber)}
  .stairs__step[aria-pressed="true"]{border-left-color:var(--amber)}
  .stairs__grade{grid-row:span 2;font-size:19px}
  .stairs__subj + .stairs__subj{margin-top:0}
  .stairs__subj b{display:inline-block;min-width:2.6em}
  .stairs__subj{display:block}
}
@media (max-width:760px){
  [id]{scroll-margin-top:130px}
  .site-header__inner{flex-wrap:wrap;gap:10px 16px;padding:12px 0;min-height:0}
  .site-nav{order:3;width:100%;margin-left:0;overflow-x:auto;gap:22px;padding-bottom:2px;scrollbar-width:none}
  .site-nav::-webkit-scrollbar{display:none}
  .site-header__inner > .btn{margin-left:auto}
  .section{padding:68px 0}
  .hero{padding:48px 0 60px}
  .hero__actions .btn{width:100%}
  .btn--xl{font-size:17px;padding:18px 24px}
  .band{padding:32px 26px}
  .band .btn{width:100%}
  .subjects,.flow{grid-template-columns:1fr}
  .cf{padding:28px 22px}
  .cf-row{grid-template-columns:1fr}
  .cf-done{padding:32px 22px}
  .cf-done__actions .btn{width:100%}
  .detail__body{padding:30px 24px 30px}
  .hero__card{left:12px;right:12px;bottom:12px;max-width:none}
  .auth__intro{padding:44px 22px}
  .auth__panel{padding:36px 22px 60px}
  .page-head{padding:48px 0 30px}
  .section-head{margin-bottom:30px}
  .site-footer .container{flex-direction:column}
}
@media (max-width:420px){
  .brand{font-size:19px}
  .site-nav a{font-size:14px}
}