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var(--bv-color-border);border-radius:var(--bv-radius-md);background:var(--bv-color-surface);color:var(--bv-color-primary);font-family:var(--bv-font-heading);font-size:var(--bv-fs-md);font-weight:600;font-variant-numeric:lining-nums;line-height:1.2;text-decoration:none;cursor:pointer;transition:background .12s ease,border-color .12s ease,color .12s ease,box-shadow .12s ease}.bv-btn:hover:not(:disabled){border-color:var(--bv-color-primary);background:var(--bv-color-primary-soft)}.bv-btn:disabled{opacity:.45;cursor:not-allowed}.bv-btn--primary{border-color:var(--bv-color-primary);background:var(--bv-color-primary);color:var(--bv-color-on-fill)}.bv-btn--primary:hover:not(:disabled){border-color:var(--bv-color-primary-strong);background:var(--bv-color-primary-strong)}.bv-btn--accent{border-color:var(--bv-color-accent-strong);background:var(--bv-color-accent-strong);color:var(--bv-color-on-fill)}.bv-btn--accent:hover:not(:disabled){border-color:var(--bv-color-accent-strong);background:color-mix(in srgb,var(--bv-color-accent-strong) 88%,#000)}.bv-btn--ghost{border-color:transparent;background:transparent;padding-inline:var(--bv-space-3)}.bv-btn .bv-icon{flex:none}.bv-back-link{display:inline-flex;align-items:center;gap:var(--bv-space-1);color:var(--bv-color-muted);font-size:var(--bv-fs-sm);text-decoration:none}.bv-back-link:hover{color:var(--bv-color-primary);text-decoration:underline}@media (prefers-reduced-motion: reduce){*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important;scroll-behavior:auto!important}}.bv-session{max-width:var(--bv-width-reading);margin:0 auto;padding:var(--bv-space-6) var(--bv-gutter) var(--bv-space-10)}.bv-session__header{margin:var(--bv-space-3) 0 var(--bv-space-5)}.bv-session__kicker{display:flex;align-items:center;gap:var(--bv-space-2);margin:0 0 var(--bv-space-1);color:var(--bv-color-accent-strong);font-family:var(--bv-font-heading);font-size:var(--bv-fs-xs);font-weight:700;font-variant-numeric:lining-nums;letter-spacing:.08em;text-transform:uppercase}.bv-session__title{margin:0;color:var(--bv-color-primary);font-family:var(--bv-font-heading);font-size:clamp(1.25rem,3.5vw,1.625rem);font-weight:700}.bv-session-card,.bv-card{background:var(--bv-color-surface);border:1px solid var(--bv-color-border-soft);border-radius:var(--bv-radius-lg);box-shadow:var(--bv-shadow-sm);padding:clamp(var(--bv-space-4),4vw,var(--bv-space-8))}.bv-progress{margin:0 0 var(--bv-space-4)}.bv-progress__label{margin:0 0 var(--bv-space-2);color:var(--bv-color-muted);font-family:var(--bv-font-body);font-size:var(--bv-fs-sm)}.bv-progress__track{height:.375rem;border-radius:var(--bv-radius-pill);background:var(--bv-color-border-soft);overflow:hidden}.bv-progress__bar{height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--bv-color-primary),var(--bv-color-accent));transition:width .24s ease}.bv-session__nav{display:flex;align-items:center;gap:var(--bv-space-3);margin-top:var(--bv-space-5)}.bv-session__nav-spacer{flex:1}.bv-session--empty{text-align:center;padding-top:var(--bv-space-12)}.bv-session--empty h1{margin:0 0 var(--bv-space-3);color:var(--bv-color-primary);font-size:var(--bv-fs-xl)}.bv-session--empty p{margin:0 0 var(--bv-space-6);color:var(--bv-color-muted)}.bv-session__loading{padding:var(--bv-space-12) var(--bv-gutter);color:var(--bv-color-muted);font-family:var(--bv-font-body);text-align:center}