:root{color-scheme:light;--panel: #fffdf8;--panel-2: #fbf5ea;--ink: #2b2620;--ink-soft: #5a5147;--muted: #8c8276;--accent: #3f6fa8;--accent-strong: #33598a;--accent-soft: #e9f0f7;--accent-2: #c2873b;--badge-bg: #f1e6d1;--badge-fg: #7c5a22;--line: #ece3d3;--line-strong: #e0d5c0;--danger: #b42318;--radius: 14px;--radius-lg: 20px;--radius-pill: 999px;--shadow-card: 0 1px 0 rgba(255, 255, 255, .7) inset, 0 22px 54px rgba(74, 58, 38, .16), 0 4px 12px rgba(74, 58, 38, .06);--shadow-soft: 0 8px 22px rgba(74, 58, 38, .08);--shadow-pop: 0 26px 64px rgba(74, 58, 38, .2);--ui-font: Inter, "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--blue: var(--accent);--blue-soft: var(--accent-soft);--sidebar: var(--accent-strong)}*{box-sizing:border-box}body{margin:0;min-width:320px;background:radial-gradient(1200px 600px at 18% -8%,#fcf7ed,transparent 60%),radial-gradient(900px 500px at 100% 0%,#f8f1e4,transparent 55%),linear-gradient(180deg,#f7f2e8,#f2ebdd);background-attachment:fixed;color:var(--ink);font-family:var(--ui-font);-webkit-font-smoothing:antialiased}button,input,select{font-family:inherit}.authGateShell{min-height:100vh;background:radial-gradient(1200px 600px at 18% -8%,#fcf7ed,transparent 60%),radial-gradient(900px 500px at 100% 0%,#f8f1e4,transparent 55%),linear-gradient(180deg,#f7f2e8,#f2ebdd)}.authServiceShell{display:grid;align-content:center;min-height:100vh;max-width:520px;margin:0 auto;padding:32px 24px}.authCard{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--panel);box-shadow:var(--shadow-pop);padding:20px}.authCardGate{padding:40px 38px 30px}.authCardHeaderGate{align-items:end}.authBackButton{display:inline-flex;align-items:center;gap:8px;border:0;background:transparent;color:var(--ink-soft);padding:0;font-weight:700;cursor:pointer}.authBackButton span{font-size:1.1rem;line-height:1}.authMark{display:grid;width:72px;height:72px;margin:0 auto 22px;place-items:center;border-radius:22px;background:linear-gradient(160deg,var(--accent) 0%,var(--accent-strong) 100%);color:#fff;box-shadow:var(--shadow-soft);font-size:1.9rem}.authTitleBlock{margin-bottom:26px;text-align:center}.authTitleBlock h1{margin:0;font-size:clamp(1.8rem,4vw,2.4rem);font-weight:900;line-height:1.12;letter-spacing:-.01em;color:var(--ink)}.authTitleBlock p{margin:12px 0 0;color:var(--muted);font-size:1rem;line-height:1.6}.authTitleBlockCompact{margin-top:10px;margin-bottom:18px}.authTitleBlockTop{margin-top:0}.authSectionLabel{margin:0 0 2px;color:var(--ink-soft);font-size:.92rem;font-weight:800}.authCardHeader{display:flex;align-items:center;justify-content:space-between;gap:16px}.authEyebrow{margin:0 0 8px;color:var(--accent);font-size:.8rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase}.authCardHeader h2{margin:0;font-size:1.5rem;font-weight:800;line-height:1.1}.authCardHint{margin:0;color:var(--muted);font-size:.9rem;line-height:1.5}.authAction,.authSubmit,.authModeButton{min-height:44px;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--panel);color:var(--ink);padding:10px 14px;cursor:pointer;transition:border-color .15s ease,background .15s ease}.authAction:hover,.authSubmit:hover,.authModeButton:hover,.authAction:focus-visible,.authSubmit:focus-visible,.authModeButton:focus-visible{border-color:var(--accent)}.authModeTabs{display:inline-grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:18px}.authModeButton[data-active=true]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-strong);font-weight:800}.authForm{display:grid;gap:14px;margin-top:18px}.authField{display:grid;gap:8px}.authField span{font-size:.92rem;font-weight:700;color:var(--ink-soft)}.authField input{width:100%;min-height:52px;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--panel);color:var(--ink);padding:10px 14px}.authField input:focus{outline:2px solid