:root{--ink:#253c38;--muted:#86908c;--green:#19685c;--green-dark:#125247;--pale:#edf4f0;--line:#e9ede9;--bg:#fafbf9;--sidebar:#f3f5f1;font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button{border:0;background:none}button:disabled{cursor:not-allowed;opacity:.55}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible{outline:3px solid #90c9b9;outline-offset:4px}svg{width:20px;height:20px;display:block;stroke:currentColor;stroke-width:1.65;fill:none;stroke-linecap:round;stroke-linejoin:round}[data-icon]{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}.shell{display:flex;min-height:100dvh}.sidebar{width:242px;position:fixed;inset:0 auto 0 0;background:var(--sidebar);border-right:1px solid #e7ebe5;padding:36px 20px 20px;display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:11px;padding:0 10px;margin-bottom:36px;font-size:25px;font-weight:750;letter-spacing:2px}.brand-icon{background:var(--green);color:white;border-radius:13px;width:42px;height:44px;box-shadow:0 4px 10px #16645a14}.brand-icon svg{width:26px;height:26px}.brand-en{display:block;font-size:8px;letter-spacing:2.7px;font-weight:600;margin-top:1px;color:#617971}.new-chat{width:100%;display:flex;align-items:center;gap:9px;background:white;border:1px solid #d9e4db;border-radius:11px;padding:13px 12px;font-size:13px;font-weight:600;color:var(--green);box-shadow:0 2px 3px #253c3803;margin-bottom:25px}.key{margin-left:auto;color:#8a9d93;font-size:16px;font-weight:400}nav{display:flex;flex-direction:column;gap:6px}.nav-item{width:100%;display:flex;align-items:center;gap:12px;text-align:left;font-size:13px;padding:12px 13px;border-radius:9px;color:#6f7a73}.nav-item.active{background:#e3ede5;color:#195d50;font-weight:650}.nav-item:hover,.recent-item:hover{background:#e9eee8}.tiny-dot{width:5px;height:5px;background:var(--green);border-radius:50%;margin-left:auto}.nav-count{margin-left:auto;font-size:11px;color:#8c9990}.recent-label{margin:36px 13px 13px;color:#939c94;font-size:11px;letter-spacing:.5px}.recent-list{overflow:auto;min-height:45px;flex:1}.recent-empty{font-size:12px;color:#a1aaa1;margin:10px 13px;line-height:1.8}.recent-item{display:flex;align-items:center;gap:9px;font-size:12px;text-align:left;width:100%;padding:11px;border-radius:8px;color:#708077;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.recent-item span:last-child{overflow:hidden;text-overflow:ellipsis}.recent-item svg{width:15px;height:15px}.sidebar-bottom{margin-top:auto;padding-top:16px}.small-note{display:flex;gap:10px;border:1px solid #e0e7df;border-radius:11px;padding:15px 10px;margin-bottom:19px;color:#6b8574}.small-note svg{width:17px;height:17px}.small-note strong{display:block;font-size:11px;font-weight:550;color:#53725f}.small-note p{font-size:10px;margin:6px 0 0;color:#8a978b}.profile{display:flex;align-items:center;width:100%;gap:9px;border-top:1px solid #e1e7df;padding:19px 2px 0;text-align:left;font-size:12px}.avatar{width:33px;height:33px;display:grid;place-items:center;background:#e3eadc;border-radius:50%;color:#668253;font-size:12px}.profile small{display:block;font-size:9px;color:#929d90;margin-top:5px}.profile>span:last-child{margin-left:auto;color:#93a08f}.profile svg{width:16px;height:16px}.main-shell{margin-left:242px;flex:1;min-width:0;display:flex;flex-direction:column;min-height:100dvh}.topbar{display:flex;justify-content:space-between;align-items:center;height:80px;padding:0 40px;flex-shrink:0;background:#fafbf9ed;position:sticky;top:0;z-index:10;backdrop-filter:blur(12px);border-bottom:1px