@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=Noto+Sans+KR:wght@400;500;600;700;800;900&display=swap');
:root{color-scheme:dark;--bg:#0a0e18;--panel:#111725;--panel2:#161e2d;--border:#263044;--text:#eef1fc;--muted:#8f9bb1;--accent:#a38bfa;--blue:#6d9bf3;--green:#43d2ad;--shadow:0 18px 55px #0003}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:'DM Sans','Noto Sans KR',sans-serif;font-size:14px}button,input,textarea{font:inherit}button{cursor:pointer}a{color:inherit}.app-shell{min-height:100vh;display:flex}.sidebar{width:252px;flex:none;position:sticky;top:0;height:100vh;border-right:1px solid var(--border);background:#0d1320;padding:28px 15px 18px;display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:11px;padding:0 9px 34px}.brand-icon{width:39px;height:39px;display:grid;place-items:center;border-radius:12px;background:linear-gradient(135deg,#7360e5,#b47ef7);font-size:28px;color:white;box-shadow:0 6px 22px #8a6fff40}.brand-name{font-size:21px;font-weight:900;letter-spacing:-.8px}.brand-name span{color:var(--accent)}.brand-sub{color:#61718a;font-size:9px;letter-spacing:2px;margin-top:2px}.side-caption{font-size:10px;font-weight:800;letter-spacing:2px;color:#68758c;padding:0 18px 13px}.nav{display:grid;gap:5px}.nav-link{width:100%;text-align:left;background:transparent;border:0;color:#a4aec1;border-radius:10px;padding:13px 14px;font-weight:700;display:flex;align-items:center;gap:13px}.nav-link:hover,.nav-link.active{background:#23213f;color:#cabaff}.nav-link.active{box-shadow:inset 3px 0 #a38bfa}.nav-ico{font-size:20px;min-width:22px;text-align:center}.nav-count{margin-left:auto;font-size:11px;color:#a1aab9}.sidebar-bottom{margin-top:auto}.sidebar-tip{background:linear-gradient(145deg,#252345,#1a2232);border:1px solid #363252;border-radius:13px;padding:18px;margin:0 4px}.sidebar-tip b{font-size:13px}.sidebar-tip p{font-size:11px;color:#aab2c7;line-height:1.75;margin-bottom:0}.tip-emoji{color:#d8baff;margin-right:6px}.sidebar-foot{padding:22px 12px 0;font-size:10px;letter-spacing:1.4px;color:#57657a}.main-area{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{height:77px;flex:none;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;padding:0 39px;background:#0d1320}.top-left,.top-right{display:flex;align-items:center;gap:15px}.breadcrumb{color:#65738b;font-size:12px;letter-spacing:.7px}.breadcrumb b{color:#d8deeb}.mode-tag{font-size:11px;color:#e4c78d;background:#4e422a55;border:1px solid #675539;border-radius:100px;padding:6px 10px}.mode-tag.online{color:#5fe0b9;background:#17423555;border-color:#285946}.group-button{border:1px solid var(--border);background:#161e2b;color:#d0d6e4;border-radius:9px;padding:9px 12px;font-weight:700}.avatar{border:0;border-radius:50%;width:35px;height:35px;background:linear-gradient(135deg,#a084ed,#5d77ea);color:white;font-weight:900}.mobile-menu{display:none}.content{width:100%;max-width:1450px;margin:0 auto;padding:36px 42px 50px;flex:1}.footer{text-align:center;padding:15px 20px 28px;color:#56647a;font-size:11px}.kicker{font-size:11px;font-weight:900;letter-spacing:2.6px;color:var(--accent);text-transform:uppercase}.page-title{font-size:32px;letter-spacing:-1.1px;line-height:1.3;margin:8px 0 9px;font-weight:900}.subtitle{color:var(--muted);line-height:1.8;margin:0}.section-top{display:flex;justify-content:space-between;align-items:end;gap:15px;margin:33px 0 17px}.section-title{font-size:19px;letter-spacing:-.5px;margin:0}.section-caption{font-size:12px;color:var(--muted);margin:5px 0 0}.hero{border:1px solid #4a3f77;background:radial-gradient(ellipse at 85% 14%,#51478e66,transparent 48%),linear-gradient(110deg,#262348,#171e31);border-radius:20px;padding:33px 36px;display:flex;justify-content:space-between;min-height:238px;overflow:hidden;position:relative}.hero h1{font-size:30px;line-height:1.45;letter-spacing:-1px;margin:13px 0 11px}.hero h1 em{font-style:normal;color:#c5b4ff}.hero p{color:#b4bad2;max-width:510px;line-height:1.8;margin-bottom:20px}.hero-graphic{font-size:120px;line-height:1;align-self:center;margin-right:55px;color:#bca7ff;opacity:.83;filter:drop-shadow(0 0 30px #a087fe80);transform:rotate(-15deg)}.btn{border:1px