:root{--bg:#090c12;--panel:#111620;--panel2:#171d28;--line:#2a3240;--text:#f8fafc;--muted:#9da8ba;--red:#e5484d;--red2:#bf3036;--green:#20c997}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,Pretendard,Arial,sans-serif;background:var(--bg);color:var(--text)}button,input,textarea,select{font:inherit}.hidden{display:none!important}.join-view{min-height:100vh;display:grid;place-items:center;padding:28px;background:radial-gradient(circle at top,#241015 0,#090c12 42%)}.join-card{width:min(460px,100%);background:#11151f;border:1px solid #303744;border-radius:24px;padding:38px;box-shadow:0 24px 70px #0008}.brand-mark,.brand-small{display:grid;place-items:center;background:linear-gradient(145deg,#f05b60,#b51f2a);color:white;font-weight:800}.brand-mark{width:64px;height:64px;border-radius:18px;font-size:30px;margin:auto}.join-card h1{text-align:center;font-size:32px;margin:18px 0 10px}.lead{text-align:center;color:#b3bdcc;line-height:1.7}.mode-tabs{display:grid;grid-template-columns:1fr 1fr;background:#0b0f16;padding:4px;border-radius:12px;margin:24px 0 18px}.mode-tab{border:0;background:transparent;color:#9aa5b6;padding:11px;border-radius:9px;cursor:pointer}.mode-tab.active{background:#2b171b;color:#ff9599}.mode-panel{display:none}.mode-panel.active{display:block}.mode-panel h2{font-size:18px}label{display:block;font-weight:700;font-size:14px;margin:14px 0}input,select{width:100%;margin-top:8px;padding:13px 14px;border-radius:10px;border:1px solid #343d4c;background:#0d121a;color:white;outline:none}input:focus,select:focus{border-color:var(--red);box-shadow:0 0 0 3px #e5484d25}.primary{border:0;background:linear-gradient(135deg,var(--red),var(--red2));color:#fff;border-radius:10px;padding:12px 20px;font-weight:800;cursor:pointer}.wide{width:100%;margin-top:6px}.contact-card{margin-top:22px;padding-top:18px;border-top:1px solid #2c3340;display:grid;gap:5px;text-align:center;color:#9da8ba}.contact-card a,.modal a{color:#ff8589;text-decoration:none}.app-view{height:100vh;overflow:hidden}.topbar{height:70px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--line);background:#0d1119}.brand{display:flex;align-items:center;gap:10px}.brand-small{width:34px;height:34px;border-radius:9px}.room-tools{display:flex;gap:10px;align-items:center}.ghost{background:#1b2130;border:1px solid transparent;color:white;border-radius:10px;padding:11px 14px;font-weight:700;cursor:pointer}.ghost:hover{border-color:#465063}.danger{color:#ff8589}.workspace{height:calc(100vh - 70px);display:grid;grid-template-columns:minmax(0,2.15fr) minmax(330px,1fr);gap:10px;padding:10px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}.panel-titlebar{height:44px;display:flex;align-items:center;justify-content:space-between;padding:0 13px;background:var(--panel2);border-bottom:1px solid var(--line)}.dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:8px}.green{background:#2bd9a6}.editor-meta{display:flex;align-items:center;gap:12px;color:#a6afbe;font-size:12px}.editor-meta select{width:auto;margin:0;padding:5px 8px}.right-column{display:grid;grid-template-rows:160px 245px minmax(0,1fr);gap:10px;min-height:0}.code-editor{height:calc(100% - 44px);display:grid;grid-template-columns:58px minmax(0,1fr);background:#171717}.line-numbers{padding:16px 12px;text-align:right;color:#687386;background:#11151c;border-right:1px solid #2a303b;font:14px/24px Consolas,monospace;white-space:pre;overflow:hidden;user-select:none}.code-area{position:relative;overflow:hidden}.code-area pre,.code-area