solid #edf0eb}.topbar-left{display:flex;align-items:center;gap:16px}.topbar-title{font-size:14px;font-weight:600}.topbar-subtitle{font-size:11px;color:#96a096}.divider{width:1px;height:13px;background:#dce3db}.preview-badge{display:flex;align-items:center;gap:7px;background:#f0f3ed;border:1px solid #e5ebe1;border-radius:20px;color:#7c8c70;font-size:10px;padding:6px 10px}.preview-badge>span:first-child{width:5px;height:5px;background:#8ea773;border-radius:50%}.preview-badge svg{width:12px;height:12px}#main-content{flex:1;width:100%;max-width:1060px;margin:0 auto;padding:0 50px}.home{padding-top:48px}.hero{position:relative;min-height:298px}.hero-topline{display:flex;align-items:center;gap:8px;color:#7b9485;font-size:12px;letter-spacing:1.6px}.hero-topline svg{width:18px;height:18px}h1{font-size:clamp(30px,3.2vw,44px);line-height:1.45;font-weight:600;letter-spacing:-1px;margin:19px 0 17px;color:#233d36}h1>span{color:var(--green)}.hero-description{font-size:12px;line-height:2.1;color:#899389;margin:0}.hero-art{position:absolute;right:10px;top:12px;width:250px;height:245px}.orbit{position:absolute;border:1px solid #dfe7da;border-radius:50%;width:235px;height:170px;transform:rotate(-35deg);top:35px;left:3px}.orbit-two{transform:rotate(40deg);border-style:dashed;opacity:.8}.orbit-dot{position:absolute;width:9px;height:9px;border-radius:50%;background:#c8d4b9;left:17px;top:165px}.paper{width:120px;height:155px;border-radius:13px;position:absolute;top:35px;left:67px}.paper-back{background:#dfebd9;transform:rotate(14deg);left:83px;top:24px;border:1px solid #d6e2d0}.paper-front{background:linear-gradient(130deg,#fff,#f8fbf5);border:1px solid #dce5d7;box-shadow:0 16px 24px #52735615;transform:rotate(-9deg);padding:20px}.paper-cap{color:#537a65}.paper-cap svg{width:27px;height:27px}.paper-line{height:4px;background:#cbdac9;width:54px;border-radius:2px;margin-top:11px}.paper-line.short{width:36px;margin-top:6px;background:#e3e9dd}.paper-check{display:flex;gap:7px;margin-top:11px;align-items:center;color:#82a18a}.paper-check svg{width:12px;height:12px}.paper-check>span:last-child{height:3px;width:48px;background:#dbe5d5}.paper-check+.paper-check{margin-top:6px}.floating-star{position:absolute;right:22px;top:2px;font-size:33px;color:#d9c796;transform:rotate(10deg)}.art-label{position:absolute;bottom:15px;left:48px;display:flex;gap:6px;align-items:center;background:#fffaf0;color:#988358;border:1px solid #eee6d4;border-radius:8px;box-shadow:0 4px 10px #5c4b1d06;padding:10px 13px;font-size:10px;transform:rotate(-5deg)}.art-label svg{width:14px;height:14px}.section-heading{display:flex;justify-content:space-between;align-items:center;margin:12px 0 16px}.section-heading h2{font-size:13px;font-weight:600;margin:0}.section-heading>span{font-size:10px;color:#99a096}.section-heading>span>span{margin-left:7px}.prompt-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.prompt-card{text-align:left;position:relative;padding:20px 16px 22px;border:1px solid #e3e9df;border-radius:13px;background:#fff;transition:transform .18s,box-shadow .18s,border-color .18s;min-width:0}.prompt-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px #315a3910;border-color:#c2d5c5}.card-icon{width:34px;height:34px;border-radius:10px;margin-bottom:16px}.mint{background:#edf4ee;color:#57836e}.peach{background:#fcf2e7;color:#b48c59}.lavender{background:#f0eff8;color:#9187b0}.card-icon svg{width:18px;height:18px}.card-eyebrow{display:block;font-size:10px;color:#a1aaa0;margin-bottom:9px}.prompt-card