:root{color:#0f172a;background:#fff;--page: #ffffff;--surface: #ffffff;--surface-soft: #f0fdfa;--surface-warm: #fffbeb;--border: #dbe7e8;--border-strong: #0f172a;--text: #0f172a;--muted: #5f6f79;--teal: #0f766e;--teal-dark: #115e59;--teal-soft: #ccfbf1;--yellow: #fde047;--danger: #b42318;--shadow: 0 22px 60px rgba(15, 23, 42, .1);--comic-shadow: 3px 3px 0 rgba(15, 23, 42, .18);font-family:Inter,Noto Sans JP,Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,ui-sans-serif,system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.app-frame{background:var(--page);min-height:100vh}.app-content{min-height:calc(100vh - 64px)}.global-menu{align-items:center;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#ffffffeb;border-bottom:1px solid rgba(203,213,225,.8);display:grid;gap:16px;grid-template-columns:auto minmax(120px,1fr) auto;min-height:64px;padding:10px clamp(16px,5vw,48px);position:sticky;top:0;z-index:20}.global-brand,.global-nav,.global-account{align-items:center;display:flex}.global-brand{color:var(--teal-dark);font-weight:900;gap:10px;text-decoration:none}.global-brand>img{display:block;height:48px;object-fit:contain;width:auto}.global-nav{gap:8px;justify-content:flex-start}.global-nav a,.global-account-action,.global-account button{align-items:center;border-radius:8px;color:#475569;display:inline-flex;font-weight:800;gap:7px;min-height:40px;padding:0 12px;text-decoration:none}.global-nav a{background:#fff;border:2px solid transparent;border-radius:8px;color:#334155;min-height:38px;padding:0 11px;transition:background .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease}.global-nav a.active{background:var(--yellow);border-color:var(--border-strong);box-shadow:var(--comic-shadow);color:var(--text)}.global-nav a:hover{border-color:var(--border-strong);transform:translateY(-1px)}.global-account-action.active{color:var(--teal)}.global-account{gap:8px;justify-content:flex-end;min-width:0}.global-account span{color:var(--muted);font-size:.86rem;font-weight:700;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.global-account button{background:#f1f5f9;border:1px solid #e2e8f0;color:#334155}.global-account-action{background:#fff;border:1px solid transparent;min-width:40px;padding:0;justify-content:center}.global-account-action:hover,.global-account button:hover{border-color:#cbd5e1}.home-shell{align-items:center;background:#fff;display:flex;min-height:calc(100vh - 64px);padding:32px}.home-panel{display:grid;gap:28px;margin:0 auto;max-width:1120px;width:100%}.home-hero{align-items:end;display:grid;gap:24px;grid-template-columns:minmax(0,1fr) minmax(240px,320px)}.home-shell.has-ai-shains{align-items:flex-start;padding:clamp(26px,5vw,68px)}.home-shell.has-ai-shains .home-panel{gap:24px;max-width:1200px}.brand-lockup{align-items:center;color:var(--teal-dark);display:flex;font-size:1rem;font-weight:800;gap:10px}.brand-mark{align-items:center;background:var(--teal-dark);border-radius:8px;color:#f8fbf7;display:inline-flex;height:42px;justify-content:center;width:42px}.brand-mark img{height:36px;object-fit:contain;width:36px}.home-copy{max-width:780px}.home-eyebrow{background:var(--teal-soft);border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow);color:var(--teal-dark);display:inline-flex;font-size:.88rem;font-weight:900;margin-bottom:18px;min-height:32px;padding:5px 10px}.home-copy h1{color:var(--text);font-size:clamp(2.45rem,6.4vw,5.1rem);font-weight:950;line-height:1.04;margin:0}.home-copy p{color:#334155;font-size:1.15rem;line-height:1.8;margin:22px 0 0;max-width:620px}.home-mascot-panel{align-items:center;background:var(--surface);border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow);display:grid;gap:14px;grid-template-columns:82px 1fr;padding:16px}.home-mascot-panel img{background:var(--surface-soft);border:1px solid var(--border);border-radius:8px;height:82px;object-fit:cover;object-position:center top;width:82px}.home-mascot-panel strong,.home-mascot-panel span{display:block}.home-mascot-panel strong{color:var(--text);font-size:1rem;font-weight:900}.home-mascot-panel span{color:var(--muted);font-size:.86rem;font-weight:800;line-height:1.6;margin-top:4px}.problem-form{background:#ffffffeb;border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow),var(--shadow);display:grid;gap:14px;max-width:820px;padding:18px}.problem-form-heading{align-items:center;display:flex;gap:12px;justify-content:space-between}.problem-form label{color:var(--text);font-size:.9rem;font-weight:900}.problem-form-heading span{color:var(--muted);font-size:.82rem;font-weight:800}.problem-form 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var(--border-strong);box-shadow:var(--comic-shadow);color:var(--text)}.app-button-soft{background:#f1f5f9;color:var(--teal-dark)}.app-button-icon{background:#f1f5f9;color:var(--teal-dark);height:40px;padding:0;width:40px}.app-button-md{min-height:52px;padding:0 