textarea{position:absolute;inset:0;margin:0;padding:16px 18px;border:0;resize:none;white-space:pre;overflow:auto;font:15px/24px Consolas,'Courier New',monospace;tab-size:4}.code-area pre{pointer-events:none;color:#e8edf5;background:#181818}.code-area textarea{z-index:2;background:transparent;color:transparent;caret-color:white;-webkit-text-fill-color:transparent;outline:none}.code-area textarea::selection{background:#7f303a88}.tok-keyword{color:#ff6b75;font-weight:700}.tok-string{color:#f3c969}.tok-number{color:#8bd5ca}.tok-comment{color:#6f8196}.tok-function{color:#82aaff}.member-list{padding:12px}.member{display:flex;align-items:center;gap:9px;padding:7px}.avatar{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:800}.owner{margin-left:auto;color:#ff777d;font-size:11px}.count{background:#252c3a;padding:4px 9px;border-radius:20px}.tabs{height:42px;display:flex;border-bottom:1px solid var(--line)}.tab{flex:1;border:0;background:transparent;color:#aab3c2;font-weight:700;cursor:pointer}.tab.active{color:white;border-bottom:2px solid var(--red)}.tab-content{display:none;height:calc(100% - 42px)}.tab-content.active{display:block}.output-meta{height:34px;padding:9px 12px;color:#93a0b4;font-size:12px;border-bottom:1px solid var(--line)}#output{margin:0;padding:14px;height:calc(100% - 34px);overflow:auto;white-space:pre-wrap;font:13px/1.6 Consolas,monospace}.error{color:#ff8d91}#stdinInput{width:100%;height:100%;border:0;background:#0d1118;color:white;padding:14px;resize:none}.chat-panel{display:grid;grid-template-rows:44px minmax(0,1fr) 54px}.chat-messages{overflow:auto;padding:12px}.chat-head{font-size:12px;font-weight:700}.chat-bubble{margin-top:3px;white-space:pre-wrap}.chat-form{display:grid;grid-template-columns:1fr 40px;gap:8px;padding:8px;border-top:1px solid var(--line)}.chat-form input{margin:0;padding:9px}.chat-form button{border:0;border-radius:9px;background:var(--red);color:white;font-size:20px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);opacity:0;background:#202735;border:1px solid #424c5c;padding:12px 18px;border-radius:10px;transition:.2s;z-index:30}.toast.show{opacity:1;transform:translate(-50%,0)}.modal{position:fixed;inset:0;background:#000a;display:grid;place-items:center;z-index:40}.modal-card{position:relative;width:min(360px,90%);background:#151a24;border:1px solid #3a4352;border-radius:18px;padding:28px;text-align:center}.modal-close{position:absolute;right:12px;top:8px;border:0;background:none;color:white;font-size:28px;cursor:pointer}@media(max-width:900px){.app-view{height:auto;overflow:auto}.topbar{height:auto;min-height:70px;align-items:flex-start;gap:10px;padding:12px;flex-direction:column}.room-tools{flex-wrap:wrap}.workspace{height:auto;grid-template-columns:1fr}.editor-panel{height:65vh}.right-column{grid-template-rows:180px 260px 360px}.workspace{padding:6px}.join-card{padding:26px}}

.form-error{margin-top:16px;padding:12px 14px;border:1px solid #7f1d1d;background:#2a1013;color:#fecaca;border-radius:10px;white-space:pre-wrap;line-height:1.5}.form-error.hidden{display:none}

/* Fixed8: dictionary tabs, execution mode, comment color */
.tok-comment{color:#8fd694!important;font-style:italic}.tok-preprocessor{color:#7db7d8}.tok-keyword{color:#ff5b67;font-weight:700}.tok-function{color:#6ea8ff}.tok-string{color:#ffe08a}.tok-number{color:#c6a0f6}
#createRoomForm small{display:block;margin-top:7px;color:#8f9bb3;font-size:12px;line-height:1.45}
