*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:Segoe UI,system-ui,-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text)}html[data-theme=dark]{color-scheme:dark}html[data-theme=light]{color-scheme:light}:root{--bg: #ffffff;--bg-sidebar: #f7f7f8;--bg-hover: #e9e9eb;--bg-input: #f4f4f5;--accent: #10a37f;--accent-hover: #0d8a6a;--text: #0d0d0d;--text-secondary: #6e6e6e;--border: #e3e3e8;--modal-bg: #ffffff;--shadow: 0 8px 30px rgba(0, 0, 0, .18);--danger: #e5484d;--danger-hover: #c73c41}html[data-theme=dark]{--bg: #212121;--bg-sidebar: #171717;--bg-hover: #2f2f2f;--bg-input: #2f2f2f;--accent: #10a37f;--accent-hover: #12b488;--text: #ececec;--text-secondary: #9b9b9b;--border: #3f3f3f;--modal-bg: #2f2f2f;--shadow: 0 8px 30px rgba(0, 0, 0, .5)}.layout{display:flex;height:100vh;overflow:hidden}.sidebar{width:264px;flex-shrink:0;background:var(--bg-sidebar);border-right:1px solid var(--border);display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:10px;padding:16px 14px 8px}.brand-logo{width:34px;height:34px;border-radius:10px;object-fit:cover;flex-shrink:0}.brand-name{font-size:16px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.new-chat-btn{margin:12px;padding:10px 14px;border:1px solid var(--border);background:transparent;color:var(--text);border-radius:10px;cursor:pointer;font-size:14px;display:flex;align-items:center;justify-content:center;gap:8px;transition:background .15s}.new-chat-btn:hover{background:var(--bg-hover)}.conv-list{flex:1;overflow-y:auto;padding:0 8px}.conv-item{display:flex;align-items:center;gap:6px;padding:10px 12px;border-radius:8px;cursor:pointer;color:var(--text);margin-bottom:2px;transition:background 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var(--border);display:block;cursor:zoom-in}.preview-remove{position:absolute;top:-7px;right:-7px;width:18px;height:18px;border-radius:50%;background:var(--danger);color:#fff;border:none;cursor:pointer;font-size:10px;line-height:1;display:flex;align-items:center;justify-content:center;transition:background .15s}.preview-remove:hover{background:var(--danger-hover)}textarea{flex:1;border:none;outline:none;background:transparent;color:var(--text);resize:none;font:inherit;line-height:1.6;max-height:200px;font-size:15px;align-self:center;padding:0}.send-btn{width:38px;height:38px;border-radius:50%;background:var(--accent);color:#fff;border:none;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:background .15s,opacity 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3px;border-radius:50%;line-height:1}.model-tag-remove:hover{color:#fff;background:var(--danger)}.fetch-overlay{z-index:120}.fetch-modal{width:420px}.fetch-count{font-size:13px;color:var(--text-secondary);margin-bottom:10px}.fetch-list{max-height:320px;overflow-y:auto;border:1px solid var(--border);border-radius:8px;padding:6px}.fetch-item{display:flex;align-items:center;gap:9px;padding:7px 9px;border-radius:7px;font-size:13px;cursor:pointer;transition:background .15s}.fetch-item:hover{background:var(--bg-hover)}.fetch-item input{accent-color:var(--accent);flex-shrink:0}.fetch-item-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.modal-footer .mini-btn{padding:9px 16px}.model-picker{position:relative;flex-shrink:0}.picker-btn{display:flex;align-items:center;gap:5px;max-width:240px;border:1px solid transparent;background:transparent;color:var(--text-secondary);padding:6px 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2px}.picker-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;font-size:13px;color:var(--text);cursor:pointer;transition:background .15s}.picker-item:hover{background:var(--bg-hover)}.picker-item.selected{color:var(--accent);font-weight:600}.picker-check{width:16px;flex-shrink:0;text-align:center}.picker-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.picker-val{font-size:11px;color:var(--text-secondary);font-weight:400;font-family:Consolas,monospace}.field{display:block;font-size:13px;color:var(--text-secondary);margin-bottom:14px}.field input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg-input);color:var(--text);font-size:14px;outline:none;margin-top:6px;transition:border-color .15s}.field input:focus{border-color:var(--accent)}.modal-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 24px 20px;border-top:1px solid var(--border)}.primary-btn{background:var(--accent);color:#fff;border:none;padding:10px 26px;border-radius:10px;cursor:pointer;font-size:14px;transition:background .15s}.primary-btn:hover{background:var(--accent-hover)}.danger-btn{background:transparent;border:1px solid var(--danger);color:var(--danger);padding:10px 16px;border-radius:10px;cursor:pointer;font-size:13px;transition:background .15s,color .15s}.danger-btn:hover{background:var(--danger);color:#fff}#toast{position:fixed;bottom:100px;left:50%;transform:translate(-50%);background:var(--bg-input);color:var(--text);padding:10px 18px;border-radius:10px;box-shadow:var(--shadow);border:1px solid var(--border);font-size:14px;z-index:200;opacity:0;pointer-events:none;transition:opacity .25s,transform .25s}#toast.show{opacity:1;transform:translate(-50%) translateY(-6px)}@media(max-width:720px){.layout{height:100dvh}.menu-btn{display:flex}.topbar{padding:0 12px}.topbar-title{margin-right:auto}.sidebar{position:fixed;top:0;left:0;bottom:0;width:264px;z-index:150;transform:translate(-100%);transition:transform .25s ease}body.menu-open .sidebar{transform:translate(0)}.sidebar-overlay{display:block;opacity:0;pointer-events:none;transition:opacity .25s}body.menu-open .sidebar-overlay{opacity:1;pointer-events:auto}.sidebar .conv-title,.sidebar .new-chat-btn span,.sidebar .brand-name{display:block}.sidebar .brand{justify-content:flex-start;padding:16px 14px 8px}.sidebar .new-chat-btn{padding:10px 14px}.conv-item:active{background:var(--bg-hover)}.empty-state{padding-top:12vh}.empty-state h1{font-size:26px}.messages{padding:16px 12px 30px}.msg-content{max-width:100%}.msg-text{font-size:15px}.msg-image{max-width:100%;max-height:300px}.composer{padding:6px 10px calc(10px + env(safe-area-inset-bottom,0px))}.composer-box{border-radius:20px}.hint{font-size:11px;margin-top:8px}.img-download,.img-edit{opacity:1}.modal{width:100%;max-width:none;max-height:100dvh;height:100dvh;border-radius:0}.modal-header{padding:calc(16px + env(safe-area-inset-top,0px)) 18px 0}.modal-body{padding:14px 18px 4px}.modal-footer{padding:12px 18px calc(14px + env(safe-area-inset-bottom,0px))}}