:root{--bg: #f6f7fb;--panel: #ffffff;--card: #ffffff;--accent: #2f80ed;--text: #1f2a44;--muted: #5f6b85;--border: #d9deeb}*{box-sizing:border-box}*{scrollbar-width:thin;scrollbar-color:rgba(31,42,68,.25) transparent}*::-webkit-scrollbar{width:6px;height:6px}*::-webkit-scrollbar-track{background:transparent}*::-webkit-scrollbar-thumb{background:#1f2a4447;border-radius:6px}*::-webkit-scrollbar-thumb:hover{background:#1f2a446b}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);overflow:hidden;min-height:100vh}#root{min-height:100vh;height:100vh}.app{display:grid;grid-template-columns:320px 1fr;height:100vh;min-height:100vh}.sidebar{background:var(--panel);padding:20px;border-right:1px solid var(--border);display:flex;flex-direction:column;gap:12px;height:100vh;box-sizing:border-box}.sidebar-head{display:flex;align-items:center;justify-content:space-between;font-size:12px}.session-list{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;display:flex;flex-direction:column;align-content:flex-start;gap:8px}.sidebar-footer{margin-top:auto;padding:10px 8px 0;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--muted)}.user-chip{display:flex;align-items:center;gap:8px;position:relative;padding:6px 8px;border-radius:12px;background:transparent;width:100%;justify-content:center;text-align:center;border:none;box-shadow:none;align-self:center;margin:0 auto;cursor:default}.avatar-circle{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;box-shadow:0 6px 16px 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var(--border)}.user-msg-content{white-space:pre-wrap;color:var(--text)}.podcast-pane{display:flex;flex-direction:column;gap:12px;height:100%;flex:1;overflow:hidden}.podcast-body{display:grid;grid-template-columns:260px 1fr;gap:14px;height:100%;min-height:0}.history-pane{background:#fff;border:1px solid #e4e7f0;border-radius:12px;padding:12px;display:flex;flex-direction:column;gap:10px;min-height:0;box-shadow:0 12px 32px #0000000d}.history-header{display:flex;align-items:center;justify-content:space-between;font-weight:600;position:sticky;top:0;background:#fff;padding-bottom:6px;border-bottom:1px solid #eef1f8;z-index:2}.history-list{flex:1;min-height:0;overflow-y:auto;display:flex;flex-direction:column;gap:8px;padding-top:16px;scroll-padding-top:16px}.history-item{padding:10px;border:1px solid #e7ebf5;border-radius:10px;background:#f9fbff;display:flex;align-items:center;justify-content:space-between;gap:8px;cursor:pointer;transition:box-shadow .12s ease,transform .08s ease,border-color 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