@layer crack{@scope(#crack__app){:scope{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--orbi-fixed-white:#fff;--orbi-fixed-black:#000;--orbi-primary-50:#eff8ff;--orbi-primary-100:#c5e0fd;--orbi-primary-300:#84caff;--orbi-primary-400:#53b1fd;--orbi-primary-500:#2e90fa;--orbi-primary-600:#1570ef;--orbi-primary-650:#1871d7;--orbi-primary-700:#305ed4;--orbi-primary-900:#33478f;--orbi-gray-25:#fcfdfd;--orbi-gray-50:#f9f9f9;--orbi-gray-100:#eee;--orbi-gray-200:#dedfdf;--orbi-gray-300:#b7b7b7;--orbi-gray-400:#878787;--orbi-gray-500:#676767;--orbi-gray-700:#373737;--orbi-gray-800:#171717;--orbi-success-500:#12b76a;--orbi-warning-500:#f79009;--orbi-error-500:#fd443b;--orbi-amber-500:#ffac48;--crack-bg:var(--orbi-gray-50);--crack-surface:var(--orbi-fixed-white);--crack-surface-strong:var(--orbi-gray-50);--crack-surface-elevated:var(--orbi-fixed-white);--crack-text:var(--orbi-gray-800);--crack-muted:var(--orbi-gray-500);--crack-line:var(--orbi-gray-100);--crack-line-strong:var(--orbi-gray-200);--crack-primary:var(--orbi-primary-650);--crack-primary-strong:var(--orbi-primary-700);--crack-primary-hover:var(--orbi-primary-700);--crack-primary-soft:var(--orbi-primary-50);--crack-accent:var(--orbi-primary-650);--crack-on-primary:var(--orbi-fixed-white);--crack-focus:color-mix(in oklab, var(--orbi-primary-500) 28%, transparent);--crack-safe:var(--orbi-success-500);--crack-semi:var(--orbi-warning-500);--crack-danger:var(--orbi-error-500);--crack-rank:var(--orbi-amber-500);--crack-ink-edge:var(--orbi-gray-200);--crack-shadow:0 1px 2px #0000000a;--crack-shadow-lg:0 8px 24px #0f172a1a;--crack-shadow-sticker:var(--crack-shadow);--crack-shadow-sticker-press:none;--crack-radius-xs:4px;--crack-radius-sm:8px;--crack-radius-md:12px;--crack-radius-lg:16px;--crack-radius-xl:20px;--crack-radius-pill:999px;--crack-space-1:4px;--crack-space-2:8px;--crack-space-3:12px;--crack-space-4:16px;--crack-space-5:20px;--crack-space-6:24px;--crack-space-8:32px;--crack-space-12:48px;--crack-font:"Pretendard Variable", Pretendard, system-ui, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Source Han Sans", "Malgun Gothic", sans-serif;--crack-font-display:var(--crack-font);--crack-font-accent:var(--crack-font);--crack-text-size:14px;--crack-leading:1.57;--crack-tracking-display:-.04em;--crack-tracking-tight:-.025em;--crack-tracking-body:-.02em;--crack-tracking-eyebrow:.04em;min-height:100dvh;font-family:var(--crack-font);font-size:var(--crack-text-size);line-height:var(--crack-leading);letter-spacing:var(--crack-tracking-body);background:var(--crack-bg);color:var(--crack-text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility;word-break:keep-all;font-weight:400}:scope.dark,.dark{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--orbi-fixed-white:#fff;--orbi-fixed-black:#000;--orbi-primary-50:#0f1d2f;--orbi-primary-100:#162944;--orbi-primary-300:#2d5a8a;--orbi-primary-400:#53b1fd;--orbi-primary-500:#2e90fa;--orbi-primary-600:#1570ef;--orbi-primary-650:#1871d7;--orbi-primary-700:#305ed4;--orbi-primary-900:#33478f;--orbi-gray-25:#1a1a1a;--orbi-gray-50:#1e1e1e;--orbi-gray-100:#2a2a2a;--orbi-gray-200:#3a3a3a;--orbi-gray-300:#4a4a4a;--orbi-gray-400:#6a6a6a;--orbi-gray-500:#8a8a8a;--orbi-gray-700:#cacaca;--orbi-gray-800:#e5e5e5;--orbi-success-500:#32d583;--orbi-warning-500:#fdb022;--orbi-error-500:#f97066;--orbi-amber-500:#ffac48;--crack-bg:var(--orbi-fixed-black);--crack-surface:var(--orbi-gray-50);--crack-surface-strong:var(--orbi-gray-100);--crack-surface-elevated:var(--orbi-gray-100);--crack-text:var(--orbi-gray-800);--crack-muted:var(--orbi-gray-500);--crack-line:var(--orbi-gray-200);--crack-line-strong:var(--orbi-gray-300);--crack-primary:var(--orbi-primary-650);--crack-primary-strong:var(--orbi-primary-300);--crack-primary-hover:var(--orbi-primary-600);--crack-primary-soft:var(--orbi-primary-100);--crack-accent:var(--orbi-primary-400);--crack-on-primary:var(--orbi-fixed-white);--crack-focus:color-mix(in