strong{display:block;font-size:12px;font-weight:550;line-height:1.6}.prompt-card p{font-size:10px;color:#98a094;margin:9px 0 0;line-height:1.6}.card-arrow{position:absolute;right:16px;top:24px;color:#adb8aa;font-size:15px}.how-it-works{display:flex;justify-content:center;align-items:center;gap:20px;margin:29px 0 22px;color:#9aa394;font-size:10px}.how-it-works span{display:flex;gap:7px;align-items:center}.how-it-works i{font-style:normal;font-size:8px;background:#edf1e8;width:19px;height:19px;display:grid;place-items:center;border-radius:50%;color:#89987f}.how-it-works b{font-weight:400;color:#d2dccb}.composer-area{width:100%;max-width:1060px;margin:0 auto;padding:14px 50px 16px;position:sticky;bottom:0;background:linear-gradient(0deg,var(--bg) 80%,#fafbf900);z-index:5}.composer{padding:16px 18px 13px;border:1px solid #dbe4d6;border-radius:17px;box-shadow:0 4px 24px #43593505;background:#fff;transition:border-color .2s,box-shadow .2s}.composer:focus-within{border-color:#8fb5a0;box-shadow:0 0 0 3px #19685c08}textarea{width:100%;resize:none;border:none;background:transparent;outline:none;font-size:13px;line-height:1.7;color:var(--ink);min-height:46px;max-height:140px}textarea::placeholder{color:#a1aaa0}.composer-bottom{display:flex;justify-content:space-between;align-items:center;margin-top:7px}.composer-label{display:flex;align-items:center;gap:7px;font-size:11px;color:#597a63}.composer-label svg{width:15px;height:15px}.composer-mode{font-size:9px;color:#9da798;margin-left:6px;padding-left:12px;border-left:1px solid #e3e8df}.send-area{display:flex;align-items:center;gap:12px}.send-area>span{font-size:9px;color:#a5aea0}#send-button{background:var(--green);color:white;border-radius:10px;width:33px;height:33px;display:grid;place-items:center}#send-button:hover{background:var(--green-dark)}.footer-note{text-align:center;color:#a2ab9d;font-size:9px;line-height:1.7;margin:11px 0 0}.hidden{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.icon-button{display:grid;place-items:center;width:32px;height:32px;border-radius:7px}.icon-button:hover{background:#eaf0e6}.mobile-menu{display:none}.conversation{padding:32px 0 20px}.user-message{background:#eaf0e6;padding:13px 17px;border-radius:15px 15px 3px 15px;max-width:82%;width:fit-content;margin:0 0 26px auto;font-size:13px;line-height:1.8;white-space:pre-wrap}.assistant-message{margin-bottom:28px}.assistant-heading{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:600;margin-bottom:13px}.assistant-avatar{width:26px;height:26px;background:var(--green);color:white;border-radius:8px;display:grid;place-items:center}.assistant-avatar svg{width:16px;height:16px}.assistant-heading>small{font-size:9px;font-weight:400;color:#9ca596;margin-left:3px}.assistant-copy{font-size:13px;line-height:1.9;margin:0 0 15px;white-space:pre-wrap;color:#617568}.scope-card{display:flex;flex-wrap:wrap;gap:8px;padding:13px 15px;background:#f0f4ec;border:1px solid #e1e9dc;border-radius:10px;margin:12px 0 18px;align-items:center}.scope-card span{font-size:10px;color:#70836b;padding-right:10px;border-right:1px solid #d5e0ce}.scope-card span:last-child{border:none}.scope-card .scope-name{font-weight:600;color:#3e6551}.question-card{background:white;border:1px solid #e3e9df;border-radius:12px;padding:21px;margin:12px 0}.question-top{display:flex;align-items:center;gap:8px;margin-bottom:13px}.question-number{font-size:11px;color:#64795a;font-weight:600;font-variant-numeric:tabular-nums}.question-type{font-size:9px;background:#f3f5ef;color:#8a957f;padding:3px 