.side-tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid #293244;background:#151c28}.side-tab{border:0;background:transparent;color:#aebbd0;padding:13px 10px;font-weight:800;cursor:pointer;border-bottom:2px solid transparent}.side-tab.active{color:#fff;border-bottom-color:#ef4650}.side-tab-content{display:none;min-height:0;height:100%}.side-tab-content.active{display:flex;flex-direction:column}.chat-panel{overflow:hidden}.chat-panel .side-tab-content{min-height:0}.dictionary-search{display:flex;gap:8px;padding:10px;border-bottom:1px solid #293244}.dictionary-search input{flex:1;min-width:0;background:#0d131d;border:1px solid #303a4d;border-radius:9px;color:#fff;padding:10px 11px}.dictionary-search button{border:0;border-radius:9px;background:#e8444d;color:#fff;font-weight:800;padding:0 14px;cursor:pointer}.dictionary-hint{padding:9px 12px;color:#9eacc2;font-size:12px;border-bottom:1px solid #242d3d}.dictionary-results{padding:10px;overflow:auto;min-height:0;display:flex;flex-direction:column;gap:10px}.dict-card{border:1px solid #2d3749;background:#111824;border-radius:11px;padding:11px}.dict-card h3{margin:0 0 7px;color:#ff6b73;font-size:15px}.dict-card p{margin:0 0 8px;color:#c7d1e1;font-size:13px;line-height:1.55}.dict-syntax{background:#0c121b;color:#9fc7ff;border-radius:7px;padding:7px 8px;font-family:Consolas,monospace;font-size:12px;margin-bottom:8px;white-space:pre-wrap}.dict-card pre{margin:0;background:#090e16;border-radius:7px;padding:9px;overflow:auto;color:#e6edf7;font:12px/1.55 Consolas,monospace;white-space:pre}.dictionary-empty{color:#9eacc2;text-align:center;padding:25px 8px}.hidden{display:none!important}
.execution-badge{display:inline-flex;align-items:center;padding:3px 7px;border:1px solid #39445a;border-radius:999px;color:#aebdd2;background:#111824;font-size:11px;white-space:nowrap}
/* Fixed9: progress, problem bank, dated chat */
.user-progress{margin-left:10px;padding:6px 10px;border:1px solid #3a4352;border-radius:999px;background:#171d28;color:#ffd6d8;font-size:12px;font-weight:800;white-space:nowrap}
.chat-head{display:flex;align-items:center;gap:8px}.chat-head time{color:#738096;font-size:10px;font-weight:400}.chat-message{margin-bottom:12px}
.editor-panel{display:flex;flex-direction:column;min-height:0}.editor-view-tabs{height:42px;display:flex;background:#111722;border-bottom:1px solid var(--line);flex:0 0 auto}.editor-view-tab{border:0;background:transparent;color:#98a5b9;padding:0 20px;font-weight:800;cursor:pointer;border-bottom:2px solid transparent}.editor-view-tab.active{color:#fff;border-bottom-color:var(--red)}.editor-view{display:none;min-height:0;flex:1}.editor-view.active{display:flex;flex-direction:column}.editor-view .code-editor{height:auto;flex:1;min-height:0}
.problem-layout{display:grid;grid-template-columns:250px minmax(0,1fr);height:100%;min-height:0}.problem-sidebar{border-right:1px solid var(--line);background:#0f141d;min-height:0;display:flex;flex-direction:column}.problem-sidebar-head{height:48px;display:flex;align-items:center;justify-content:space-between;padding:0 12px;border-bottom:1px solid var(--line)}.mini-btn{border:1px solid #414b5c;background:#1c2432;color:#fff;border-radius:7px;padding:6px 9px;cursor:pointer;font-weight:700}.mini-btn.danger{color:#ff8589}.problem-list{padding:8px;overflow:auto}.problem-item{width:100%;display:grid;grid-template-columns:28px minmax(0,1fr) 24px;align-items:center;gap:7px;text-align:left;border:1px solid transparent;background:transparent;color:#dce4ef;border-radius:8px;padding:9px 