.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:12px 24px;font-family:var(--font-family-primary);font-size:var(--font-size-base);font-weight:var(--font-weight-medium);line-height:1.5;text-align:center;text-decoration:none;white-space:nowrap;vertical-align:middle;cursor:pointer;user-select:none;border:1px solid transparent;border-radius:var(--border-radius-md);transition:all var(--transition-fast);outline:0}.btn.disabled,.btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.btn-primary{color:#fff;background-color:var(--color-primary);border-color:var(--color-primary);box-shadow:var(--shadow-sm)}.btn-primary:hover{background-color:var(--color-primary-dark);border-color:var(--color-primary-dark);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-primary:active{background-color:var(--color-primary-dark);box-shadow:var(--shadow-sm);transform:translateY(0)}.btn-success{color:#fff;background-color:var(--color-success);border-color:var(--color-success);box-shadow:var(--shadow-sm)}.btn-success:hover{background-color:var(--color-success-dark);border-color:var(--color-success-dark);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-danger{color:#fff;background-color:var(--color-error);border-color:var(--color-error);box-shadow:var(--shadow-sm)}.btn-danger:hover{background-color:var(--color-error-dark);border-color:var(--color-error-dark);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-warning{color:#fff;background-color:var(--color-warning);border-color:var(--color-warning);box-shadow:var(--shadow-sm)}.btn-warning:hover{background-color:var(--color-warning-dark);border-color:var(--color-warning-dark);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-secondary{color:var(--color-primary);background-color:transparent;border-color:var(--color-primary)}.btn-secondary:hover{color:#fff;background-color:var(--color-primary);border-color:var(--color-primary);transform:translateY(-1px)}.btn-secondary:active{transform:translateY(0)}.btn-secondary-success{color:var(--color-success);border-color:var(--color-success)}.btn-secondary-success:hover{color:#fff;background-color:var(--color-success)}.btn-secondary-danger{color:var(--color-error);border-color:var(--color-error)}.btn-secondary-danger:hover{color:#fff;background-color:var(--color-error)}.btn-tertiary{color:var(--color-primary);background-color:transparent;border-color:transparent}.btn-tertiary:hover{background-color:var(--color-primary-alpha-10)}.btn-tertiary:active{background-color:var(--color-primary-alpha-20)}.btn-tertiary-gray{color:var(--color-text-secondary)}.btn-tertiary-gray:hover{color:var(--color-text-primary);background-color:var(--color-gray-100)}.btn-tertiary-danger{color:var(--color-error)}.btn-tertiary-danger:hover{background-color:var(--color-error-light)}.btn-ghost{color:var(--color-text-primary);background-color:transparent;border-color:transparent}.btn-ghost:hover{background-color:var(--color-gray-100)}.btn-ghost:active{background-color:var(--color-gray-200)}.btn-xs{padding:4px 12px;font-size:var(--font-size-xs);border-radius:var(--border-radius-sm)}.btn-sm{padding:8px 16px;font-size:var(--font-size-sm)}.btn-md{padding:12px 24px;font-size:var(--font-size-base)}.btn-lg{padding:16px 32px;font-size:var(--font-size-lg);border-radius:var(--border-radius-lg)}.btn-xl{padding:20px 40px;font-size:var(--font-size-xl);border-radius:var(--border-radius-lg)}.btn-block{display:flex;width:100%}.btn-rounded{border-radius:var(--border-radius-full)}.btn-square{border-radius:0}.btn-circle{width:40px;height:40px;padding:0;border-radius:var(--border-radius-full)}.btn-circle.btn-sm{width:32px;height:32px}.btn-circle.btn-lg{width:48px;height:48px}.btn-group{display:inline-flex;gap:var(--spacing-xs)}.btn-group-vertical{display:inline-flex;flex-direction:column;gap:var(--spacing-xs)}.btn-group-connected{gap:0}.btn-group-connected .btn:not(:first-child){border-top-left-radius:0;border-bottom-left-radius:0;margin-left:-1px}.btn-group-connected .btn:not(:last-child){border-top-right-radius:0;border-bottom-right-radius:0}.btn-icon{display:inline-flex;align-items:center;gap:var(--spacing-sm)}.btn-icon-only{padding:12px}.btn-icon-left i,.btn-icon-left svg{margin-right:var(--spacing-xs)}.btn-icon-right i,.btn-icon-right svg{margin-left:var(--spacing-xs)}.btn i,.btn svg{width:18px;height:18px;flex-shrink:0}.btn-loading{position:relative;color:transparent!important;pointer-events:none}.btn-loading::after{content:'';position:absolute;width:16px;height:16px;top:50%;left:50%;margin-left:-8px;margin-top:-8px;border:2px solid transparent;border-top-color:currentColor;border-radius:50%;animation:.6s linear infinite btn-spin;color:#fff}.btn-secondary.btn-loading::after,.btn-tertiary.btn-loading::after{color:var(--color-primary)}@keyframes btn-spin{to{transform:rotate(360deg)}}.btn-fab{position:fixed;bottom:24px;right:24px;width:56px;height:56px;padding:0;border-radius:var(--border-radius-full);box-shadow:var(--shadow-lg);z-index:var(--z-fixed)}.btn-fab:hover{box-shadow:var(--shadow-xl);transform:scale(1.1)}.btn-fab-extended{width:auto;padding:0 24px}.btn-google{color:#fff;background-color:#db4437;border-color:#db4437}.btn-google:hover{background-color:#c53929;border-color:#c53929}.btn-facebook{color:#fff;background-color:#4267b2;border-color:#4267b2}.btn-facebook:hover{background-color:#365899;border-color:#365899}.btn-apple{color:#fff;background-color:#000;border-color:#000}.btn-apple:hover{background-color:#1a1a1a;border-color:#1a1a1a}@media (max-width:576px){.btn-responsive{width:100%;display:flex}.btn-fab{bottom:16px;right:16px}}[data-theme=dark] .btn-ghost{color:var(--color-text-primary)}[data-theme=dark] .btn-ghost:hover{background-color:var(--color-gray-800)}[data-theme=dark] .btn-tertiary-gray{color:var(--color-text-secondary)}[data-theme=dark] .btn-tertiary-gray:hover{color:var(--color-text-primary);background-color:var(--color-gray-800)}.btn:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}@media (prefers-reduced-motion:reduce){.btn{transition:none}.btn:hover{transform:none}}