rgba(63,111,168,.2);border-color:var(--accent)}.authFieldIcon{position:relative}.authFieldIconMark{position:absolute;top:50%;left:18px;z-index:1;transform:translateY(-50%);color:var(--muted);font-size:1.05rem;font-weight:700;line-height:1;pointer-events:none}.authFieldIcon input{padding-left:46px}.authSubmit{width:100%;background:linear-gradient(160deg,var(--accent) 0%,var(--accent-strong) 100%);border-color:transparent;color:#fff;font-weight:800}.authSubmitPrimary{min-height:56px;border-radius:var(--radius);background:linear-gradient(160deg,var(--accent) 0%,var(--accent-strong) 100%);border-color:transparent;box-shadow:var(--shadow-soft);font-size:1.05rem;font-weight:800}.rememberRow{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.95rem}.rememberRow input{width:17px;height:17px;accent-color:var(--accent)}.authSwitchRow{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:22px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:.95rem}.authSwitchRowSecondary{margin-top:10px;padding-top:0;border-top:0}.authGuestRow{display:grid;gap:10px;margin-top:18px;padding-top:20px;border-top:1px solid var(--line);text-align:center}.authGuestButton{width:100%;min-height:54px;border:1.5px solid var(--accent-soft);border-radius:var(--radius);background:var(--accent-soft);color:var(--accent-strong);padding:10px 14px;font-weight:800;cursor:pointer;transition:border-color .15s ease,filter .15s ease}.authGuestButton:hover,.authGuestButton:focus-visible{border-color:var(--accent);filter:brightness(.98)}.authGuestRow p{margin:0;color:var(--muted);font-size:.88rem;line-height:1.55}.authTextButton{border:0;background:transparent;color:var(--accent);padding:0;font-weight:800;cursor:pointer}.authFormGate{max-width:none}.authSignedIn{display:grid;gap:8px;margin-top:18px}.authSignedIn strong{font-size:1rem}.authSignedIn p,.authMessage{margin:0;color:var(--muted);line-height:1.6}.authMessage{margin-top:16px}.authMessage.is-error{color:var(--danger)}.authModalLayer{position:fixed;inset:0;z-index:60;display:grid;place-items:center;background:#281e166b;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);padding:24px}.authModal{width:min(420px,100%);border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--panel);box-shadow:var(--shadow-pop);padding:28px 24px 22px;text-align:center}.authModal h2{margin:0;color:var(--ink);font-size:1.45rem;font-weight:800;line-height:1.2}.authModal p{margin:14px 0 0;color:var(--muted);line-height:1.65}.authModalButton{width:100%;min-height:54px;margin-top:22px;border:0;border-radius:var(--radius);background:linear-gradient(160deg,var(--accent) 0%,var(--accent-strong) 100%);color:#fff;font-size:1.02rem;font-weight:800;cursor:pointer;box-shadow:var(--shadow-soft)}.shell{position:relative;min-height:100vh;min-height:100dvh}.sidebar{position:fixed;top:0;left:0;z-index:40;display:flex;flex-direction:column;gap:22px;width:268px;height:100vh;height:100dvh;max-height:100dvh;overflow-y:auto;overscroll-behavior:contain;padding:22px;padding-bottom:calc(22px + env(safe-area-inset-bottom,0px));background:var(--panel);color:var(--ink);border-right:1px solid var(--line);box-shadow:var(--shadow-soft);transform:translate(0);transition:transform .2s ease}.sidebar[data-collapsed=true]{transform:translate(-110%)}.brand{display:inline-flex;align-items:center;gap:12px;color:inherit;text-decoration:none}.brandMark{display:grid;width:42px;height:42px;place-items:center;border-radius:13px;background:linear-gradient(160deg,var(--accent) 0%,var(--accent-strong) 100%);color:#fff;font-weight:900;box-shadow:var(--shadow-soft)}.brand strong,.brand small{display:block}.brand strong{color:var(--ink);font-weight:800;font-size:.92rem;line-height:1.2}.brand small{color:var(--muted);font-size:.74rem;margin-top:3px}.navLabel{margin:2px 4px 0;color:var(--muted);font-size:.74rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase}.tabList{display:grid;gap:10px;min-height:0}.tabButton{display:grid;grid-template-columns:42px