7px;cursor:pointer}.problem-item:hover,.problem-item.active{background:#1a2230;border-color:#394457}.problem-num{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:#252f40;color:#aab7ca;font-size:11px}.pass{color:#54d68c!important}.fail{color:#ff6f78!important}.problem-main{min-width:0;min-height:0;overflow:auto;padding:18px}.problem-empty,.problem-empty-small{color:#8f9bad;text-align:center;padding:45px 15px}.problem-head{display:flex;justify-content:space-between;gap:15px;align-items:flex-start}.problem-head h2{margin:5px 0 14px}.problem-status{display:inline-grid;place-items:center;width:30px;height:24px;border-radius:6px;background:#293142;font-weight:900}.problem-actions{display:flex;gap:7px}.problem-description{white-space:pre-wrap;color:#d0d8e5;line-height:1.65;margin-bottom:14px}.problem-io{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}.problem-io>div{border:1px solid #313b4c;border-radius:9px;overflow:hidden}.problem-io strong{display:block;padding:8px 10px;background:#171e2a}.problem-io pre{height:90px;margin:0;padding:10px;overflow:auto;background:#0d121a;color:#e6edf7;white-space:pre-wrap}.problem-code-wrap{height:320px;display:grid;grid-template-columns:58px minmax(0,1fr);border:1px solid #313b4c;border-radius:9px;overflow:hidden;background:#171717}.problem-code-wrap .code-area{position:relative}.problem-code-wrap pre,.problem-code-wrap textarea{position:absolute;inset:0;margin:0;padding:16px 18px;border:0;resize:none;white-space:pre;overflow:auto;font:15px/24px Consolas,monospace;tab-size:4}.problem-code-wrap pre{pointer-events:none;background:#181818}.problem-code-wrap textarea{z-index:2;background:transparent;color:transparent;caret-color:white;-webkit-text-fill-color:transparent;outline:none}.problem-submit-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:12px;color:#9ba8ba;font-size:12px}.problem-admin-form{max-width:760px}.problem-admin-form textarea{width:100%;min-height:95px;margin-top:8px;padding:12px;border:1px solid #343d4c;border-radius:9px;background:#0d121a;color:#fff;resize:vertical}.problem-form-actions{display:flex;justify-content:flex-end;gap:9px}.admin-attempt-list{margin-top:18px;border-top:1px solid var(--line);padding-top:12px}.attempt-row{display:grid;grid-template-columns:110px minmax(0,1fr) 25px 125px;gap:8px;padding:7px;border-bottom:1px solid #252e3c;font-size:12px}.attempt-row time{color:#8290a5}.problem-status.pass{background:#123523}.problem-status.fail{background:#42191d}
@media(max-width:900px){.brand{flex-wrap:wrap}.user-progress{margin-left:0}.problem-layout{grid-template-columns:1fr}.problem-sidebar{max-height:210px;border-right:0;border-bottom:1px solid var(--line)}.problem-io{grid-template-columns:1fr}.problem-submit-row{align-items:stretch;flex-direction:column}.problem-code-wrap{height:300px}}
.admin-rooms-panel{margin-top:22px;padding-top:18px;border-top:1px solid #303744}.admin-rooms-head{display:flex;align-items:center;justify-content:space-between}.admin-rooms-head h2{margin:0;font-size:18px}.mini-btn{border:1px solid #465063;background:#1b2130;color:#fff;border-radius:8px;padding:7px 10px;cursor:pointer}.admin-room-list{display:grid;gap:9px;margin-top:12px;max-height:310px;overflow:auto}.admin-room-card{border:1px solid #343d4c;background:#0d121a;border-radius:11px;padding:12px}.admin-room-info{display:flex;align-items:center;justify-content:space-between;gap:10px}.admin-room-name{font-weight:800}.admin-room-meta{font-size:12px;color:#9da8ba;margin-top:5px}.admin-room-actions{display:flex;gap:7px;margin-top:10px}.admin-room-actions