:root{--paper: #faf9f7;--ink: #1c1b1a;--muted: #6b6862;--line: #e4e1dc;--accent: #2f5d50;--accent-soft: #e8efec;--warn: #a35a1f;--card: #ffffff;--radius: 12px}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.65 -apple-system,BlinkMacSystemFont,PingFang SC,Noto Sans CJK SC,sans-serif;padding-bottom:env(safe-area-inset-bottom)}button,input,textarea,select{font:inherit;color:inherit}.app{max-width:760px;margin:0 auto;min-height:100%;display:flex;flex-direction:column}.header{position:sticky;top:0;z-index:5;background:#faf9f7f0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);padding:calc(10px + env(safe-area-inset-top)) 16px 10px;display:flex;align-items:center;gap:10px}.header h1{font-size:16px;margin:0;flex:1;letter-spacing:.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.main{flex:1;padding:14px 16px 90px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px;margin-bottom:12px}.card h2{font-size:13px;color:var(--muted);font-weight:600;letter-spacing:.04em;margin:0 0 10px}.muted{color:var(--muted)}.small{font-size:12px}.pill{display:inline-block;font-size:11px;border:1px solid var(--line);border-radius:999px;padding:2px 8px;color:var(--muted)}.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:10px}.btn{min-height:44px;padding:0 16px;border-radius:10px;border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer}.btn.ghost{background:#fff;color:var(--accent)}.btn.small{min-height:34px;font-size:13px;padding:0 10px}.btn.block{width:100%}.btn:disabled{opacity:.5}.input,.textarea,select{width:100%;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:16px}.textarea{min-height:96px;resize:vertical}.label{display:block;font-size:12px;color:var(--muted);margin:8px 0 4px}.nav{position:fixed;bottom:0;left:0;right:0;background:#faf9f7f5;border-top:1px solid var(--line);display:flex;justify-content:space-around;padding:6px 8px calc(6px + env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.nav button{background:none;border:0;color:var(--muted);font-size:12px;padding:6px 10px}.nav button.active{color:var(--accent);font-weight:600}.nav button svg{display:block;margin:0 auto 2px}.session{max-width:760px;margin:0 auto;padding:14px 16px 40px}.session-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}.session-head .step{margin-left:auto;font-size:12px;color:var(--muted)}.bubble{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px;margin-bottom:12px}.bubble .who{font-size:12px;color:var(--muted);margin-bottom:6px}.bubble p{margin:0 0 8px}.serif{font-family:Songti SC,"Source Han Serif SC","Noto Serif CJK SC",serif}.holding{margin:8px 0 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10px}.center{text-align:center}.mt{margin-top:12px}.hidden{display:none}.actions{position:sticky;bottom:0;background:var(--paper);padding-top:8px;padding-bottom:calc(8px + env(safe-area-inset-bottom))}.reader{max-width:760px;margin:0 auto;padding:10px 16px calc(96px + env(safe-area-inset-bottom))}.reader h2{font-size:15px;color:var(--muted);font-weight:600;margin:6px 0 14px}.reader-content p{margin:0 0 14px;font-family:Songti SC,"Source Han Serif SC",serif;font-size:17px;line-height:1.9}.selection-bar{position:fixed;left:0;right:0;bottom:0;z-index:30;background:#faf9f7fa;border-top:1px solid var(--line);padding:8px 12px calc(8px + env(safe-area-inset-bottom));display:flex;gap:8px;overflow-x:auto}.sheet{position:fixed;left:0;right:0;bottom:0;z-index:40;background:var(--paper);border-top:1px solid var(--line);border-radius:16px 16px 0 0;box-shadow:0 -8px 30px #00000014;padding:14px 16px calc(14px + env(safe-area-inset-bottom));max-height:75vh;overflow-y:auto}.sheet-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}.sheet-head strong{flex:1}.msgs{max-height:42vh;overflow-y:auto}.msg{margin:8px 0;padding:10px 12px;border-radius:10px;background:#fff;border:1px