oklab, var(--orbi-primary-400) 36%, transparent);--crack-ink-edge:var(--orbi-gray-200);--crack-shadow:none;--crack-shadow-lg:0 8px 24px #00000080}}@scope(#crack__app){*{box-sizing:border-box}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}:where(a,button,input,textarea,select,[tabindex]):focus-visible{outline:2px solid var(--crack-accent);outline-offset:2px;border-radius:var(--crack-radius-xs)}.app-shell{min-height:100dvh;padding:max(env(safe-area-inset-top), 14px) 16px max(env(safe-area-inset-bottom), 20px)}.app-shell--tabbed{padding-bottom:calc(72px + env(safe-area-inset-bottom))}.app-shell--chat{flex-direction:column;height:100dvh;min-height:0;padding-bottom:0;display:flex}.appbar{justify-content:space-between;align-items:center;gap:12px;max-width:1040px;margin:0 auto 18px;display:flex}.brand{align-items:center;gap:9px;display:flex}.brand-mark{flex-shrink:0;width:34px;height:34px;display:block}.brand-mark svg{display:block}.brand-word{letter-spacing:-.03em;font-size:1.22rem;font-weight:800}.appbar__tag{font-family:var(--crack-font-accent);letter-spacing:.22em;text-transform:uppercase;color:var(--crack-muted);font-size:.64rem;font-weight:500}.tabbar{z-index:30;padding:8px 12px max(env(safe-area-inset-bottom), 10px);background:var(--crack-surface);border-top:1px solid var(--crack-line);grid-auto-columns:1fr;grid-auto-flow:column;align-items:center;gap:4px;display:grid;position:fixed;bottom:0;left:0;right:0}.tab{border-radius:var(--crack-radius-sm);min-height:52px;color:var(--crack-muted);letter-spacing:-.01em;cursor:pointer;background:0 0;border:0;flex-direction:column;justify-content:center;align-items:center;gap:3px;font-size:.7rem;font-weight:700;transition:color .14s,background .14s;display:inline-flex}.tab:hover{color:var(--crack-text)}.tab.active{color:var(--crack-primary)}.tab:disabled{opacity:.4;cursor:not-allowed}.tab svg{stroke-width:2.1px}.pill,.button{border:1px solid var(--crack-line-strong);border-radius:var(--crack-radius-pill);cursor:pointer;white-space:nowrap;min-height:44px;letter-spacing:var(--crack-tracking-tight);align-items:center;gap:8px;padding:0 18px;font-weight:700;transition:background .16s,border-color .16s,color .16s,box-shadow .16s,transform .12s;display:inline-flex}.pill{background:var(--crack-surface);color:var(--crack-muted)}.pill[aria-pressed=true]{background:var(--crack-primary-soft);border-color:var(--crack-primary);color:var(--crack-accent)}.pill:hover{border-color:color-mix(in oklab, var(--crack-primary) 40%, var(--crack-line-strong));color:var(--crack-text)}.button{background:var(--crack-primary);color:var(--crack-on-primary);border-radius:var(--crack-radius-sm);box-shadow:var(--crack-shadow);border-color:#0000;flex-shrink:0;justify-content:center;font-weight:800}.button:hover{background:var(--crack-primary-hover)}.button:active{transform:translateY(1px)}.button.secondary{background:var(--crack-surface-strong);color:var(--crack-text);border:1px solid