button{flex:1;border:0;border-radius:8px;padding:8px;cursor:pointer;font-weight:700}.room-enter{background:#26334a;color:#fff}.room-edit{background:#3a2b18;color:#ffd08a}.room-delete{background:#3a171b;color:#ff9499}.admin-room-empty{padding:18px;text-align:center;color:#9da8ba}.edit-room-form{margin-top:14px;padding:14px;border:1px solid #414a59;border-radius:12px;background:#0b0f16}.edit-room-form h3{margin:0 0 8px}.edit-room-actions{display:flex;justify-content:flex-end;gap:8px}.edit-room-actions button{width:auto}.join-card:has(.admin-rooms-panel:not(.hidden)){width:min(620px,100%)}

/* Fixed14 progress levels */
.user-progress[data-level="입문"]{border-color:#65758b}.user-progress[data-level="초급"]{border-color:#4f9f72}.user-progress[data-level="중급"]{border-color:#d49b3f}.user-progress[data-level="고급"]{border-color:#e5484d}

/* Fixed15: student header cleanup and colored progress levels */
.app-view.student-mode .execution-badge{display:none}
.editor-meta #languageSelect{appearance:none;-webkit-appearance:none;-moz-appearance:none;background-image:none!important;padding-right:10px;cursor:default}
.user-progress{display:inline-flex;align-items:center;gap:8px;padding-right:6px}
.progress-level{display:inline-flex;align-items:center;justify-content:center;min-width:42px;padding:3px 8px;border-radius:999px;font-size:11px;line-height:1.2;color:#10141c;box-shadow:0 0 0 1px rgba(255,255,255,.12) inset,0 2px 8px rgba(0,0,0,.22)}
.user-progress[data-level="입문"]{border-color:#d9ad26;background:linear-gradient(135deg,#2b2616,#1a1d27)}
.user-progress[data-level="입문"] .progress-level{background:linear-gradient(135deg,#ffe06b,#e4ac21);color:#3a2b00}
.user-progress[data-level="초급"]{border-color:#49b879;background:linear-gradient(135deg,#14271d,#1a1d27)}
.user-progress[data-level="초급"] .progress-level{background:linear-gradient(135deg,#7ce7a6,#35ad6c);color:#062715}
.user-progress[data-level="중급"]{border-color:#4f9ee8;background:linear-gradient(135deg,#142333,#1a1d27)}
.user-progress[data-level="중급"] .progress-level{background:linear-gradient(135deg,#83c8ff,#3d8fe0);color:#06213a}
.user-progress[data-level="고급"]{border-color:#d45ce8;background:linear-gradient(135deg,#2b1831,#1a1d27);box-shadow:0 0 14px rgba(212,92,232,.16)}
.user-progress[data-level="고급"] .progress-level{background:linear-gradient(135deg,#f19cff,#b748d2);color:#31083a}


/* Fixed16: shared administrator line highlight */
.line-numbers{position:relative;padding-top:16px;padding-bottom:16px}
.line-number{display:block;height:24px;line-height:24px;padding-right:0;border-radius:4px}
.line-numbers.admin-clickable .line-number{cursor:pointer}
.line-numbers.admin-clickable .line-number:hover{background:rgba(255,220,70,.16);color:#ffe169}
.line-number.active{background:rgba(255,214,10,.28);color:#ffe45e;font-weight:800}
.shared-line-highlight{position:absolute;left:0;right:0;height:24px;background:rgba(255,214,10,.25);border-top:1px solid rgba(255,231,112,.52);border-bottom:1px solid rgba(255,231,112,.52);box-shadow:inset 3px 0 0 #ffd60a;pointer-events:none;z-index:4}
.code-area pre{z-index:0}
.code-area textarea{z-index:2}

/* Fixed17: shark mascot landing page */
.join-view{display:block;padding:34px 24px;overflow:auto;background:
 radial-gradient(circle at 78% 18%,rgba(42,91,170,.22),transparent 28%),
 radial-gradient(circle at 16% 15%,rgba(229,72,77,.18),transparent 28%),
 linear-gradient(145deg,#070b12 0%,#0a111c 54%,#080b11 100%)}
