:root{--ink:#171711;--muted:#6d6b61;--paper:#f4f1e8;--panel:rgba(255,255,255,0.72);--line:rgba(23,23,17,0.14);--accent:#ff5c35;--accent-dark:#b33519;--sun:#ffd84d;--shadow:0 24px 70px rgba(48,43,31,0.1)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(circle at 10% 0,rgba(255,216,77,.38),transparent 30rem),radial-gradient(circle at 95% 20%,rgba(255,92,53,.14),transparent 28rem),var(--paper);font-family:PingFang SC,Microsoft YaHei,Noto Sans CJK SC,system-ui,sans-serif;min-height:100vh}button,input,textarea{font:inherit}button{color:inherit}.shell{width:min(1180px,calc(100% - 40px));margin:0 auto;padding-bottom:40px}.brandBar{min-height:78px;display:flex;justify-content:space-between;border-bottom:1px solid var(--line)}.brand,.brandBar{align-items:center}.brand{color:var(--ink);text-decoration:none;display:inline-flex;gap:10px;font-size:20px;font-weight:800;letter-spacing:-.03em}.brandMark{width:34px;height:34px;display:grid;place-items:center;border-radius:10px;background:var(--ink);color:var(--sun);transform:rotate(-4deg)}.stagePill{padding:8px 13px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:13px;background:rgba(255,255,255,.35)}.hero{padding:78px 0 50px;max-width:850px}.eyebrow{margin:0 0 18px;color:var(--accent-dark);font-size:14px;font-weight:750;letter-spacing:.08em}.hero h1{margin:0;font-size:clamp(42px,6vw,76px);line-height:1.08;letter-spacing:-.065em;font-weight:850}.heroText{max-width:670px;margin:28px 0 0;color:var(--muted);font-size:17px;line-height:1.8}.workspace{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:18px;align-items:stretch}.inputPanel,.resultPanel{min-height:570px;padding:28px;border:1px solid var(--line);border-radius:28px;background:var(--panel);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.inputPanel{display:flex;flex-direction:column}.resultPanel{position:relative;overflow:hidden}.resultPanel:after{content:"";position:absolute;width:190px;height:190px;right:-80px;bottom:-95px;border-radius:50%;background:var(--sun);opacity:.35;pointer-events:none}.blockTitle,.panelHeading{display:flex;align-items:center;justify-content:space-between;gap:16px}.panelHeading>div{display:flex;align-items:center;gap:11px}.panelHeading h2{margin:0;font-size:19px;letter-spacing:-.03em}.step{color:var(--accent-dark);font-weight:800;font-size:12px}.counter{color:var(--muted);font-size:12px}.requirements textarea,.viewpointInput{width:100%;border:0;outline:0;resize:none;color:var(--ink);background:transparent}.viewpointInput{flex:1 1;min-height:280px;margin:24px 0 16px;font-size:21px;line-height:1.75}input::placeholder,textarea::placeholder{color:#716d62}:where(button,a,summary,textarea,input):focus-visible{outline:2px solid var(--accent-dark);outline-offset:4px;border-radius:4px}.requirements textarea:focus-visible,.viewpointInput:focus-visible{outline:2px solid var(--accent-dark)}.requirements{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:0}.requirements summary{min-height:44px;padding:13px 0;cursor:pointer;list-style:none;font-size:14px;font-weight:700}.requirements summary::-webkit-details-marker{display:none}.requirements summary:after{content:"+";float:right;color:var(--accent-dark)}.requirements[open] summary:after{content:"−"}.requirements summary span{margin-left:6px;color:var(--muted);font-weight:400}.requirements textarea{min-height:95px;margin-top:16px;line-height:1.65}.generateButton{width:100%;min-height:56px;margin-top:22px;border:0;border-radius:17px;padding:0 22px;display:flex;align-items:center;justify-content:center;gap:10px;background:var(--ink);color:white;font-weight:750;cursor:pointer;transition:transform .16s ease,background .16s ease}.generateButton:hover:not(:disabled){transform:translateY(-2px);background:#2c2b22}.generateButton:disabled{cursor:not-allowed;opacity:.45}.clearButton{min-height:44px;margin-top:4px;padding:8px 