solid transparent;background:#a38bfa;color:#15122a;border-radius:10px;font-weight:900;padding:11px 17px;display:inline-flex;align-items:center;justify-content:center;gap:7px;transition:transform .14s,opacity .14s}.btn:hover{transform:translateY(-1px)}.btn.secondary{background:#202a3b;color:#e2e5f0;border-color:#354055}.btn.ghost{background:transparent;color:#c2b1ff;border-color:#4d416f}.btn.small{padding:8px 11px;font-size:12px}.btn:disabled{opacity:.45;cursor:not-allowed}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin-top:22px}.stat,.panel,.course-card,.mission-card,.leader-row,.battle-card{background:var(--panel);border:1px solid var(--border);border-radius:15px}.stat{padding:19px 20px}.stat-label{font-size:12px;color:var(--muted);display:flex;align-items:center;justify-content:space-between}.stat-icon{font-size:22px;color:#a99aff}.stat-value{font-size:29px;font-weight:900;margin:8px 0 3px}.stat-note{font-size:11px;color:#7991ac}.columns{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,1fr);gap:19px}.panel{padding:22px}.panel-title{font-weight:900;font-size:17px;margin:0 0 4px}.panel-desc{font-size:12px;color:var(--muted);margin:0 0 19px;line-height:1.7}.levels{display:grid;gap:10px}.level-row{display:flex;align-items:center;gap:14px;background:#192131;padding:14px;border:1px solid #293549;border-radius:10px}.level-icon{border-radius:10px;padding:9px;font-size:22px;background:#21364a}.level-row b{font-size:13px}.progress-bar{height:6px;background:#2c3445;border-radius:10px;overflow:hidden;margin-top:9px}.progress-fill{height:100%;background:linear-gradient(90deg,#7766e6,#b7a1ff);border-radius:10px}.level-meta{font-size:11px;color:var(--muted);margin-left:auto;white-space:nowrap}.activity{display:grid;gap:12px}.activity-item{display:flex;gap:12px;align-items:start;padding-bottom:12px;border-bottom:1px solid #263044}.activity-item:last-child{border:0;padding-bottom:0}.activity-dot{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:#242544;color:#b2a4ff;font-size:17px;flex:none}.activity-item b{font-size:12px}.activity-item p{font-size:11px;color:var(--muted);margin:5px 0 0}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.course-card,.mission-card,.battle-card{padding:21px;display:flex;flex-direction:column;gap:12px}.card-top{display:flex;align-items:center;justify-content:space-between}.pill{display:inline-flex;gap:5px;align-items:center;border:1px solid #384359;background:#222e3e;border-radius:100px;padding:5px 9px;font-size:10px;font-weight:900;color:#b9c8db}.pill.green{background:#163f37;color:#6fe2bf;border-color:#245c4d}.pill.blue{background:#183557;color:#7db3fa;border-color:#2b4a72}.pill.purple{background:#3e2c5c;color:#d1aaff;border-color:#5e427e}.card-icon{font-size:34px;margin:4px 0}.card-title{font-size:17px;font-weight:900;line-height:1.5}.card-desc{font-size:12px;line-height:1.8;color:var(--muted);flex:1}.card-footer{display:flex;align-items:center;justify-content:space-between;margin-top:4px}.meta{color:#8493aa;font-size:11px}.tabs{display:flex;gap:7px;margin:25px 0 20px;flex-wrap:wrap}.tab{padding:10px 17px;border-radius:9px;border:1px solid #303a4b;background:#17202d;color:#aeb8c9;font-weight:800}.tab.active{background:#40346a;color:#dbcfff;border-color:#655099}.lesson-layout{display:grid;grid-template-columns:1fr 290px;gap:18px;align-items:start}.lesson-block{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:27px}.lesson-block h2{margin-top:0;font-size:22px}.lesson-block h3{margin-top:27px}.lesson-block p,.lesson-block li{line-height:1.9;color:#b6bfd0}.lesson-block li{margin:8px 0}.example-label{font-size:11px;font-weight:900;margin:12px 0 7px;color:#9cabc0}.example{padding:17px;background:#1b2637;border:1px solid #334058;border-radius:11px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere}.example.bad{border-color:#6a424c;background:#39242e}.example.good{border-color:#316555;background:#19362f}.quiz-options{display:grid;gap:9px;margin-top:15px}.quiz-btn{text-align:left;padding:13px 15px;border-radius:9px;border:1px solid #354156;background:#1d2738;color:#e5e8ef}.quiz-btn:hover{border-color:var(--accent)}.quiz-btn.correct{border-color:#4adbb0;background:#193f37}.quiz-btn.incorrect{border-color:#f07587;background:#4b2932}.lesson-side{position:sticky;top:95px}.detail-list{display:grid;gap:10px}.detail-item{display:flex;align-items:center;gap:10px;color:#aab6c9;font-size:12px}.detail-item span:first-child{color:#7bdcb8}.field{width:100%;background:#0e1623;border:1px solid #344058;border-radius:10px;color:var(--text);padding:13px 14px;outline:none}.field:focus{border-color:#ac98fa;box-shadow:0 0 0 2px #9e8af02e}.field.area{resize:vertical;min-height:170px;line-height:1.8}.field.smallarea{min-height:90px}.form-label{display:block;margin:0 0 9px;font-weight:800;font-size:12px}.form-group{margin:18px 0}.hint{font-size:11px;color:#91a0b7;line-height:1.7}.requirements{padding:0;list-style:none;display:grid;gap:11px}.requirements li{display:flex;gap:10px;line-height:1.6;font-size:12px;color:#c5cfdd}.requirements li:before{content:'✓';color:#57d4ad;font-weight:900}.leader-row{padding:14px 17px;display:flex;align-items:center;gap:12px;margin-bottom:9px}.rank-num{width:34px;text-align:center;font-size:18px;font-weight:900;color:#a9b6ca}.rank-num.top{color:#f6d68c}.user-avatar{width:39px;height:39px;border-radius:11px;background:linear-gradient(135deg,#5041a8,#9771dc);display:grid;place-items:center;font-weight:900;color:#fff}.leader-info{flex:1}.leader-info b{font-size:13px}.leader-info div{font-size:11px;color:#8391a9;margin-top:4px}.score{font-size:18px;font-weight:900;color:#e0d4ff}.callout{border:1px solid #544b7b;background:#211d3b;border-radius:12px;padding:15px 18px;color:#cfcaef;line-height:1.75;font-size:12px}.empty{text-align:center;color:#9ca8bb;padding:36px 18px;border:1px dashed #3d485a;border-radius:15px}.empty-icon{font-size:38px;margin-bottom:12px}.divider{height:1px;background:var(--border);margin:20px 0}.battle-entry{display:flex;flex-direction:column;gap:11px;background:#192232;border-radius:12px;border:1px solid #2e3c52;padding:16px;margin-top:10px}.battle-entry-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.battle-entry pre{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;line-height:1.8;font-size:12px;color:#c3cede;max-height:240px;overflow:auto;margin:0}.battle-actions{display:flex;align-items:center;justify-content:space-between;gap:10px}.modal-backdrop{position:fixed;inset:0;background:#000a;z-index:50;display:grid;place-items:center;padding:20px}.modal{width:min(470px,100%);max-height:90vh;overflow:auto;border-radius:19px;padding:26px;background:#192130;border:1px solid #49506c;box-shadow:var(--shadow)}.modal h2{margin:0 0 8px}.modal p{color:#aeb8cd;line-height:1.75;font-size:12px}.modal-actions{display:flex;gap:10px;justify-content:end;margin-top:20px}.form-error{color:#ff91a0;font-size:12px;margin-top:8px}.flex-between{display:flex;justify-content:space-between;align-items:center;gap:12px}.actions{display:flex;gap:9px;flex-wrap:wrap}.notice{border-radius:12px;padding:13px 16px;background:#222b3d;border:1px solid #3c4963;color:#c0cee2;font-size:12px;line-height:1.8}.leaderboard-header{display:grid;grid-template-columns:1fr auto;align-items:center;margin:30px 0 17px}.chip{font-size:10px;color:#8fa1b9}.copy-code{font-size:22px;letter-spacing:3px;color:#d9caff;font-weight:900}.mini-stat{display:flex;gap:13px;align-items:center}.mini-stat b{font-size:22px}.mini-stat small{color:#8795ac}.mission-form-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);gap:18px}.submission-note{background:#1b2c35;border:1px solid #31595a;border-radius:12px;padding:15px;color:#b7dedc;font-size:12px;line-height:1.75}.section-gap{margin-top:22px}#toast{position:fixed;right:22px;bottom:22px;z-index:100;background:#292d49;color:white;border:1px solid #685f98;border-radius:11px;padding:12px 17px;box-shadow:var(--shadow);opacity:0;transform:translateY(12px);transition:.2s;pointer-events:none;max-width:350px}#toast.show{opacity:1;transform:translateY(0)}