.landing-shell{width:min(1180px,100%);min-height:calc(100vh - 68px);margin:0 auto;display:grid;grid-template-columns:minmax(0,1.35fr) minmax(390px,.65fr);gap:28px;align-items:center}
.landing-hero{position:relative;min-height:680px;border:1px solid rgba(79,99,132,.32);border-radius:30px;overflow:hidden;background:linear-gradient(145deg,rgba(16,25,40,.96),rgba(8,13,23,.98));box-shadow:0 32px 90px rgba(0,0,0,.42)}
.landing-hero:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 68% 35%,rgba(47,111,204,.23),transparent 38%),linear-gradient(120deg,rgba(229,72,77,.08),transparent 38%);pointer-events:none}
.landing-brand{position:relative;z-index:1;height:100%;display:flex;flex-direction:column;justify-content:flex-end;padding:40px}
.landing-mascot{position:absolute;right:-25px;top:-6px;width:min(610px,78%);filter:drop-shadow(0 26px 36px rgba(0,0,0,.45));object-fit:contain}
.landing-copy{position:relative;z-index:2;max-width:600px;padding:28px 30px;border:1px solid rgba(83,101,132,.32);border-radius:24px;background:linear-gradient(135deg,rgba(8,14,24,.92),rgba(14,22,35,.76));backdrop-filter:blur(10px);box-shadow:0 18px 42px rgba(0,0,0,.28)}
.landing-eyebrow{display:inline-flex;color:#ff7479;font-weight:900;letter-spacing:.16em;font-size:12px;margin-bottom:12px}
.landing-copy h1{font-size:clamp(36px,4.8vw,68px);line-height:1.02;margin:0 0 16px;letter-spacing:-.05em}
.landing-copy h1 span{background:linear-gradient(135deg,#ff555b,#ff8b5c);-webkit-background-clip:text;background-clip:text;color:transparent}
.landing-copy p{font-size:18px;line-height:1.65;color:#c5cfdd;margin:0}
.landing-feature-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.landing-feature-row span{padding:8px 11px;border:1px solid #344158;border-radius:999px;background:#121b2a;color:#b8c7dc;font-size:12px;font-weight:800}
.join-card{width:100%;max-height:calc(100vh - 70px);overflow:auto;padding:30px;background:linear-gradient(155deg,rgba(17,23,35,.98),rgba(11,16,25,.98));border-color:#344158;box-shadow:0 28px 80px rgba(0,0,0,.42)}
.join-card-title{display:flex;align-items:center;gap:13px;margin-bottom:16px}.join-card-title .brand-mark{width:50px;height:50px;border-radius:15px;margin:0;font-size:22px}.join-card-title strong{display:block;font-size:21px}.join-card-title small{display:block;margin-top:4px;color:#8997aa}
.join-card>h1{display:none}.mode-tabs{margin-top:15px}
.brand-mascot{width:43px;height:43px;object-fit:cover;border-radius:50%;border:1px solid #3a465d;background:#101827;filter:drop-shadow(0 4px 8px rgba(0,0,0,.35))}
.topbar .brand{gap:11px}.topbar .brand strong{letter-spacing:-.01em}
@media(max-width:980px){.landing-shell{grid-template-columns:1fr;max-width:720px}.landing-hero{min-height:590px}.landing-mascot{width:min(560px,86%);right:-34px}.join-card{max-height:none}.join-card:has(.admin-rooms-panel:not(.hidden)){width:100%}}
@media(max-width:620px){.join-view{padding:12px}.landing-shell{gap:14px}.landing-hero{min-height:520px;border-radius:20px}.landing-brand{padding:18px}.landing-mascot{width:115%;right:-90px;top:4px;opacity:.92}.landing-copy{padding:20px}.landing-copy h1{font-size:36px}.landing-copy p{font-size:14px}.landing-feature-row span{font-size:10px}.join-card{padding:22px;border-radius:20px}.brand-mascot{width:36px;height:36px}}

/* Fixed18: separated landing copy and floating mascot */
.landing-hero{min-height:680px;padding:0}
.landing-brand{
  position:relative;
  z-index:1;
  min-height:680px;
  height:auto;
  display:grid;
  grid-template-columns:minmax(300px,.9fr) minmax(360px,1.1fr);
