:root{--color-primary-50:#E6FBF7;--color-primary-100:#C5F4EC;--color-primary-200:#93E9DB;--color-primary-300:#57D8C5;--color-primary-400:#1FC2AC;--color-primary-500:#00BFA5;--color-primary-600:#00A78F;--color-primary-700:#007E71;--color-primary-800:#006B5F;--color-primary-900:#04463F;--color-secondary-50:#EEF3FF;--color-secondary-100:#DBE5FF;--color-secondary-200:#B9CCFF;--color-secondary-300:#8CADFF;--color-secondary-400:#5B85FB;--color-secondary-500:#3B6EF6;--color-secondary-600:#2F5BE0;--color-secondary-700:#2454D6;--color-secondary-800:#1E3FB4;--color-secondary-900:#1B2F70;--color-neutral-0:#FFFFFF;--color-neutral-50:#F7F8FA;--color-neutral-100:#F0F2F5;--color-neutral-200:#E4E7EC;--color-neutral-300:#D0D5DD;--color-neutral-400:#98A2B3;--color-neutral-500:#667085;--color-neutral-600:#475467;--color-neutral-700:#344054;--color-neutral-800:#1D2939;--color-neutral-900:#101828;--color-success-50:#E8F8F0;--color-success-500:#12B76A;--color-warning-50:#FEF4E6;--color-warning-100:#FCE3BF;--color-warning-500:#F79009;--color-warning-glow:rgba(247,144,9,0.16);--color-error-50:#FEECEC;--color-error-500:#F04438;--color-info-50:#EEF3FF;--color-info-500:#3B6EF6;--color-ai-500:#6D5DF6;--color-vip-gold:#FDB022;--color-bg:#FFFFFF;--color-bg-subtle:#F7F8FA;--color-bg-muted:#F0F2F5;--color-surface:#FFFFFF;--color-surface-hover:#FAFBFC;--color-border:#E4E7EC;--color-border-strong:#D0D5DD;--color-overlay:rgba(16,24,40,0.55);--color-overlay-soft:rgba(16,24,40,0.32);--color-text:#101828;--color-text-secondary:#475467;--color-text-tertiary:#667085;--color-text-on-primary:#FFFFFF;--color-text-on-secondary:#FFFFFF;--font-family-base:"Be 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var(--color-primary-500);outline-offset:2px}.btn:disabled,.btn[aria-disabled=true]{opacity:.45;pointer-events:none}.btn--primary{background:var(--color-primary-700);color:var(--color-text-on-primary)}.btn--primary:hover{background:var(--color-primary-800)}.btn--secondary{background:var(--color-secondary-700);color:var(--color-text-on-secondary)}.btn--secondary:hover{background:var(--color-secondary-800)}.btn--outline{background:transparent;color:var(--color-primary-700);border-color:var(--color-primary-200)}.btn--outline:hover{background:var(--color-primary-50)}.btn--ghost{background:transparent;color:var(--color-primary-700)}.btn--ghost:hover{background:var(--color-primary-50)}.btn--neutral{background:var(--color-neutral-100);color:var(--color-neutral-800)}.btn--neutral:hover{background:var(--color-neutral-200)}.btn--vip{color:var(--color-text-on-primary)}.btn--vip,.btn--vip:hover{background:linear-gradient(135deg,var(--color-warning-500),var(--color-vip-gold))}.btn--vip:hover{filter:brightness(1.03)}.btn--ai{background:var(--color-secondary-50);color:var(--color-secondary-700);border-color:var(--color-secondary-200)}.btn--ai:hover{background:var(--color-secondary-100)}.btn--sm{padding:9px 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#fff;background:var(--color-success-500)}.avatar__status--offline{background:var(--color-neutral-400)}.course-card{display:flex;flex-direction:column;gap:var(--space-3)}.course-card__thumb{position:relative;width:100%;height:150px;border-radius:var(--radius-md);background:var(--color-primary-50);display:flex;align-items:center;justify-content:center;overflow:hidden}.course-card__thumb img{width:100%;height:100%;-o-object-fit:cover;object-fit:cover}.course-card__thumb 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