var(--crack-line-strong);border-radius:var(--crack-radius-sm);box-shadow:none}.button.secondary:hover{background:var(--crack-line)}.grid{gap:16px;max-width:1040px;margin:0 auto;display:grid}.section{max-width:1040px;margin:0 auto 36px}.section h1,.section h2{font-family:var(--crack-font-display);letter-spacing:var(--crack-tracking-display);word-break:keep-all;text-wrap:balance;margin:0 0 12px}.section h1{font-size:clamp(1.7rem,6vw,2.4rem);font-weight:800;line-height:1.18}.section h2{font-size:1.3rem;font-weight:700;line-height:1.25}.eyebrow{font-family:var(--crack-font-accent);color:var(--crack-accent);letter-spacing:var(--crack-tracking-eyebrow);text-transform:uppercase;margin:0 0 12px;font-size:.7rem;font-weight:600}.section h1+.muted,.section h2+.muted,.lede{max-width:48ch;margin-top:4px;font-size:1.02rem}.muted{color:var(--crack-muted);word-break:keep-all;letter-spacing:var(--crack-tracking-body);line-height:1.6}.section-head{justify-content:space-between;align-items:baseline;gap:12px;max-width:1040px;margin:0 auto 14px;display:flex}.section-head h2{margin:0}.section-head .more{font-family:var(--crack-font-accent);color:var(--crack-muted);letter-spacing:.02em;white-space:nowrap;font-size:.74rem;font-weight:600}.card{background:var(--crack-surface);border:1px solid var(--crack-line);border-radius:var(--crack-radius-lg);box-shadow:var(--crack-shadow);transition:box-shadow .16s,transform .14s;overflow:hidden}a.card:hover{box-shadow:var(--crack-shadow-sticker);transform:translate(-1px,-1px)}.work-card{aspect-ratio:3/4;border-radius:var(--crack-radius-lg);background:var(--crack-surface-strong);border:1px solid var(--crack-line);box-shadow:var(--crack-shadow);isolation:isolate;transition:transform .18s,box-shadow .18s;display:block;position:relative;overflow:hidden}.work-card:hover{box-shadow:var(--crack-shadow-sticker);transform:translate(-2px,-2px)}.work-card .cover{object-fit:cover;width:100%;height:100%;transition:transform .4s;display:block;position:absolute;inset:0}.work-card__head{justify-content:space-between;align-items:flex-start;gap:8px;display:flex;position:absolute;top:9px;left:9px;right:9px}.work-card__foot{background:var(--crack-surface);border-top:1px solid var(--crack-line);gap:1px;padding:9px 11px;display:grid;position:absolute;bottom:0;left:0;right:0}.work-card__title{font-family:var(--crack-font-display);color:var(--crack-text);letter-spacing:-.02em;-webkit-line-clamp:1;-webkit-box-orient:vertical;font-size:.98rem;font-weight:800;line-height:1.25;display:-webkit-box;overflow:hidden}.work-card__meta{font-family:var(--crack-font-accent);color:var(--crack-muted);letter-spacing:.01em;white-space:nowrap;text-overflow:ellipsis;align-items:center;gap:5px;font-size:.72rem;font-weight:500;display:flex;overflow:hidden}.rank{background:var(--crack-rank);color:#171717;border-radius:var(--crack-radius-xs);letter-spacing:-.01em;font-variant-numeric:tabular-nums;align-items:center;min-height:22px;padding:0 7px;font-size:.82rem;font-weight:800;line-height:1;display:inline-flex}.work-card .badge{color:#fff;background:#1717179e;border-color:#ffffff3d}.work-card .badge.safe{color:#6fe6a8}.work-card .badge.semi{color:#ffce6a}.poster-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;max-width:1040px;margin:0 auto;display:grid}.rail{scrollbar-width:none;cursor:grab;gap:12px;margin:0 -16px;padding:2px 16px 8px;display:flex;overflow-x:auto}.rail.rail--grabbing{cursor:grabbing;-webkit-user-select:none;user-select:none}.rail::-webkit-scrollbar{display:none}.rail>.work-card{flex:none;width:clamp(144px,44vw,188px)}.spotlight{aspect-ratio:4/5;box-shadow:var(--crack-shadow-sticker);margin-bottom:18px}.spotlight .work-card__foot{gap:5px;padding:15px 16px}.spotlight .work-card__title{-webkit-line-clamp:2;font-size:clamp(1.4rem,5.5vw,2.2rem);line-height:1.18}.spotlight .work-card__meta{white-space:normal;font-size:.8rem}.spotlight .rank{min-height:28px;font-size:.98rem}.spotlight__cta{justify-self:start;margin-top:10px}.work-detail{max-width:1040px;margin:0 auto}.work-hero{aspect-ratio:4/5;border-radius:var(--crack-radius-lg);isolation:isolate;background:var(--crack-surface-strong);border:1px solid var(--crack-line);box-shadow:var(--crack-shadow);position:relative;overflow:hidden}.work-hero__cover{object-fit:cover;width:100%;height:100%;display:block;position:absolute;inset:0}.icon-button{border-radius:var(--crack-radius-pill);color:#fff;background:#1717179e;border:1px solid #ffffff3d;justify-content:center;align-items:center;width:40px;height:40px;display:inline-flex}.work-hero__back{position:absolute;top:12px;left:12px}.work-hero__body{background:var(--crack-surface);border-top:1px solid var(--crack-line);gap:8px;padding:15px 18px;display:grid;position:absolute;bottom:0;left:0;right:0}.work-hero__title{font-family:var(--crack-font-display);color:var(--crack-text);letter-spacing:-.025em;margin:0;font-size:clamp(1.7rem,6.5vw,2.7rem);font-weight:800;line-height:1.14}.work-hero__summary{color:var(--crack-muted);-webkit-line-clamp:3;-webkit-box-orient:vertical;max-width:54ch;margin:0;font-size:.95rem;line-height:1.55;display:-webkit-box;overflow:hidden}.work-detail__body{gap:14px;margin-top:18px;display:grid}.work-stats{font-family:var(--crack-font-accent);color:var(--crack-muted);flex-wrap:wrap;align-items:center;gap:6px 16px;font-size:.82rem;display:flex}.work-stats strong{color:var(--crack-text);font-weight:600}.work-detail__cta-row{gap:10px;display:flex}.work-detail__cta{flex:1;min-height:52px}.chat-shell{flex-direction:column;flex:1;width:100%;max-width:720px;min-height:0;margin:0 auto;display:flex;overflow:hidden}.character-header{background:var(--crack-surface-elevated);border:1px solid var(--crack-line-strong);border-radius:var(--crack-radius-lg);box-shadow:var(--crack-shadow);z-index:5;grid-template-columns:54px 1fr;align-items:center;gap:10px;margin-bottom:14px;padding:12px;display:grid;position:sticky;top:8px}.scenario-banner{background:var(--crack-surface-elevated);border:1px solid var(--crack-line);border-left:3px solid var(--crack-accent);border-radius:var(--crack-radius-md);box-shadow:var(--crack-shadow);color:color-mix(in oklab, currentColor 82%, transparent);white-space:pre-wrap;word-break:keep-all;z-index:4;margin-bottom:12px;padding:11px 14px;font-size:.86rem;line-height:1.55;position:sticky;top:76px}.scenario-picker{background:var(--crack-surface-elevated);border:1px solid var(--crack-line);border-radius:var(--crack-radius-lg);box-shadow:var(--crack-shadow);gap:12px;margin-bottom:12px;padding:16px;display:grid}.scenario-picker h2{letter-spacing:var(--crack-tracking-tight);margin:0;font-size:1.05rem;font-weight:800}.scenario-picker-hint{color:var(--crack-muted);margin:-6px 0 2px;font-size:.82rem}.scenario-options{gap:8px;display:grid}.scenario-option{background:var(--crack-surface);border:1px solid var(--crack-line-strong);border-radius:var(--crack-radius-md);cursor:pointer;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:12px;min-height:56px;padding:12px 