  align-items:center;
  gap:24px;
  padding:42px;
}
.landing-copy{
  position:relative;
  z-index:2;
  max-width:none;
  padding:0;
  border:0;
  border-radius:0;
  background:transparent;
  backdrop-filter:none;
  box-shadow:none;
}
.landing-mascot-stage{
  position:relative;
  z-index:1;
  min-width:0;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:visible;
}
.landing-mascot{
  position:relative;
  inset:auto;
  width:min(560px,100%);
  max-height:590px;
  object-fit:contain;
  filter:drop-shadow(0 28px 38px rgba(0,0,0,.46));
  animation:sharkFloat 4.2s ease-in-out infinite;
  transform-origin:center center;
  will-change:transform;
}
@keyframes sharkFloat{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-16px)}
}
@media (prefers-reduced-motion:reduce){
  .landing-mascot{animation:none}
}
@media(max-width:980px){
  .landing-hero{min-height:auto}
  .landing-brand{min-height:620px;grid-template-columns:minmax(260px,.92fr) minmax(320px,1.08fr);padding:34px}
  .landing-mascot{width:min(500px,100%)}
}
@media(max-width:760px){
  .landing-brand{min-height:auto;grid-template-columns:1fr;gap:10px;padding:28px}
  .landing-copy{order:1;text-align:left}
  .landing-mascot-stage{order:2;min-height:330px}
  .landing-mascot{width:min(470px,96%);max-height:430px}
}
@media(max-width:620px){
  .landing-hero{min-height:auto}
  .landing-brand{padding:22px 18px 14px}
  .landing-copy h1{font-size:36px}
  .landing-mascot-stage{min-height:285px}
  .landing-mascot{position:relative;inset:auto;width:min(390px,108%);max-height:360px;opacity:1}
}

/* Fixed19: simplified hero copy and transparent mascot asset */
.landing-copy h1{margin-bottom:0}
.landing-mascot{background:transparent}

/* Fixed21: title above mascot, larger mascot, contact mascot */
.landing-brand{
  min-height:680px;
  display:flex;
  flex-direction:column;
  align-items:stretch;
  justify-content:flex-start;
  gap:8px;
  padding:34px 38px 20px;
}
.landing-copy{
  width:100%;
  flex:0 0 auto;
  text-align:left;
  z-index:3;
}
.landing-copy h1{
  font-size:clamp(38px,4.7vw,66px);
  line-height:1.03;
  white-space:normal;
}
.landing-mascot-stage{
  flex:1 1 auto;
  width:100%;
  min-height:0;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-top:-4px;
}
.landing-mascot{
  width:min(720px,108%);
  max-width:none;
  max-height:570px;
}
.contact-modal-card{
  width:min(390px,92%);
  padding-top:22px;
  overflow:hidden;
}
.contact-mascot{
  display:block;
  width:150px;
  height:150px;
  object-fit:contain;
  margin:-4px auto 2px;
  background:transparent;
  filter:drop-shadow(0 12px 18px rgba(0,0,0,.4));
  animation:contactSharkFloat 3.8s ease-in-out infinite;
}
@keyframes contactSharkFloat{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-7px)}
}
@media (prefers-reduced-motion:reduce){
  .contact-mascot{animation:none}
}
@media(max-width:980px){
  .landing-brand{min-height:620px;padding:30px 30px 16px}
  .landing-mascot{width:min(660px,108%);max-height:510px}
}
@media(max-width:620px){
  .landing-brand{padding:22px 18px 12px;gap:4px}
  .landing-copy h1{font-size:38px}
  .landing-mascot-stage{min-height:330px;margin-top:0}
  .landing-mascot{width:min(510px,118%);max-height:410px}
  .contact-mascot{width:125px;height:125px}
}

/* Fixed22: compiler status dashboard */
.engine-status-open{width:100%;margin:10px 0 4px;padding:10px 14px;border:1px solid #30394b;border-radius:10px;background:#111824;color:#b9c7db;font-weight:800;cursor:pointer}
.engine-status-open:hover{border-color:#e5484d;color:#fff;background:#171e2b}