solid var(--line);white-space:pre-wrap;font-size:14px}.msg.user{background:var(--accent-soft);border-color:transparent}.quote{font-family:Songti SC,serif;background:#fff;border-left:3px solid var(--accent);padding:8px 10px;margin:8px 0;font-size:14px}.reader.has-bar{padding-bottom:calc(160px + env(safe-area-inset-bottom))}.seg{gap:6px;flex-wrap:nowrap;overflow-x:auto;margin-bottom:12px}.seg button{border:1px solid var(--line);background:#fff;color:var(--accent);border-radius:999px;min-height:34px;padding:0 12px;font-size:13px}.seg button.active{background:var(--accent);color:#fff;border-color:var(--accent)}.offline-banner{background:#fff4e5;color:#8a4b12;border-bottom:1px solid #f0dcc2;padding:6px 16px;font-size:13px;text-align:center}.assistant-fab{position:fixed;right:16px;bottom:calc(86px + env(safe-area-inset-bottom));z-index:25;width:52px;height:52px;border-radius:50%;background:var(--accent);color:#fff;border:none;font-size:15px;box-shadow:0 6px 20px #0000002e}.assistant-sheet{z-index:60}.graph-canvas{position:relative;height:52vh;min-height:320px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff;margin-bottom:12px}.graph-canvas svg{width:100%;height:100%;touch-action:none;display:block}.graph-tools{position:absolute;right:8px;top:8px;display:flex;gap:6px}.graph-hint{position:absolute;left:10px;bottom:8px;font-size:11px;color:var(--muted)}.src-chip{border:1px solid var(--line);background:#fff;color:var(--accent);border-radius:999px;padding:4px 10px;font-size:12px;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.angle-card{display:flex;flex-direction:column;gap:2px;width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:10px;padding:10px 12px;margin-top:8px}.angle-card strong{font-size:14px;color:var(--accent)}.assistant-window{position:fixed;z-index:60;display:flex;flex-direction:column;background:#faf9f7f7;border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 60px #0000002e;overflow:hidden;max-width:calc(100vw - 16px);max-height:calc(100vh - 16px)}.assistant-head{display:flex;align-items:center;gap:6px;padding:8px 10px;background:#faf9f7b8;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);cursor:move;touch-action:none}.assistant-head .btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}.assistant-body{flex:1;overflow-y:auto;padding:12px}.assistant-foot{padding:8px 10px calc(8px + env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--paper)}.assistant-resize{position:absolute;right:0;bottom:0;width:18px;height:18px;cursor:nwse-resize}.assistant-window.mobile{left:0!important;right:0;top:auto!important;bottom:0;width:auto!important;height:72vh!important;border-radius:16px 16px 0 0;max-width:100vw}.assistant-pill{position:fixed;right:16px;bottom:calc(86px + env(safe-area-inset-bottom));z-index:25;border:1px solid var(--line);background:var(--paper);color:var(--accent);border-radius:999px;padding:10px 14px;box-shadow:0 6px 20px #0000001f}.reader-content p.hl{background:#fff3cd;box-shadow:0 0 0 6px #fff3cd;border-radius:3px}.reader-bar{position:fixed;left:0;right:0;bottom:0;z-index:28;display:flex;justify-content:space-around;gap:2px;background:#faf9f7f7;border-top:1px solid var(--line);padding:6px 8px calc(6px + env(safe-area-inset-bottom))}.reader-bar button{border:none;background:transparent;color:var(--accent);font-size:13px;padding:8px 10px;min-height:40px}.reader-bar button:disabled{color:var(--line)}.toc-item{display:flex;justify-content:space-between;width:100%;text-align:left;border:none;background:transparent;padding:10px 4px;border-bottom:1px solid var(--line)}.immersive-exit{position:fixed;right:12px;top:calc(10px + env(safe-area-inset-top));z-index:40;border:1px solid var(--line);background:#faf9f7e6;border-radius:999px;padding:6px 