:root{--bk-surface: rgba(8, 20, 34, .46);--bk-surface-2: rgba(255, 255, 255, .06);--bk-border: rgba(255, 255, 255, .14);--bk-border-hot: rgba(4, 157, 240, .65);--bk-text: #f6fbfe;--bk-text-muted: rgba(246, 251, 254, .72);--bk-text-dim: rgba(246, 251, 254, .45);--bk-slot-open: #38d39f;--bk-slot-tight: #f7b500;--bk-slot-full: rgba(255, 255, 255, .12);--bk-r-sm: 10px;--bk-r-md: 16px;--bk-r-lg: 24px;--bk-r-pill: 999px;--bk-ease: cubic-bezier(.22, .61, .36, 1);--bk-dur-fast: .15s;--bk-dur-base: .24s;--bk-dur-slow: .4s;--co-state-pending: #f7b500;--co-state-done: #38d39f;--co-state-future: rgba(246, 251, 254, .35);--co-toast-bg: rgba(8, 20, 34, .95);--co-toast-border: rgba(255, 255, 255, .18);--co-toast-shadow: 0 12px 32px rgba(0, 0, 0, .45);--co-tab-bg: rgba(8, 20, 34, 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8px}.co-error-copy{color:var(--bk-text-muted);font-size:.95rem;margin:0 0 20px;max-width:320px}.co-error-btn{padding:12px 24px;background:transparent;border:1px solid var(--bk-border);color:var(--bk-text);border-radius:var(--bk-r-pill);font-weight:700;cursor:pointer;text-decoration:none;display:inline-block}.coach-shell{max-width:720px;margin:0 auto;padding:0 16px calc(24px + env(safe-area-inset-bottom));min-height:100vh}.bk-topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;height:56px;padding-top:env(safe-area-inset-top);margin:0 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var(--bk-border);color:var(--bk-text)}.co-lesson-code{color:var(--bk-text-muted);opacity:.75;font-size:.72rem;overflow:hidden;text-overflow:ellipsis}.co-lesson-badge{width:26px;height:26px;border-radius:var(--bk-r-pill);display:inline-flex;align-items:center;justify-content:center;font-size:.82rem;font-weight:800;flex-shrink:0}.co-lesson-badge.is-pending{background:#f7b5002e;border:1px solid var(--co-state-pending);color:var(--co-state-pending)}.co-lesson-badge.is-done{background:#38d39f2e;border:1px solid var(--co-state-done);color:var(--co-state-done)}.co-lesson-badge.is-future{background:transparent;color:var(--co-state-future)}.co-report-filter{display:inline-flex;gap:4px;padding:4px;margin:14px 0 4px;border-radius:var(--bk-r-pill);background:var(--bk-surface);border:1px solid var(--bk-border)}.co-report-filter-btn{padding:7px 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