.engine-status-modal-card{width:min(760px,calc(100vw - 28px));text-align:left;padding:26px}
.engine-status-title{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:20px;padding-right:34px}
.engine-status-title h2{margin:0 0 6px;font-size:24px}.engine-status-title p{margin:0;color:#8f9bad;font-size:13px;line-height:1.5}
.engine-status-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.engine-status-card{padding:16px;border:1px solid #2b3445;border-radius:13px;background:#0e1520;min-height:125px;transition:.2s}
.engine-status-card>div{display:flex;align-items:center;justify-content:space-between;gap:12px}.engine-status-card strong{font-size:18px}.engine-status-card p{margin:13px 0 8px;color:#aeb8c7;font-size:13px;line-height:1.5}.engine-status-card small{color:#69758a;word-break:break-all}
.engine-status-card.online{border-color:rgba(36,207,138,.55);box-shadow:inset 0 0 0 1px rgba(36,207,138,.08)}
.engine-status-card.degraded{border-color:rgba(245,183,0,.55)}.engine-status-card.offline{border-color:rgba(229,72,77,.65)}
.engine-state{padding:5px 9px;border-radius:999px;font-size:11px;font-weight:900;white-space:nowrap}.engine-state.checking{background:#202a3a;color:#a9b5c9}.engine-state.online{background:rgba(36,207,138,.13);color:#52e6aa}.engine-state.degraded{background:rgba(245,183,0,.13);color:#ffd467}.engine-state.offline{background:rgba(229,72,77,.14);color:#ff8c91}
.browser-c-status{margin-top:14px;padding:13px 15px;border:1px dashed #344056;border-radius:11px;display:grid;grid-template-columns:auto auto 1fr;align-items:center;gap:10px;color:#b8c3d3;font-size:12px}.browser-c-status strong{color:#fff}.browser-c-status span{padding:4px 8px;border-radius:999px;font-weight:900}.browser-c-status span.online{color:#52e6aa;background:rgba(36,207,138,.13)}.browser-c-status span.offline{color:#ff8c91;background:rgba(229,72,77,.14)}.browser-c-status small{color:#7f8ba0}
@media(max-width:680px){.engine-status-grid{grid-template-columns:1fr}.engine-status-title{display:block}.engine-status-title .mini-btn{margin-top:12px}.browser-c-status{grid-template-columns:1fr auto}.browser-c-status small{grid-column:1/-1}}

/* Fixed23: browser runtimes */
.browser-runtime-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}
.browser-runtime-grid .browser-c-status{margin-top:0;min-height:86px}
.browser-c-status span.checking{color:#ffd166;background:rgba(255,209,102,.12)}
#executionModeLabel small,#editExecutionModeLabel small{display:block;margin-top:7px;color:#8693aa;font-size:11px;line-height:1.45}
@media(max-width:680px){.browser-runtime-grid{grid-template-columns:1fr}}

/* Fixed27: 자동 줄맞춤 */
.format-code-btn{border:1px solid var(--border,#30394a);background:var(--surface-2,#182131);color:var(--text,#f5f7fb);border-radius:8px;padding:6px 10px;font-size:12px;font-weight:700;white-space:nowrap;cursor:pointer;transition:.18s ease}
.format-code-btn:hover{border-color:#e5484d;background:rgba(229,72,77,.12);color:#ff7b80}
.problem-code-toolbar{display:flex;align-items:center;justify-content:space-between;margin:14px 0 8px;font-size:13px;font-weight:800;color:var(--text,#f5f7fb)}
[data-theme="light"] .format-code-btn,body.light-theme .format-code-btn{background:#fff;color:#172033;border-color:#cbd3df}
[data-theme="light"] .format-code-btn:hover,body.light-theme .format-code-btn:hover{background:#fff1f2;color:#c72f39;border-color:#e5484d}
@media(max-width:700px){.format-code-btn{padding:5px 8px;font-size:11px}.editor-meta>span:first-child{display:none}}