20px}.app-button-sm{min-height:44px;padding:0 16px}.app-button span{min-width:0}.app-button-spinner{animation:spin .9s linear infinite}.home-shell.is-blocked{align-items:stretch;padding:0}.home-shell.is-blocked .home-panel{max-width:none}.home-blocking-state{align-items:center;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);background:#ffffffdb;display:flex;top:0;right:0;bottom:0;left:0;justify-content:center;padding:32px;position:fixed;text-align:center;z-index:35}.home-blocking-state>div{align-items:center;display:grid;gap:18px;justify-items:center}.home-blocking-state p{color:#334155;font-weight:800;line-height:1.7;margin:0;max-width:620px}.error-action{align-items:start;display:grid;gap:10px}.error-action .error-text{margin:0}.ai-shain-list{display:grid;gap:22px;max-width:100%}.ai-shain-loading{align-items:center;background:#ffffffeb;border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow),var(--shadow);color:#334155;display:flex;font-weight:800;gap:12px;justify-content:center;min-height:180px;padding:24px}.ai-shain-loading svg{animation:spin .9s linear infinite;color:var(--teal);flex:0 0 auto}.ai-shain-loading p{margin:0}.ai-shain-grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.ai-shain-item,.ai-shain-create-card{align-content:space-between;background:#ffffffeb;border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow),0 16px 40px #0f172a14;color:var(--text);min-height:176px;overflow:hidden;position:relative}.ai-shain-create-card{align-content:center;align-items:center;background:var(--yellow);color:var(--text);display:grid;font-weight:950;gap:10px;justify-items:center;padding:20px;text-align:center}.ai-shain-create-card svg{background:#ffffffb3;border:2px solid var(--border-strong);border-radius:8px;box-shadow:2px 2px #0f172a24;height:54px;padding:10px;width:54px}.ai-shain-item>a{color:inherit;display:grid;gap:14px;min-height:176px;padding:20px;text-decoration:none}.ai-shain-item img{background:var(--surface-soft);border:1px solid var(--border);border-radius:8px;height:54px;object-fit:cover;width:54px}.ai-shain-item span,.ai-shain-create-card span{display:-webkit-box;font-size:1.08rem;font-weight:900;line-height:1.55;overflow:hidden;-webkit-box-orient:vertical;-webkit-line-clamp:3}.ai-shain-create-card small{color:#334155;font-size:.84rem;font-weight:800}.ai-shain-status{align-items:center;align-self:end;border-radius:8px;display:inline-flex;font-size:.78rem;font-weight:800;justify-self:end;line-height:1;min-height:28px;padding:0 9px}.ai-shain-status.ready{background:var(--teal-soft);color:var(--teal-dark)}.ai-shain-status.creating{background:var(--yellow);border:1px solid rgba(15,23,42,.16);color:#92400e}.create-modal-backdrop{align-items:center;background:#0e181373;display:flex;top:0;right:0;bottom:0;left:0;justify-content:center;padding:20px;position:fixed;z-index:40}.create-modal{background:var(--page);border-radius:8px;box-shadow:0 28px 80px #08160f47;display:grid;gap:14px;max-width:760px;max-height:calc(100vh - 40px);overflow:auto;padding:18px;width:min(760px,100%)}.create-modal>header{align-items:center;display:flex;gap:16px;justify-content:space-between}.create-modal h2{color:var(--text);font-size:1.25rem;margin:0}.create-modal .problem-form{box-shadow:none;max-width:none}.auth-shell{align-items:center;background:#fff;display:flex;min-height:100vh;padding:28px}.settings-page{background:#fff;min-height:calc(100vh - 64px);padding:clamp(24px,4vw,48px)}.settings-shell{display:grid;gap:18px;margin:0 auto;max-width:960px;width:100%}.settings-heading h1{color:var(--text);font-size:clamp(2rem,4.6vw,3.4rem);line-height:1;margin:0}.settings-tabs{align-items:center;border-bottom:2px solid var(--border-strong);display:flex;gap:8px}.settings-tabs button{background:#fff;border:2px solid transparent;border-bottom:0;border-radius:8px 8px 0 0;color:#475569;font-weight:900;min-height:42px;padding:0 16px}.settings-tabs button.active{background:var(--yellow);border-color:var(--border-strong);color:var(--text)}.settings-panel{display:grid;gap:16px}.settings-panel-header{align-items:start;display:flex;gap:16px;justify-content:space-between}.settings-copy h2{color:var(--text);font-size:1.35rem;margin:0}.settings-copy p{color:var(--muted);font-weight:700;line-height:1.7;margin:8px 0 0}.settings-form{background:#ffffffeb;border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow),0 14px 36px #0f172a14;display:grid;gap:12px;max-width:560px;padding:18px}.settings-form label{color:var(--text);font-size:.88rem;font-weight:800}.settings-form input,.settings-form select{background:#fff;border:1px solid #cbd5e1;border-radius:8px;color:var(--text);min-height:48px;outline:none;padding:0 14px;width:100%}.settings-form