7px;border-radius:4px}.question-topic{font-size:9px;color:#a0a999}.favorite-button{margin-left:auto;color:#acb7a4;padding:3px}.favorite-button.saved{color:#bb9654}.favorite-button.saved svg{fill:#f6edda}.favorite-button svg{width:17px;height:17px}.question-stem{font-size:13px;line-height:1.9;margin:0 0 16px;font-weight:500;white-space:pre-wrap}.options{display:grid;grid-template-columns:1fr 1fr;gap:9px}.option{display:flex;align-items:flex-start;gap:10px;border:1px solid #e7ece3;border-radius:8px;padding:11px 13px;text-align:left;font-size:11px;line-height:1.7;background:#fff}.option:hover:not(:disabled){background:#f4f8f0;border-color:#a4bba3}.option-letter{color:#929f88;font-size:10px}.option.selected{border-color:#39816a;background:#edf6ef}.option.correct{border-color:#8cb599;background:#edf6ef;color:#2b724f;opacity:1}.option.wrong{border-color:#d7a899;background:#fcf1ed;color:#a86550;opacity:1}.option:disabled{cursor:default;opacity:.8}.answer-line{margin-top:15px;display:flex;align-items:center;justify-content:space-between;font-size:10px;color:#9aa591}.answer-toggle{color:var(--green);font-size:11px;padding:4px 0}.analysis{background:#f4f7f0;border-left:2px solid #aac2a0;padding:12px 14px;font-size:11px;line-height:1.9;margin-top:11px;color:#657a5c}.analysis strong{display:block;color:#41764f;margin-bottom:4px}.result-actions{display:flex;flex-wrap:wrap;gap:9px;margin:18px 0 8px}.secondary-button{border:1px solid #d9e3d2;border-radius:8px;padding:9px 13px;display:inline-flex;gap:7px;align-items:center;font-size:11px;background:white;color:#5d7b53}.secondary-button svg{width:14px;height:14px}.secondary-button:hover{background:#eef4e8}.batch-meta{font-size:10px;color:#97a28f;margin-top:12px;line-height:1.7}.score-line{font-size:11px;color:var(--green);padding:10px 0;font-weight:500}.suggestions{display:flex;flex-wrap:wrap;gap:8px}.suggestions button{border:1px solid #dde7d5;color:#628359;border-radius:20px;padding:8px 13px;font-size:11px;background:white}.library{padding:42px 0}.library h1{font-size:25px;margin:0 0 9px}.library-intro{font-size:12px;color:#94a088;margin-bottom:27px}.empty-state{padding:65px 20px;text-align:center;border:1px dashed #dce6d2;border-radius:14px;color:#92a184;font-size:13px;line-height:2.2}.empty-state .secondary-button{margin-top:17px}.history-card{display:flex;align-items:center;gap:16px;width:100%;padding:20px;border:1px solid var(--line);background:white;border-radius:12px;margin:12px 0;text-align:left}.history-card>span:first-child{background:#eef4e8;padding:12px;border-radius:10px;color:#6a845e}.history-card strong{display:block;font-size:13px;font-weight:500;margin-bottom:7px}.history-card small{font-size:10px;color:#9aa68f}.history-card>span:last-child{margin-left:auto;color:#829575}.toast{position:fixed;bottom:35px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;z-index:90;background:#284a3c;color:white;padding:12px 20px;border-radius:10px;box-shadow:0 5px 25px #0002;font-size:12px;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}dialog{border:1px solid #e1e8da;border-radius:20px;padding:34px;max-width:470px;width:calc(100% - 32px);box-shadow:0 30px 100px #16332630;color:var(--ink)}dialog::backdrop{background:#1b32263d;backdrop-filter:blur(4px)}.dialog-close.icon-button{position:absolute;right:14px;top:14px;font-size:23px;color:#899a7d}.dialog-mark{width:42px;height:42px;border-radius:12px;background:#edf4e6;color:var(--green)}dialog h2{font-size:22px;font-weight:600;margin:20px 0 12px}dialog p{font-size:12px;color:#839178;line-height:1.9}.dialog-detail{padding:17px;background:#f5f7f1;border-radius:10px;margin:20px 0}.dialog-detail strong{font-size:12px}.dialog-detail p{font-size:11px;margin:5px 0 16px}.dialog-detail p:last-child{margin-bottom:0}.primary-button{display:flex;justify-content:space-between;align-items:center;background:var(--green);color:white;border-radius:9px;padding:12px 16px;width:100%;font-size:12px}.print-document{display:none}