12px;border:0;border-radius:10px;background:transparent;color:var(--muted);font-size:13px;cursor:pointer}.clearButton:hover:not(:disabled){color:var(--ink);background:rgba(23,23,17,.04)}.clearButton:disabled{opacity:.45;cursor:not-allowed}.privacyNote{margin:12px 0 0;color:var(--muted);font-size:12px;line-height:1.7}.errorMessage{margin:14px 0 0;color:#a62e16;font-size:13px;line-height:1.5}.spinner{width:15px;height:15px;border:2px solid rgba(255,255,255,.32);border-top-color:white;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.emptyState,.loadingState{min-height:470px;display:grid;align-content:center;justify-items:center;text-align:center;color:var(--muted);position:relative;z-index:1}.emptyGlyph{width:62px;height:62px;margin-bottom:18px;display:grid;place-items:center;border-radius:20px;background:var(--sun);color:var(--ink);font-size:24px;transform:rotate(5deg)}.emptyState p,.loadingState p{line-height:1.8}.loadingState small{color:var(--muted)}.thinkingLine{display:flex;gap:7px;margin-bottom:14px}.thinkingLine span{width:9px;height:9px;border-radius:50%;background:var(--accent);animation:pulse 1.2s ease-in-out infinite}.thinkingLine span:nth-child(2){animation-delay:.15s}.thinkingLine span:nth-child(3){animation-delay:.3s}@keyframes pulse{0%,70%,to{opacity:.25;transform:translateY(0)}35%{opacity:1;transform:translateY(-5px)}}.resultContent{margin-top:24px;position:relative;z-index:1}.resultBlock{padding:22px 0;border-top:1px solid var(--line)}.resultBlock:first-child{border-top:0;padding-top:0}.blockTitle h3{margin:0;font-size:14px;letter-spacing:.02em}.blockTitle button,.copyAll{min-height:44px;flex-shrink:0;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.65);padding:7px 12px;color:var(--muted);cursor:pointer;font-size:12px}.blockTitle button:hover,.copyAll:hover{border-color:var(--ink);color:var(--ink)}.resultBlock p{margin:15px 0 0;white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;line-height:1.9}.draftBlock p{font-size:17px}.factBoundary{margin-top:12px;padding:17px 18px;border-left:3px solid var(--accent);border-radius:6px 14px 14px 6px;background:rgba(255,92,53,.07)}.factBoundary span{color:var(--accent-dark);font-size:12px;font-weight:800}.factBoundary p{margin:7px 0 0;color:#5b554d;font-size:13px;line-height:1.7}footer{padding:28px 4px 0;color:var(--muted);font-size:12px;text-align:center}.aiLabel,.inputHint,.resultNotice{color:var(--muted);font-size:12px;line-height:1.7}.inputHint{margin:0 0 12px}.resultNotice:empty{display:none}.aiLabel{color:var(--accent-dark)}.inviteField{margin-top:22px;font-size:14px}.inviteField input{display:block;width:100%;min-height:44px;margin:8px 0;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:white}.inviteField small{color:var(--muted)}.usageNotice{max-width:800px;margin:0 auto;line-height:1.8}.usageNotice summary{min-height:44px;padding:10px;cursor:pointer}.usageNotice p{text-align:left}.usageNotice a{color:var(--accent-dark);overflow-wrap:anywhere}.srOnly{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media (max-width:820px){.shell{width:min(100% - 24px,680px)}.hero{padding:54px 0 35px}.hero h1{font-size:clamp(38px,11vw,60px)}.heroText{font-size:15px}.workspace{grid-template-columns:1fr}.inputPanel,.resultPanel{min-height:520px;border-radius:22px;padding:22px}.viewpointInput{min-height:250px;font-size:18px}}@media (max-width:480px){.stagePill{display:none}.brandBar{min-height:66px}.hero{padding-top:30px}.hero h1{letter-spacing:-.055em;font-size:38px}.viewpointInput{min-height:200px}.inputPanel,.resultPanel{padding:19px}}@media (prefers-reduced-motion:reduce){*,:after,:before{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}