input:focus,.settings-form select:focus{border-color:var(--teal);box-shadow:0 0 0 3px #14b8a633}.settings-form button[type=submit],.settings-secondary-button{align-items:center;border-radius:8px;display:inline-flex;font-weight:800;gap:8px;justify-content:center;min-height:44px;padding:0 14px}.settings-form button[type=submit]{background:var(--yellow);border:2px solid 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td:nth-child(3){color:var(--muted);font-weight:800;max-width:420px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.settings-table tbody tr:last-child td{border-bottom:0}.settings-row-actions{display:flex;gap:8px;justify-content:flex-end}.settings-row-actions button,.settings-form-title button{align-items:center;background:#f8fafc;border:1px solid #dbe7e8;border-radius:8px;color:#334155;display:inline-flex;height:34px;justify-content:center;padding:0;width:34px}.settings-drawer-overlay{align-items:stretch;background:#0f172a57;display:flex;top:0;right:0;bottom:0;left:0;justify-content:flex-end;padding:0;position:fixed;z-index:50}.settings-drawer{background:#fff;border-left:2px solid var(--border-strong);box-shadow:-18px 0 48px 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14px;width:100%}.auth-form input:focus{border-color:var(--teal);box-shadow:0 0 0 3px #14b8a633}.auth-form button,.google-button,.workspace-artifact-link,.back-inline{align-items:center;border:0;border-radius:8px;display:inline-flex;font-weight:800;gap:8px;justify-content:center;min-height:44px;padding:0 14px;text-decoration:none}.auth-form button{background:var(--yellow);border:2px solid var(--border-strong);box-shadow:var(--comic-shadow);color:var(--text);min-height:50px}.google-button,.back-inline{background:#f1f5f9;color:var(--teal-dark)}.google-button img{display:block;height:20px;object-fit:contain;width:20px}.auth-divider{align-items:center;color:var(--muted);display:grid;font-size:.86rem;font-weight:800;gap:12px;grid-template-columns:1fr auto 1fr;line-height:1}.auth-divider:before,.auth-divider:after{background:#cbd5e1;content:"";height:1px}.auth-switch a{color:var(--teal);font-weight:800}.chat-shell{background:#fff;display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,360px);grid-template-rows:auto 1fr auto;min-height:calc(100vh - 64px)}.chat-header{align-items:center;background:#fff;border-bottom:2px solid var(--border-strong);display:flex;gap:16px;grid-column:1 / -1;padding:16px clamp(18px,5vw,56px)}.chat-title-block{min-width:0}.back-link{align-items:center;background:var(--yellow);border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow);color:var(--text);display:inline-flex;height:40px;justify-content:center;transform:rotate(-90deg);width:40px}.chat-ai-shain-image-button{background:transparent;border:0;border-radius:8px;flex:0 0 auto;height:52px;padding:0;position:relative;width:52px}.chat-ai-shain-image-button:focus-visible{outline:3px solid rgba(29,125,95,.24);outline-offset:2px}.chat-ai-shain-image-button>svg{animation:spin .9s linear 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minmax(0,1fr)}.message-row.user{align-self:flex-end}.message-content{display:grid;gap:6px;min-width:0}.message-speaker{align-items:center;color:var(--muted);display:inline-flex;font-size:.78rem;font-weight:800;gap:8px;line-height:1}.message-avatar{align-self:end;background:var(--surface-soft);border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow);display:block;height:58px;object-fit:cover;object-position:center top;width:58px}.chat-header h1{color:var(--text);font-size:clamp(1.5rem,2.8vw,2.2rem);font-weight:950;line-height:1.2;margin:0}.chat-title-row{align-items:center;display:flex;gap:8px;min-width:0}.chat-title-row h1{min-width:0;overflow-wrap:anywhere}.chat-title-row button,.chat-title-edit button{align-items:center;background:var(--teal-soft);border:1px solid var(--border);border-radius:8px;color:var(--teal-dark);display:inline-flex;flex:0 0 auto;height:34px;justify-content:center;padding:0;width:34px}.chat-title-edit{align-items:center;display:grid;gap:8px;grid-template-columns:minmax(160px,520px) 34px 34px;max-width:min(680px,100%)}.chat-title-edit input{background:#fff;border:1px solid #cbd5e1;border-radius:8px;color:var(--text);font-size:clamp(1.1rem,2vw,1.55rem);font-weight:800;min-height:42px;min-width:0;outline:none;padding:0 12px;width:100%}.chat-title-edit input:focus{border-color:var(--teal);box-shadow:0 0 0 3px #14b8a633}.chat-title-edit button:disabled svg{animation:spin .9s linear infinite}.understanding-panel{background:#fff;border:2px solid var(--border-strong);border-radius:8px;box-shadow:var(--comic-shadow),0 18px 42px #0f172a1a;align-self:start;grid-column:2;grid-row:2;margin:24px 24px 24px 0;max-height:calc(100vh - 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