14px;transition:border-color .15s,background .15s,box-shadow .15s;display:grid}.scenario-option:hover{border-color:color-mix(in oklab, var(--crack-primary) 45%, var(--crack-line-strong))}.scenario-option:focus-within{border-color:var(--crack-primary);box-shadow:0 0 0 3px var(--crack-focus)}.scenario-option.selected{background:var(--crack-primary-soft);border-color:var(--crack-primary)}.scenario-option input[type=radio]{accent-color:var(--crack-primary);block-size:18px;inline-size:18px;margin:0}.scenario-option-body{gap:3px;min-width:0;display:grid}.scenario-option-title{letter-spacing:var(--crack-tracking-tight);font-weight:800;line-height:1.3}.scenario-option-desc{color:var(--crack-muted);-webkit-line-clamp:2;word-break:keep-all;-webkit-box-orient:vertical;font-size:.82rem;line-height:1.45;display:-webkit-box;overflow:hidden}.scenario-option.selected .scenario-option-title{color:var(--crack-primary)}.scenario-custom{min-height:88px}.scenario-error{color:var(--crack-danger);word-break:keep-all;font-size:.82rem;font-weight:700}.scenario-start{width:100%;margin-top:2px}.tutor-start-actions{gap:8px;margin-top:2px;display:flex}.tutor-start-actions .scenario-start{flex:auto;width:auto;margin-top:0}.tutor-start-actions .tutor-skip{flex:none}.tutor-grade-group{gap:8px;display:flex}.tutor-grade-group .tutor-grade-chip{flex:1 1 0;justify-content:center;min-width:0;padding:0 8px}.character-avatar,.message-avatar{aspect-ratio:1;border:1px solid var(--crack-line);object-fit:cover;border-radius:14px}.character-avatar{width:54px;height:54px}.character-copy{gap:2px;min-width:0;display:grid}.character-name{letter-spacing:var(--crack-tracking-display);font-size:1.05rem;font-weight:800}.character-badges{flex-wrap:wrap;grid-column:1/-1;gap:6px;display:flex}.card-body{align-content:start;gap:7px;padding:16px 18px 18px;display:grid}.card-body strong{letter-spacing:var(--crack-tracking-tight);font-size:1.05rem;font-weight:700;line-height:1.3}.card-body>.muted{font-size:.875rem;line-height:1.5}.card-body>.badge{justify-self:start}.badge-row{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.badge{background:var(--crack-surface-strong);border:1px solid var(--crack-line);border-radius:var(--crack-radius-pill);color:var(--crack-muted);font-variant-numeric:tabular-nums;align-items:center;gap:4px;min-height:28px;padding:0 10px;font-size:.76rem;font-weight:700;display:inline-flex}.badge.safe{color:var(--crack-safe);border-color:color-mix(in oklab, var(--crack-safe) 30%, var(--crack-line));background:color-mix(in oklab, var(--crack-safe) 8%, var(--crack-surface))}.badge.semi{color:var(--crack-semi);border-color:color-mix(in oklab, var(--crack-semi) 30%, var(--crack-line));background:color-mix(in oklab, var(--crack-semi) 8%, var(--crack-surface))}.badge.tutor{color:#7eb8ff;border-color:color-mix(in oklab, #7eb8ff 30%, var(--crack-line));background:color-mix(in oklab, #7eb8ff 8%, var(--crack-surface))}.button:disabled,.pill:disabled,.badge:disabled{cursor:not-allowed;opacity:.48;box-shadow:none;transform:none}.chat-list{min-width:0;min-height:0;padding-bottom:calc(124px + env(safe-area-inset-bottom));flex:1;align-content:start;gap:12px;display:grid;overflow-y:auto}.message-row{grid-template-columns:32px minmax(0,1fr);align-items:end;gap:8px;display:grid}.message-row.user{grid-template-columns:minmax(0,1fr);justify-items:end}.message-row.ai:not(.with-avatar){padding-left:40px}.message-avatar{width:32px;height:32px}.bubble{border-radius:var(--crack-radius-lg);word-break:keep-all;gap:8px;min-width:0;max-width:min(86%,560px);padding:12px 