minmax(0,1fr);align-items:center;gap:12px;width:100%;border:1px solid var(--line);border-radius:var(--radius);background:transparent;color:var(--ink);padding:11px;text-align:left;cursor:pointer;transition:border-color .16s ease,background .16s ease}.tabChip{display:grid;width:42px;height:42px;place-items:center;border-radius:12px;background:var(--accent-soft);color:var(--accent-strong);font-size:.82rem;font-weight:900}.tabBody{display:grid;gap:2px;min-width:0}.tabBody strong{overflow-wrap:anywhere;color:var(--ink);font-size:.98rem;font-weight:800}.tabBody small{color:var(--muted);font-size:.78rem}.tabButton:hover,.tabButton:focus-visible{border-color:var(--accent);background:var(--panel-2)}.tabButton[data-active=true]{border-color:transparent;background:var(--accent-soft)}.tabButton[data-active=true] .tabBody strong{color:var(--accent-strong)}.tabButton[data-active=true] .tabChip{background:var(--accent);color:#fff}.sideAccount{margin-top:auto;display:grid;gap:10px;flex:0 0 auto;padding-top:16px;padding-bottom:env(safe-area-inset-bottom,0px);border-top:1px solid var(--line)}.sideUser{display:flex;align-items:center;gap:10px}.sideAvatar{display:grid;width:36px;height:36px;place-items:center;border-radius:50%;background:var(--badge-bg);color:var(--badge-fg);font-weight:800}.sideUserText{display:grid}.sideUserText strong{color:var(--ink);font-size:.9rem;font-weight:700}.sideUserText small{color:var(--muted);font-size:.76rem}.sideLogout{min-height:42px;border-radius:var(--radius);border:1px solid var(--line-strong);background:var(--panel);color:var(--ink-soft);font-weight:700;cursor:pointer;transition:border-color .15s ease,color .15s ease}.sideLogout:hover:not(:disabled){border-color:var(--accent);color:var(--accent-strong)}.sideLogout:disabled{opacity:.6;cursor:not-allowed}.sidebarBackdrop{display:none;position:fixed;inset:0;z-index:30;border:0;background:#2b262052;transition:opacity .18s ease}.mainCol{margin-left:0;min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;transition:margin-left .2s ease}.shell[data-sidebar-collapsed=false] .mainCol{margin-left:268px}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:14px;padding:14px 24px;background:color-mix(in srgb,var(--panel) 82%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.topbarToggle{display:grid;place-items:center;width:42px;height:42px;border-radius:var(--radius-pill);border:1px solid var(--line-strong);background:var(--panel);color:var(--ink-soft);font-size:1.15rem;cursor:pointer;transition:border-color .15s ease,color .15s ease}.topbarToggle:hover{border-color:var(--accent);color:var(--accent-strong)}.topbarTitle{display:grid}.topbarTitle strong{font-weight:800;font-size:1.02rem;color:var(--ink)}.topbarTitle small{color:var(--muted);font-size:.78rem}.workspace{flex:1;display:flex;padding:0}.appMount{flex:1;display:flex;min-height:0;background:transparent}.frameShell{flex:1;display:flex;overflow:visible;border:0;background:transparent}.studyFrame{display:block;width:100%;height:calc(100vh - 71px);min-height:calc(100vh - 71px);height:calc(100dvh - 71px);min-height:calc(100dvh - 71px);border:0;background:transparent}@media(max-width:760px){.sidebar{width:min(300px,calc(100vw - 22px));height:100vh;height:100dvh;max-height:100dvh;padding:18px;padding-bottom:calc(18px + env(safe-area-inset-bottom,0px));box-shadow:0 18px 60px #4a3a2638}.sidebarBackdrop{display:block}.shell[data-sidebar-collapsed=true] .sidebarBackdrop{opacity:0;pointer-events:none;visibility:hidden}.shell[data-sidebar-collapsed=false] .sidebarBackdrop{opacity:1;pointer-events:auto;visibility:visible}.shell[data-sidebar-collapsed=false] .mainCol{margin-left:0}.tabButton{grid-template-columns:42px minmax(0,1fr)}.authServiceShell{min-height:100vh;padding-top:36px;padding-bottom:36px}.authCardGate{padding-left:22px;padding-right:22px}.authCardHeader{align-items:start;flex-direction:column}}