:root{--bg:#f7f8fc;--panel:#fff;--text:#202124;--muted:#70757d;--line:#e6e8ee;--accent:#5278f5;--soft:#edf1ff;--shadow:0 8px 30px #1e2c4b0c}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.app{display:flex;height:100dvh;min-height:520px}.sidebar{width:260px;background:#f0f2f8;padding:22px 14px 14px;display:flex;flex-direction:column;gap:22px;flex-shrink:0}.brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:750;padding:0 12px}.spark,.hello{color:#5278f5}.spark{font-size:27px}.new-chat{border:0;background:#e2e7f4;border-radius:14px;padding:13px 16px;text-align:left;font-size:15px;display:flex;gap:10px;align-items:center;cursor:pointer;width:100%}nav{display:grid;gap:5px}.nav-item{border:0;background:transparent;padding:12px 14px;border-radius:12px;text-align:left;font-size:15px;color:#4f5665;cursor:pointer;display:flex;gap:13px;align-items:center}.nav-item.active,.nav-item:hover{background:#dfe6fb;color:#233e9b}.side-label{font-size:11px;letter-spacing:1.4px;color:#9297a3;padding:0 12px;margin-bottom:-14px}.recent{display:grid;gap:4px}.recent button{border:0;background:transparent;text-align:left;padding:10px 12px;border-radius:10px;color:#646b78;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.side-bottom{margin-top:auto;display:flex;gap:10px;align-items:center;padding:12px 8px;border-top:1px solid #dfe2ea}.avatar{width:34px;height:34px;border-radius:50%;background:#dce5ff;color:#3f5ac4;display:grid;place-items:center;font-weight:700}.side-bottom small{display:block;color:var(--muted);font-size:11px;margin-top:3px}.side-bottom #themeBtn{margin-left:auto;border:0;background:transparent;font-size:20px;cursor:pointer}.main{flex:1;min-width:0;display:flex;flex-direction:column;position:relative;background:var(--bg)}header{height:66px;display:flex;align-items:center;padding:0 30px;gap:12px}.top-title{font-weight:700;font-size:17px}.top-title span{font-size:11px;color:#5874d7;background:var(--soft);padding:4px 7px;border-radius:7px;margin-left:6px}.upgrade{margin-left:auto;border:1px solid var(--line);background:var(--panel);padding:8px 14px;border-radius:10px;cursor:pointer}.mobile-menu{display:none;border:0;background:transparent;font-size:20px}.welcome{width:min(790px,calc(100% - 36px));margin:auto auto 12px;text-align:center;padding-top:24px}.hello{font-size:42px;margin-bottom:6px}.welcome h1{font-size:clamp(28px,4vw,42px);letter-spacing:-1.5px;margin:5px 0 12px;font-weight:650}.welcome p{color:var(--muted);margin:0 0 30px;font-size:15px}.suggestions{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.suggestions button{border:1px solid var(--line);background:var(--panel);border-radius:17px;padding:17px 14px;text-align:left;display:flex;flex-direction:column;gap:8px;min-height:122px;cursor:pointer;color:var(--accent);box-shadow:var(--shadow)}.suggestions b{font-size:13px;color:var(--text)}.suggestions small{font-size:12px;color:var(--muted);line-height:1.4}.conversation{width:min(790px,calc(100% - 36px));margin:0 auto;flex:1;overflow:auto;display:flex;flex-direction:column;gap:20px;padding:12px 0 20px}.message{display:flex;gap:12px;align-items:flex-start;line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere}.message.user{justify-content:flex-end}.message .bubble{max-width:86%;padding:14px 17px;border-radius:18px;background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow)}.message.user .bubble{background:var(--soft);border-color:transparent}.message .role{font-size:12px;color:var(--muted);margin-bottom:5px;font-weight:700}.message .body{font-size:15px}.composer-wrap{width:min(790px,calc(100% - 36px));margin:0 auto 15px}.composer{display:flex;align-items:flex-end;gap:8px;background:var(--panel);border:1px solid #dfe2e9;border-radius:24px;padding:11px 12px;box-shadow:0 8px 35px #25345612}.composer textarea{flex:1;resize:none;max-height:160px;border:0;outline:0;background:transparent;color:var(--text);font:inherit;font-size:15px;line-height:1.5;padding:8px 2px}.tool-btn,.send-btn{width:38px;height:38px;border:0;border-radius:50%;display:grid;place-items:center;flex-shrink:0;cursor:pointer;font-size:19px;background:transparent;color:var(--muted)}.tool-btn:hover{background:var(--soft)}.send-btn{background:var(--accent);color:white;font-size:23px}.composer-note{text-align:center;color:#969ba6;font-size:11px;margin:10px 4px 0}.attachment-preview{font-size:12px;color:var(--muted);padding:0 12px 8px}.modal{position:fixed;inset:0;background:#11182770;display:grid;place-items:center;padding:20px;z-index:10}.modal.hidden{display:none}.modal-card{max-width:440px;width:100%;background:var(--panel);padding:28px;border-radius:20px;position:relative;box-shadow:0 20px 80px #0003}.modal-card p{color:var(--muted);line-height:1.6;font-size:14px}.close{position:absolute;right:16px;top:12px;font-size:25px;border:0;background:transparent;cursor:pointer}.primary{border:0;background:var(--accent);color:white;border-radius:10px;padding:10px 16px;cursor:pointer}body.dark{--bg:#10131a;--panel:#1a1e28;--text:#edf0f7;--muted:#a2a8b6;--line:#303644;--soft:#252f4e;--shadow:0 8px 30px #0002}body.dark .sidebar{background:#151923}body.dark .new-chat{background:#252b39}body.dark .nav-item.active,body.dark .nav-item:hover{background:#252f4e;color:#c9d5ff}body.dark .side-bottom{border-color:#303644}body.dark .top-title span{background:#252f4e}body.dark .composer{border-color:#303644}@media(max-width:800px){.sidebar{position:fixed;z-index:5;left:-280px;top:0;bottom:0;transition:left .2s;box-shadow:var(--shadow)}.sidebar.open{left:0}.mobile-menu{display:block}header{padding:0 15px}.welcome{padding-top:10px}.suggestions{grid-template-columns:repeat(2,1fr)}.suggestions button{min-height:105px}.conversation,.composer-wrap{width:calc(100% - 24px)}.welcome{width:calc(100% - 24px)}.welcome p{font-size:13px}.message .bubble{max-width:92%}}