@media(max-width:1100px){.sidebar{width:215px}.content{padding:28px}.topbar{padding:0 27px}.hero-graphic{margin-right:10px}.grid-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){.sidebar{position:fixed;transform:translateX(-105%);transition:transform .2s;box-shadow:var(--shadow)}.sidebar.open{transform:translateX(0)}.mobile-menu{display:block}.icon-btn{color:#fff;background:none;border:0;font-size:22px}.topbar{height:64px;padding:0 15px}.content{padding:24px 16px 42px}.hero{padding:25px 23px;min-height:auto}.hero h1{font-size:24px}.hero-graphic{font-size:75px;margin:0;position:absolute;right:12px;bottom:25px;opacity:.23}.hero>div:first-child{z-index:1}.stats{grid-template-columns:repeat(2,1fr)}.columns,.lesson-layout,.mission-form-grid{grid-template-columns:1fr}.lesson-side{position:static}.page-title{font-size:27px}.mode-tag{display:none}.grid-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.grid-3,.grid-2{grid-template-columns:1fr}.stats{gap:9px}.stat{padding:14px}.stat-value{font-size:24px}.group-button{max-width:135px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.top-right{gap:8px}.hero h1{font-size:22px}.page-title{font-size:25px}.course-card,.mission-card{padding:18px}}

/* v0.2 usability polish */
.search-row{display:flex;align-items:center;gap:13px;margin:0 0 20px}.search-row input{max-width:460px}
.rubric-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin:12px 0 14px}.rubric-grid>div{background:#202b3c;border:1px solid #38455d;padding:12px;border-radius:10px;font-size:12px}.rubric-grid small{display:block;color:#9aaac0;margin-top:6px;line-height:1.5}
.btn.danger{background:#492a35;color:#ffb8c6;border-color:#874656;margin-left:12px}
.btn.selected-rating{background:#55428a;border-color:#b59eff;color:#fff}
button:focus-visible,a:focus-visible{outline:3px solid #dec4ff;outline-offset:3px}
@media(max-width:520px){.rubric-grid{grid-template-columns:1fr}.search-row{flex-wrap:wrap}.battle-actions{flex-wrap:wrap}.battle-actions .actions{gap:5px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

/* v0.3: 초급 강의의 사례 해설과 실습 */
.lesson-insight,.lesson-practice{margin-top:22px;padding:17px 19px;background:#202c41;border:1px solid #455673;border-radius:12px}
.lesson-insight b{color:#d6c4ff}.lesson-insight p,.lesson-practice p{margin:9px 0 0;line-height:1.85}
.lesson-practice{background:#1b3036;border-color:#35685f}.lesson-practice h3{margin:0 0 8px}.lesson-practice textarea{margin-top:13px}.lesson-practice .hint{margin-top:8px}
.quiz-feedback{margin-top:14px;padding:13px 16px;background:#233248;border:1px solid #425472;border-radius:10px;color:#e6e8fc}.quiz-feedback p{margin:6px 0 0}

/* v0.5: 게시판 창작 놀이 실험실 */
.play-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px;margin-top:18px}
.play-card{background:#171f30;border:1px solid #3c4760;border-radius:17px;padding:21px;display:flex;flex-direction:column;gap:10px;min-height:275px;transition:border-color .2s,transform .2s}
.play-card:hover{border-color:#9e83d6;transform:translateY(-2px)}
.play-symbol{font-size:34px;line-height:1.1;color:#d1bafa}
.play-card h3{font-size:17px;line-height:1.45;margin:4px 0 0}
.play-card p{font-size:12px;line-height:1.8;color:#acb9d1;margin:0;flex:1}
.play-tags{display:flex;gap:6px;flex-wrap:wrap}.play-tags span{background:#2b3450;border:1px solid #47516f;color:#d4dff7;font-size:11px;border-radius:99px;padding:4px 8px}
.play-controls{display:flex;gap:8px;flex-wrap:wrap;margin-top:7px}
@media(max-width:1100px){.play-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.play-grid{grid-template-columns:1fr}.play-card{min-height:auto}}

/* v1.0 visual prompt builder */
.builder-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;align-items:start}
.builder-form,.builder-preview{min-width:0}
.builder-form .form-group{margin:17px 0}
.builder-two{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.builder-checks{display:grid;gap:12px;margin-top:15px;color:#d3dded;font-size:12px}
.builder-checks label{display:flex;align-items:center;gap:10px;cursor:pointer}
.builder-checks input{accent-color:#a38afb;width:17px;height:17px}
.builder-output{min-height:590px!important;font-size:12px;line-height:1.75;white-space:pre-wrap}
.builder-preview{position:sticky;top:86px}
@media(max-width:1000px){.builder-grid{grid-template-columns:1fr}.builder-preview{position:static}.builder-output{min-height:340px!important}}
@media(max-width:520px){.builder-two{grid-template-columns:1fr}}