:root{--bg: #e8e8e8;--header-bg: #3c3c3c;--bubble-left: #fff;--text: #1a1a1a;--muted: #666;--card-border: #e5e5e5;--error-bg: #fff5f5;--error-border: #feb2b2}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}#app{min-height:100vh}.page{max-width:520px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;background:var(--bg)}.header{background:var(--header-bg);color:#fff;padding:14px 16px 12px;text-align:center;flex-shrink:0}.header-title{font-size:17px;font-weight:600;letter-spacing:.02em}.header-sub{font-size:12px;opacity:.75;margin-top:2px}.chat{flex:1;padding:16px 12px 32px;overflow-y:auto}.date-chip{text-align:center;font-size:12px;color:#999;margin-bottom:16px}.row{display:flex;gap:8px;margin-bottom:18px;align-items:flex-end}.row-follow{margin-top:-6px}.avatar{width:40px;height:40px;border-radius:6px;background:#07c160;color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;flex-shrink:0}.col{max-width:calc(100% - 52px);min-width:0}.meta{display:flex;align-items:center;gap:8px;margin-bottom:4px;font-size:12px;color:var(--muted)}.name{color:#888}.time{color:#aaa}.bubble{border-radius:8px;padding:10px 12px;font-size:15px;line-height:1.45;word-break:break-word}.bubble-left{background:var(--bubble-left);border:1px solid #e0e0e0;box-shadow:0 1px 2px #0000000a}.hint{margin:0 0 10px;color:var(--muted);font-size:14px}.bubble-text-only{padding-top:8px;padding-bottom:8px}.hint-standalone{margin:0}.card{display:flex;gap:10px;align-items:flex-start;padding:12px;border:1px solid var(--card-border);border-radius:8px;background:#fafafa}.card-error{background:var(--error-bg);border-color:var(--error-border)}.card-icon{width:44px;height:44px;border-radius:8px;background:#1890ff;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}.card-icon.file{background:linear-gradient(135deg,#4a90d9,#357abd);position:relative}.card-icon.file:after{content:"";position:absolute;top:10px;right:8px;bottom:10px;left:8px;border:2px solid rgba(255,255,255,.9);border-radius:2px;border-top-width:6px}.card-body{flex:1;min-width:0}.card-title{font-weight:600;font-size:15px;margin-bottom:4px}.card-desc{margin:0 0 10px;font-size:12px;color:var(--muted);word-break:break-all}.btn{display:inline-block;width:100%;padding:10px 14px;border:none;border-radius:6px;background:#07c160;color:#fff;font-size:15px;font-weight:600;cursor:pointer}.btn:active{opacity:.9}.btn:disabled{opacity:.65;cursor:not-allowed}.btn-secondary{margin-top:8px;background:#fff;color:#07c160;border:1px solid #07c160}.btn-secondary:active{background:#f0fff4}.hint-multiline{white-space:pre-line}.download-err{margin:8px 0 0;font-size:13px;color:#c53030}.meta-hint{margin:0 0 8px;font-size:13px;color:#b7791f}.card-warn{margin:0 0 8px;font-size:13px;color:#c05621;line-height:1.4}