12px;font-size:12px;color:var(--muted)}.assistant-shell{display:flex;flex:1;min-height:0}.assistant-main{display:flex;flex-direction:column;flex:1;min-width:0;min-height:0}.assistant-side{width:196px;flex-shrink:0;border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;background:#fbfaf8}.assistant-side-head{display:flex;align-items:center;gap:4px;padding:8px;border-bottom:1px solid var(--line)}.assistant-side-head strong{flex:1;font-size:13px}.assistant-side-list{overflow-y:auto;padding:6px}.assistant-thread{position:relative;border-radius:8px;padding:7px 8px;cursor:pointer;border:1px solid transparent;margin-bottom:4px}.assistant-thread:hover{background:#fff;border-color:var(--line)}.assistant-thread.active{background:#fff;border-color:var(--accent)}.assistant-thread-title{font-size:12px;line-height:1.35;padding-right:18px;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.assistant-thread-del{position:absolute;right:2px;top:2px;padding:0 4px!important;min-height:18px;opacity:0}.assistant-thread:hover .assistant-thread-del{opacity:1}.assistant-foot textarea.input{min-height:44px;max-height:120px;resize:none;line-height:1.45}.assistant-window.mobile{height:auto;max-height:calc(100dvh - 8px)}.assistant-window.mobile .assistant-side{position:absolute;inset:0;width:100%;z-index:8;border-right:0;border-radius:16px 16px 0 0}.planner-screen{height:100dvh;overflow:hidden}.planner-page-main{display:flex;min-height:0;padding-bottom:10px}.planner-chat{display:flex;flex:1;min-height:0;height:100%;background:var(--paper);border-radius:12px;overflow:hidden;position:relative}.planner-side{width:210px;flex-shrink:0;border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;background:#fbfaf8}.planner-side-head{display:flex;align-items:center;padding:10px;border-bottom:1px solid var(--line);gap:6px}.planner-side-head strong{flex:1;font-size:13px}.planner-side-list{overflow-y:auto;padding:6px}.planner-session{position:relative;padding:8px;border-radius:8px;border:1px solid transparent;cursor:pointer;margin-bottom:4px}.planner-session:hover{background:#fff;border-color:var(--line)}.planner-session.active{background:#fff;border-color:var(--accent)}.planner-session-title{font-size:13px;font-weight:600;padding-right:22px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.planner-session-del{position:absolute;right:2px;top:4px;padding:0 4px!important;min-height:20px;opacity:0}.planner-session:hover .planner-session-del{opacity:1}.planner-main{display:flex;flex-direction:column;min-width:0;min-height:0}.planner-msgs{flex:1;min-height:0;max-height:none;overflow-y:auto;padding:10px 4px}.planner-draft{max-height:46%;overflow-y:auto;border-top:1px solid var(--line);padding:8px 4px}.planner-compose{border-top:1px solid var(--line);padding:8px 4px calc(8px + env(safe-area-inset-bottom));background:var(--paper)}.planner-input{min-height:48px;resize:none;line-height:1.5}.planner-mobile-bar{display:none;gap:6px;padding:6px 4px;border-bottom:1px solid var(--line)}@media(max-width:720px){.planner-side{position:absolute;inset:0;width:100%;z-index:10;display:none}.planner-chat.show-history .planner-side,.planner-mobile-bar{display:flex}.planner-chat{border-radius:0}.planner-draft{max-height:42%}}.tutor-head{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin:4px 0 8px}.tutor-thread{display:flex;flex-direction:column;gap:10px;padding-bottom:6px}.tutor-open .btn{margin-top:10px}.session-compose{position:sticky;bottom:0;z-index:5;background:#faf9f7f7;border-top:1px solid var(--line);padding:10px 0 calc(10px + env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.session-compose textarea.input{min-height:48px}.session .assistant-fab{display:none}.cloud-banner{display:flex;align-items:center;gap:8px;margin:0 16px 8px;padding:8px 10px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:12px;color:var(--muted)}.cloud-banner span{flex:1}