15px;line-height:1.55;display:grid}.bubble p{white-space:pre-wrap;margin:0}.message-md{gap:6px;min-width:0;display:grid}.message-md-run{min-width:0;display:inline}.message-md>:first-child{margin-top:0}.message-md>:last-child{margin-bottom:0}.message-md p{white-space:normal;margin:0}.message-md strong{font-weight:800}.message-md em{font-style:italic}.message-action{color:var(--crack-accent);font-style:italic;font-weight:700}.bubble.user .message-action{color:color-mix(in oklab, currentColor 88%, white)}.message-md a{color:var(--crack-accent);word-break:break-all;text-decoration:underline}.bubble.user .message-md a{color:inherit}.message-md ul,.message-md ol{margin:0;padding-left:1.25em}.message-md li{margin:2px 0}.message-md ol.message-md-bubble-list{padding-left:0;list-style:none}.message-md table{border-collapse:collapse;width:auto;margin:4px 0;font-size:.95em;display:block;overflow-x:auto}.message-md th,.message-md td{border:1px solid var(--crack-line);text-align:left;padding:4px 8px}.message-md thead th{font-weight:700}.message-md h1,.message-md h2,.message-md h3,.message-md h4{margin:0;font-size:1rem;font-weight:800}.message-md blockquote{border-left:3px solid color-mix(in oklab, currentColor 35%, transparent);color:color-mix(in oklab, currentColor 78%, transparent);margin:0;padding-left:10px}.message-md code{background:color-mix(in oklab, currentColor 14%, transparent);border-radius:6px;padding:1px 5px;font-size:.92em}.message-md pre{background:color-mix(in oklab, currentColor 12%, transparent);border-radius:12px;margin:0;padding:10px 12px;overflow-x:auto}.message-md pre code{background:0 0;padding:0}.message-md .katex-display,.message-block-latex .katex-display{margin:.35em 0;padding:2px 0;overflow:auto hidden}.message-md .katex,.message-block-latex .katex{font-size:1.02em}.message-block-latex p{margin:0}.message-block-latex-fallback{margin:.35em 0;overflow-x:auto}.message-block-latex-fallback code{background:color-mix(in oklab, currentColor 12%, transparent);white-space:pre-wrap;word-break:break-word;border-radius:6px;padding:2px 6px;font-size:.92em;display:inline-block}.message-bank-reference{color:color-mix(in oklab, currentColor 45%, transparent);margin-top:2px;font-size:.72rem}.message-block-structured-passage,.message-block-structured-problem,.message-block-labeled-box,.message-block-shared-group{border:1px solid var(--crack-line);border-radius:var(--crack-radius-md);gap:6px;margin:6px 0;padding:10px 12px;display:grid}.message-block-shared-group{gap:10px}.message-block-passage-title{font-weight:700}.message-block-passage-part{gap:4px;display:grid}.message-block-part-label{font-weight:800}.message-block-line-start{color:color-mix(in oklab, currentColor 55%, transparent);font-variant-numeric:tabular-nums;margin-right:6px;font-size:.72rem}.message-block-inline-mark{display:inline}.message-block-inline-mark.mark-underline{text-underline-offset:2px;text-decoration:underline}.message-block-inline-mark.mark-blank{border-bottom:1px dashed;min-width:2.5em;display:inline-block}.message-block-mark-label{margin-right:1px;font-weight:700}.message-block-footnotes{color:color-mix(in oklab, currentColor 70%, transparent);grid-template-columns:auto 1fr;gap:0 6px;margin:2px 0 0;font-size:.8rem;display:grid}.message-block-footnotes dt{font-weight:700}.message-block-footnotes 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