:root{--bg: #ffffff;--surface: #ffffff;--surface-muted: #fafafa;--surface-subtle: #f5f5f5;--text: #1a1a1a;--text-muted: #5d6166;--text-faint: #8a8e93;--border: #d8dadd;--border-strong: #b8bcc1;--border-subtle: #ececec;--accent: #3F51B5;--accent-hover: #5C6BC0;--accent-fg: #ffffff;--link: #1565c0;--success: #2e7d32;--warning: #ef6c00;--error: #b71c1c;--success-bg: #e8f5e9;--warning-bg: #fff3e0;--error-bg: #ffebee;--input-bg: #ffffff;--input-text: #1a1a1a;--input-border: #c8ccd0;color-scheme:light}[data-theme=dark]{--bg: #15171a;--surface: #1f2226;--surface-muted: #1a1d20;--surface-subtle: #262a2f;--text: #ececec;--text-muted: #a8acb0;--text-faint: #6a6e72;--border: #383d43;--border-strong: #50565d;--border-subtle: #2a2e33;--accent: #7b8cdc;--accent-hover: #95a3e3;--accent-fg: #0e1014;--link: #6ab0f5;--success: #7ed089;--warning: #ffac5a;--error: #ff7a7a;--success-bg: #1f3322;--warning-bg: #3a2a17;--error-bg: #3a1c1c;--input-bg: #2a2e33;--input-text: #ececec;--input-border: 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14px}.app-sidebar.is-open{transform:translate(0)}.sidebar-toggle{display:none}.app-backdrop.is-open{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:150;cursor:pointer}.app-mobile-nav{display:flex;align-items:center;gap:12px;padding:10px 14px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.app-main{padding:16px}}@keyframes blink{0%,50%{opacity:1}51%,to{opacity:0}}.ai-coach-rail{flex-shrink:0;width:48px;background:var(--surface-muted);border-left:1px solid var(--border);display:flex;flex-direction:column;align-items:center;justify-content:flex-start;padding:14px 0;gap:8px;height:100%;box-sizing:border-box;cursor:pointer;border-top:0;border-right:0;border-bottom:0;font:inherit;color:var(--text);transition:background-color 80ms 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