@media(min-width:1500px){.home{padding-top:70px}.hero{min-height:330px}.prompt-card{padding:24px 20px}.composer-area{padding-bottom:25px}.hero-art{right:50px;transform:scale(1.12);top:20px}}
@media(max-width:1150px){.sidebar{width:210px;padding-left:15px;padding-right:15px}.main-shell{margin-left:210px}#main-content{padding:0 30px}.composer-area{padding-left:30px;padding-right:30px}.topbar{padding:0 30px}.hero-art{right:-15px;transform:scale(.85);transform-origin:right top}.hero-description{font-size:11px}.prompt-card strong{font-size:11px}.prompt-card p{font-size:9px}.prompt-grid{gap:10px}.prompt-card{padding-left:12px;padding-right:12px}}
@media(max-width:900px){.hero-art{opacity:.75;transform:scale(.7);right:-10px;top:30px}.hero h1{font-size:32px}.hero-description{max-width:290px}.prompt-grid{grid-template-columns:1fr}.prompt-card{padding:16px 14px 16px 66px;min-height:104px}.card-icon{position:absolute;left:16px;top:19px}.card-eyebrow{margin-bottom:5px}.prompt-card strong{font-size:12px}.prompt-card p{font-size:10px;margin-top:4px}.card-arrow{top:44px}.home{padding-top:34px}.hero{min-height:280px}.how-it-works{gap:10px;font-size:9px}.topbar-subtitle,.topbar .divider{display:none}.options{grid-template-columns:1fr}}
@media(max-width:640px){.sidebar{transform:translateX(-100%);transition:transform .2s;box-shadow:10px 0 40px #24392115}.sidebar.open{transform:translateX(0)}.main-shell{margin-left:0}.topbar{height:64px;padding:0 18px}.mobile-menu{display:grid}.topbar-left{gap:10px}.topbar-title{font-size:13px}#main-content{padding:0 22px}.home{padding-top:32px}.hero{min-height:265px}.hero h1{font-size:31px}.hero-topline{font-size:10px}.hero-description{font-size:11px;max-width:230px}.hero-art{transform:scale(.48);top:62px;right:-12px;opacity:.8}.hero-description br{display:none}.hero-description{max-width:210px}.section-heading>span{font-size:9px}.composer-area{padding:12px 14px 11px}.composer{padding:13px 14px 10px;border-radius:14px}textarea{font-size:12px}.footer-note{font-size:8px;padding:0 7px}.send-area>span{display:none}.how-it-works{margin:24px 0 12px;gap:8px}.how-it-works b{display:none}.conversation{padding-top:24px}.question-card{padding:16px}.question-stem{font-size:13px}.scope-card{gap:8px}.scope-card span{font-size:9px}.topbar .preview-badge{font-size:9px}.question-topic{max-width:120px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.library{padding-top:28px}.toast{width:max-content;max-width:85vw;text-align:center}.profile small{font-size:9px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{body{background:white}.shell,.toast,dialog{display:none!important}.print-document{display:block;color:black;font-size:12pt}.print-document h1{font-size:20pt;color:black}.print-document h2{font-size:15pt}.print-question{break-inside:avoid;margin:18px 0}.print-answer-section{break-before:page}.print-note{font-size:9pt;color:#666}}

.user-message,.assistant-message{scroll-margin-top:100px}
@media(max-width:640px){.user-message,.assistant-message{scroll-margin-top:80px}}